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Sonntag, 22. März 2015 - 21:30 Uhr

Astronomie - Partielle SoFi über Mitteleuropa am Freitag, 20.März

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14.03.2015

ESA´S MINISATELLITEN BEOBACHTEN SOFI

On Friday morning, 20 March, Europe will experience a partial solar eclipse. Only a partial solar eclipse will be visible from continental Europe, but the Agency’s Sun-watching Proba-2 minisatellite, up in its 820 km-altitude orbit, will see two periods of near-total eclipse for a few dozen seconds.
Meanwhile, other members of ESA’s Proba minisatellite family – each smaller than a cubic metre – will be looking downwards, attempting to capture views of the Moon’s shadow as it crosses Earth.
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Proba-2
The media and general public are invited to ESA’s technical heart in the Netherlands on the day to experience this spectacular event from both Earth and space. An event is being organised by ESA’s centre and its Space Expo visitor centre in Noordwijk to observe the eclipse safely with telescopes and share views of the Sun, Moon and Earth from orbit.
As observed from Space Expo, the partial solar eclipse will begin at 0930 CET on Friday 20 March, when the edge of the Moon first intrudes into the solar disc, with the maximum four-fifths of the Sun being covered by 10:37 CET and the eclipse concluding at 11:48 CET.
During a solar eclipse the Moon moves in front of the Sun as seen from Earth. As their apparent size is similar, the Moon temporarily blocks a significant part of the Sun’s light.
The whole of Europe will experience a partial solar eclipse this time: 100% of the Sun’s disc will be obscured over Norway’s Svalbard islands, 97% from the north of Scotland, 84% over London, 81% over The Hague, 75% over Paris, 65% over Madrid and 56% over Rome.
The path of ‘totality’ next Friday – where the Sun is completely blocked – will trace a small band across the North Atlantic, including the Faroe Islands and Svalbard, the latter home to an ESA ground station from where eclipse images will be broadcast.
During totality the Sun appears to have a wispy white halo, offering ground observers a rare direct view of its atmosphere or ‘corona’, normally kept out of sight by the intense brightness of the solar disc.
Please take care if you are fortunate enough to be watching this event: observing the Sun with the naked eye is extremely dangerous and can lead to permanent blindness. Please use certified equipment such as solar eclipse glasses, or a solar telescope under expert guidance.
Quelle: ESA
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Eine partielle Sonnenfinsternis über Mitteleuropa
Über Norddeutschland wird die partielle Sonnenfinsternis vom 20. März 2015 gegen 10:45 Uhr MEZ einen Bedeckungsgrad von rund 80 Prozent erreichen, im Süden sind immerhin noch rund 70 Prozent des Tagesgestirns von der dunklen Scheibe des Neumonds bedeckt. Auf den Färöer-Inseln, auf Spitzbergen und sogar am Nordpol ist die Finsternis für rund zwei Minuten total.
Wer eine Reise auf die Färöer-Inseln oder nach Spitzbergen wagt, der könnte am 20. März 2015 in den Genuss des seltenen Anblicks der Sonnenkorona kommen, denn dort im hohen Norden ist diese Sonnenfinsternis total. Aber wegen des niedrigen Sonnenstands und wolkenreichen Klimas mag man dort auch nur Zeuge einer plötzlich eintretenden, gut zwei Minuten anhaltenden Dunkelheit werden. Wer keine Reise in diese abgelegen Regionen plant, kann die totale Finsternis dennoch live verfolgen. Das Slooh Community Observatory plant, die Finsternis von den Färöer-Inseln zu übertragen.
Partielle Sonnenfinsternis
Am 20. März 2015 wird die Sonne über Norddeutschland zu rund 80 Prozent vom Mond bedeckt, über dem Alpenraum zu gut 65 Prozent.
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Die totale Sonnenfinsternis vom 20. März 2015
Der Verlauf der totalen Sonnenfinsternis vom 20. März 2015 über der Nordhalbkugel der Erde. Im deutschen Sprachraum beträgt der maximale Grad der Verfinsterung rund 80 Prozent.
Sonnensichel, zackiger Mondrand und Fleckenbedeckungen
Da die Sonne derzeit recht aktiv ist, dürfen wir auf mehrere Fleckengruppen hoffen, darunter vielleicht auch einige kräftige Flecken mit großer Penumbra. So darf mit mehreren Bedeckungen von großen Flecken durch den dunklen, bei genauerem Hinsehen etwas unregelmäßigen Mondrand gerechnet werden. Am besten beobachten Sie dies mit einem gut gegen Streulicht abgeschirmten Projektionsschirm oder einem Objektivsonnenfilter. Okularfilter sind dagegen sehr gefährlich und platzen bei längerer Beobachtung durch die anhaltende Erhitzung im konzentrierten Sonnenlicht.
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Quelle: Spektrum.de
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Update: 15.03.2015
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UK skies set to dim in decade’s deepest solar eclipse

On 20 March a total eclipse of the Sun will take place, visible from the North Atlantic Ocean. Observers in the UK and Ireland will see a partial solar eclipse, with up to 97% of the Sun blocked out. This will be the deepest eclipse in the UK since 1999 and until 2026.
Total solar eclipses take place when the Earth, Moon and Sun are almost precisely aligned and the shadow of the Moon touches the surface of the Earth. At mid-eclipse, observers within the lunar shadow briefly see totality, where the silhouette of the Moon completely covers the Sun, revealing the beautiful outer solar atmosphere or corona. Totality is visible this time along a track a few hundred kilometres wide, which only intersects two landmasses, the Faroe Islands midway between Scotland and Iceland, and the arctic archipelago of Svalbard. Observers in those locations will see between two and two-and-a-half minutes of totality.
Away from the path of the total eclipse the Sun is only partly obscured by the Moon. This time the partial eclipse is visible across a large part of the northern hemisphere, including the whole of Europe, Greenland, Newfoundland, northern Africa and western Asia.
In London the partial phase of the eclipse begins at 08:25 GMT. Maximum eclipse is at 09:31 GMT when 85% of the Sun will be blocked. The eclipse ends at 10:41 GMT. Further north in the British Isles, observers enjoy an even better view. From Edinburgh 93% of the Sun will be covered and from Lerwick in the Shetland Isles, the Moon will obscure 97% of the solar disk.
Although eclipses of the Sun are spectacular events, they should NOT be viewed with the unaided eye except during the brief period of totality, which this time will not be visible anywhere in the UK. Despite a large part of the solar disk being covered, looking at the partially eclipsed Sun without appropriate protection can cause serious and permanent damage to the eyes.
The Royal Astronomical Society is backing the stance of Public Health England and the Royal College of Ophthalmologists, who are warning about the risk of eye damage from looking at the Sun. With the Society for Popular Astronomy (SPA), the RAS has produced a booklet on how to safely view the eclipse that suggests a number of ways to project the solar image rather than looking at the Sun directly.
On the morning of 20 March, amateur astronomical societies and public observatories will be running events where members of the public can safely enjoy the eclipse. The RAS and the Baker Street Irregular Astronomers (BSIA) will be running a joint (free) event in Regent’s Park, central London, where members of the public can come and view the eclipse using appropriate equipment at no cost.
Quelle: The Royal Astronomical Society (RAS)
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Update: 17.03.2015 
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Quelle: SC
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Update: 19.03.2015
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Spring Solar Eclipse Visible In Europe on March 20
March 19, 2015
Editor's note: NASA won't have its own live feed of the event, but our friends at Slooh will be webcasting the March 20 solar eclipse live beginning at 4:30 a.m. EDT.
During the morning of March 20, 2015, a total solar eclipse will be visible from the Faroe Islands, located northwest of Scotland, and the Svalbard Islands, located east of Greenland. At the same time, surrounding regions of Europe, northern Africa and northern Asia will be treated to a partial solar eclipse.
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This sketch by Spanish astronomer José Joaquin de Ferrer, depicts the solar atmosphere, or corona, during a June 16, 1806, total solar eclipse. Before astronomical photography, observers depended on sketches of eclipses to study the sun's corona.
Image Credit: José Joaquin de Ferrer
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A solar eclipse occurs when the moon passes between Earth and the sun, casting a shadow over Earth. The moon’s shadow masks the solar surface and blocks sunlight from reaching Earth directly – but the amount of sunlight blocked depends on location. For example, on March 20, those in Glasgow, Scotland, will see about 94-percent of the sun blocked by the moon. The unblocked sunlight will appear as a thumbnail sliver. In Paris, the moon will block about three-quarters of the sun at the time of maximum eclipse.
Not only are eclipses an engaging sight, but they also have provided a slew of important science results through the ages. Total solar eclipses block the entire disk of the sun so the faint solar corona, the sun's atmosphere, can be seen.  In fact, before the 20th century, eclipses were the only way humans could see the corona.
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The animated image shows the path of the March 20, 2015 solar eclipse. The blue, half-oval, shadow shows the regions where a partial eclipse will be visible. The thin black line shows the area of total eclipse.
Image Credit: NASA
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Records of ancient solar eclipse observations date back to around 2,000 B.C. Before astronomical photography, astronomers and talented recorders drew solar details of eclipses. This gave observers only a few minutes to sketch the sun’s corona, before the total eclipse was over – but the results led to tantalizing glimpses of how variable and dynamic that atmosphere was exciting the curiosity of early scientists.
Given the advantages of using solar eclipses to study the solar atmosphere, scientists and engineers in the 20th century built telescopes and spacecraft to mimic their effects. Known as coronagraphs, these kinds of observatories artificially block out the bright light of the sun to reveal the surrounding corona. Today, scientists gather observations from such coronagraphs as the joint European Space Agency and NASA’s Solar and Heliospheric Observatory, or SOHO, as well as NASA's Solar Terrestrial Relations Observatory, or STEREO.  For example, these artificial eclipse-makers help us spot and measure giant eruptions on the sun called coronal mass ejections, or CMEs, that hurl solar material out into space.
Solar eclipses have also helped with physics and chemistry research. A total solar eclipse proved Einstein’s theory of general relativity. According to the theory, light from a star should appear to bend as it passes by the edge of the sun. Observations during a total solar eclipse in 1919 – which blocked enough of the sun's light that stars near the sun were visible in the daytime – showed a star’s apparent position in the sky shift due to the sun’s gravitational influence, thus confirming Einstein’s theory.
Additionally, solar eclipse observations led to the discoveries of new and unexpected elements. Spectroscopy measures light emitted, absorbed or scattered by materials.  Therefore, examining spectroscopic data can show what materials gave off or blocked incoming light, making it a great tool for exploring materials in distant stars or other planets. Eclipse spectroscopy detected helium in 1868, 25 years before discovery of the element on Earth.
During a solar eclipse in 1879, two scientists independently discovered another new line in the spectrum of the sun’s corona. The data led the scientists to believe they’d discovered a new element. They named the element coronium. Six decades later an astronomer realized coronium lines weren’t unique, but rather they depicted iron at very high temperatures.
"That incredibly hot iron led to an important area of solar science, called the coronal heating problem," said Ryan Milligan a solar scientist at Queen’s University Belfast in Northern Ireland. "The sun's atmosphere is much, much hotter than its surface and scientists are still trying to establish exactly why."
Despite modern technology, eclipses are still vital to observing and understanding the sun. Coronagraphs in space cannot show the inner corona of the sun, locations where scientists believe CME’s are accelerated. These regions are better viewed during a total solar eclipse.
In addition to research, present day eclipses are watched for their interest value. If you're able to see the March 20, 2015, eclipse, remember to never look at the sun with the naked eye, even during an eclipse.
Quelle: NASA
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Update: 23.03.2015
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Astronauts Snap Amazing Total Solar Eclipse Photos from Space

This image, taken by Samantha Cristoforetti on the space station may show the shadow of the moon on the Earth during a solar eclipse on March 20, 2015. 
Credit: Samantha Cristoforetti Twitter/ESA/NASA
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Astronauts on the International Space Station caught sight of an amazing solar eclipse today (March 20), and they have the photos to prove it.
European Space Agency astronaut Samantha Cristoforetti took a break from her experiments on the station today to take some great pictures of the total solar eclipse. She may have even gotten a good image of the moon's shadow (called an umbra) on Earth's surface.
"Took a peek out the window between experiments," Cristoforetti said in a series of posts on Twitter. "Orbital sunrise and the #SolarEclipse... could it go any better? … I think this is it: the umbra. Looking aft on our flightpath around maximum obscuration time. #SolarEclipse."NASA's Terry Virts — Cristoforetti's fellow crewmember on the orbiting outpost — also snapped a photo of the solar eclipse just as the sun rose above Earth's horizon.
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This photo, taken by ESA astronaut Samantha Cristoforetti on the International Space Station, shows a solar eclipse on March 20, 2015.
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"#Eclipse at 'first light,'" Virts wrote in a couple photo post on Twitter. "You can barely see the corner of the sun that the moon is hiding … There's definitely a piece of the sun missing!"
Only people in certain parts of the world could see the total solar eclipse of March 20 at its best. Skywatchers in Denmark's Faroe Islands and Norway's Svalbard Islands were in the path of totality along with other parts of the North Atlantic. Some intrepid stargazers even chartered flights to be able to see the total eclipse from the air.
Spacecraft in orbit were also able to capture amazing images of the cosmic event. The European Space Agency's Proba-2 caught a stunning video of the solar eclipse from space.
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NASA astronaut Terry Virts took this image of a solar eclipse on March 20, 2015. The moon appears to take a bite out of the sun as it comes above the horizon.
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Just as a reminder, it's not a good idea to stare directly at the sun, even during an eclipse. Skywatchers can build a pinhole camera or use special filters for binoculars to observe the eclipse. Eclipse glasses are relatively cheap and can also be used to safely view the sun.
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The total solar eclipse of 2015 is captured in this spectacular view webcast live by NRK News on March 20 from Norway's Svalbard archipelago in the Arctic Ocean.
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The total solar eclipse of 2015 shines at its best in this amazing view captured by Space.com skywatching columnist Joe Rao from an eclipse-chasing jet over the North Atlantic Ocean on March 20, 2015.
Quelle: SC


Tags: Astronomie 20.März 

1993 Views

Donnerstag, 19. März 2015 - 22:00 Uhr

Astronomie - SOFIA findet fehlende Verbindung zwischen Supernovae und Planetenentstehung

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SOFIA data reveal warm dust (white) surviving inside a supernova remnant. The SNR Sgr A East cloud is traced in X-rays (blue). Radio emission (red) shows expanding shock waves colliding with surrounding interstellar clouds (green).
Image Credit: NASA/CXO/Herschel/VLA/Lau et al
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Using NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA), an international scientific team discovered that supernovae are capable of producing a substantial amount of the material from which planets like Earth can form.
These findings are published in the March 19 online issue of Science magazine.
"Our observations reveal a particular cloud produced by a supernova explosion 10,000 years ago contains enough dust to make 7,000 Earths," said Ryan Lau of Cornell University in Ithaca, New York.
The research team, headed by Lau, used SOFIA's airborne telescope and the Faint Object InfraRed Camera for the SOFIA Telescope, FORCAST, to take detailed infrared images of an interstellar dust cloud known as Supernova Remnant Sagittarius A East, or SNR Sgr A East.
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Supernova remnant dust detected by SOFIA (yellow) survives away from the hottest X-ray gas (purple). The red ellipse outlines the supernova shock wave. The inset shows a magnified image of the dust (orange) and gas emission (cyan).
Image Credit: NASA/CXO/Lau et al
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The team used SOFIA data to estimate the total mass of dust in the cloud from the intensity of its emission. The investigation required measurements at long infrared wavelengths in order to peer through intervening interstellar clouds and detect the radiation emitted by the supernova dust.
Astronomers already had evidence that a supernova’s outward-moving shock wave can produce significant amounts of dust. Until now, a key question was whether the new soot- and sand-like dust particles would survive the subsequent inward “rebound” shock wave generated when the first, outward-moving shock wave collides with surrounding interstellar gas and dust.
"The dust survived the later onslaught of shock waves from the supernova explosion, and is now flowing into the interstellar medium where it can become part of the 'seed material' for new stars and planets," Lau explained.
These results also reveal the possibility that the vast amount of dust observed in distant young galaxies may have been made by supernova explosions of early massive stars, as no other known mechanism could have produced nearly as much dust.
"This discovery is a special feather in the cap for SOFIA, demonstrating how observations made within our own Milky Way galaxy can bear directly on our understanding of the evolution of galaxies billions of light years away," said Pamela Marcum, a SOFIA project scientist at Ames Research Center in Moffett Field, California.
SOFIA is a heavily modified Boeing 747 Special Performance jetliner that carries a telescope with an effective diameter of 100 inches (2.5 meters) at altitudes of 39,000 to 45,000 feet (12 to 14 km). SOFIA is a joint project of NASA and the German Aerospace Center. The aircraft observatory is based at NASA's Armstrong Flight Research Center facility in Palmdale, California. The agency’s Ames Research Center in Moffett Field, California, is home to the SOFIA Science Center, which is managed by NASA in cooperation with the Universities Space Research Association in Columbia, Maryland, and the German SOFIA Institute at the University of Stuttgart.
Quelle: NASA

Tags: Astronomie 

2011 Views

Donnerstag, 19. März 2015 - 09:22 Uhr

Raumfahrt - Erfolgreicher Test Flug für Mars Lande Technologie : Autonomous Descent and Ascent Powered-flight Testbed (ADAPT).

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The ADAPT test system can help a spacecraft divert its course and make a smooth, pinpoint landing. The system is built on Masten's XA-0.1B "Xombie" vertical-launch, vertical-landing reusable rocket. Credit: NASA Photo / Tom Tschida

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It's tricky to get a spacecraft to land exactly where you want. That's why the area where the Mars rover Curiosity team had targeted to land was an ellipse that may seem large, measuring 12 miles by 4 miles (20 by 7 kilometers).
Engineers at NASA's Jet Propulsion Laboratory in Pasadena, California, have been developing cutting-edge technologies that would enable spacecraft to land at a specific location on Mars -- or any other planetary body -- with more precision than ever before. In collaboration with Masten Space Systems in Mojave, California, they have recently tested these technologies on board a high-tech demonstration vehicle called the Autonomous Descent and Ascent Powered-flight Testbed (ADAPT).
ADAPT is a test system built on Masten's XA-0.1B "Xombie" vertical-launch, vertical-landing reusable rocket. The Xombie platform provides a good approximation of Mars-like descent conditions through high-speed descent rates at low altitudes. Those conditions are difficult to achieve through conventional flight test platforms. Onboard this rocket, two sophisticated lander technologies were recently tested: Terrain Relative Navigation with a sensor called the Lander Vision System (LVS), and the Guidance for Fuel-Optimal Large Diverts (G-FOLD) algorithm.
"No previous Mars lander has used onboard surface imaging to achieve a safe and precise touchdown, but a future spacecraft could use LVS and G-FOLD to first autonomously determine its location and then optimally fly to its intended landing site," said Nikolas Trawny, ADAPT's principal investigator at JPL. "All of this happens on board, without human intervention, and in real time."
ADAPT had two successful test flights, one on Dec. 4, 2014, and the second on Dec. 9. In both cases, the rocket reached a maximum altitude of 1,066 feet (325 meters) before beginning its descent.
The terrain-relative navigation capability provided by LVS allows Xombie to precisely determine its position without requiring GPS. To do so, ADAPT first takes a series of pictures of the terrain below it during descent. These pictures are then compared to an image of the terrain stored onboard, allowing the vehicle to autonomously find its position relative to the landing site. The spacecraft can then use this information to correct its course to get as close to the targeted landing site as possible within its capability, and make a smooth, pinpoint landing.
G-FOLD is an algorithm, developed at JPL and at the University of Texas at Austin, that calculates the optimal path to divert a spacecraft to a target landing site in real time. For the first time, G-FOLD allows onboard calculation of divert trajectories that obtain the maximum performance from every kilogram of propellant.
The combination of LVS and G-FOLD allowed the Xombie rocket to begin to change the course of its descent at about 623 feet (190 meters) in the air on December 9. The rocket then flew the newly calculated course to successfully reach the target landing pad located 984 feet (300 meters) to the east.
"This represents a huge step forward in our future capabilities for safe and precise Mars landing, and demonstrates a highly effective approach for rapid, low-cost validation of new technologies for the entry, descent and landing of spacecraft," said Chad Edwards, chief technologist of the Mars Exploration Directorate at JPL. "This same technology has valuable applications to landing on the moon, asteroids and other space targets of interest."
NASA's Space Technology Mission Directorate is facilitating the tests via its Flight Opportunities Program managed at NASA's Armstrong Flight Research Center at Edwards Air Force Base, California.
JPL, a division of the California Institute of Technology, Pasadena, manages the ADAPT project and funded the ADAPT payload development. The LVS prototype was designed, developed and tested by the Mars Technology Development program of NASA's Science Mission Directorate.
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On Dec. 9, 2014, the Xombie rocket carrying the ADAPT system reached a maximum altitude of 1,066 feet (325 meters) before beginning its descent. Credit: NASA Photo / Tom Tschida
The ADAPT technology has numerous potential applications, including landing on the moon, asteroids and other space targets of interest. Credit: NASA Photo / Tom Tschida
Quelle: NASA

Tags: Raumfahrt 

1993 Views

Donnerstag, 19. März 2015 - 08:51 Uhr

Raumfahrt - Start von Proton-M Rakete mit Ekspress-AM7 Satelliten auf Baikonur

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The spacecraft will separate from the upper stage at 10:18 a.m. Moscow time (0718 GMT)

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A Russian Proton-M rocket carrying the Ekspress-AM7 communications satellite has lifted off from the Baikonur cosmodrome in Kazakhstan, a director of communications at the Khrunichev state research and production space centre said on Thursday.
"The lift-off has taken place. The separation of the upper stage as part of the Briz-M booster and the Ekspress-AM7 spacecraft from the third stage of the Proton-M carrier rocket is expected in around 10 minutes," Alexander Shmygov said.
The spacecraft will separate from the upper stage at 10:18 a.m. Moscow time (0718 GMT). It will take the spacecraft a total of 9 hours and 13 minutes - from the lift-off to separation - to reach its final orbit.
Ekspress-AM7 is manufactured by European company Airbus DS under a contract with the Russian satellite communications company. The satellite is due to provide digital television and radio broadcasting, broadband access and multimedia, data transmission, telephone and mobile communications.
Quelle: TASS

Tags: Raumfahrt 

1777 Views

Mittwoch, 18. März 2015 - 21:30 Uhr

Mars-Chroniken - MAVEN erkennt Aurora und Mysteriöse Staubwolke um den Mars

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Artist’s conception of MAVEN’s Imaging UltraViolet Spectrograph (IUVS) observing the “Christmas Lights Aurora" on Mars. MAVEN observations show that aurora on Mars is similar to Earth’s "Northern Lights" but has a different origin.
Image Credit: University of Colorado
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NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft has observed two unexpected phenomena in the Martian atmosphere: an unexplained high-altitude dust cloud and aurora that reaches deep into the Martian atmosphere.
The presence of the dust at orbital altitudes from about 93 miles (150 kilometers) to 190 miles (300 kilometers) above the surface was not predicted. Although the source and composition of the dust are unknown, there is no hazard to MAVEN and other spacecraft orbiting Mars.
"If the dust originates from the atmosphere, this suggests we are missing some fundamental process in the Martian atmosphere," said Laila Andersson of the University of Colorado's Laboratory for Atmospherics and Space Physics (CU LASP), Boulder, Colorado.
The cloud was detected by the spacecraft’s Langmuir Probe and Waves (LPW) instrument, and has been present the whole time MAVEN has been in operation. It is unknown if the cloud is a temporary phenomenon or something long lasting. The cloud density is greatest at lower altitudes. However, even in the densest areas it is still very thin. So far, no indication of its presence has been seen in observations from any of the other MAVEN instruments.
Possible sources for the observed dust include dust wafted up from the atmosphere; dust coming from Phobos and Deimos, the two moons of Mars; dust moving in the solar wind away from the sun; or debris orbiting the sun from comets. However, no known process on Mars can explain the appearance of dust in the observed locations from any of these sources.
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A map of IUVS’s auroral detections in December 2014 overlaid on Mars’ surface. The map shows that the aurora was widespread in the northern hemisphere, not tied to any geographic location. The aurora was detected in all observations during a 5-day period.
Image Credit: University of Colorado
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MAVEN's Imaging Ultraviolet Spectrograph (IUVS) observed what scientists have named "Christmas lights." For five days just before Dec. 25, MAVEN saw a bright ultraviolet auroral glow spanning Mars' northern hemisphere. Aurora, known on Earth as northern or southern lights, are caused by energetic particles like electrons crashing down into the atmosphere and causing the gas to glow.
"What's especially surprising about the aurora we saw is how deep in the atmosphere it occurs - much deeper than at Earth or elsewhere on Mars,” said Arnaud Stiepen, IUVS team member at the University of Colorado. “The electrons producing it must be really energetic."
The source of the energetic particles appears to be the sun. MAVEN's Solar Energetic Particle instrument detected a huge surge in energetic electrons at the onset of the aurora. Billions of years ago, Mars lost a global protective magnetic field like Earth has, so solar particles can directly strike the atmosphere. The electrons producing the aurora have about 100 times more energy than you get from a spark of house current, so they can penetrate deeply in the atmosphere.
The findings are being presented at the 46th Lunar and Planetary Science Conference in The Woodlands, Texas.
MAVEN was launched to Mars on Nov. 18, 2013, to help solve the mystery of how the Red Planet lost most of its atmosphere and much of its water. The spacecraft arrived at Mars on Sept. 21, and is four months into its one-Earth-year primary mission.
"The MAVEN science instruments all are performing nominally, and the data coming out of the mission are excellent," said Bruce Jakosky of CU LASP, Principal Investigator for the mission.
MAVEN is part of the agency's Mars Exploration Program, which includes the Opportunity and Curiosity rovers, the Mars Odyssey and Mars Reconnaissance Orbiter spacecraft currently orbiting the planet.
NASA's Mars Exploration Program seeks to characterize and understand Mars as a dynamic system, including its present and past environment, climate cycles, geology and biological potential. In parallel, NASA is developing the human spaceflight capabilities needed for its journey to Mars or a future round-trip mission to the Red Planet in the 2030’s.
MAVEN's principal investigator is based at the University of Colorado's Laboratory for Atmospheric and Space Physics, and NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the MAVEN project. Partner institutions include Lockheed Martin, the University of California at Berkeley, and NASA's Jet Propulsion Laboratory.
Quelle: NASA

Tags: Mars-Chroniken 

1840 Views

Mittwoch, 18. März 2015 - 11:45 Uhr

Astronomie-History - Kosmos 1939: Was wissen wir eigentlich vom Mars ?

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Aus dem CENAP-Archiv:

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Quelle: KOSMOS, CENAP-Archiv


Tags: Astronomie 

1651 Views

Mittwoch, 18. März 2015 - 09:40 Uhr

Raumfahrt - Start von Falcon 9 mit TurkmenAlem52E/MonacoSat Satelliten

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Mar 21 - Falcon 9 : TurkmenAlem52E/MonacoSat Launch site Cape Canaveral AFB, FL
Launch Date Mar 21
From Launch Pad SLC-40
Launch Window : 4:04pm to 5:04pm EDT (20:04 to 21:04 GMT)
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Quelle: AS
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Helium issue delays SpaceX launch set for Saturday
Problems with a helium tank used for pressurization dissuaded SpaceX engineers from proceeding toward a Saturday launch of a Turkmenistan communications satellite. The new launch date has yet to be set and is likely at least a week later.
The Falcon 9 rocket that was to carry the satellite was scheduled to have a so-called static fire test — a final dress-rehearsal countdown culmination in a brief firing of the first stage's nine engines while the rocket remains held down on the Cape Canaveral Air Force Station pad in Florida — on Tuesday. But the helium tank issue brought the test to a halt, and SpaceX officials decided to call off Saturday's launch so they could have more time to examine the problem.
SpaceX president Gwynne Shotwell announced the delay Tuesday while addressing the Satellite 2015 conference in Washington. According to SpaceNews' Peter B. de Selding, Shotwell also told conference attendees that SpaceX is preparing an enhanced Falcon 9 with around 15 to 20 percent greater capacity based on ramping the Merlin 1D engines up to their full rated ability.
Such an improvement would allow SpaceX to recover its first stage even on fuel-intensive launches such as geostationary satellites. In the Falcon 9's current configuration, the fuel needs for such missions — including the previous launch of a pair of communications satellites, and the upcoming communications satellite launch — have precluded attempts to land the first stage on SpaceX's offshore drone ship.
The two attempts SpaceX has made have resulted in partial successes, with a stage in January on target and only crashing at the last moment after steering "grid" fins ran out of hydraulic fluid (capacity has since been increased) and a stage a month later splashing down within 10 meters of where the ship would have been, had high seas not forced the drone ship to abandon its station.
Quelle: WacoTribune


Tags: Raumfahrt 

1648 Views

Mittwoch, 18. März 2015 - 07:45 Uhr

Astronomie - Heller Bolide über Süddeutschland gegen 20.45 MEZ beobachtet - Teil2/2

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BRIGHT FIREBALL, POSSIBLE METEORITE FALL: Last night, a meteor exploded over southern Germany. The shadow-casting fireball was brighter than the full Moon and it produced loud sonic booms – a sign that it penetrated deep in the atmosphere and may have dropped meteorites on the ground. Attracted by the sounds, astrophotographer Hans Hopf of Bavaria, Germany, turned his camera to the sky just in time to capture a plume of debris twisting in the winds overhead:

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I could see the 'smoke' twisting and turning through the constellation Orion for more than 20 minutes after the meteor exploded," says Hopf. "The field of view of these images is about 10 degrees. The bright star is Betelgeuse (Alpha Orionis)."
The International Meteor Organization is gathering eyewitness reports through their new online reporting tool. European readers, if you witnessed this event, please report it. Your sighting could help pinpoint the landing zone of possible meteorites.
Quelle: Spaceweather
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Quelle: Focus
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Update: 19.00 MEZ
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Update: 18.03.2015
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Sehr geehrte Damen und Herren,
wir hoffen das wir mit unserer Meldung bei Ihnen richtig sind.
Am 15.03.2015 haben wir den bereits in den Nachrichten veröffentlichten Meteroiten gesehen.
Gegen ca. 20.43 Uhr fuhren wir die L76b Richtung Reichental (Ortsteil von 76593 Gernsbach). Auf ca. der halben Strecke sahen wir den Meteroiten am Himmel vor uns vorbeifliegen in Richtung Wald. Er war grün/bläulich mit einem hellen orangenem Schweif.
Der Meteroit war sehr deutlich und nah zu erkennen.
Aufgrund der Schnelle war es leider nicht möglich ein Video bzw. Bild aufzunehmen.
Wo der Meteroit hinflog/einschlug sich auflöste ist uns nicht bekannt.
Augenscheinlich sah es so aus, als hätte er in den Wäldern geendet.
Wir hoffen diese Informationen können für Sie nützlich sein.
Für weitere Fragen stehen wir gerne zur Verfügung.
Mit freundlichen Grüßen
Nadine H.& Nadine L.

Tags: Astronomie 

1574 Views

Mittwoch, 18. März 2015 - 07:40 Uhr

Astronomie - Heller Bolide über Süddeutschland gegen 20.45 MEZ beobachtet - Teil1/2

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15.03.2015

Ein heller Boilide/Meteorit ist heute Abend über Süddeutschland verglüht, derzeit bekommt die UFO-Meldestelle in Mannheim Anrufe aus den Gebieten

Weinheim / Hohensachsen Bergstraße : von Zenit 3 Sekunden grünlicher Feuerball welcher Teile verlor

Reutlingen : Grünlich leuchtender Feuerball 2 Sekunden

Mannheim : Grünlichbläulicher Feuerball wie Silvesterrakete 5 Sekunden

Westerburg : Grünliche Feuerkugel welche am Horizont einschlug /Heller Lichtblitz nach verschwinden hinter Waldbäumen

Heuchlingen : Grünbläulicher Feuerball Richtung Süden mit orangenem Schweif und heller Lichtblitz am Ende, man wollte los fahren um zu suchen.

Stand 21.40 MEZ

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22.05 MEZ:

Per E-mail:

Meine Frau Carmen und ich Ralf Schäfer haben heute auf der Heimfahrt um ca 20:45 Uhr ein sehr seltsames Licht am Himmel gesehen. Es ist eine Sternenklare Nacht.
Wir fuhren von Pirmasens den Berg runter nach 66955 Niedersimten und sahen einen ca 2cm langen Leuchtstreifen, ich sage blau, Carmen  meint eher grün, von Pirmasens Richtung Obersimten in sehr schnellem Tempo am Himmel. Wir sahen ihn Beide ca 5 Secunden (es kam uns viel länger vor) 
Es waren keine Geräusche zu hören obwohl es uns sehr nah vorkam.
Wir wissen wirklich nicht, was es sein könnte, aber für eine Sternschnuppe war es zu blau und für ein Flugzeug zu leise und zu schnell, ein Feuerwerkskörper leuchtet nicht so lange.   
Haben Sie eine Idee was es sein könnte? Wir sind Ratlos.
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Update: 22.40 MEZ

Meldungen aus der Schweiz
Schlug ein Meteorit in der Schweiz ein?
Zahlreiche Leser aus der ganzen Schweiz berichten von einem hellen, grünen Licht am Himmel, gefolgt von einem Knall. Laut Experten könnte dies auf einen Meteoriteneinschlag hindeuten.
«Um zirka 20.50 Uhr haben wir ein grünliches Licht am Himmel gesehen, das sich extrem schnell bewegt hat», berichtet ein Leser-Reporter aus Eschenbach. Auch Sven aus Unterkulm hat die gleiche Beobachtung gemacht. «Zwei bis drei Minuten später folgte ein Knall.» Zahlreiche weitere Leser aus der gesamten Schweiz melden ähnliche Erscheinungen.
«Die Meldungen deuten klar auf einen Meteoriten hin. Aufgrund der akkustische Begleiterscheinung wäre es möglich, dass er den Erdboden erreicht hat», sagt Markus Griesser von der Sternwarte Eschenberg zu 20 Minuten. Ob und wo der Meteorit eingeschlagen hat, müssten nun wissenschaftliche Auswertungen zeigen. Dies könnte aber mehrere Tage in Anspruch nehmen.
Bei den Polizeistationen sind zahlreiche Meldungen von beunruhigten Bürgern eingegangen.
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Ein Leser-Reporter aus Amriswil TG gelang eine Aufnahme des Meteoriten.
Aufnahme aus Greifensee ZH.
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Update: 22.45 MEZ

Meteoriten/Bolide-Video aus Tirol:


zu sehen hier: https://www.youtube.com/watch?v=2S0CHjrVCgc

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Bei Wetterzentrale:

Meteorit München!????
geschrieben von: Roman 
Datum: 15. März 2015 21:00
Bin gerade zuhause und habe vor ein paar Minuten aus Zufall etwas hellweißes, leuchten am Himmel, fast senkrecht vorbei ziehen sehen. Jemand da, der diese Beobachtung teilen kann??? 
Besten Dank schon mal!
Viele Grüße, 
Roman aus München (Südwesten)

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Lichterscheinung am Himmel über der Region gibt Rätsel auf
Meteor über Bayern? Mehrere Menschen haben am Sonntagabend ein helles Licht am Himmel über der Region entdeckt. Viele riefen bei der Polizei an. Was steckt dahinter?
Eine rätselhafte Lichterscheinung sorgte am Sonntagabend gegen 20.45 Uhr für Aufregung. Raste ein Meteor über Bayern hinweg? Augenzeugen berichten von einem "grünen Licht". Nicht nur in den sozialen Netzwerken wurde der helle Schein diskutiert, auch bei der Polizei in Augsburg gingen deshalb mehrere Anrufe ein. Das bestätigte ein Sprecher am Abend.
Was steckt hinter dem "hellen Schein"? Ein Meteorit?
Von Donauwörth bis Landsberg und München wunderten sich demnach Menschen über den plötzlich aufgetretenen hellen Schein am Himmel. Was dahintersteckt, ist bislang noch unklar. Auch die Redaktion von AZ Online erreichten am Abend mehrere Nachrichten. "Es sah aus wie ein Feuerball und war sehr schnell...", schrieb etwa ein Leser. Eine Anruferin aus der Augsburger Innenstadt sagte: "Es sah so aus, als würde eine leuchtende Kugel rasant nach unten stürzen."
Auf der Facebook-Seite der Augsburger Allgemeinen kommentierten innerhalb kürzester Zeit mehrere User einen Artikel, der auf das Lichtspektakel am Himmel verwies. Viele aus der Region hatten den "grünen Ball" mit eigenen Augen gesehen. Einige, so schrieben sie, seien von ihren Freunden deshalb zunächst für "verrückt" erklärt worden.
Bei der Augsburger Polizei herrschte am Abend Ratlosigkeit. Ein Anruf bei der Deutschen Flugsicherung brachte einem Sprecher zufolge keine Hinweise. Auch mit den Kollegen beim Polizeipräsidium Oberbayern Nord in Ingolstadt habe man sich ausgetauscht, hieß es. Dort seien ebenfalls viele Anrufe, sogar noch mehr als in Augsburg, eingegangen.
Gruß aus dem All: Meteoriten, Meteore und Sternschnuppen1 von 6vorherige Seitenächste Seite
Bei METEORITEN handelt es sich um nicht vollständig verglühte kosmische Brocken, die auf der Erde einschlagen. Diese Trümmer aus dem Weltall können von Kometen, Asteroiden oder anderen Planeten abgesprengt worden sein.
Quelle: Augsburger Allgemeine

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Update: 16.03.2015 / 8.00 MEZ

Nach Telefondienst durch die Nacht und er geht weiter, sind wir bei 87 Meldungen und inzwischen gehen wir von 2 Boliden aus welche über dem süddeutschen Raum sowie der Schweiz und Österreich für Aufregung sorgte. Anfangs gingen wir von Uhrzeitverwechslungen aus. Aber in der Nacht kristallisierte sich immer mehr heraus das Bolide 1 (grünbläulich) gegen 20.44 MEZ und Bolide 2 (orangerötlich) gegen 21.45 MEZ beobachtet wurden. Da im Moment ständig weitere Informationen eintreffen, bleiben wir hier am (Boliden) Ball...

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Update: 8.15 MEZ
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Hallo Herr Köhler,
wir haben eine Augenzeugin hier in Oberösterreich, die die Feuerkugel sehr tief über dem Westhorizont gesehen hat.
Leider haben wir mit unserer All-Sky-DSLR tief im Westen eine Zone, die wir nicht fotografieren können.
Daher ist uns diesmal diese Feuerkugel "entkommen"
mit besten Grüßen
Erwin Filimon
Astronomischer Arbeitskreis Salzkammergut / Sternwarte Gahberg
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Mysteriöses Leuchten
Meteorit erschreckt Bürger in Süddeutschland
Ein faustgroßer Meteorit ist am Abend durch den Nachthimmel über Süddeutschland und der Schweiz gerast. Besorgte Bürger riefen bei der Polizei an. Schäden soll der fallende Himmelskörper keine angerichtet haben.
16.03.2015
Im Süden Deutschlands und in der Schweiz haben viele Bürger am Sonntagabend ein helles Licht am Nachthimmel beobachtet. Experten der Schweizerischen Astronomischen Gesellschaft zufolge hat es sich dabei um einen Meteoriten gehandelt, berichten Medien in der Schweiz. Der Meteorit könnte etwa faustgroß gewesen sein, sagte Jonas Schenker von der Fachgruppe Meteorastronomie. Dass gleichzeitig ein Donnergrollen zu hören gewesen sei, deute daraufhin, dass der Meteorit der Erdoberfläche sehr nahe gekommen sei.
Bei zahlreichen Polizeipräsidien in Baden-Württemberg und Bayern riefen Menschen an. „Dutzende besorgte Bürger haben berichtet, dass sie Lichtblitze am Himmel sahen“, sagte ein Sprecher des Lagezentrums der bayerischen Polizei in München. In Baden-Württemberg meldeten sich nach Angaben des Lagezentrums in Stuttgart rund 100 Menschen bei der Polizei. „Aber wir haben keine Erkenntnisse über irgendwelche Schäden“, sagte ein Sprecher im Innenministerium.
Auch in Frankfurt sah man ein Leuchten
Dem Lagezentrum zufolge sahen die Anrufer das Licht kurz vor 21 Uhr am Himmel aufleuchten. Entsprechende Meldungen habe es aus verschiedenen Orten gegeben, etwa Mannheim, Freiburg der Bodensee-Region und dem Raum München.
Auch in Frankfurt habe ein Anrufer ein glühendes Licht südlich des Flughafens beobachtet, sagte eine Sprecherin der Deutschen Flugsicherung (DFS) in Langen. Aber kein DFS-Mitarbeiter habe selbst Lichtphänomene gesehen. „Unsere Fluglotsen hatten auch nichts auf dem Radar, und wir vermissen kein Flugzeug“, sagte die Sprecherin.
Quelle: FAZ

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Update: 10.30 MEZ 

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Lichtball am Himmel sorgt für Aufregung in Süddeutschland
Ein leuchtender Ball zieht am nächtlichen Himmel entlang und verglüht. Viele Menschen im Süden Deutschlands melden dies am Sonntagabend der Polizei. Was genau sie beobachtet haben, ist noch unklar.
Stuttgart/Berlin. Im Süden Deutschlands haben viele Bürger am gestrigen Sonntagabend einen Lichtschweif am Nachthimmel beobachtet. Um was es sich dabei handelte, war zunächst unklar. "Es könnte ein Meteorit gewesen sein, der verglüht ist, das ist nicht so selten", sagte Gerhard Drolshagen, Experte für erdnahe Objekte der Europäischen Weltraumagentur (ESA), der Deutschen Presse-Agentur.
Bei zahlreichen Polizeipräsidien in Süddeutschland riefen Menschen an und teilten ihre Beobachtungen mit. Bei der Polizei Mannheim waren am Abend zwischen 20.45 Uhr und 21.00 Uhr insgesamt fünf Meldungen eingegangen. Zeugen aus Sinsheim, Eberbach und Neckargemünd hatten ein "großes brennendes Objekt mit Schweif" gemeldet, so die Polizei. In Baden-Württemberg meldeten sich nach Angaben des Lagezentrums in Stuttgart insgesamt rund 100 Menschen aus verschiedenen Orten, darunter Karlsruhe, Freiburg und der Bodensee-Region. "Aber wir haben keine Erkenntnisse über irgendwelche Schäden", sagte ein Sprecher.
Auch in Bayern hatten dutzende besorgte Bürger berichtet, dass sie Lichtblitze am Himmel sahen, sagte ein Sprecher des Lagezentrums der bayerischen Polizei in München. In Unterfranken hatten Bürger offenbar zunächst Angst, es könnte ein Flugkörper abgestürzt sein, wie die dortige Polizei berichtete. Auch Streifenpolizisten sahen demnach im Landkreis Schweinfurt einen weißen Schweif langsam in südöstliche Richtung fliegen.Im Saarland riefen ebenfalls vereinzelt Bürger die Polizei an. "Wir hatten eine Handvoll Sichtungen", sagte ein Sprecher des Lagezentrums in Saarbrücken. Auch in Frankfurt habe ein Anrufer ein glühendes Licht südlich des Flughafens beobachtet, sagte eine Sprecherin der Deutschen Flugsicherung (DFS) in Langen. Aber kein DFS-Mitarbeiter habe selbst Lichtphänomene gesehen. "Unsere Fluglotsen hatten auch nichts auf dem Radar, und wir vermissen kein Flugzeug", sagte die Sprecherin. Der schweizerischen Nachrichtenagentur sda zufolge gingen bei der Polizei im Nachbarland ähnliche Anrufe ein.
Video von Mannheim:
Quelle: Mannheimer Morgen
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Update: 15.00 MEZ
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Video zu sehen hier: https://www.youtube.com/watch?v=aGH3LUIDOwE
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Quelle: Badische Zeitung
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Update: 17.00 MEZ  / Update: 21.45 MEZ

Aus folgenden Orten und Städte bekam CENAP Meldungen über  zwei Meteoriten:

Meteorit 1 / 20.44 MEZ: 

Weinheim/Bergstraße, Koblenz, Pirmasens, Bingen am Rhein, Limburg, Idstein, Pfungstadt, Hanau, Darmstadt, Bensheim, Hohensachsen/Bergstraße, Erbach, Mannheim, Sinsheim, Mosbach, Heuchlingen, Reutlingen, Stuttgart, Karlsruhe, Mannheim,  Frankfurt-Höchst, Haßloch/Pfalz, Landau/Pfalz, Basel-Schweiz, Donaueschingen, Singen, Ludwigsburg, Weinheim, Linz-Österreich, Sindelfingen, Schwäbisch-Hall, Feuchtwangen, Gunzenhausen, München-Dachau, München, Treuchtlingen, Nördlingen, Hechingen, Balingen, Wertheim, Aschaffenburg, Worms, Neustadt/Pfalz, Bad-Rappenau, Schwäbisch-Hall, Bad-Kreuznach, Autobahn-5, Bruchsal, Autobahn-6, Neckargemünd, Schönau, Meckesheim, Kirschhard, Gemmingen, Gaiberg, Zuzenhausen, Östringen,  Kraichtal, Appenweiher, Offenburg, Freiburg, Schutterwald, Breisach, Todtnau, Lörrach, Bastenheim, Kemis-Schweiz, Bad-Rellingen,  Münstertal-Schwarzwald, , Schallstadt,  Bernau, Bredesbach, Karlsruhe, Baden-Baden,  Linkenheim,  Dossenheim-Bergstraße, Schriesheim-Bergstraße, Neckargemünd, St.Leon-Rot, Bürstadt, Grasellenbach, Abtsteinach, Bürstadt, Lauetrtal, Oftersheim, Reutlingen, Waldshut,Westerburg, Heidelberg, Michelbach, Mannheim, Ludwigsburg, Alzey, Rottweil,

 

Meteorit 2 / 21.40 MEZ:

Tuttlingen, Ravensburg, Ittlingen, Seewald,  Emmendingen, Hirtzfeld, Götterzell, Regen, 

Aufführung der Beobachtungsorte nach Meldeeingang.

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Update: 19.45 MEZ

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Update: 21.45 MEZ

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Update: 17.03.2015

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Hallo zusammen,
ich saß am So.Abend gegen 20Uhr45 beim Essen im Wohnzimmer im ersten Stock mit Blick durchs Fenster in Richtung Süden, da sah ich plötzlich einen großen hellen Feuerschein, ganz nah wie eine Rakete ungefähr 1Meter lang 2-4 Sekunden in Richtung Süden und verschwand ganz nah am Horizont. Der Schweif war am Austritt rot und länger nach hinten hell weis gefärbt, wie bei einer echten Weltraumrakete.
Als ich den Feuerschein sah sprang ich sofort auf um den Tisch herum ans Fenster, meine Frau saß auf dem Sofa beim Fernsehen und sagte, was ist denn mit dir los,ich sagte zu ihr ein Feuerschweif,eine Rakete oder ein Meteorit kam gerade herunter so groß und hell habe ich sowas noch nie gesehen.
Willi Spiegel in Großfischlingen Pfalz
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Frams von TV-Beiträgen HR-3

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CENAP-UFO-Meldestelle Mannheim

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Quelle: HR-3

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Tags: Astronomie 

1915 Views

Dienstag, 17. März 2015 - 22:00 Uhr

Astronomie - NASA-Raumsonde LRO findet neuen Einschlagskrater auf dem Mond

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NASA's LRO Spacecraft Finds March 17, 2013 Impact Crater and More
NASA’s Lunar Reconnaissance Orbiter (LRO) acquired images of the lunar surface before and after the largest recorded explosion occurred on the surface.
On March 17, 2013, an object the size of a small boulder hit the surface in Mare Imbrium and exploded in a flash of light nearly 10 times as bright as anything ever recorded before.
This bright flash was recorded by researchers at NASA’s Marshall Space Flight Center in Huntsville with coordinates 20.6°N, 336.1°E. The Lunar Reconnaissance Camera (LROC) scientists were able to obtain observations before and after the impact. Comparing the actual size of the crater to the brightness of the flash helps validate impact models.
LROC’s first set of post-impact flash images acquired on May 21, 2013 by the Narrow Angle Camera (NAC) were targeted on the Marshall-reported coordinates and numerous small surface disturbances (“splotches”) were detected by comparing the pre- and post-flash images, but no new crater was found.
A second set of NAC images was acquired on July 1, 2013, showing three faint ray-like features and several chains of splotches and asymmetric splotches that generally pointed to a common area west of the Marshall coordinates. A NAC pair was targeted on that convergence point for July 28, 2013; comparison of this third set of images with preexisting coverage revealed a new crater.
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Before and After Images:
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This image pairing shows a lunar impact crater created on March 17, 2013. The two images are from the LROC instrument aboard NASA's Lunar Reconnaissance Orbiter. The left image is from Feb. 12, 2012, and the right image is from July 28, 2013. The new crater is about 59 feet wide. Click and drag the slider bar to swipe between the two images.
Image Credit: NASA/Goddard Space Flight Center/Arizona State University
The crater itself is small, measuring 18.8 meters (61.7 feet) in diameter, but its influence large; debris excavated by the sudden release of energy flew for hundreds of meters. More than 200 related surficial changes up to 30 kilometers (19 miles) away were noted.
The results are published in the January 31 edition of the journal Icarus.
The March 17 impact crater is one of thousands of craters being mapped by the instrument. The LROC team is going back to images taken in the first year or two and comparing them to recent images. Called temporal pairs, these before/after images enable the search for a range of surface changes, including new impact craters, formed between the time the first and second image were acquired.
As of January 1, 2015, LROC has acquired about 10,000 before and after image pairs.
Launched on June 18, 2009, LRO has collected a treasure trove of data with its seven powerful instruments, making an invaluable contribution to our knowledge about the moon. LRO is managed by NASA's Goddard Space Flight Center in Greenbelt, Maryland, for the Science Mission Directorate at NASA Headquarters in Washington.
Quelle: NASA

Tags: Astronomie 

2036 Views


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