PSLV-C34 with 20 satellites all set for new experiments
The Polar Satellite Launch Vehicle (PSLV-C34), which will lift off at 9.25 a.m. on June 22 from Sriharikota, is an important mission for the Indian Space Research Organisation (ISRO).
The vehicle will not only put 20 satellites into the same orbit — the highest number of satellites to be put into orbit by a PSLV — but it will perform two tricky experiments of the same nature. Fifty minutes after the satellites are injected into the orbit from the fourth stage of the vehicle, its engine will be re-ignited for five seconds. Then it will be shut down for 50 minutes and re-ignited for another five seconds, according to K. Sivan, Director, Vikram Sarabhai Space Centre, Thiruvananthapuram.
The ISRO wants to master this complex manoeuvre so that it can put multiple satellites into different orbits using the same rocket. A forthcoming PSLV launch will put the ISRO’s SCATSAT-1, meant for forecasting weather and cyclone detection, and a foreign satellite in two different orbits.
On December 16, 2015, after the PSLV-C29’s fourth stage put six Singapore satellites into the same orbit, the ISRO re-started the fourth-stage engine for four seconds. At that time, Dr. Sivan called it a “small experiment” to master the manoeuvre of putting multiple satellites into different orbits with the same vehicle.
On June 22, eight minutes after the PSLV-C34 lifts off, the fourth stage engine will sizzle into life, taking the stage to an altitude of 514 km. The fourth stage engine will be cut off 16 minutes and 30 seconds after the lift-off. Over the next 10 minutes, 20 satellites will be injected into the same orbit from the fourth stage, one after another.
Dr. Sivan said: “After each satellite is injected into orbit, the vehicle will be re-oriented if required and the next satellite will be put into orbit with a varying velocity so that the distance between the satellites grows monotonically. We will do this to ensure that there is no collision of satellites. Then, after a huge gap of 3,000 seconds, PS-4 [the fourth stage] will be re-ignited for five seconds. Then, it will be switched off for another 3,000 seconds. It will be re-ignited for another five seconds.”
On April 28, 2008, the PSLV-C9 deployed 10 satellites, but in the same orbit.
So far so good
P. Kunhikrishnan, Director, Satish Dhawan Space Centre, Sriharikota, said the PSLV-C34, with the 20 satellites, was moved to the launch tower on Saturday morning. “Everything is going on smoothly,” he said.
Quelle: THE HINDU
India’s Polar Satellite Launch Vehicle, in its thirty sixth flight (PSLV-C34), will launch the 727.5 kg Cartosat-2 series satellite for earth observation and 19 co-passenger satellites together weighing about 560 kg at lift–off into a 505 km polar Sun Synchronous Orbit (SSO). PSLV-C34 will be launched from the Second Launch Pad (SLP) of Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota on June 22, 2016 at 09:26 hrs (IST). It will be the fourteenth flight of PSLV in ‘XL’ configuration (with the use of solid strap-on motors).
The co-passenger satellites are from USA, Canada, Germany and Indonesia as well as two satellites from Indian University/Academic Institute. The total weight of all the 20 satellites carried onboard PSLV-C34 is about 1288 kg.
Startvorbereitung für PSLV-C34
All the 20 Spacecrafts integrated with PSLV-C34 - two halves of the heat shield are seen
PSLV-C34 Heat-shield closed with all the 20 satellites inside
Fully integrated PSLV-C34 at Vehicle Assembly Building
Fully integrated PSLV-C34 with all the Spacecrafts is being moved out of Vehicle assembly building to second launch...
Panoramic View of Fully integrated PSLV-C34 with all the 20 Spacecrafts being moved to second launch pad (SLP)
Fully integrated PSLV-C34 with all the 20 Spacecrafts at Second Launch Pad
PSLV-C34 on Second Launch Pad
Erfolgreicher Start von ISRO Launch Vehicle, PSLV-C34