RISAT-1 Mission
4/26/2012
As of March 28, 2017, RISAT-1 was functioning normally after ISRO corrected an anomaly identified following the 2016 fragmentation event.
As of November 8, 2016, only one fragment from the RISAT-1 event had entered the catalog as SSN 41797 and that fragment decayed from orbit on October 12, 2016.
As of April 4, 2012, the PSLV-C19 launch of RISAT-1 was most likely to occur on April 26, 2012 at 00:15 UTC.
RISAT-1 had a launch mass of about 1850 kg and was to be launched into a 536-km orbit by PSLV.
As of November 6, 2011, the launch of PSLV-C19 carrying RISAT-1 was planned for January 2012.
RISAT-1 has International Designator 2012-017A and U.S. Strategic Command Space Surveillance Network catalog number 38248.
At the time of the 30 September 2016 fragmentation event, RISAT-1 had been on orbit 4.4 years and was in a 97.6° inclination, 543 by 539 km orbit.
The RISAT-1 fragmentation event was categorized as an anomalous separation of multiple high area-to-mass ratio debris.
As of March 15, 2012, RISAT-1 was planned for launch in the second half of April 2012.
The Indian Radar Imaging Satellite RISAT-1 carries a C-band microwave synthetic aperture radar.
RISAT-1 had a design life specification of five years and had been in orbit about 4.5 years at the time of the 30 September 2016 fragmentation event.
Debris shed from RISAT-1 in 2016 exhibited a low ballistic coefficient (high area-to-mass ratio) and decayed quickly.
RISAT-1 was operating from an approximately 536-kilometre orbit with an orbital period of about 95 minutes and a local time of ascending node (LTAN) of roughly 06:00 and 18:00 hours.
The Indian Radar Imaging Satellite (RISAT-1) experienced a possible fragmentation event on 30 September 2016 between 02:00 and 06:00 GMT.