ISRO successfully carries out the fourth and final orbit raising operation for its IRNSS-1I satellite

The Indian Space Research Organisation (ISRO) has successfully carried out the fourth and final orbit raising operations of navigation satellite, IRNSS-1I , the space agency has said. The orbit raising operation took place at 9:05 PM on Sunday, the ISRO said. [caption id=“attachment_4414641” align=“alignleft” width=“380”] GSLV launch. ISRO[/caption] The achieved perigee height (nearest point to the earth) is 35,462.9 km and apogee height (farthest point to the earth) is 35,737.8 km. The IRNSS-1I was launched on 12 April. After a flight lasting about 19 minutes, the Polar Satellite Launch Vehicle (PSLV) achieved a Sub Geosynchronous Transfer Orbit with a perigee of 281.5 km and an apogee of 20,730 km inclined at an angle of 19.2 degree to the equator. At that point, the IRNSS-1I got separated from the rocket. Following that ISRO carried out four orbit raising operations on 13 April (first and second), 14 April (third operation) and 15 April. However, the ISRO did not provide any information for how many minutes the satellites’ onboard motors were fired for raising the orbit.