GSAT-19

GSAT-19 is an Indian communications satellite launched by the Indian Space Research Organisation aboard a GSLV Mark III on 5 June 2017.[2]

GSAT-19
Render of GSAT-19
Mission typeCommunications
OperatorINSAT
COSPAR ID2017-031A
SATCAT no.42747
WebsiteGSAT-19
Mission durationPlanned: 10 years[1]
Elapsed: 3 years, 7 months, 11 days
Spacecraft properties
BusI-3K
ManufacturerISRO Satellite Centre
Space Applications Centre
Launch mass3,136 kg (6,914 lb)[1]
Dry mass1,394 kg (3,073 lb)[1]
Dimensions2.0 × 1.77 × 3.1 m (6.6 × 5.8 × 10.2 ft)[1]
Power4,500 watts[1]
Start of mission
Launch date5 June 2017, 11:58 (2017-06-05UTC11:58) UTC[2]
RocketGSLV Mark III-D1[3]
Launch siteSatish Dhawan SLP
ContractorISRO
Orbital parameters
Reference systemGeocentric
RegimeGeostationary
Longitude48° E[4]
Perigee altitude35,470 km (22,040 mi)
Apogee altitude35,869 km (22,288 mi)
Inclination0.101 deg
Period23 hr, 50 min, 10 sec
Epoch10 June 2017, 02:29 UTC[5]
Transponders
Band
Coverage areaIndia
 

Satellite and payloads

The satellite will act as a testbed for the modular I-6K satellite bus, carrying experimental technologies such as ion thrusters for manoeuvring and stabilisation, active thermal control using thermal radiators, a miniaturised inertial reference unit, indigenously produced lithium-ion batteries, and C-band traveling-wave-tube amplifiers.[6][7][8]

Rather than traditional transponders, GSAT-19 carries four Ku/Ka-band forward link beams and four Ku/Ka-band return link beams, providing much higher data throughput than India's previous communications satellites.[9][10] It additionally carries a Geostationary Radiation Spectrometer (GRASP) payload, which will "monitor and study the nature of charged particles and the influence of space radiation on satellites and their electronic components".[11]

Orbit raising and station keeping

The satellite was launched aboard the GSLV Mk III-D1 rocket in the evening of 5 June 2017 to a geostationary transfer orbit perigee of 180 km (112 mi). This was followed by a series of orbit raising operations (using an on-board LAM and chemical thrusters[1]) to place the satellite in the intended geostationary orbital slot.

Op # Date/
Time (UTC)		 LAM burn time Height achieved Inclination
achieved		 Orbital period References
ApogeePerigee
16 June 2017
08:33		116 s35,938 km (22,331 mi)172.77 km (107.35 mi)21.56°10 h, 30 min[12]
27 June 2017
10:14		5538 s35,840 km (22,270 mi)10,287 km (6,392 mi)7.02°13 h, 58 min[13]
39 June 2017
04:25		3469 s35,875 km (22,292 mi)30,208 km (18,770 mi)0.793°21 h, 38 min[14]
410 June 2017
02:29		488 s35,869 km (22,288 mi)35,470 km (22,040 mi)0.101°23 h, 50 min, 10 s[5]

References
  1. "GSLV Mark III-D1 / GSAT-19 Mission" (PDF). Indian Space Research Organisation.
  2. Clark, Stephen (5 June 2017). "India's launcher fleet gets an upgrade with successful test flight". Spaceflight Now. Retrieved 6 June 2017.
  3. Laxmi Ajai, Prasannal (19 May 2017). "Come June 5, ISRO to launch 'game changer' rocket". The Times of India. Times News Network. Retrieved 21 May 2017.
  4. "Delivered Communication and Navigation Payloads". ISRO/Space Applications Centre. Retrieved 6 June 2017.
  5. "The fourth and final orbit raising operation..." Indian Space Research Organisation. 10 June 2017. Archived from the original on 13 June 2017. Retrieved 12 June 2017.
  6. "Annual Report: 2014-2015" (PDF). Indian Space Research Organisation. 2015. p. 26.
  7. "First Prototype of ISRO's Semi-Cryogenic Engine To Be Ready By 2016". AA Me, IN. 19 August 2015. Retrieved 26 October 2016.
  8. "GSat 19". Gunter's Space Page. Retrieved 27 May 2016.
  9. "Isro's GSAT-19, GSAT-11 satellites: Game changers in communications". The Times of India. Press Trust of India. 5 June 2017. Retrieved 26 June 2017.
  10. Graham, William (5 June 2017). "GLSV Mark III rocket conducts 'all-up' launch with GSAT-19 satellite". NASASpaceFlight.com. Retrieved 26 June 2017.
  11. Ramachandran, R. (26 June 2017). "ISRO's Mk III Launched a Little-Known Instrument Called GRASP – This Is What It Does". The Wire. Retrieved 26 June 2017.
  12. "The first orbit raising operation..." Indian Space Research Organisation. 8 June 2017. Retrieved 12 June 2017.
  13. "The second orbit raising operation..." Indian Space Research Organisation. 8 June 2017. Retrieved 12 June 2017.
  14. "The third orbit raising operation..." Indian Space Research Organisation. 10 June 2017. Retrieved 12 June 2017.
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