GSAT-19
{{Short description|Indian communications satellite}}
{{Infobox spaceflight
| auto = all
| name = GSAT-19
| image = File:Render of GSAT-19 in deployed configuration.png
| image_caption = Render of GSAT-19
| mission_type = Communications
| operator = INSAT
| COSPAR_ID = 2017-031A
| SATCAT = 42747
| website = [http://isro.gov.in/Spacecraft/gsat-19 GSAT-19]
| mission_duration = Planned: 10 years{{cite web |url=http://www.isro.gov.in/sites/default/files/flipping_book/GSLV%20Mark%20III%20D1/files/assets/common/downloads/GSLV%20Mark%20III%20D1.pdf |title=GSLV Mark III-D1 / GSAT-19 Mission |publisher=Indian Space Research Organisation |access-date=2017-06-05 |archive-date=2017-07-12 |archive-url=https://web.archive.org/web/20170712123653/http://www.isro.gov.in/sites/default/files/flipping_book/GSLV%20Mark%20III%20D1/files/assets/common/downloads/GSLV%20Mark%20III%20D1.pdf |url-status=dead }}
Elapsed: {{time interval|5 June 2017 11:58|show=ymd|sep=,}}
| spacecraft_bus = I-3K
| manufacturer = ISRO Satellite Centre
Space Applications Centre
| launch_mass = {{convert|3136|kg|lb|abbr=on}}
| dry_mass = {{convert|1394|kg|lb|abbr=on}}
| dimensions = {{convert|2.0|xx|1.77|xx|3.1|m|ft|abbr=on}}
| launch_date = {{start-date|5 June 2017, 11:58}} UTC{{cite news |url=https://spaceflightnow.com/2017/06/05/indias-launcher-fleet-gets-an-upgrade-with-successful-test-flight/ |title=India's launcher fleet gets an upgrade with successful test flight |work=Spaceflight Now |first=Stephen |last=Clark |date=5 June 2017 |access-date=6 June 2017}}
| launch_rocket = LVM3-D1{{cite news |url=http://timesofindia.indiatimes.com/india/isro-all-set-for-indias-most-powerful-launch-vehicle/articleshow/58754518.cms |title=Come June 5, ISRO to launch 'game changer' rocket |work=The Times of India |agency=Times News Network |first=Prasannal |last=Laxmi Ajai |date=19 May 2017 |access-date=21 May 2017}}
| launch_site = Satish Dhawan SLP
| launch_contractor = ISRO
| entered_service =
| disposal_type =
| deactivated =
| orbit_reference = Geocentric
| orbit_regime = Geostationary
| orbit_periapsis = {{convert|35470|km|mi|0|abbr=on}}
| orbit_apoapsis = {{convert|35869|km|mi|0|abbr=on}}
| orbit_inclination = 0.101 deg
| orbit_period = 23 hr, 50 min, 10 sec
| apsis = gee
| trans_band = {{plainlist|
- 4 × Ku/Ka forward links
- 4 × Ku/Ka return links
}}
| trans_frequency =
| trans_bandwidth =
| trans_capacity =
| trans_coverage = India
| trans_TWTA =
| trans_EIRP =
| trans_HPBW =
| programme = GSAT
| previous_mission = GSAT-9
| next_mission = GSAT-17
}}
GSAT-19 is an Indian communications satellite launched by the Indian Space Research Organisation aboard an LVM3 on 5 June 2017.
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.{{cite web |url=http://www.isro.gov.in/sites/default/files/pdf/AR2014-15.pdf |title=Annual Report: 2014-2015 |publisher=Indian Space Research Organisation |page=26 |date=2015 |access-date=2016-10-26 |archive-date=2016-03-04 |archive-url=https://web.archive.org/web/20160304201832/http://www.isro.gov.in/sites/default/files/pdf/AR2014-15.pdf |url-status=dead }}{{cite web |url=http://www.aame.in/2015/08/first-prototype-of-isro-semi-cryogenic.html |title=First Prototype of ISRO's Semi-Cryogenic Engine To Be Ready By 2016 |work=AA Me, IN |date=19 August 2015 |access-date=26 October 2016}}{{cite news |url=http://space.skyrocket.de/doc_sdat/gsat-19.htm |title=GSat 19 |work=Gunter's Space Page |access-date=27 May 2016}}
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.{{cite news |url=http://timesofindia.indiatimes.com/india/isros-gsat-19-11-satellites-a-revolution-in-communications/articleshow/58983052.cms |title=Isro's GSAT-19, GSAT-11 satellites: Game changers in communications |work=The Times of India |agency=Press Trust of India |date=5 June 2017 |access-date=26 June 2017}}{{cite news |url=https://www.nasaspaceflight.com/2017/06/glsv-mark-iii-rocket-launch-gsat-19-satellite/ |title=GLSV Mark III rocket conducts 'all-up' launch with GSAT-19 satellite |work=NASASpaceFlight.com |first=William |last=Graham |date=5 June 2017 |access-date=26 June 2017}} 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".{{cite news |url=https://thewire.in/151354/grasp-isro-mk3-radiation-gsat-20/ |title=ISRO's Mk III Launched a Little-Known Instrument Called GRASP – This Is What It Does |work=The Wire |first=R. |last=Ramachandran |date=26 June 2017 |access-date=26 June 2017}}
Orbit raising and station keeping
The satellite was launched aboard the LVM3-D1 rocket in the evening of 5 June 2017 to a geostationary transfer orbit perigee of {{convert|180|km|mi|0|abbr=on}}. This was followed by a series of orbit raising operations (using an on-board LAM and chemical thrusters) to place the satellite in the intended geostationary orbital slot.
References
{{Reflist}}
{{GSAT Satellites}}
{{Indian spacecraft}}
{{Orbital launches in 2017}}