Ajay Kumar at 07:43, 2 September 2023

2023-09-02T07:43:30Z

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{{Infobox spaceflight
| name = GSAT-2
| image = GSAT-2 T.jpg
| image_caption =

| mission_type = [[Communications satellite|Communications]]
| operator = [[Indian Space Research Organisation|ISRO]]
| website = {{url|http://www.isro.org/satellites/gsat-2.aspx}}
| COSPAR_ID = 2003-018A
| SATCAT = 27807
| mission_duration = 3-5 years

| spacecraft_bus = [[I-2K]]
| manufacturer = [[Indian Space Research Organisation|ISRO]]
| launch_mass = {{convert|1825|kg|lb}}
| power =

| launch_date = {{start-date|8 May 2003, 11:28|timezone=yes}} UTC<ref name="launchlog">{{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|first=Jonathan|last=McDowell|work=Jonathan's Space Page|access-date=30 October 2013}}</ref>
| launch_rocket = [[Geosynchronous Satellite Launch Vehicle|GSLV Mk.I]] D2
| launch_site = [[Satish Dhawan Space Centre|Sriharikota]] [[Satish Dhawan Space Centre First Launch Pad|FLP]]
| launch_contractor = [[Indian Space Research Organisation|ISRO]]
| entered_service =

| disposal_type =
| deactivated = 

| orbit_epoch = 29 October 2013, 19:06:36 UTC<ref name="n2yo">{{cite web|url=http://www.n2yo.com/satellite/?s=27807|title=GSAT 2 Satellite details 2003-018A NORAD 27807|work=N2YO|date=29 October 2013|access-date=30 October 2013}}</ref>
| orbit_reference = [[geocentric orbit|Geocentric]]
| orbit_regime = [[geostationary orbit|Geostationary]]
| orbit_periapsis = {{convert|35904|km|mi}}
| orbit_apoapsis = {{convert|35920|km|mi}}
| orbit_inclination = 2.43 degrees
| orbit_period = 24.03 hours
| orbit_longitude = 47.95° east
| apsis = gee

| trans_band =
| trans_frequency =
| trans_bandwidth =
| trans_capacity =
| trans_coverage =
| trans_TWTA =
| trans_EIRP =
| trans_HPBW =
| programme = [[GSAT]]
| previous_mission = [[GSAT-1]]
| next_mission = [[GSAT-3]]
}}
'''GSAT-2''' was an experimental communication satellite built by the [[Indian Space Research Organisation]] (ISRO) and launched on one of the first [[Geosynchronous Satellite Launch Vehicle|GSLV]]s. The satellite was positioned at [[48th meridian east|48 deg east]] longitude in the [[Geostationary orbit|geo-stationary orbit]].

==Payloads==
GSAT-2 carried four C-band transponders, two K<sub>u</sub> band transponders and a Mobile Satellite Service (MSS) payload operating in S-band forward link and C-band return link. Besides the communication payloads, GSAT-2 carried the following four piggyback experimental payloads:
*Total Radiation Dose Monitor (TRDM) to compare the estimated radiation doses inside the satellite with the directly measured radiation doses using a Radiation Sensitive Field Effect Transistor (RADFET)
*Surface Charge Monitor (SCM) to indicate the state of the charging environment in the vicinity of the spacecraft
*[[SOXS|Solar X-ray Spectrometer]] (SOXS) to study the solar flare emission in 4 keV - 60 keV<ref>{{cite web |url=http://www.prl.res.in/~soxs-data |title=Solar X-Ray Spectrometer (SOXS) Home Page |access-date=2010-04-29 |url-status=dead |archive-url=https://web.archive.org/web/20160304031730/https://www.prl.res.in/~soxs-data/ |archive-date=2016-03-04 }}</ref> energy range using state of the art semiconductor devices and Phoswich Scintillation Detector
*Coherent Radio Beacon Experiment (CRABEX) to investigate the spatial structure, dynamic and temporal variations of Ionosphere and several aspects of equatorial electrodynamics

Weighing 1800 kg at launch, GSAT-2 incorporated a 440 [[Newton (unit)|newton]] Liquid Apogee Motor (LAM) and sixteen 22 newton Reaction Control Thrusters for raising the satellite's orbit from Geo-stationary Transfer orbit to its final geo- stationary orbit as well as for its [[Spacecraft attitude control|attitude control]]. It carried 840 kg of propellant ([[monomethyl hydrazine]] and [[Mixed Oxides of Nitrogen|MON-3]]).

==Measurements==
GSAT-2 measures 9.55 m in length in its final in-orbit configuration. It is 3-axis body stabilised using Sun and Earth sensors, momentum and reaction wheels, [[magnetic torquers]] and bi-propellant thrusters. Its solar array generates 1380 W power, backed up by two 24 [[ampere hour|A·h]] Ni-Cd batteries.

==Positioning==
After its launch into Geo-synchronous transfer orbit by [[GSLV]]-D2, GSAT-2 it was taken to its final geo-stationary orbit by firing the liquid apogee motor in phases. After it reached the geo-stationary orbit, its antenna and solar Panels were deployed and the satellite was finally placed in its allocated slot of 48° east longitude.

==See also==
{{Portal|Spaceflight}}
*[[List of Indian satellites]]

== References ==
{{reflist}}

==External links==
*[https://web.archive.org/web/20091012082826/http://www.isro.org/satellites/gsat-2.aspx ISRO: GSAT-2]

{{GSAT Satellites}}
{{Indian spacecraft}}
{{Orbital launches in 2003}}

[[Category:Communications satellites in geostationary orbit]]
[[Category:Spacecraft launched in 2003]]
[[Category:GSAT satellites]]
[[Category:2003 in India]]
[[Category:Spacecraft launched by GSLV rockets]]

GSAT-2 - Revision history

Ajay Kumar at 07:43, 2 September 2023