View source for GSAT-2

{{Short description|Communication Satellite built by ISRO}}
{{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&nbsp;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}}&nbsp;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           = <!-- {{end-date|[insert date here]}} -->

| orbit_epoch           = 29 October 2013, 19:06:36&nbsp;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&nbsp;degrees
| orbit_period          = 24.03&nbsp;hours
| orbit_longitude       = 47.95°&nbsp;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&nbsp;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&nbsp;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]]