INSAT-4A spacecraft in deployed configuration
Mission typeCommunications
COSPAR ID2005-049A Edit this at Wikidata
SATCAT no.28911
WebsiteINSAT 4A
Mission durationPlanned: 12 years
Achieved: 13 years, 9 months, 29 days
Spacecraft properties
Launch mass3,081 kilograms (6,792 lb)
Dry mass1,386 kilograms (3,056 lb)[1]
Dimensions2.8 x 1.7 x 2.0 m
Power5,922 watts
Start of mission
Launch date21 December 2005, 22:33 (2005-12-21UTC22:33Z) UTC
RocketAriane 5GS
Launch siteKourou ELA-3
End of mission
DisposalMoved to a graveyard orbit
Deactivated21 October 2019 (2019-10-22)[2]
Orbital parameters
Reference systemGeocentric
Slot83° East (0°N 83°E / 0°N +83°E / 0; +83)
Period24 hours
Band12 Ku band
12 C-band
Bandwidth36 megahertz
TWTA power140 & 63 watts
EIRP51 & 38 dbW

INSAT-4A was the first one in the INSAT-4 Satellites series, providing services in the Ku and C band frequency bands. At the time of launch, it was the heaviest satellite India had produced. The Ku transponders cover the Indian main land and C-Band transponders cover an extended area. It has a dozen Ku transponders and another dozen of C-band transponders. This spacecraft was placed at 83°E along with INSAT-2E and INSAT-3B, by Ariane launch vehicle (ARIANE5-V169).[3][4][5][6]


INSAT-4A was a communication satellite intended for providing high quality television, telecommunication, broadcasting services and was the first satellite to be launched in the INSAT-4 series.


INSAT-4A was launched by an Ariane 5, produced by Arianespace, on 21 Dec 2005 at 22.33 UTC[7][8] from Kourou, French Guiana. It was placed into a Geosynchronous Transfer Orbit (GTO), 30 minutes after lift-off in 3-axis stabilized mode, with a perigee of 859 km and an apogee of 36,055 km. Its co-passenger on board was Meteosat-9 of EUMETSAT.


End Of Life and Replacement

The satellite was placed in the graveyard orbit on 21 October 2019 after almost 14 years in service.[2] A replacement satellite GSAT-30 was launched on 21:05 UTC, 16 January 2020 aboard Ariane 5 VA251.[9][10]


  1. ^ "Salient features of INSAT-4A". Archived from the original on 28 October 2019. Retrieved 28 October 2019.
  2. ^ a b "Historical satellite position data for INSAT-4A for the month of October 2019". Retrieved 28 October 2019.
  3. ^ "Insat 4A, 4B".
  4. ^ "Insat-4A - Isro". Archived from the original on 2015-09-27. Retrieved 2017-01-29.
  5. ^ "SALIENT FEATURES OF INSAT-4A". Archived from the original on 15 September 2015. Retrieved 2020-01-16.
  6. ^ "Space India, October 2005 - March 2006" (PDF).
  7. ^ "Ariane: 5 for 5 in 2005, Successful launch of Insat 4A and MSG-2". Arianespace. Retrieved 2022-12-20.
  8. ^ "INSAT-4A Launched Successfully". 2006-05-07. Archived from the original on 2006-05-07. Retrieved 2022-12-20.((cite web)): CS1 maint: bot: original URL status unknown (link)
  9. ^ "Press Release: India's communication satellite GSAT-30 launched successfully - ISRO". Archived from the original on 2020-05-30. Retrieved 2020-01-16.
  10. ^ "Flight VA251 – first Arianespace mission of 2020 a success: EUTELSAT KONNECT and GSAT-30 in orbit". Arianespace. Retrieved 2020-01-16.