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INSAT-4B

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INSAT-4B
Mission typeCommunications
OperatorINSAT
COSPAR ID2007-007AEdit this at Wikidata
SATCATno.30793
Mission durationPlanned: 12 years
Duration: 14 years, 10 months, 13 days
Spacecraft properties
BusI-3K
ManufacturerISRO
Launch mass3,028 kilograms (6,676 lb)
Dry mass1,335 kilograms (2,943 lb)
Power5,859W[1]
Start of mission
Launch date11 March 2007, 22:03(2007-03-11UTC22:03Z)UTC[2]
RocketAriane 5ECA
Launch siteKourouELA-3
ContractorArianespace
End of mission
DisposalGraveyard orbit
Deactivated24 January 2022(2022-01-25)[3]
Orbital parameters
Reference systemGeocentric
RegimeGeostationary
Longitude85.5° E (relocated on 20 Feb 2020)

83° E (relocated on 12 Oct 2019)
111.2° E (relocated on 18 Dec 2017)

93.48° E (till 11 Nov 2017)
Semi-major axis42,163.57 kilometres (26,199.23 mi)
Eccentricity0.0003909
Perigee altitude35,776 kilometres (22,230 mi)
Apogee altitude35,809 kilometres (22,251 mi)
Inclination0.07 degrees
Period23.93 hours
Epoch11 November 2013, 22:16:22 UTC[4]

INSAT-4Bwas an Indiancommunications satellitewhich forms part of theIndian National Satellite System.Launched in 2007, it was placed ingeostationary orbitat a longitude of 93.48° East.[5]

Built by theIndian Space Research Organisation,INSAT-4B is based upon theI-3Ksatellite bus.It had a mass at launch of 3,028 kilograms (6,676 lb), with a dry mass of 1,335 kilograms (2,943 lb) and was expected to operate for twelve years. Twosolar arrayspower the satellite, while its communications payload consists of twelveCand twelveKubandtransponders.[6]

Arianespacewas contracted to launch INSAT-4B using anAriane 5 ECAcarrier rocket. The launch occurred on 11 March 2007 at 22:03 UTC, fromELA-3atKourou.[2]TheSkynet 5Amilitary communications satellite for the BritishMinistry of Defencewas launched aboard the same rocket.

INSAT-4B was successfully inserted intogeosynchronous transfer orbit,from which it raised itself into geostationary orbit using a liquid-fuelledapogee motor.[6]It received theInternational Designator2007-007A andSatellite Catalog Number30793.[7]As of 11 November 2013, it is in an orbit with aperigeeof 35,776 kilometres (22,230 mi), anapogeeof 35,809 kilometres (22,251 mi),inclinationof 0.07 degrees and anorbital periodof 23.93 hours.[4]

Partial power failure[edit]

On 10 July 2010 INSAT-4B suffered a disruption in power supply from one of the two solar panels, rendering half of its transponder capacity useless. After review the cause of malfunction was found out to be electric arcing in slip ring of one of the solar panels.[8]Similar partial power supply failure also affected Eutelsat W2M now known asAfghansat 1and caused delay in launch ofGSAT-8due to required design changes in relevant power systems of satellite bus.[9][10]

Relocation[edit]

On 11 November 2017, INSAT-4B maneuvered to lower its altitude and drifted eastward to reach new slot at 111.2°E on 18 December 2017.[11]

On 20 August 2019,[12]altitude of INSAT-4B was raised and it was relocated to new 83°E slot on 12 October 2019.[13]

On 15 February 2020, altitude of INSAT-4B was lowered and it was relocated to new 85.5°E slot on 20 February 2020.[14][15]

Decommissioning[edit]

Towards the end of its life INSAT-4B was placed inGraveyard orbitunder post mission disposal procedure and subsequently decommissioned on 24 January 2022, in accordance with the space debris mitigation guidelines recommended by UN and theInter Agency Space Debris Coordination Committee(IADC).[3]

References[edit]

  1. ^"INSAT-4B".ISRO.7 February 2022. Archived fromthe originalon 7 February 2022.Retrieved7 February2022.
  2. ^abMcDowell, Jonathan."Launch Log".Jonathan's Space Page.Retrieved12 November2013.
  3. ^ab"Successful post mission disposal of INSAT-4B Satellite - ISRO".isro.gov.in.Archived fromthe originalon 2022-02-07.Retrieved2022-02-07.
  4. ^ab"INSAT 4B Satellite details 2007-007A NORAD 30793".N2YO.11 November 2013.Retrieved12 November2013.
  5. ^"UCS Satellite Database".Union of Concerned Scientists. 1 September 2013. Archived fromthe originalon 4 January 2014.Retrieved12 November2013.
  6. ^abKrebs, Gunter."Insat 4A, 4B".Gunter's Space Page.Retrieved12 November2013.
  7. ^McDowell, Jonathan."Satellite Catalog".Jonathan's Space Page.Retrieved12 November2013.
  8. ^Radhakrishnan, Koppillil (2016).My Odyssey: Memoirs of the Man behind the Mangalyaan Mission.Penguin UK. p. 190.ISBN978-9385990380.
  9. ^"'India losing satellites due to failure of imported components'".hindustantimes /.2010-07-11.Retrieved2017-12-19.
  10. ^"Management of satellite capacity for DTH service by Department of Space (Report number 22 by Comptroller Auditor General)"(PDF).2014.Retrieved5 March2023.
  11. ^"Archived TLE data from Space-track.org".Retrieved19 December2017.
  12. ^"Historical satellite position data for INSAT-4B for the month of August 2019 Jens T. Satre satellite-calculations".satellite-calculations.Retrieved2019-10-12.
  13. ^"Historical satellite position data for INSAT-4B for the month of October 2019 Jens T. Satre satellite-calculations".satellite-calculations.Retrieved2019-10-12.
  14. ^"Historical satellite position data for INSAT-4B for the month of February 2020 Jens T. Satre satellite-calculations".satellite-calculations.Retrieved2020-02-20.
  15. ^"Who will get ISRO's new capacity- Sun, Dish or Tata Sky?".Ultra News.2020-02-08. Archived fromthe originalon 2020-02-20.Retrieved2020-02-20.
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