Template:Infobox spaceflight INSAT-4B is an Indian communications satellite which forms part of the Indian National Satellite System. Launched in 2007, it is operated in geostationary orbit at a longitude of 93.48° east.[1]
Built by the Indian Space Research Organisation, INSAT-4B is based upon the I-3K satellite bus. It had a mass at launch of Template:Convert, with a dry mass of Template:Convert and was expected to operate for twelve years. Two solar arrays power the satellite, while its communications payload consists of twelve C and twelve Template:Ku band transponders.[2]
Arianespace was contracted to launch INSAT-4B using an Ariane 5 ECA carrier rocket. The launch occurred on 11 March 2007 at 22:03 UTC, from ELA-3 at Kourou.[3] The Skynet 5A military communications satellite for the British Ministry of Defence was launched aboard the same rocket.
INSAT-4B was successfully inserted into geosynchronous transfer orbit, from which it raised itself into geostationary orbit using a liquid-fuelled apogee motor.[2] It received the International Designator 2007-007A and Satellite Catalog Number 30793.[4] As of 11 November 2013, it is in an orbit with a perigee of Template:Convert, an apogee of Template:Convert, inclination of 0.07 degrees and an orbital period of 23.93 hours.[5]
Partial power failure
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.[6] Similar partial power supply failure also affected Eutelsat W2M now known as Afghansat 1 and caused delay in launch of GSAT-8 due to required design changes in relevant power systems of satellite bus.[7][8]
Relocation
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.[9]
On 20 August 2019,[10] altitude of INSAT-4B was raised and it was relocated to new 83°E slot on 12 October 2019.[11]
On 15 February 2020, altitude of INSAT-4B was lowered and it was relocated to new 85.5°E slot on 20 February 2020.[12][13]
References
- ↑ UCS Satellite Database. Union of Concerned Scientists(1 September 2013). Retrieved 12 November 2013.
- ↑ 2.0 2.1 Insat 4A, 4B, Krebs, Gunter. Retrieved 12 November 2013.
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedlaunchlog - ↑ Satellite Catalog, McDowell, Jonathan. Retrieved 12 November 2013.
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedn2yo - ↑ My Odyssey: Memoirs of the Man behind the Mangalyaan Mission{{#if:Radhakrishnan|, Radhakrishnan}. Penguin UK(2016). ISBN 9385990381
- ↑ 'India losing satellites due to failure of imported components'. hindustantimes.com/(2010-07-11). Retrieved 2017-12-19.
- ↑ Report number 22 by Comptroller Auditor General. Retrieved 19 December 2017.
- ↑ Archived TLE data from Space-track.org. Retrieved 19 December 2017.
- ↑ Historical satellite position data for INSAT-4B for the month of August 2019 Jens T. Satre www.satellite-calculations.com. www.satellite-calculations.com. Retrieved 2019-10-12.
- ↑ Historical satellite position data for INSAT-4B for the month of October 2019 Jens T. Satre www.satellite-calculations.com. www.satellite-calculations.com. Retrieved 2019-10-12.
- ↑ Historical satellite position data for INSAT-4B for the month of February 2020 Jens T. Satre www.satellite-calculations.com. www.satellite-calculations.com. Retrieved 2020-02-20.
- ↑ Who will get ISRO's new capacity- Sun, Dish or Tata Sky?. Ultra News(2020-02-08). Retrieved 2020-02-20.
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