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{{Infobox spaceflight
| name = INSAT-4B
| image =
| image_caption =
| mission_type = [[Communications satellite|Communications]]
| operator = [[INSAT]]
| COSPAR_ID = 2007-007A
| SATCAT = 30793
| mission_duration = Planned: 12 years <br/>Duration: {{time interval|11 March 2007|show=ymd|sep=,}}
| spacecraft_bus = [[I-3K]]
| manufacturer = [[Indian Space Research Organisation|ISRO]]
| launch_mass = {{convert|3028|kg|lb}}
| dry_mass = {{convert|1335|kg|lb}}
| power = [[watt]]s
| launch_date = {{start-date|11 March 2007, 22:03|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=12 November 2013}}</ref>
| launch_rocket = [[Ariane 5|Ariane 5ECA]]
| launch_site = [[Guiana Space Centre|Kourou]] [[ELA-3]]
| launch_contractor = [[Arianespace]]
| entered_service =
| disposal_type =
| deactivated = 
| orbit_epoch = 11 November 2013, 22:16:22 UTC<ref name="n2yo">{{cite web|url=http://www.n2yo.com/satellite/?s=30793|title=INSAT 4B Satellite details 2007-007A NORAD 30793|work=N2YO|date=11 November 2013|access-date=12 November 2013}}</ref>
| orbit_reference = [[Geocentric orbit|Geocentric]]
| orbit_regime = [[Geostationary orbit|Geostationary]]
| orbit_periapsis = {{convert|35776|km|mi}}
| orbit_apoapsis = {{convert|35809|km|mi}}
| orbit_inclination = 0.07 degrees
| orbit_semimajor = {{convert|42163.57|km|mi}}
| orbit_eccentricity = 0.0003909
| orbit_period = 23.93 hours
| orbit_longitude = 85.5° E (relocated on 20 Feb 2020)<br>
83° E (relocated on 12 Oct 2019)<br>
111.2° E (relocated on 18 Dec 2017)<br>
93.48° E (till 11 Nov 2017)
| apsis = gee
}}
'''INSAT-4B''' is an [[India]]n [[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.<ref name="UCS">{{cite web|url=http://www.ucsusa.org/assets/documents/nwgs/UCS_Satellite_Database_9-1-13.txt|title=UCS Satellite Database|publisher=Union of Concerned Scientists|date=1 September 2013|access-date=12 November 2013}}</ref>

Built by the [[Indian Space Research Organisation]], INSAT-4B is based upon the [[I-3K]] [[satellite bus]]. It had a mass at launch of {{convert|3028|kg}}, with a dry mass of {{convert|1335|kg}} and was expected to operate for twelve years. Two [[solar array]]s power the satellite, while its communications payload consists of twelve [[C band (IEEE)|C]] and twelve {{Ku band}} transponders.<ref name="gsp">{{cite web|url=http://space.skyrocket.de/doc_sdat/insat-4a.htm|title=Insat 4A, 4B|first=Gunter|last=Krebs|work=Gunter's Space Page|access-date=12 November 2013}}</ref>

[[Arianespace]] was contracted to launch INSAT-4B using an [[Ariane 5|Ariane 5 ECA]] carrier rocket. The launch occurred on 11 March 2007 at 22:03 UTC, from [[ELA-3]] at [[Guiana Space Centre|Kourou]].<ref name="launchlog"/> The [[Skynet 5A]] military communications satellite for the British [[Ministry of Defence (UK)|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]].<ref name="gsp"/> It received the [[International Designator]] 2007-007A and [[Satellite Catalog Number]] 30793.<ref name="satcat">{{cite web|url=http://planet4589.org/space/log/satcat.txt|title=Satellite Catalog|first=Jonathan|last=McDowell|work=Jonathan's Space Page|access-date=12 November 2013}}</ref> As of 11 November 2013, it is in an orbit with a [[apsis|perigee]] of {{convert|35776|km|mi}}, an [[apsis|apogee]] of {{convert|35809|km|mi}}, [[orbital inclination|inclination]] of 0.07 degrees and an [[orbital period]] of 23.93 hours.<ref name="n2yo"/>

== 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.<ref>{{Cite book|title=My Odyssey: Memoirs of the Man behind the Mangalyaan Mission|last=Radhakrishnan|first=Koppillil|publisher=Penguin UK|year=2016|isbn=9385990381|pages=190}}</ref> 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.<ref>{{Cite news|url=http://www.hindustantimes.com/india/india-losing-satellites-due-to-failure-of-imported-components/story-G4G7RDgXxSkqxdNIicgYkL.html|title='India losing satellites due to failure of imported components'|date=2010-07-11|work=hindustantimes.com/|access-date=2017-12-19|language=en}}</ref><ref>{{Cite web|url=http://saiindia.gov.in/sites/default/files/audit_report_files/Union_Compliance_Satellite_Capacity_DTH_Service_22_2014_chapter_2.pdf|title=Report number 22 by Comptroller Auditor General|access-date=19 December 2017}}</ref>

== 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.<ref>{{Cite web|url=https://www.space-track.org/|title=Archived TLE data from Space-track.org|access-date=19 December 2017}}</ref>

On 20 August 2019,<ref>{{Cite web|url=https://www.satellite-calculations.com/Satellite/getpositionhistory.php?30793?archive/2019/August/2019_August_|title=Historical satellite position data for INSAT-4B for the month of August 2019 Jens T. Satre www.satellite-calculations.com|website=www.satellite-calculations.com|access-date=2019-10-12}}</ref> altitude of INSAT-4B was raised and it was relocated to new 83°E slot on 12 October 2019.<ref>{{Cite web|url=https://www.satellite-calculations.com/Satellite/getpositionhistory.php?30793?archive/2019/October/2019_October_|title=Historical satellite position data for INSAT-4B for the month of October 2019 Jens T. Satre www.satellite-calculations.com|website=www.satellite-calculations.com|access-date=2019-10-12}}</ref>

On 15 February 2020, altitude of INSAT-4B was lowered and it was relocated to new 85.5°E slot on 20 February 2020.<ref>{{Cite web|url=https://www.satellite-calculations.com/Satellite/getpositionhistory.php?30793?archive/2020/February/2020_February_|title=Historical satellite position data for INSAT-4B for the month of February 2020 Jens T. Satre www.satellite-calculations.com|website=www.satellite-calculations.com|access-date=2020-02-20}}</ref><ref>{{Cite web|url=https://ultra.news/s-e/49603/who-will-get-isros-new-capacity-sun-dish-or-tata-sky|title=Who will get ISRO's new capacity- Sun, Dish or Tata Sky?|date=2020-02-08|website=Ultra News|language=en-US|access-date=2020-02-20}}</ref>

==References==

{{reflist}}

{{INSAT Satellites}}
{{Indian spacecraft}}
{{Orbital launches in 2007}}

[[Category:Spacecraft launched in 2007]]
[[Category:INSAT satellites]]
[[Category:2007 in India]]

INSAT-4B - Revision history

CleanupBot II at 01:25, 14 August 2023