{{Short description|Series of Indian satellite buses}}

The '''INSAT Satellite Bus''' is a series of satellite buses that have been manufactured by the Indian Space Research Organisation and marketed by NewSpace India Limited. It consist of five different versions; ''I-1K, I-2K, I-3K, I-4K& I-6K.''<ref name=":0">{{Cite web |title=Communication Satellite Platform {{!}} NSIL |url=https://www.nsilindia.co.in/communication-satellite-platform |access-date=2025-08-24 |website=www.nsilindia.co.in}}</ref>

==I-1K== '''I-1K''' (also referred to as '''INSAT-1000''') is a satellite bus developed by the Indian Space Research Organisation (ISRO) and marketed by Antrix Corporation.<ref name="Antrix">{{cite web |url=http://www.antrix.gov.in/sss_systems.html |title=Spacecraft Systems and Subsystems |publisher=Antrix Corporation |date=2010 |accessdate=February 7, 2014 |archive-url=https://web.archive.org/web/20140220164322/http://www.antrix.gov.in/sss_systems.html |archive-date=February 20, 2014 |url-status=dead }}</ref> The I-1K bus is designed to be compatible with lightweight geostationary satellites and is commonly used for meteorological satellites.The IRS or ''Indian Remote Sensing Satellite'' bus are also built on I-1K.<ref name=":0" />

===Design=== * The I-1K bus can be used for satellites in the lightweight category, with a launch mass between {{convert|1050|and|1100|kg|lb}}. * Its dimensions are {{convert|1.505|x|1.476|x|1.530|m|ft|abbr=on}}. * I-1K's dry mass is {{convert|500|kg|lb|-1|abbr=on}} and can support payloads of {{convert|100|kg|lb|-1|abbr=on}}. * Its power systems can supply between 500 and 1000 watts.<ref name="antrix-i1k">{{cite web |url=http://www.antrix.gov.in/I-1K.pdf |title=INSAT 1000 spacecraft bus |publisher=Antrix Corporation |accessdate=December 30, 2013 |archive-url=https://web.archive.org/web/20150923172453/http://www.antrix.gov.in/I-1K.pdf |archive-date=September 23, 2015 |url-status=dead }}</ref> * The average transponder life is 7 years which can be extended up to 12 years.

===List of satellites launched using I-1K platform=== *Kalpana-1 *GSAT-12<ref>{{cite web |url=http://space.skyrocket.de/doc_sat/isro_i1k.htm |title=ISRO: I-1K (I-1000) Bus |work=Skyrocket.de |accessdate=December 30, 2013}}</ref> *IRNSS series (1A {{!}} 1B {{!}} 1C {{!}} 1D {{!}} 1E {{!}} 1F {{!}} 1G {{!}} 1H {{!}} 1I) *Chandrayaan-1 *Mars Orbiter Mission<ref name='specifications'>{{cite web |url=http://www.isro.org/mars/spacecraft.aspx |title=Mars Orbiter Spacecraft |publisher=ISRO |date=January 2014 |accessdate=November 6, 2013}}</ref> *Aditya-L1 Mission

==I-2K==

'''I-2K''' is a satellite bus developed by Indian Space Research Organisation (ISRO), and marketed by Antrix Corporation.<ref>{{Cite web |url=http://www.antrix.gov.in/sss_systems.html |title=Antrix Corporation Ltd - Satellites > Spacecraft Systems & Sub Systems |access-date=2013-12-19 |archive-url=https://web.archive.org/web/20140220164322/http://www.antrix.gov.in/sss_systems.html |archive-date=2014-02-20 |url-status=dead }}</ref> It is a standard bus for 2,000&nbsp;kg class satellites; the 'I' in I-2K stands for INSAT, a group of communication satellites developed and launched by ISRO. The satellite buses developed by ISRO are specifically developed for small and medium weight satellites. I-2K spacecraft bus can supply DC power up to 3000 watts.<ref>{{cite web | url=http://www.antrix.gov.in/sss_systems.html | title=SPACECRAFT SYSTEMS AND SUB SYSTEMS | publisher=Antrix Corporation | accessdate=December 19, 2013 | archive-url=https://web.archive.org/web/20140220164322/http://www.antrix.gov.in/sss_systems.html | archive-date=February 20, 2014 | url-status=dead }}</ref> I-2K platform is targeted towards satellites in liftoff mass in range of 1500–2500&nbsp;kg.<ref>{{cite web | url=http://www.isro.org/scripts/futureprogramme.aspx | title=Future Programmes | publisher=ISRO | accessdate=December 19, 2013}}</ref>

===Features of I-2K=== * Launch Mass: {{convert|2000|-|2300|kg|lb|abbr=on}}. * Dimensions: 1.65 * 1.53m in plan & 3.0m in height. * Dry Mass: {{convert|600|-|950|kg|lb|abbr=on}}. * Payload Mass: {{convert|160|-|200|kg|lb|abbr=on}}. * Total Power: 2800 W. * Payload Power: 2400 W. * Transponder: 12 - 18. * Mission Life: 12 - 15 Years.<ref>{{cite web |title=INSAT 2000 spacecraft bus |url=http://www.antrix.gov.in/I-2K.pdf |url-status=dead |archive-url=https://web.archive.org/web/20150923172459/http://www.antrix.gov.in/I-2K.pdf |archive-date=September 23, 2015 |access-date=December 19, 2013 |publisher=Antrix Corporation |pages=2}}</ref>

===List of satellites launched using I-2K platform=== * INSAT series (3B {{!}} 3C {{!}} 3D {{!}} 3DR {{!}} 3E {{!}} 4C {{!}} 4CR) * IRS series (1C {{!}} 1D {{!}} P3) * GSAT series (1 {{!}} 2 {{!}} 3 (EDUSAT) {{!}} 4 {{!}} 5P {{!}} 6 {{!}} 6A {{!}} 7 {{!}} 7A {{!}} 9<ref>{{cite web | url=http://www.scatmag.com/technical/techarticle_nov09.pdf | title=The Indian GSAT Satellites | work=ISRO | accessdate=December 19, 2013 | pages=5}}</ref> {{!}} 14<ref>{{cite web | url=http://space.skyrocket.de/doc_sat/isro_i2k.htm | title=ISRO: I-2K (I-2000) Bus | publisher=skyrocket.de | accessdate=December 19, 2013}}</ref> {{!}} 31<ref>{{cite web | url=https://www.isro.gov.in/Spacecraft/gsat-31 | title=ISRO: GSAT-31 | publisher=ISRO | accessdate=February 6, 2019 | archive-date=November 10, 2019 | archive-url=https://web.archive.org/web/20191110170747/https://www.isro.gov.in/Spacecraft/gsat-31 | url-status=dead }}</ref>) * HYLAS-1

==I-3K==

'''I-3K''' or the '''INSAT 3000''' is a satellite bus developed by Indian Space Research Organisation (ISRO), and marketed by Antrix Corporation and New Space India Ltd.<ref>{{Cite web|url=http://nsilindia.co.in/communication-satellite-platform|title=Communication Satellite Platform {{!}} NSIL|website=nsilindia.co.in|access-date=2020-01-17}}</ref><ref>{{Cite web |url=http://www.antrix.gov.in/sss_systems.html |title=Antrix Corporation Ltd - Satellites > Spacecraft Systems & Sub Systems |access-date=2014-01-05 |archive-url=https://web.archive.org/web/20140220164322/http://www.antrix.gov.in/sss_systems.html |archive-date=2014-02-20 |url-status=dead }}</ref> It is the standard bus for 3,000-kg class satellites; the 'I' in I-3K stands for INSAT, a group of communication satellites developed and launched by ISRO. The I-3K bus can supply DC power up to 6500 watts, and is suitable for satellites with lift-off mass in range of 3,000-3,400&nbsp;kg.<ref>{{Cite web |url=http://www.antrix.gov.in/I-3K.pdf |title=INSAT 3000 Spacecraft Bus |access-date=2014-01-05 |archive-url=https://web.archive.org/web/20150923172504/http://www.antrix.gov.in/I-3K.pdf |archive-date=2015-09-23 |url-status=dead }}</ref><ref>{{cite web|title=SPACECRAFT SYSTEMS AND SUB SYSTEMS|url=http://www.antrix.gov.in/sss_systems.html|publisher=Antrix - ISRO|accessdate=5 January 2014|archive-url=https://web.archive.org/web/20140220164322/http://www.antrix.gov.in/sss_systems.html|archive-date=20 February 2014|url-status=dead}}</ref><ref>{{cite news|title=Constrained cooperation|url=http://www.frontline.in/static/html/fl2115/stories/20040730004610500.htm|accessdate=5 January 2014|newspaper=Frontline|date=17 July 2004}}</ref>

===List of satellites launched using I-3K bus=== * Eutelsat W2M (Now Afghansat 1)<ref>{{cite web|title=ISRO: I-3K (I-3000) Bus|url=http://space.skyrocket.de/doc_sat/isro_i3k.htm|publisher=Space Skyrocket|accessdate=5 January 2014}}</ref><ref>{{cite news|title=EADS Astrium-ISRO alliance sealed First contract with Eutelsat for W2M satellite|url=https://spacenews.com/eads-astrium-isro-alliance-sealed-first-contract-with-eutelsat-for-w2m-satellite/|access-date=5 January 2014|newspaper=Space Ref|date=20 February 2006}}</ref> * INSAT series (4A {{!}} 4B) * GSAT series (8 {{!}} 10<ref>{{cite news|title=India's GSAT-10 Continues Checkout|url=http://spaceref.biz/2012/08/indias-gsat-10-continues-checkout.html|accessdate=5 January 2014|newspaper=Space Ref|date=17 August 2012|archive-date=15 March 2016|archive-url=https://web.archive.org/web/20160315035525/http://spaceref.biz/2012/08/indias-gsat-10-continues-checkout.html|url-status=dead}}</ref> {{!}} 16 {{!}} 15 {{!}} 18 {{!}} 19 {{!}} 17 {{!}} 24 {{!}} 29 {{!}} 30) * Chandrayaan-3 (Propulsion module)<ref>{{cite web|title=Chandrayaan-3 Landing Brochure |url=https://www.isro.gov.in/NSPD2024/assets/pdf/CH3%20Landing%20Brochure-Pagewise.pdf|access-date=February 23, 2025|website=ISRO}}</ref> * NISAR

==I-4K== '''I-4K''' is a satellite bus being developed by the Indian Space Research Organisation (ISRO).<ref name=autogenerated1>[http://www.isro.org/scripts/futureprogramme.aspx#Forth Indian Space Research Organisation - Current Programmes]</ref><ref>[http://www.sac.gov.in/SACSITE/GSAT-11.html GSAT-11] {{webarchive|url=https://web.archive.org/web/20140107071044/http://www.sac.gov.in/SACSITE/GSAT-11.html |date=2014-01-07 }}</ref> It will be a standard bus for {{cvt|4000|-|6500|kg}} class communication satellites.<ref>[http://space.skyrocket.de/doc_sat/isro_i4k.htm ISRO: I-3K (I-3000) Bus]</ref> The ''I'' in I-4K stands for INSAT, a group of communication satellites developed and launched by ISRO. The I-4K spacecraft bus can supply DC power of 10 to 15 kilowatts.<ref name=autogenerated1 /><ref>{{Cite web |url=http://www.isro.org/pdf/OutcomeBudget2011-12.pdf |title=Outcome Budget 2011-2012 |access-date=2014-02-07 |archive-url=https://web.archive.org/web/20120617050334/http://www.isro.org/pdf/OutcomeBudget2011-12.pdf |archive-date=2012-06-17 |url-status=dead }}</ref>

===List of satellites being developed with I-4K bus=== * GSAT series

==I-6K== '''I-6K''' is a Satellite bus developed by Indian Space Research Organisation (ISRO)<ref>{{cite web|url=https://www.isro.gov.in/Spacecraft/gsat-11-mission|title=GSAT-11 Mission - ISRO|website=www.isro.gov.in|access-date=2018-12-04|archive-date=2019-07-13|archive-url=https://web.archive.org/web/20190713093327/https://www.isro.gov.in/Spacecraft/gsat-11-mission|url-status=dead}}</ref> It will be a standard bus for {{cvt|4000|-|6500|kg}} class communication satellites;<ref>{{cite web|url=https://space.skyrocket.de/doc_sat/isro_i6k.htm|title=ISRO: I-6K (I-6000) Bus|website=space.skyrocket.de}}</ref> the ''I'' in I-6K stands for INSAT and 6 signifies that it can support satellites up to 6,000 kg in weight. The I-6K spacecraft bus can supply DC power of 10 to 15 kilowatts.

==See also== {{Portal |Spaceflight}} * Comparison of satellite buses *Indian Mini Satellite Bus {{Clear}}

==References== {{Reflist}}

==External links== * [https://web.archive.org/web/20140220164322/http://www.antrix.gov.in/sss_systems.html Antrix Corp. satellite subsystems] * [https://web.archive.org/web/20150923172504/http://www.antrix.gov.in/I-3K.pdf I-3K ISRO brochure]

{{ISRO Satellite Bus}}

Category:Satellite buses Category:ISRO