Ajay Kumar at 09:43, 2 September 2023

2023-09-02T09:43:44Z

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{{Short description|Indian radar imaging satellite}}
{{Use Indian English|date=May 2021}}
{{Use dmy dates|date=May 2021}}
{{Infobox spaceflight
| name = EOS-04
| names_list = Radar Imaging Satellite-1A
| image = PSLV-C52, EOS-04 (aka RISAT-1A) - Spacecraft EOS-04 atop launch vehicle before encapsulation.jpg
| image_caption = EOS-04 Satellite
| image_size = 300px
| mission_type = [[Imaging radar]]
| operator = [[Indian Space Research Organisation|ISRO]]
| COSPAR_ID = 2022-013A
| SATCAT = 51656
| website = {{url|https://www.isro.gov.in/launcher/pslv-c52-eos-04-mission}}
| mission_duration = 10 years (planned)<ref name="PSLV-C52_PressKit"/><br/>{{time interval|14 February 2022 00:29|show=ymd|sep=,}} ''(in progress)''
| spacecraft = EOS-04
| spacecraft_type =
| spacecraft_bus =
| manufacturer = [[Indian Space Research Organisation]]
| launch_mass = {{cvt|1710|kg}}<ref name="PSLV-C52_PressKit">{{cite web |title=PSLV-C52/EOS-04 Mission |url=https://www.isro.gov.in/sites/default/files/pslv-c52-eos-04-v4.pdf |access-date=9 February 2022 |archive-url=https://web.archive.org/web/20220209151906/https://www.isro.gov.in/sites/default/files/pslv-c52-eos-04-v4.pdf |archive-date=9 February 2022}}</ref>
| dry_mass = 
| dimensions = 
| power = 2280 [[watt]]s<ref name="PSLV-C52_PressKit"/>
| launch_date = 14 February 2022, 00:29 [[Coordinated Universal Time|UTC]]
| launch_rocket = [[PSLV-C52]]
| launch_site = [[Satish Dhawan Space Centre]], [[Satish Dhawan Space Centre|First Launch Pad (FLP)]]
| launch_contractor = [[Indian Space Research Organisation]]
| entered_service =
| disposal_type =
| deactivated =
| last_contact =
| orbit_reference = [[Geocentric orbit]]<ref name="ISRO-C52"/>
| orbit_regime = [[Sun-synchronous orbit]]
| orbit_periapsis = {{cvt|526.7|km}}
| orbit_apoapsis = {{cvt|543.4|km}}
| orbit_inclination = 97.6°
| orbit_period = 95.2 minutes
| apsis = gee

| instruments = [[Synthetic-aperture radar|Synthetic Aperture Radar]] ([[C band (IEEE)|C-band]]) (SAR-C)
| programme = '''[[Earth observation satellite|Earth observation satellites series]]'''
| previous_mission = [[EOS-01|RISAT-2BR2 (EOS-01)]]
| next_mission =
}}

'''EOS-04''' or '''Earth Observation Satellite - 04''' (formerly known as RISAT-1A) is an [[Indian Space Research Organisation]] [[Imaging radar|Radar Imaging Satellite]] designed to provide high quality images under all weather conditions for applications such as Agriculture, Forestry & Plantations, Soil Moisture & Hydrology and Flood mapping.<ref>{{Cite web|title=EOS-04 - ISRO|url=https://www.isro.gov.in/Spacecraft/eos-04|access-date=2022-02-17|website=www.isro.gov.in|archive-date=20 March 2022|archive-url=https://web.archive.org/web/20220320005614/https://www.isro.gov.in/Spacecraft/eos-04|url-status=dead}}</ref><ref name="ceos_1">{{cite web|url=http://ceos-sysdb.com/CEOS/db/db_instrument_low_level.php?id=790|title=CEOS Instrument: Synthetic Aperature Radiometer (RISAT)|access-date=February 9, 2016|archive-date=9 February 2017|archive-url=https://web.archive.org/web/20170209121816/http://ceos-sysdb.com/CEOS/db/db_instrument_low_level.php?id=790|url-status=dead}}</ref> It is a follow on to [[RISAT-1]] satellite with similar configuration. The satellite is developed by the ISRO and it is sixth in series of [[RISAT]] satellites.

== Satellite description ==
Synthetic aperture radar can be used for [[Earth observation satellite|Earth observation]] irrespective of the light and weather conditions of the area being imaged.<ref name="hindu-risat1radar">{{cite news |url=http://www.thehindu.com/sci-tech/technology/article3350204.ece|title=RISAT-1's radar can see through clouds and work in darkness|newspaper=The Hindu|date=25 April 2012|location=Chennai, India|first=N. Gopal|last=Raj}}</ref> It complements/supplements data from [[Resourcesat-2|Resourcesat]], [[Cartosat]] and [[RISAT-2B]] Series.<ref name=":0">{{Cite web|title=PSLV-C52/EOS-04 Brochure - ISRO|url=https://www.isro.gov.in/pslv-c52-eos-04-mission/pslv-c52-eos-04-brochure|access-date=2022-02-17|website=www.isro.gov.in|archive-date=9 February 2022|archive-url=https://web.archive.org/web/20220209140030/https://www.isro.gov.in/pslv-c52-eos-04-mission/pslv-c52-eos-04-brochure|url-status=dead}}</ref> The satellite carries a [[C band (IEEE)|C-band]] [[synthetic-aperture radar]] (SAR) and has a liftoff mass of {{cvt|1710|kg}}.<ref name="ISRO-C52">{{cite web|url=https://www.isro.gov.in/launcher/pslv-c52-eos-04-mission|title=PSLV-C52/EOS-04 Mission|access-date=9 February 2022|publisher=ISRO|archive-date=9 February 2022|archive-url=https://web.archive.org/web/20220209012447/https://www.isro.gov.in/launcher/pslv-c52-eos-04-mission|url-status=dead}}</ref> The EOS-04 orbit is polar and sun-synchronous at 06:00 AM LTDN, at approximate altitude of 529 km.<ref name="UIM2016">{{cite web|last=Reddy|first=O.V. Raghav|date=3 February 2016|title=Future Earth Observation Missions of ISRO, NRSC User Interaction Meet 2016|url=http://nrsc.gov.in/sites/all/pdf/modnrscUIM%20_Raghava%20Reddy_1.pdf|url-status=dead|archive-url=https://web.archive.org/web/20170203144958/http://nrsc.gov.in/sites/all/pdf/modnrscUIM%20_Raghava%20Reddy_1.pdf|archive-date=3 February 2017}}</ref>

Assembly Integration and Testing of spacecraft was done by a consortium led by Alpha Design technologies Ltd.<ref>{{Cite web|author=Chethan Kumar|date=Feb 15, 2022|title=isro: Consortium led by Adani-backed firm assembled, integrated and tested Isro's earth observation satellite {{!}} India News - Times of India|url=https://timesofindia.indiatimes.com/india/consortium-led-by-adani-backed-firm-assembled-integrated-and-tested-isros-earth-observation-satellite/articleshow/89575752.cms|access-date=2022-02-15|website=The Times of India|language=en}}</ref> Approximate cost of EOS-04 is {{INRConvert|490|c|year=2021}}.<ref>{{Cite web |date=30 March 2022 |title=Lok Sabha Unstarred Question No. 4446, Observation Satellite EOS-4 |url=http://164.100.24.220/loksabhaquestions/annex/178/AU4446.pdf |quote=The total time taken to realize the satellite is 63 months from date of financial sanction and the expenditure towards realization of satellite is nearly Rs. 490 crore.}}</ref><ref>{{Cite web|date=December 1, 2021|first=Chethan|last=Kumar|title=Teething troubles with indigenous tech cause for delay in 2 Sat launches; humidity halts SSLV - Times of India|url=https://timesofindia.indiatimes.com/home/science/teething-troubles-with-indigenous-tech-cause-for-delay-in-2-sat-launches-humidity-halts-sslv/articleshow/88037127.cms|access-date=2022-02-15|website=The Times of India|language=en}}</ref>

== Launch ==
EOS-04 was launched on the [[Polar Satellite Launch Vehicle]] (PSLV-C52) from First Launch Pad(FLP), [[Satish Dhawan Space Centre|SDSC, SHAR]], Sriharikota at 05:59 hrs [[Indian Standard Time|IST]] (00:29 hrs [[Coordinated Universal Time|UTC]]) on 14 February 2022.<ref name=":0" /><ref name=":1">{{Cite web|title=Successful launch of PSLV-C52 with EOS-04 Satellite - ISRO|url=https://www.isro.gov.in/update/14-feb-2022/successful-launch-of-pslv-c52-with-eos-04-satellite|access-date=2022-02-15|website=www.isro.gov.in|archive-date=17 February 2022|archive-url=https://web.archive.org/web/20220217170646/https://www.isro.gov.in/update/14-feb-2022/successful-launch-of-pslv-c52-with-eos-04-satellite|url-status=dead}}</ref><ref>{{cite web|title=14న పీఎస్‌ఎల్‌వీ ప్రయోగం |url=https://www.eenadu.net/telugu-news/india/general/0702/122019336|access-date=2022-01-28|website=EENADU |language=te}}</ref> It was launched along with two [[Secondary payload|ridesharing satellites]], INS-2TD a technology demonstrator by ISRO and INSPIREsat-1 a university satellite.<ref name=":1" />

EOS-04 captured first images on 25 February 2022 after launch.<ref>{{Cite web |title=EOS-04, INS-2TD and INSPIRESat-1: Update - ISRO |url=https://www.isro.gov.in/update/26-mar-2022/eos-04-ins-2td-and-inspiresat-1-update |access-date=2022-03-30 |website=www.isro.gov.in}}</ref>
{{Clear}}

== See also ==
{{Portal|Spaceflight}}
* [[RISAT]]
* [[PSLV]]

== References ==
{{Reflist|30em}}

{{PSLV}}
{{RISAT satellites}}
{{Indian spacecraft}}
{{Rest of the World Reconnaissance Satellites}}
{{Orbital launches in 2022}}

[[Category:Earth observation satellites of India]]
[[Category:Space synthetic aperture radar]]
[[Category:Spacecraft launched by India in 2022]]

{{India-spacecraft-stub}}

EOS-04 - Revision history

Ajay Kumar at 09:43, 2 September 2023