View source for Engineering:RISAT-2BR1

{{Short description|Indian Earth observation satellite}}
{{Use Indian English|date=October 2020}}
{{Infobox spaceflight
| name              = RISAT-2BR1
| names_list        = Radar Imaging Satellite-2BR1
| image             = RISAT-2BR1 with its Radial Rib Antenna deployed.png
| image_caption     = RISAT-2BR1 with its "Radial Rib Antenna" in deployed configuration.
| image_size        = 300px

| mission_type      = [[Astronomy:Earth observation satellite|Earth observation]]<br/>[[Imaging radar|Radar imaging satellite]]
| operator          = [[Astronomy:Indian Space Research Organisation|ISRO]]
| COSPAR_ID         = 2019-089F
| SATCAT            = 44857
| website           = https://www.isro.gov.in/
| mission_duration  = 5 years (planned)<br/>{{time interval|11 December 2019|show=ymd}} ''(in progress)''

| spacecraft        = RISAR-2BR1
| spacecraft_type   = 
| spacecraft_bus    = [[Engineering:RISAT|RISAT]]
| manufacturer      = [[Astronomy:Indian Space Research Organisation|Indian Space Research Organisation]]
| launch_mass       = {{cvt|615|kg}} <ref>{{cite web|title=PSLV-C48/RISAT-2BR1|url=https://www.isro.gov.in/launcher/pslv-c48-risat-2br1|access-date=5 December 2019|publisher=ISRO|archive-date=13 December 2019|archive-url=https://web.archive.org/web/20191213145007/https://www.isro.gov.in/launcher/pslv-c48-risat-2br1|url-status=dead}}</ref><ref name="C48_PK"/>
| dry_mass          = 
| dimensions        = 
| power             = 2 [[Watt|kW]]

| launch_date       = 11 December 2019, 09:55 [[Physics:Coordinated Universal Time|UTC]]
| launch_rocket     = [[Engineering:Polar Satellite Launch Vehicle|Polar Satellite Launch Vehicle]], PSLV-C48
| launch_site       = [[Astronomy:Satish Dhawan Space Centre|Satish Dhawan Space Centre]], [[Astronomy:Satish Dhawan Space Centre|First Launch Pad (FLP)]]
| launch_contractor = [[Astronomy:Indian Space Research Organisation|Indian Space Research Organisation]]

| entered_service   = March 2020
| disposal_type     = 
| deactivated       = 
| last_contact      = 

| orbit_reference   = [[Astronomy:Geocentric orbit|Geocentric orbit]]
| orbit_regime      = [[Astronomy:Low Earth orbit|Low Earth orbit]]
| orbit_periapsis   = {{cvt|555|km}}
| orbit_apoapsis    = {{cvt|555|km}}
| orbit_inclination = 37.0°
| orbit_period      = 90.0 minutes
| apsis             = gee

| instruments       = [[Engineering:Synthetic-aperture radar|Synthetic Aperture Radar]] ([[Physics:X band|X-band]]) (SAR-X)

| programme         = [[Astronomy:Earth observation satellite|Earth observation satellites series]]
| previous_mission  = Cartosat-3
| next_mission      = [[Astronomy:EOS-01|RISAT-2BR2 (EOS-01)]]
}}

'''RISAT-2BR1''' is a [[Engineering:Synthetic-aperture radar|synthetic-aperture radar]] (SAR) [[Astronomy:Earth observation satellite|imaging satellite]] built by [[Astronomy:Indian Space Research Organisation|Indian Space Research Organisation]] (ISRO). It is part of India's [[Engineering:RISAT|RISAT]] series of SAR imaging satellite and fourth satellite in the series. RISAT-2BR1 was launched on 11 December 2019 at 09:55 [[Physics:Coordinated Universal Time|UTC]] aboard [[Engineering:Polar Satellite Launch Vehicle|Polar Satellite Launch Vehicle]] PSLV-C48 from First Launch Pad (FLP) of [[Astronomy:Satish Dhawan Space Centre|Satish Dhawan Space Centre]].<ref name=":0">{{cite web|url=https://www.isro.gov.in/update/11-dec-2019/press-release-pslv-successfully-launches-risat-2br1-and-nine-commercial|title=PSLV successfully launches RISAT-2BR1 and nine commercial satellites in its fiftieth flight|website=isro.gov.in|publisher=ISRO|date=11 December 2019|access-date=12 December 2019|archive-date=12 December 2019|archive-url=https://web.archive.org/web/20191212093323/https://www.isro.gov.in/update/11-dec-2019/press-release-pslv-successfully-launches-risat-2br1-and-nine-commercial|url-status=dead}}</ref><ref>{{cite web |url=https://www-news18-com.cdn.ampproject.org/v/s/www.news18.com/amp/news/india/with-few-hours-left-for-launch-of-isros-risat-2br1-heres-all-you-need-to-know-about-the-spy-satellite-2419867.html?usqp=mq331AQCKAE=&amp_js_v=0.1|title=ISRO's RISAT-2BR1, 9 Other Foreign Satellites Blast Off from Sriharikota|website=news18.com|publisher=News18|access-date=2019-12-11}}</ref> It was the 50th launch of Polar Satellite Launch Vehicle and 75th launch from Satish Dhawan Space Centre.<ref>{{cite news|url=https://timesofindia.indiatimes.com/india/isro-to-launch-another-eye-in-the-sky-risat-2br1-on-dec-11-will-help-boost-border-surveillance/articleshow/72340281.cms|title=ISRO to launch another "eye in the sky" Risat-2BR1 on 11 December 2019, will help boost border surveillance|newspaper=The Times of India |last=Singh|first=Surendra|date=3 December 2019 |access-date=2019-12-04}}</ref><ref>{{cite news|url=https://www.business-standard.com/article/current-affairs/isro-to-launch-border-surveillance-satellite-risat-2br1-on-dec-11-119120301040_1.html|title=ISRO to launch border surveillance satellite Risat-2BR1 on December 11|publisher=Business Standard India|date=3 December 2019|access-date=2019-12-04}}</ref>

== Overview ==
The RISAT-2BR1 is follow on to [[Engineering:RISAT-2B|RISAT-2B]] and has an [[Physics:X band|X-band]] SAR with unfurlable radial rib reflector antenna of 3.6 meter diameter.<ref>{{cite web|url=https://www.isro.gov.in/update/22-may-2019/risat-2b-radial-rib-antenna|title=RISAT-2B - Radial Rib Antenna|website=isro.gov.in|publisher=ISRO|access-date=2019-12-04|archive-date=29 May 2019|archive-url=https://web.archive.org/web/20190529104039/https://www.isro.gov.in/update/22-may-2019/risat-2b-radial-rib-antenna|url-status=dead}}</ref> RISAT-2BR1 can operate in different modes including Very High Resolution imaging modes of 1 x 0.5 m resolution and 0.5 x 0.3 m resolution <ref>{{cite web|url=http://164.100.158.235/question/annex/249/Au1531.pdf|title=Rajya Sabha Unstarred Question No. 1531 - Earth Observation satellite RISAT-2B|date=4 July 2019|access-date=4 July 2019}}</ref> with swath of 5 to 10 km.<ref>{{cite web|url=https://www.moneycontrol.com/news/science/isro-to-launch-second-spy-satellite-risat-2br1-on-december-11-to-enhance-indias-surveillance-capability-4695061.html|title=ISRO to launch second "spy" satellite RISAT-2BR1 on 11 December 2019 to enhance India's surveillance capability|date=3 December 2019 |publisher=Moneycontrol |access-date=2019-12-04}}</ref> 

* Mass: {{cvt|628|kg}} <ref>{{cite web|url=https://www.isro.gov.in/Spacecraft/risat-2br1|title=RISAT-2BR1|website=isro.gov.in|publisher=ISRO|access-date=2019-12-12}}</ref>
* Orbit: {{cvt|557|km}} (circular) at inclination of 37.0° <ref name="C48_PK">{{cite web|url=https://www.isro.gov.in/sites/default/files/flipping_book/pslv-c48risat-2br1_missionr/files/assets/common/downloads/PSLV-C48RISAT-2BR1%20Mission.pdf|title=PSLV C48 Press kit|date=5 December 2019|archive-url=https://web.archive.org/web/20191210055319/https://www.isro.gov.in/sites/default/files/flipping_book/pslv-c48risat-2br1_missionr/files/assets/common/downloads/PSLV-C48RISAT-2BR1%20Mission.pdf|archive-date=10 December 2019|access-date=5 December 2019}}</ref>
* Mission life: 5 years <ref name="C48_PK"/>

== Launch ==
RISAT-2BR1 was launched aboard PSLV-C48 on 11 December 2019 at 09:55 UTC with nine other ride-sharing commercial satellites from [[Astronomy:Satish Dhawan Space Centre First Launch Pad|First Launch Pad]] of Satish Dhawan Space Centre, SHAR. Launch vehicle used was -QL variant of [[Engineering:Polar Satellite Launch Vehicle|Polar Satellite Launch Vehicle]] with four PSOM-XL strap-ons and employed a 195 kg Dual Launch Adapter (DLA) to accommodate primary and secondary payloads. After a flight of 16 minutes 27 seconds, RISAT-2BR1 was separated from PSLV fourth stage (PS4) and injected into 576 km circular orbit with 37.0° inclination. After primary payload, DLA and subsequently nine other co-passenger satellites were separated. RISAT-2BR1 deployed it [[Physics:Solar panels on spacecraft|solar panels]] within 3 minutes after separation and deployed its 3.6 meter antenna on 08:30 UTC, on 12 December 2019.<ref>{{cite web|url=https://www.isro.gov.in/update/12-dec-2019/radial-rib-antenna-of-risat-2br1-deployed-successfully|title=Radial Rib Antenna of RISAT-2BR1 deployed successfully |website=isro.gov.in|publisher=ISRO|access-date=2019-12-12}}</ref><ref name=":0"/>

=== Secondary payloads ===
Nine commercial ridesharing satellites weighed 157.6 kg cumulatively.<ref name="C48_PK"/><ref>{{cite web|url=https://www.isro.gov.in/sites/default/files/319_satellites_list.pdf|title=List of International Customer Satellites Launched by PSLV|publisher=ISRO}}</ref>

* QPS SAR-1 "Izanagi"「イザナギ」(~100 kg) [[Physics:X band|X-band]] SAR imaging satellite with 3.6 m antenna by [[Company:IQPS|iQPS]].<ref>{{cite web|url=https://i-qps.net/news/172|title=12月12日（木）小型SAR衛星「イザナギ」との初交信が成功しました！|date=12 December 2019 |publisher=iQPS Inc.|language=ja|access-date=2019-12-12}}</ref><ref>{{cite web|url=https://www.asahi.com/articles/ASM924CXSM92TIPE00X.html|title=福岡）ベンチャーが衛星公開 １０月にもインドで発射：朝日新聞デジタル|website=朝日新聞デジタル|date=2 September 2019 |language=ja|publisher=Asahi|access-date=2019-12-12}}</ref>

* Four [[Company:Spire Global|Lemur-2]] cubesats by [[Company:Spire Global|Spire Global]].<ref name="SFI_201910212">{{cite web|url=https://spaceflight.com/spaceflight-announces-next-three-rideshare-missions-on-isros-pslv-slated-through-the-end-of-2019/|title=Spaceflight Announces Next Three Rideshare Missions on ISRO's PSLV, Slated Through the End of 2019|publisher=Spaceflight|date=21 October 2019|access-date=29 November 2019}}</ref>

* Duchifat-3 (2.3 kg) by Sha'ar Hanegev High School students built at Herzliya Science Center.<ref>{{cite web|url=https://www.hayadan.org.il/duchifat-3-satellite-will-be-launched-in-two-weeks-from-india-0112191 |title=הלוויין דוכיפת 3 ישוגר בעוד כשבועיים מהודו|date=2019-11-30|website=הידען|language=he-IL|access-date=1 December 2019}}</ref>

* 1HOPSAT (22 kg) high resolution video and imaging satellite by Hera systems for Seguritech of Mexico.<ref>{{cite web|url=https://seguritech.com/prensa/lanzan-primer-satelite-enfocado-para-videovigilancia-en-mexico/|title=Lanzan primer satélite enfocado para videovigilancia en México|publisher=Seguritech|language=es-MX|access-date=2019-12-12}}</ref>

* [[Company:Tyvak|Tyvak-0129]] (11 kg) <ref>{{cite web|url=https://space.skyrocket.de/doc_sdat/pathfinder-risk-reduction.htm|title=Pathfinder Risk Reduction (Tyvak 0129)|website=space.skyrocket.de|access-date=2020-01-15}}</ref><ref>{{cite web|url=https://news.lockheedmartin.com/2020-01-16-Lockheed-Martin-Launches-First-Smart-Satellite-Enabling-Space-Mesh-Networking|title=Lockheed Martin Launches First Smart Satellite Enabling Space Mesh Networking - January 16, 2020|publisher=Lockheed Martin|access-date=2020-01-22}}</ref>

* [[Company:Tyvak|Tyvak-0092]] (5 kg) (NANOVA) <ref>{{cite web|url=https://www.israeldefense.co.il/he/node/41316|title=אלביט שיגרה לחלל ננו-לוויין ליישומי תקשורת|website=israeldefense.co.il|date=18 December 2019 |language=he|publisher=Israel Defense|access-date=2019-12-18}}</ref>

== See also ==
* [[Astronomy:List of Indian satellites|List of Indian satellites]]

== References ==
{{Reflist}}

{{Indian spacecraft}}

[[Category:Space synthetic aperture radar]]

{{Sourceattribution|RISAT-2BR1}}