RISAT-2B
{{Short description|Indian Earth observation satellite}}
{{Use British English|date=November 2020}}
{{Use dmy dates|date=November 2020}}
{{Infobox spaceflight
| name = RISAT-2B
| names_list = Radar Imaging Satellite-2B
| image =
| image_caption =
| image_size = 300px
| mission_type = Earth observation
Radar imaging satellite
disaster management)
| operator = ISRO
| COSPAR_ID = 2019-028A
| SATCAT = 44233
| website = https://www.isro.gov.in/
| mission_duration = 5 years (planned)
{{time interval|22 May 2019|show=ymd}} (in progress)
| spacecraft = RISAT-2B
| spacecraft_type =
| spacecraft_bus = RISAT
| manufacturer = Indian Space Research Organisation
| launch_mass = {{cvt|615|kg}}
| dry_mass =
| dimensions =
| power = 2000 watts
| launch_date = 22 May 2019, 00:00 UTC
| launch_rocket = Polar Satellite Launch Vehicle-CA PSLV-C46
| launch_site = Satish Dhawan Space Centre, First Launch Pad (FLP)
| launch_contractor = Indian Space Research Organisation
| entered_service = August 2019
| disposal_type =
| deactivated =
| last_contact =
| orbit_reference = Geocentric orbit
| orbit_regime = Sun-synchronous orbit
| orbit_altitude = {{cvt|555|km}}
| orbit_inclination = 37.0°
| orbit_period = 93.0 minutes
| apsis = gee
| instruments = Synthetic Aperture Radar (X-band) (SAR-X)
| programme = Earth observation satellites series
| previous_mission = Cartosat-2F
| next_mission = Cartosat-3
}}
RISAT-2B, or Radar Imaging Satellite-2B is an Indian radar reconnaissance satellite that is part of India's RISAT programme and the third satellite in the series. It is built by Indian Space Research Organisation (ISRO) to replace RISAT-2.
Overview
RISAT-2B satellites will succeed India's ten-year-old RISAT-2 spacecraft. Equipped with X-band radar imagers, RISAT-2B monitors the Earth day and night, in any weather conditions. RISAT uses a technique called Synthetic Aperture Radar (SAR) to build images of the Earth below it. Signals transmitted from the satellite are reflected from the surface and its echo is recorded when it reaches back to the satellite. These signals can then be processed to build a profile of the ground below. The RISAT constellation is operated by the ISRO. While ISRO states the satellites applications as supporting agriculture, forestry and disaster management, their primary purpose is military surveillance.{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2019-028A|title=Display: RISAT-2B 2019-028A|publisher=NASA|date=27 April 2021|access-date=14 May 2021}} {{PD-notice}}
RISAT-2B can operate in different modes including Very High Resolution Radar (VHRR) imaging modes of 1 × 0.5 m resolution and 0.5 × 0.3 m resolution. It is placed in an inclined orbit for better revisit rates over area of interest. Being a radar imaging satellite, RISAT-2B can image during day or night and in all weather conditions.{{cite web|url=https://pib.gov.in/PressReleasePage.aspx?PRID=1577185|title=Earth Observation Satellite RISAT-2B|publisher=Press Information Bureau - Government of India|date=4 July 2019|access-date=15 May 2021}}
Satellite description
RISAT-2B's main sensor is an indigenously developed synthetic-aperture radar (SAR) imaging satellite operating in X-band with 3.6 m radial rib antenna. The satellite is utilized for high resolution spot imaging of locations of interest and it has a mass of {{cvt|615|kg}}.{{cite web|url=https://www.isro.gov.in/update/22-may-2019/risat-2b-radial-rib-antenna|title=RISAT-2B: Radial Rib Antenna|publisher=ISRO|date=22 May 2019|access-date=15 May 2021|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}}
Launch
It was successfully launched aboard a Polar Satellite Launch Vehicle PSLV-C46 launch vehicle at 00:00 UTC on 22 May 2019 from the First Launch Pad at the Satish Dhawan Space Centre.{{cite web|url=https://timesofindia.indiatimes.com/india/pslv-c46/risat-2b-mission-a-success-isro-places-radar-imaging-earth-observation-satellite-in-orbit/articleshow/69436939.cms|title=PSLV-C46 / Risat-2B mission a success, ISRO places radar imaging earth observation satellite in orbit|newspaper=The Times of India|date=22 May 2019|access-date=15 May 2021}}{{cite web|url=https://www.space.com/india-risat-2b-earth-satellite-launch-success.html|title=India Successfully Launches RISAT-2B Earth-Observation Satellite|publisher=SPACE.com|access-date=10 March 2025}}
See also
{{Portal|Spaceflight}}
References
{{Reflist|30em}}
{{PSLV}}
{{RISAT satellites}}
{{Indian spacecraft}}
{{Orbital launches in 2019}}
Category:Spacecraft launched by India in 2019
Category:Earth observation satellites of India
Category:Space synthetic aperture radar
Category:Spacecraft launched by PSLV rockets