Oceansat-1
{{Short description|Indian Earth observation satellite}}
{{Use British English|date=May 2020}}
{{Use dmy dates|date=May 2020}}
{{Infobox spaceflight
| name = Oceansat-1
| names_list = OceanSat-1
IRS-P4
Indian Remote Sensing satellite-P4
| image =
| image_caption =
| image_size = 300px
| mission_type = Earth observation
Oceanography
| operator = ISRO
| COSPAR_ID = 1999-029A
| SATCAT = 25756
| website = https://www.isro.gov.in/
| mission_duration = 5 years (planned)
11 years (achieved)
| spacecraft = OceanSat-1
| spacecraft_type =
| spacecraft_bus = IRS-1A
| manufacturer = Indian Space Research Organisation
| launch_mass = {{cvt|1050|kg}}
| dry_mass =
| dimensions = 2.80 m x 1.98 m x 2.57 m
| power = 750 watts
| launch_date = 26 May 1999, 06:22 UTC
| launch_rocket = Polar Satellite Launch Vehicle, PSLV-C2
| launch_site = Satish Dhawan Space Centre, First Launch Pad (FLP)
| launch_contractor = Indian Space Research Organisation
| entered_service = August 1999
| disposal_type =
| deactivated = 8 August 2010
| last_contact =
| orbit_reference = Geocentric orbit
| orbit_regime = Sun-synchronous orbit
| orbit_periapsis = {{cvt|719|km}}
| orbit_apoapsis = {{cvt|730|km}}
| orbit_inclination = 98.4°
| orbit_period = 99.0 minutes
| apsis = gee
| instruments = Multi-frequency Scanning microwave radiometer (MSMR)
Ocean Colour Monitor (OCM) {{cite web|url=https://www.isro.gov.in/update/03-jun-1999/ocean-colour-monitor-of-irs-p4-satellite-tested|title=Ocean Colour Monitor of IRS-P4 Satellite Tested|publisher=ISRO|date=3 June 1999|access-date=13 May 2021}}
| programme = Earth observation satellites series
| previous_mission = IRS-1D
| next_mission = Oceansat-2
}}
Oceansat-1 or IRS-P4 was the first Indian satellite built primarily for ocean applications. It was a part of the Indian Remote Sensing Programme satellite series. The satellite carried an Ocean Colour Monitor (OCM) and a Multi-frequency Scanning Microwave Radiometer (MSMR) for oceanographic studies. Oceansat-1 thus vastly augment the IRS satellite system of Indian Space Research Organisation (ISRO) comprising four satellites, IRS-1B, IRS-1C, IRS-P3 and IRS-1D and extend remote sensing applications to several newer areas.{{cite web |url=https://www.isro.gov.in/Spacecraft/oceansatirs-p4|title=Oceansat (IRS-P4)|publisher=ISRO|date=26 May 1999|access-date=13 May 2021}}
Launch
Oceansat-1 was launched by the Indian Space Research Organisation's PSLV-C2 along with the DLR-Tubsat of Germany and Kitsat-3 of South Korea on 26 May 1999 from the Satish Dhawan Space Centre First Launch Pad of Satish Dhawan Space Centre in Sriharikota, India. It was the third successful launch of Polar Satellite Launch Vehicle (PSLV).{{cite web |url=http://isro.org/satellites/irs-p4_oceansat.aspx|archive-url=https://web.archive.org/web/20130121084057/http://isro.org/satellites/irs-p4_oceansat.aspx|url-status=dead|title=IRS-P4 OceanSat|publisher=ISRO|archive-date=21 January 2013|access-date=13 May 2021}} It was the 8th satellite of the Indian Remote Sensing Programme (IRS) satellite series of India. Oceansat-1 was operated in a Sun-synchronous orbit. On 26 May 1999, it had a perigee of {{cvt|719|km}}, an apogee of {{cvt|730|km}}, an inclination of 98.4°, and an orbital period of 99.0 minutes.{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/displayTrajectory.action?id=1999-029A|title=Trajectory: IRS-P4 1999-029A|publisher=NASA|date=27 April 2021|access-date=13 May 2021}} {{PD-notice}}
Instruments
Oceansat-1 carried two instruments:
- Multi-frequency Scanning Microwave Radiometer (MSMR), collects data by measuring microwave radiation passing through the atmosphere over the ocean.{{cite book |last1=Sastry|first1=Hari Ram Subrahmanya|last2=Ebenezer|first2=D. D.|last3=Sundaram|first3=T. V. S.|title=Proceedings of the International conference on Sonar Sensors of Systems, Vol. 2|year=2002 |publisher=Allied Publishers|isbn=978-81-7764-382-4|page=635}} This offers information including sea surface temperature, wind speed, cloud water content, and water vapour content. MSMR monitor at 6.6 GHz.
- Ocean Colour Monitor (OCM), is a solid state camera literally designed primarily to monitor the colour of the ocean,{{cite book|last1=Mather|first1=Paul|author2=Magaly Koch |title=Computer Processing of Remotely-Sensed Images: An Introduction|date=29 December 2010|publisher=John Wiley and Sons|isbn=978-0-470-66650-0|page=45}} thereby useful for documenting chlorophyll concentration, phytoplankton blooms, atmospheric aerosols and particulate matter.{{cite web |url=https://space.skyrocket.de/doc_sdat/irs-p4.htm|title=IRS-P4 (Oceansat-1)|publisher=Gunter's Space Page|date=7 July 2020|access-date=13 May 2021}} It is capable of detecting eight spectrums ranging from 400 nm to 885 nm, all in the visible or near infrared spectrums.{{cite book|title=Recent Advances In Environmental Science|date=1 January 2003|publisher=Discovery Publishing House|isbn=978-81-7141-679-0|page=350}} OCM monitor globally potential fishery zones, ocean currents, and pollution and sediment inputs in the coastal zones. It operates on eight wavelength bands, providing data with a swath width of 1420 km and at a resolution of 350 metres.{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1999-029A|title=Display: IRS-P4 1999-029A|publisher=NASA|date=27 April 2021|access-date=13 May 2021}} {{PD-notice}}
Mission
References
{{Portal|Spaceflight}}
{{Reflist|30em}}
External links
- [https://web.archive.org/web/20130121084057/http://isro.org/satellites/irs-p4_oceansat.aspx Indian Space Research Organisation: IRS-P4]
{{IRS satellites}}
{{Indian spacecraft}}
{{Orbital launches in 1999}}
Category:Earth observation satellites of India