|Mission duration||5 years|
|Dry mass||2200 kg|
|Start of mission|
|Launch date||28 October 2011, 09:48:01.828UTC|
|Rocket||Delta II 7920-10 D357|
|Launch site||Vandenberg SLC-2W|
|Contractor||United Launch Alliance|
|Perigee||833 kilometers (518 mi)|
|Apogee||834 kilometers (518 mi)|
|Epoch||7 March 2014, 03:27:56 UTC|
The Suomi National Polar-orbiting Partnership or Suomi NPP, previously known as the National Polar-orbiting Operational Environmental Satellite System Preparatory Project (NPP) and NPP-Bridge, is a weather satellite operated by the United States National Oceanic and Atmospheric Administration. Originally intended as a pathfinder for the NPOESS programme, which was to have replaced NOAA's Polar Operational Environmental Satellites and the US Air Force's Defense Meteorological Satellite Program, Suomi was launched in 2011 after the cancellation of NPOESS to serve as a gapfiller between the POES satellites and the Joint Polar Satellite System which will replace them. Its instruments provide climate measurements that continue prior observations by NASA's Earth Observing System.
The satellite was launched from Space Launch Complex 2W at Vandenberg Air Force Base in California by a United Launch Alliance Delta II 7920-10C on October 28, 2011. The satellite was placed into a sun-synchronous orbit 824 km (512 miles) above the Earth.
NPOESS Preparatory Project (NPP) is intended to bridge the gap between old and new systems by flying new instruments, on a new satellite bus, using a new ground data network. Originally planned for launch five years earlier as a joint NASA/NOAA/DOD project, NPP was to be a pathfinder mission for the larger National Polar-orbiting Operational Environmental Satellite System until DOD participation in the larger project was dissolved. The project continued as a civilian weather forecasting replacement for the NOAA Polar Operational Environmental Satellites (POES) series, and ensured continuity of climate measurements begun by NASA's Earth Observing System.
The spacecraft was launched 28 October 2011 from Vandenberg Air Force Base via a Delta II in the 7920-10 configuration (Extra Extended Long Tank with RS-27A engine first stage, 9 GEM-40 solid rocket motors, type 2 second stage with Aerojet AJ10 engine, no 3rd stage and a 10 meter faring).
The VIIRS sensor on board the spacecraft acquired its first measurements on November 21, 2011.
NASA also released a high resolution blue marble image of the Earth showing most of North America, which was created by NASA oceanographer Norman Kuring using data obtained on January 4, 2012 by the Visible Infrared Imager Radiometer Suite, one of five imaging systems aboard the satellite. That date was chosen because it was a fairly sunny day in most of North America.
Instrumentation and capabilities
The Suomi NPP is the first in a new generation of satellites intended to replace the Earth Observing System satellites, which were launched from 1997 to 2011. The satellite orbits the Earth about 14 times each day. Its five imaging systems include:
- Advanced Technology Microwave Sounder (ATMS), a microwave radiometer which will help create global moisture and temperature models
- Cross-track Infrared Sounder (CrIS), a Michelson interferometer to monitor moisture and pressure
- Ozone Mapping and Profiler Suite (OMPS), a group of imaging spectrometers to measure ozone levels, especially near the poles
- Visible Infrared Imaging Radiometer Suite (VIIRS), a 22-band radiometer to collect infrared and visible light data to observe wildfires, movement of ice, and changes in landforms
- Clouds and the Earth's Radiant Energy System (CERES), a radiometer to detect thermal radiation, including reflected solar radiation and thermal rediation emitted by the Earth
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- VIIRS First Light
- Muth, C.; P.S. Lee; J. C. Shiue, W. Allan Webb (27 December 2004). "Advanced Technology Microwave Sounder on NPOESS and NPP". Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004 IEEE International 4: 2454–2458. doi:10.1109/IGARSS.2004.1369789.
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