|Operator||NASA / NOAA / DoD|
|Mission duration||5 years|
|Launch mass||2,128 kilograms (4,691 lb)|
|Dry mass||1,400 kilograms (3,100 lb)|
|Payload mass||464 kilograms (1,023 lb)|
|Dimensions||1.3 m x 1.3 m x 4.2 m |
|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|
|Semi-major axis||7,204.0 kilometers (4,476.4 mi)|
|Perigee altitude||833.7 kilometers (518.0 mi)|
|Apogee altitude||834.3 kilometers (518.4 mi)|
|Epoch||25 January 2015, 00:35:06 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. It was launched in 2011 and continues to operate.
Suomi was originally intended as a pathfinder for the NPOESS program, which was to have replaced NOAA's Polar Operational Environmental Satellites and the U.S. Air Force's Defense Meteorological Satellite Program. Suomi was launched in 2011 after the cancellation of NPOESS to serve as a stop-gap 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 EOS 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 fairing). Additionally, the rocket deployed four CubeSats as a part of NASA ELaNa III manifest.
The VIIRS sensor on board the spacecraft acquired its first measurements of Earth 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.
As of August 2018[update] (beyond the initial 5-year mission) the spacecraft continues to operate.
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:
Delta II rocket carrying NPP
NPP launch video
First image acquired by the VIIRS sensor.
This composite image of southern Africa and the surrounding oceans was captured by six orbits of the satellite.
Iowa power outage
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