WorldView-4
| WorldView-4 | |
|---|---|
| Type: | Earth observation satellite |
| Country: |
 United States
|
| Operator: | DigitalGlobe |
| COSPAR-ID : | 2016-067A |
| Mission dates | |
| Dimensions: | 2087 kg |
| Size: | 5.3 × 2.5 m (7.9 m span with solar cells) |
| Begin: | November 11, 2016 at 18:30:33 UTC |
| Starting place: | Vandenberg |
| Launcher: | Atlas V 401 AV-062 |
| Status: | inactive |
| Orbit data | |
| Rotation time : | 97 min |
| Track height: | 617 km |
| Orbit inclination : | 98 ° |
WorldView-4 was a commercial earth observation satellite from the American company DigitalGlobe .
It was launched into sun-synchronous orbit on November 11, 2016 at 18:30:33 UTC with an Atlas V-401 launcher from the Vandenberg rocket launch site.
WorldView-4 was originally developed by GeoEye as GeoEye-2. The contract to build GeoEye-2 was awarded to Lockheed Martin in March 2010 . The launch of the satellite was scheduled for spring 2013, but was canceled and the satellite was put into storage after GeoEye merged with competitor DigitalGlobe .
The hexagonal and three-axis stabilized satellite is equipped with a camera with a resolution of 0.31 m panchromatic (450-800 nm) and 1.24 m 4-band multispectral (blue: 450-510 nm, green: 510-580 nm, red: 655–690 nm, infrared: 780–920 nm) has and is intended to provide commercial images of the earth's surface for a wide variety of purposes. The GIS-2 camera was built by ITT Corporation and has an aperture of 1.1 m and a swath width in the nadir of 13.1 km. The satellite can record images up to 65 ° away from the nadir, with the resolution falling to 3.5 m panchromatic and 14 m multispectral. It can be swiveled very quickly, so that the recording area can be shifted by 200 km in about 10 s. This enables the satellite to record images with a size of 66.5 km × 112 km (five strips) and stereo images with a size of 26.6 km × 112 km, for a total of 680,000 km² per day. It was built on the basis of the LM-900 satellite bus from Lockheed Martin Space Systems and has a planned service life of 10 to 12 years. The energy supply is provided by six gallium arsenide solar cell panels with a size of 1.17 × 2.01 m as well as lithium-ion batteries. The data transmission to earth takes place in the X-band with 800 Mbit / s.
Since January 7, 2019, WorldView-4 has been unable to provide usable images due to the loss of a stability axis due to the failure of a tethered gyro (control moment gyro, CMG) supplied by Honeywell . The operator Maxar is trying together with its suppliers to restore the satellite functionality, but so far without success. At this point in time, Maxar assumes that the full functionality of WorldView-4 is unlikely to be recoverable. Therefore, the satellite has been brought into a safe operating condition, but its position and condition are still monitored. The satellite is insured for $ 183 million.
Web links
Individual evidence
- ↑ a b Spaceflight 101: WorldView-4 , accessed November 18, 2016
- ↑ eoPortal: WorldView-4 - Satellite Missions - eoPortal Directory , accessed on November 18, 2016
- ↑ a b satimagingcorp.com: WorldView-4 Satellite Imagery and Satellite Sensor Specifications | Satellite Imaging Corp , accessed November 18, 2016
- ↑ SpaceNews.com: Lockheed Martin Selected To Build GeoEye-2 Imaging Satellite , accessed November 18, 2016
- ^ Justin Ray: Atlas 5 rocket picked to launch commercial imager. Spaceflight Now, September 7, 2010, accessed September 9, 2010 .
- ^ Justin Ray: One commercial Earth-imager deferred in favor of another. Spaceflight Now, February 4, 2013, accessed February 5, 2013 .
- ↑ MaxAR Technologies: MaxAR Technologies Ltd. - Maxar Technologies Reports Failure of its WorldView-4 Imaging Satellite , accessed January 7, 2019