Daqi-1
| Mission type | Remote sensing |
|---|---|
| Operator | China National Space Administration |
| COSPAR ID | 2022-039A |
| SATCAT no. | 52257 |
| Mission duration | 8 years (planned) |
| Spacecraft properties | |
| Bus | SAST-5000B |
| Manufacturer | Shanghai Academy of Spaceflight Technology |
| Start of mission | |
| Launch date | 15 April 2022, 18:16 UTC |
| Rocket | Long March 4C |
| Launch site | Taiyuan Satellite Launch Center, Launch Complex 9, Shanxi, China |
| Contractor | China Aerospace Science and Technology Corporation |
| Instruments | |
| ACDL, DPC-II, EMI-II, POSP, WSI | |
Daqi-1 or Atmospheric Environment Monitoring Satellite is a Chinese atmospheric environmental monitoring satellite in sun-synchronous orbit which was launched on 15 April 2022.[1]
Its Aerosol and Carbon Detection Lidar (ACDL) instrument is thought to be the most likely cause of a green laser light observed over Hawaii on 28 January 2023 by the Subaru Telescope.[2] Some believe the satellite was using the ACDL sensor to conduct laser topographic intelligence collection being done for military purposes.[3]
Spacecraft architecture
[edit | edit source]The spacecraft is based on the Shanghai Academy of Spaceflight Technology's SAST-5000B bus and is similar to the Gaofen 5 satellite.[4][5][6]
The satellite was launched from the Taiyuan Satellite Launch Center's Launch Site 9, via a Long March 4C rocket.[4][5][6]
Sensors onboard
[edit | edit source]- ACDL (Aerosol and Carbon dioxide Detection Lidar)[4]
- DPC-II (Directional Polarimetric Camera)[4]
- EMI-II (Environmental Trace Gas Monitoring Instrument)[4]
- POSP (Particulate Observing Scanning Polarization)[4]
- WSI (Wide Spectral Imager)[4]
- The wide-swath imager (WSI) equipped on the DaQi-1 satellite uses a 45° rotary scanning mirror, a K-mirror, and several linear-array charge-coupled devices (CCDs) to collect ground images in a whiskbroom mode. [7]
References
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