Soil Moisture Active Passive
Soil Moisture Active Passive (SMAP) is a NASA environmental monitoring satellite that measures soil moisture across the planet. It is designed to collect a global 'snapshot' of soil moisture every 2 to 3 days. With this frequency, changes from specific storms can be measured while also assessing impacts across seasons of the year. SMAP was launched on 31 January 2015. It was one of the first Earth observation satellites developed by NASA in response to the National Research Council's Decadal Survey.
An artist rendering of the Soil Moisture Active Passive spacecraft. | |
| Mission type | Earth observation |
|---|---|
| Operator | NASA |
| COSPAR ID | 2015-003A |
| SATCAT no. | 40376 |
| Website | smap |
| Mission duration | 3 years (nominal) Elapsed: 9 years, 9 days |
| Spacecraft properties | |
| Manufacturer | Jet Propulsion Laboratory |
| Launch mass | 944 kg |
| Payload mass | 79 kg |
| Dimensions | 1.5 x 0.9 x 0.9 m |
| Power | 1450 watts |
| Start of mission | |
| Launch date | 31 January 2015, 14:22 UTC |
| Rocket | Delta II 7320-10C |
| Launch site | Vandenberg, SLC-2W |
| Contractor | United Launch Alliance |
| Entered service | August 2015 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Sun-synchronous |
| Perigee altitude | 680.9 km |
| Apogee altitude | 683.5 km |
| Inclination | 98.12° |
| Period | 98.5 minutes |
| Epoch | 15 October 2019, 23:39:39 UTC |
NASA invested US$916 million in the design, development, launch, and operations of the program.
An early fault in a radar power supply limited the resolution of the radar data collected from 2015 onwards.
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