| MightySat-2.1 | |
| Mission Type: | Technology |
| Operator: | AFRL |
| Cospar Id: | 2000-042A |
| Mission Duration: | 2 years, 4 months |
| Manufacturer: | Spectrum Astro |
| Launch Mass: | 130kg (290lb) |
| Power: | 330 watts |
| Instruments: | Fourier Transform Hyperspectral Imager |
| Launch Site: | Vandenberg SLC-8 |
| Launch Contractor: | Orbital Sciences |
| Orbit Epoch: | 19 September 2000, 16:09:00 UTC[1] |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Low Earth |
| Orbit Periapsis: | 548km (341miles) |
| Orbit Apoapsis: | 585km (364miles) |
| Orbit Inclination: | 97.8 degrees |
| Orbit Eccentricity: | 0.00266 |
| Orbit Period: | 96.0 minutes |
| Apsis: | gee |
MightySat-2.1,[2] also known as P99-1 or Sindri was a small spacecraft developed by the Air Force Research Laboratory[3] to test advanced technologies in imaging, communications, and spacecraft bus components in space.
MightySat II.1 was manufactured by Spectrum Astro[2] in a modular approach, using, e.g., VME-based subsystems, and a planar payload deck for small experimental payloads. The satellite measured 0.67m x 0.83m x 0.86m (WxLxH) and had a launch weight of 123.7 kg (Bus Mass: 87.1 kg). Power was provided by 2-axis articulated Si solar arrays with a designed end-of-life power output of 330 W. The attitude determination and control subsystem featured a 3-axis zero-momentum-bias reaction wheel assembly with a Sun sensor, a star tracker and inertial measurement units, delivering an attitude jitter of 15.7 arcsec/sec, and pointing accuracy and knowledge of 648 and 540 arcsec, respectively. The communication was compatible with the US Air Force space-ground link system with data rates of 1 Mbit/s for payload/experiments data downlink, 2.0 kbit/s for command uplink, and 20 kbit/s for telemetry downlink. Computing and data handling was done by a RAD6000 CPU @ 20 MIPS with an IEEE VME backplane 128 MByte CPU RAM, and a 21.6 MBytes/sec transfer rate, and a 2 Gbit solid state recorder for science data. Among its 10 experiments was a Fourier transform hyperspectral imager.[4]
MightSat II.1 was launched on July 19, 2000, with a Minotaur I. It deorbited in November 2002 due to natural decay of its orbit, exceeding more than twice its nominal lifetime.[4]