|Launch mass||320 kilograms (710 lb)|
|Dry mass||63.5 kilograms (140 lb)|
|Start of mission|
|Launch date||December 4, 1998|
|Rocket||Space Shuttle Endeavour (STS-88)|
|Launch site||Kennedy LC-39A|
|End of mission|
|Decay date||November 21, 1999, 17:11UTC|
|Perigee altitude||388.0 kilometers (241.1 mi)|
|Apogee altitude||401.0 kilometers (249.2 mi)|
|Epoch||January 4, 1999|
MightySat-1 was a small spacecraft developed by the U.S. Air Force's Phillips Laboratory (now part of the Air Force Research Laboratory Space Vehicles Directorate) to test technology for small satellites, including advanced dual-junction solar cells, a composite structure, a micrometeorite and debris detector, low-power electronics and a low-shock release device. The 140-pound satellite was launched from the Space Shuttle Endeavour in December 1998, during the 12th day of the STS-88 mission and performed robustly in orbit, with no spacecraft anomalies during its mission. Lt. Barbara Braun of the AFRL was the program manager for the satellite.
MightySat-1's mission ended when it re-entered the atmosphere at 17:11 UTC on November 21, 1999.