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The Miniature X-ray Solar Spectrometer (MinXSS) is a 3 Unit (3U) CubeSatdesigned for a 3-month mission to study solar soft X-ray spectral irradiance.The first of the two flight models was deployed from the International SpaceStation in 2016 May and operated for one year before its natural deorbiting.This was the first flight of the Blue Canyon Technologies XACT 3-axis attitudedetermination and control system -- a commercially available, high-precisionpointing system. We characterized the performance of the pointing system onorbit including performance at low altitudes where drag torque builds up. Wefound that the pointing accuracy was 0.0042\degree\ - 0.0117\degree\ (15$''$ -42$''$, 3$\sigma$, axis dependent) consistently from 190 km - 410 km, slightlybetter than the specification sheet states. Peak-to-peak jitter was estimatedto be 0.0073\degree\ (10 s$^{-1}$) - 0.0183\degree\ (10 s$^{-1}$) (26$''$ (10s$^{-1}$) - 66$''$ (10 s$^{-1}$), 3$\sigma$). The system was capable of dumpingmomentum until an altitude of 185 km. We found small amounts of sensordegradation in the star tracker and coarse sun sensor. Our mission profile didnot require high-agility maneuvers so we are unable to characterize thismetric. Without a GPS receiver, it was necessary to periodically uploadephemeris information to update the orbit propagation model and maintainpointing. At 400 km, these uploads were required once every other week. At$\sim$270 km, they were required every day. We also characterized the powerperformance of our electric power system, which includes a novel pseudo-peakpower tracker -- a resistor that limited the current draw from the battery onthe solar panels. With 19 30\% efficient solar cells and an 8 W system load,the power balance had 65\% of margin on orbit. We present severalrecommendations to other CubeSat programs throughout.

MinXSS-1 CubeSat On-Orbit Pointing and Power Performance: The First  Flight of the Blue Canyon Technologies XACT 3-axis Attitude Determination and  Control System