The Jena-Optronik ASTRO XP (eXtreme Precision) is an autonomous high accuracy star sensor of the 0.1arcsec class, designed for space applications. It is well suited for science and earth observation missions operating in the low earth orbit (LEO) and geostationary earth orbit (GEO). It is available in various configurations, which also comprises a full redundant arrangement. ASTRO XP is designed to operate under the conditions of a peak solar flare. It consists FaintStar image sensor and has SpaceWire operational interface; along with military standard (MIL-STD) 1553 as an optional interface. Its catoptric optics is made from a low expansion material, in order to achieve the highest level of stability in the space environment.