A Dutch satellite for ultraviolet and X-ray astronomy, launched in 1974 August. It carried a 0.22-m telescope for broad-band photometry at ultraviolet wavelengths. Two X-ray devices, consisting of reflecting collectors with proportional counter detectors, covered the energy range 2–40 keV (0.03–0.62 nm). ANS operated until 1976.

http://heasarc.gsfc.nasa.gov/docs/ans/ans.html Information page at Goddard Space Flight Center.