The Exosat satellite was operational from May 1983 until April 1986 and in that time made 1780 observations in the X-ray band of most classes of astronomical object including active galactic nuclei, stellar coronae, cataclysmic variables, white dwarfs, X-ray binaries, clusters of galaxies, and supernova remnants. This article is about artificial satellites For natural satellites also known as moons see Natural satellite. Year 1983 ( MCMLXXXIII) was a Common year starting on Saturday (link displays the 1983 Gregorian calendar) Year 1986 ( MCMLXXXVI) was a Common year starting on Wednesday (link displays 1986 Gregorian calendar) X-radiation (composed of X-rays) is a form of Electromagnetic radiation. An active galactic nucleus ( AGN) is a compact region at the centre of a Galaxy which has a much higher than normal luminosity over some or all of the Electromagnetic Cataclysmic variable stars ( CV) are stars which irregularly increase in brightness by a large factor then drop back down to a quiescent state A white dwarf, also called a degenerate dwarf, is a small Star composed mostly of Electron-degenerate matter. X-ray binaries are a class of Binary stars that are luminous in X-rays The X-rays are produced by matter falling from one component (usually a relatively normal Galaxy groups and clusters are the largest Gravitationally bound objects to have arisen thus far in the process of cosmic structure formation A supernova remnant ( SNR) is the structure resulting from the gigantic explosion of a Star in a Supernova. The payload consisted of three instruments that produced spectra, images and light curves in various energy bands.
External links
- ESA's X-ray Observatory (EXOSAT at ESTEC, ESA) on the internet
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