XMM
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About This Satellite
XMM-Newton, launched by ESA in December 1999, is an X-ray observatory with three large mirror modules and unmatched collecting area. From a highly elliptical orbit it studies black holes, neutron stars, and hot gas in galaxy clusters.
Source: Wikipedia — XMM-Newton (CC BY-SA 4.0)
XMM is a cataloged satellite tracked under NORAD ID 25989 with international designator 99066A. According to the GCAT master catalog, it was built by DASCF, on the XMM platform, with a launch mass of about 3764 kg, with a shape described as Cyl + 2 Pan. According to the TLE snapshot used when this page was generated (2026-08-18), its HEO orbit had an apogee of about 91.738 km and a perigee near 29.400 km, with an inclination of 64.15° and a period of roughly 2872.7 minutes; at apogee its speed was about 1.47 km/s. Positions on this page are near-real-time SGP4 predictions propagated from the latest two-line element (TLE) data.
In the TLE snapshot used to generate this page, XMM's apogee was 91.738 km, where its speed was about 1.47 km/s, completing about 0.5 orbits of Earth per day. Track it live on the map above or in the JOT orbital map.