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Downtime
STScI will be performing network upgrades on the following dates:
  • Sat 17 Apr 2021, 7:00 AM - 2:00 PM EDT (11:00 - 18:00 UTC)
  • Sat 24 Apr 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
  • Sat 1 May 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
  • Sun 2 May 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
  • Sat 8 May 2021, TBD
  • Sun 9 May 2021, TBD
Services may be unavailable or interrupted during these times.

X-ray Multi-Mirror (XMM) Telescope

The X-ray Multi-Mirror (XMM) Telescope was launched by ESA on December 10th, 1999 and carries two distinct types of telescope: three Wolter type-1 X-ray telescopes, with different X-ray detectors in their foci, and a 30-cm optical/UV telescope with a microchannel-plate pre-amplified CCD detector in its focal plane. The Optical Monitor can provide spectral resolution by the use of broad- and narrow-band filters contained within a filter wheel, plus there are also two grisms in the filter wheel for low resolution spectroscopy. The spatial pixel size in normal operation is 1 arc second and the limiting sensitivity is B=24 for a star viewed with the detector in unfiltered light.

Real time tracking for XMM


Map of XMM-OM observations


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