Payload (satellite)
XMM-NEWTON
XMM-NEWTON is a satellite launched 1999-12-10 by European Space Agency.
About

XMM-Newton, also known as the High Throughput X-ray Spectroscopy Mission and the X-ray Multi-Mirror Mission, is an X-ray space observatory launched by the European Space Agency in December 1999 on an Ariane 5 rocket. It is the second cornerstone mission of ESA's Horizon 2000 programme. Named after physicist and astronomer Sir Isaac Newton, the spacecraft is tasked with investigating interstellar X-ray sources, performing narrow- and broad-range spectroscopy, and performing the first simultaneous imaging of objects in both X-ray and optical wavelengths.
Right now
Dotted: where it has been. Solid: the next orbit and a half. Orbit data from CelesTrak, map from NASA Blue Marble. All credits