Spektr-RG

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Spektr-RG (Russian: Спектр-РГ, Spectrum + Röntgen + Gamma; also called Spectrum-X-Gamma, SRG, SXG) is a Russian–German high-energy astrophysics space observatory which was launched on 13 July 2019. The primary instrument of the mission is eROSITA, built by the Max Planck Institute for Extraterrestrial Physics (MPE) in Germany. It will conduct a seven-year X-ray survey,the first in the medium X-ray band less than 10 keV energies, and the first to map all estimated 100,000 galaxy clusters. This survey may detect new clusters of galaxies and active galactic nuclei. The second instrument, ART-XC, is a Russian high-energy X-ray telescope capable of detecting supermassive black holes. The spacecraft will enter an orbit around the Sun, circling the Sun-Earth L2 Lagrangian point in a halo orbit, about 1.5 million kilometres away from Earth. Three years of observations of selected galaxy clusters and AGNs (Active Galactic Nuclei) are planned.