eROSITA

• Deepest all-sky X-ray survey
• 0.2-2keV primarily
• But also 2-10keV
• Science:
• Primary: Cosmology with clusters
• 3 Million AGN expected!

• Survey strategy:
• L2
• Stripes with overlaps
• Entire sky every 6 months, 8 times
• Data:
• Time-domain
• X-ray spectra
• New parameter space!

Built by MPE

Launch: April 2019!