HEAO-2

HEAO-2 (for High Energy Astrophysics Observatory 2, aka High Energy Astronomy Observatory 2, Einstein Observatory or HEAO-B) was a NASA X-ray observatory in space from 1978 to 1982. It was part of a program that included HEAO-1 and HEAO-3. HEAO-2 instruments:

• HRI - High Resolution Imaging camera.
• IPC - Imaging Proportional Counter.
• SSS - Solid State Spectrometer.
• FPCS - Bragg Focal Plane Crystal Spectrometer.
• MPC - Monitor Proportional Counter.
• BBFS - Broad Band Filter Spectrometer.
• OGS - Objective Grating Spectrometer.

Note that a Chinese X-ray space observatory launched in 2024 is named the Einstein Probe.