Nighttime Calibration Tests

Today we are doing nighttime calibration tests by opening the door of the NASA hangar and pointing the telescope into the night sky. Unfortunately, Ewe cannot see any X-rays from cosmic objects because Earth’s atmosphere absorbs them. However, we use these tests to cross-calibrate various optical cameras, in particular the star tracker camera, which will guide the pointing of the telescope during the balloon flight, and a CCD camera, which stores¬†information about the optical axis of the X-ray mirror (obtained from optical and X-ray measurements at Goddard).



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