The defunct ROSAT satellite from the German Aerospace Center is losing altitude as it orbits the Earth and is expected to re-enter the atmosphere sometime early Sunday. Before that happens, we’ll have a chance to see it briefly Friday evening. You’ll want to look to the NNW between 7:06:28 and 7:07:38 PM. You’ll notice a dim light moving quickly, reaching a max elevation of 32°. ROSAT was launched on June 1, 1990 and was the largest X-ray observatory of its time. It operated for eight years and supplied data to over 4,000 scientists in 24 countries.