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The impact of large-scale constellations of satellites, is a concern forground-based astronomers. In recent years there has been a significant increasein the number of satellites in Low-Earth Orbit and this trend is set tocontinue. The large number of satellites increases the probability that onewill enter the field of view of a ground-based telescope at the right solarangle to appear bright enough that it can corrupt delicate measurements. Wepresent a new tool Astrosat that will project satellite orbits onto the RA/DECcoordinate system for a given observer location and time and field of view.This enables observers to mitigate the effects of satellite trails throughtheir images by either avoiding the intersection, post-processing using theinformation as a prior or shuttering the observation for the duration of thetransit. We also provide some analysis on the apparent brightness of thelargest of the constellations, Starlink, as seen by a typical observatory andas seen with the naked eye. We show that a naked eye observer can typicallyexpect to see a maximum of 5 Starlink satellites at astronomical twilight, whenthe sky is dark. With the intended 40000 satellites in the constellation, thatnumber would increase to 30.

Astrosat: Forecasting satellite transits for optical astronomical observations