Geosat Trails Flaring Below Mars
Geostationary satellites are here flaring in brightness as they do twice a year around the equinoxes, and are trailing in this image as the camera was tracking the stars, while the satellites, true to their name, remain stationary in the sky. The bright object is Mars, then just past opposition, so the satellites appear close to Mars because they flare when they are near the opposition point, the area of sky opposite the Sun, where they reflect sunlight back to Earth. This was October 17, 2020, with Mars at opposition 4 days earlier.
This is a stack of twelve 1-minute exposures, with the Sigma 50mm lens at f/2.8 and Canon 6D MkII at ISO 1600, on the Star Adventurer 2i tracker. Clouds added gradients.