The single image (above left) is the Jovian moon Ganymede as imaged with a 500mm f/15.6 telescope. The telescope’s native focal length of 7800mm did not require additional magnification for the image.

Ganymede is Jupiter’s largest moon; due to its small apparent size, it remains a challenging object to capture. I will return to it in the future!

Ganymede’s angular size is ~1.8 arc seconds. For comparison, the Earth’s moon is 1850 arc seconds in size.