The Medusa Nebula is a planetary nebula in the constellation of Gemini.
It is also known as Abell 21 and Sharpless 2-274.
It was originally discovered in 1955 by University of California, Los Angeles astronomer George O. Abell, who classified it as an old planetary nebula.
It is about 1500 LY away and spans about 8 LY (WIKI)

Ha-RGB image
RGB 20 min each
Ha - 180 minutes

Ha was used as Luminance

Please see the next image for a Hubble color version

Total of about 4 hrs.

Telescope: ASA600 24" RC with Reducer at f4.5
Mount: ASA DDM200 Direct Drive with Absolute Encoders
Camera: Moravian G3 61000 pro

Imaged from Tivoli farm, Namibia