SUNSET: 
0
Photographer:
massimo.difusco
Location of Photo:
Ferrara (Italy)
Date/Time of photo:
01/02/2025 23:00
Equipment:
Konus 200/1000 @950mm, Player One Poseidon-C camera, Sky-Watcher Eq6r Pro Mount, Optolong L-Ultimate and L-QEF filters
Description:
The Medusa Nebula (also known as Abell 21 or Sh2-274) is a planetary nebula located in the constellation of Gemini. It was originally discovered in 1955 by astronomer George O. Abell, who classified it as an old planetary nebula. Until the early 1970s, the nebula was thought to be a supernova remnant. With the computation of expansion velocities and the thermal character of the radio emission, Soviet astronomers in 1971 concluded that it was most likely a planetary nebula. As the nebula is so large, its surface brightness is very low, with surface magnitudes of between +15.99 and +25.00 reported.
