This version of Sh2-274 is a bicolor HOO image with 2 hours of Ha and 2 hours of O3 taken from my driveway Jan. 2022.
Subs were 3 minutes each with an ASI 1600 mm Pro, MyT mount, and SXV 130 scope.
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.
[4] 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.
[4] As the nebula is so large, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported. (from Wikipedia).
Enjoy
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