Celestial hemisphere:  Northern  ·  Constellation: Gemini (Gem)
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The Medusa Nebula - Sharpless 2-274, Cy Borg
The Medusa Nebula - Sharpless 2-274
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The Medusa Nebula - Sharpless 2-274

Getting plate-solving status, please wait...
The Medusa Nebula - Sharpless 2-274, Cy Borg
The Medusa Nebula - Sharpless 2-274
Powered byPixInsight

The Medusa Nebula - Sharpless 2-274

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Description

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. As the nebula is so large, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported.

The central star of the planetary nebula is an PG 1159 star

TAK106
2600MM -20
Ha 19 x 10 min subs 3nm
Oiii 22 x 10 min subs 3nm
Bad seeing
Ha 12nm picked up nothing.
50 dark
50 bias
50 flats

APP P.I. PS

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The Medusa Nebula - Sharpless 2-274, Cy Borg