SH2-274 (Joe Matthews)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: HD59152 · HD59309 · HD59432 · HD59450 · HD59764 · NGC 2395 · PK205+14.1 · Sh2-274

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SH2-274

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SH2-274

The Moon was full and bright and I got a late start and have an early Monday morning appointment so I had limited time to spend. So this image is comprised of 15 / 600 second subs. I plan to spend more time on SH2-274 in the future

Although Abell 21, or Sh2-274 has a large apparent diameter of 10 arcminutes, its surface brightness is so low, with features ranging from magnitude 16-25, that it was not discovered until 1955. It is a planetary nebula lying at a distance of 1,500 light-years in the constellation Gemini, which gives it an estimated diameter of 4 light-years. The parent star, now a white dwarf, is thought to be the deep blue star near the center of the crescent. The braided filaments of the shell the star shed during its red giant phase resemble the serpents that comprise the hair of Medusa, giving the nebula its popular name, the Medusa Nebula. Beyond the beautiful braided crescent, additional hydrogen-alpha nebulosity, shed earlier by the star, can be seen at the center right and upper right corner of the image.
Information from @Sky and Telescope

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Status	Advanced success
Started	...
Astrometry.net job	7301721
PixInsight job	SH9JMJFY5TI4QAXQQPGH38D7GJRT3LD1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h29m06s.713
RA (top/left)	07h32m18s.510
RA (top/right)	07h26m07s.454
RA (bottom/right)	07h25m56s.114
RA (bottom/left)	07h32m04s.563

Dec (center)	+13°15′05″.87
Dec (top/left)	+13°57′47″.29
Dec (top/right)	+14°00′55″.74
Dec (bottom/right)	+12°32′15″.45
Dec (bottom/left)	+12°29′08″.89

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