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Technical card

Resolution: 2728x2180

Dates: Feb. 18, 2014Feb. 19, 2014Feb. 20, 2014

Frames:
Baader Ha: 7x1200" -10C bin 1x1
Baader OIII: 14x1200" -10C bin 1x1
Baader SII: 15x1200" bin 1x1

Integration: 12.0 hours

Darks: ~25

Flats: ~20

Bias: ~50

Avg. Moon age: 18.47 days

Avg. Moon phase: 84.75%

Astrometry.net job: 191217

RA center: 112.231 degrees

DEC center: 13.276 degrees

Orientation: -96.008 degrees

Field radius: 0.596 degrees

Locations: San Jose, CA, San Jose, California, United States

Description

The Medusa Nebula (or Abell 21) is a planetary nebula in a distance of 1,500 lightyears in the constellation Gemini. It was discovered fairly recently (1955) and it was first thought to be a supernova remnant. It has its name from the braided serpentine filaments of glowing gas which look like the serpent hair of the Medusa (from the Greek Mythology).

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Author

Mark Striebeck
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Medusa Nebula, Mark Striebeck