M1 (Gary Imm) - AstroBin

M1

This showcase object is a mag 8.4 supernova remnant located 6500 light years away in the constellation of Taurus. Ii is about 7 arc-minutes in diameter, which corresponds to an actual diameter of 13 light years.

M1 is one of the few deep sky objects whose birth was witnessed by man. Chinese astronomers watching the sky on July 4, 1054, noted the appearance of a new star in the night sky. The bright source was visible during the daytime for 23 days, shining six times as brightly as Venus. Astronomers were able to see it in the night sky with the naked eye for almost two years. Other observations were recorded by Japanese, Arabic, and Native American stargazers. This "new star" was actually the death of an old star in a violent supernova explosion. The nebula itself was discovered in 1721 by the British astronomer John Bevis.

This object is designated M1, as the first object in Charles Messier's 250 year old catalog of deep sky objects which are not comets. The Crab Nebula nickname was due to its resemblance to a crab's claw (not the full-body image of a crab) in an early sketch made in 1855. But in this photographic image, it doesn't really resemble a crab claw.

The fine tendrils seen throughout the nebula are ionized hydrogen, oxygen and sulfur gas fronts, ejected in the supernova explosion. The different colors are reflective of the variation in the strengths of these gas shock waves. The nebula continues to rapidly expand outward, changing the details of its appearance slightly each year. The current diameter of the nebula is just over 10 light years.

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Status	Advanced success
Started	...
Astrometry.net job	5518777
PixInsight job	8ZR1V2OQGEUHKPYFL5YHNOWZY8H5GG87
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h34m32s.537
RA (top/left)	05h35m19s.300
RA (top/right)	05h33m44s.618
RA (bottom/right)	05h33m46s.740
RA (bottom/left)	05h35m20s.389

Dec (center)	+22°00′49″.14
Dec (top/left)	+22°08′38″.15
Dec (top/right)	+22°08′14″.85
Dec (bottom/right)	+21°53′00″.19
Dec (bottom/left)	+21°53′23″.87

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