Exposures: 240 min of Ha (15 min subs) ; 60 min each RGB (in 5 minute sub exposures) for a total of 7 hrs
The cone's shape comes from a dark absorption nebula consisting of cold molecular hydrogen and dust in front of a faint hydrogen nebula containing hydrogen ionized by the bright star S Monocerotis. The dark nebula is approximately seven light-years long.
FOV = 23 x 15 arc minutes
2, 700 light years away
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