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NGC 2237 - Rosette Nebula
Monoceros    
Penryn, California
December 2007
FCL-90 @ f4.5 (ag, ST-4)
ST-10SME  L(ha)R(ha)GB 10 minute subs lrgb, 15 minute subs ha

Burnham describes NGC2237 as most massive nebula known.  The nebula is thought to be approximately 2,600 light years distant and 55 light years in diameter.  The star cluster NGC2244 is in front of the nebula is believed to be the illuminating source