The Rosette Nebula NGC 2237 in Monoceros, a large circular HII...

The Rosette Nebula NGC 2237 in Monoceros, a large circular HII region. The open star cluster NGC 2244 has formed out of—and continue to form out of—the Rosette’s abundance of hydrogen and other materials. NGC 2237 is about 5000 lightyears away from us, and it’s about 130 lightyears across. That’s Sh2-280 on the right, a dim diffuse nebula. Another one from my backyard with the William Optics SpaceCat 51 250mm FL APO refractor, iOptron CEM25P EQ mount, ZWO Astronomy Cameras ASI071MC cooled color camera, Celestron UHC/LPR filter. 13 x 2-minute exposures, 4 x 8 minute exposures.