This is an attractive HII region surrounding a young, luminous open cluster in Monoceros. The open cluster is designated NGC 2244, whilst the nebulosity is designated NGC 2237, although some of the subsections have their own NGC numbers.
This image was taken with a Canon 60Da (Astronomik CLS-CCD filter) mounted on an Ioptron ZE25GT mount. A 300mm f4 IS L lens was used at f5.6. 15 x 90 second subexposures were combined to give a total exposure length of 22.5 minutes. 20 dark frames were used to subtract thermal noise and library bias and flat frames were also subtracted.
Open clusters NGC 2252, Collinder 107 and Collinder 104 are also visible in the wide angle image.