* Astronomy

NGC 2174 (also known as Monkey Head Nebula and CED 67A) is a magnitude +6.8  H II emission nebula associated with the open star cluster NGC 2175 located 6,400 light-years away in the constellation Orion, near the border of Gemini.
The nebula covers an area of sky larger than the full Moon. Narrow-band spectrum images reveal the atomic emission nebula. The green colour is from the emission of hydrogen, red and blue emissions are from sulphur and oxygen. However, in visible light images, NGC 2174 is dominated by the red glow of hydrogen.

The nebula was discovered by French astronomer Edouard Jean-Marie Stephan, using a 80 cm (31.5 inch) reflector at the Marseille Observatory, on the 6th February 1877.

Right Ascension 06h 09m 23.6s, Declination +20° 39' 34"

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