NGC 2174, NGC 2175, Orion, Monkey Head Nebula, in Ha
NGC 2174 is a large ionized hydrogen (Hii) region in Orion which absorbs ultraviolet light from internal stars, and re-emits the energy in the wavelengths of the Balmer series. The nebula is approximately 45 arcmin in angular size, and 6.8 in integrated apparent magnitude. It lies at the distance of 6,400 LY from Earth, and is calculated to be approximately 84 LY in diameter. It contains a number of internal features indicated on the annotated image, including stellar nursery SH 2-252B and open star cluster NGC 2175. A small emission nebula, LBN 189.02+00.91, composed of ionized hydrogen and interstellar matter (ISM), is located about 1 degree to the north.
The attached image was taken on 1 Dec 2019 with a remote controlled Takahashi FSQ-ED 106 x 530 mm on a Paramount GEM mount. The image is a 30% crop of a stack of 9 x 600 sec exposures in Ha light processed with DSS, XnView, and StarTools.
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