NGC 2174 ( Sh2-252, Monkey Head Nebula) in Orion

© Velimir Popov & Emil Ivanov 2020
Size: 1800 px

NGC 2174 is an H II emission nebula (Sh2-252) located in the constellation Orion. The prominent HII region Sh2-252 was originally catalogued by Sharpless (1959), who related it to an emission nebula (NGC 2174) and a loose stellar distribution (NGC 2175). Currently, NGC 2174 refers to the whole HII region, while NGC 2175 refers to a possible young open cluster (OC) or a stellar group of scattered stars in the nebula. (Bonatto, C.; Bica, E., 2011).Latest investigations reveals existence of the six young clusters associated with that large, diffuse H II region NGC 2174. Their designations are Sh2-252A, Sh2-252C, Sh2-252E, NGC2175s, Teutsch 136 and one possible young open cluster or stellar group NGC2175. The distance from the Sun to this single star-forming complex is 1.4 kpc or 4566 ly (Bonatto & Bica 2011). All these clusters have an estimated age of 5 Myr or less, consistent with the age of the primary ionizing source, the O6.5 V star HD 42088 (Garnier & Lortet-Zuckermann 1971; Felli et al. 1977; Jose et al. 2012). Here can be seen an image taken with 12" RC telescope.


Image details:


Center of field RA 06:09:44 (h:m:s)
Center of field DE +20:33:34 (deg:m:s)
Size 1.48 x 1.07 (deg)
Pixel scale: 2.96 (arcsec/pixel)
Orientation: Up is 184 degrees E of N
Charts and image details obtained from
Optic(s): 12" ASA Astrograph at F/6.8 and F/3.6
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters; Ha Baader filter
Dates/Times: Dec. 2011
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: ;R:6x10 min, G:6x10 min, B:6x10 min;Ha:10x15 min;, OIII:10x15 min; Bin 1 Total exp.time: 480 min. (8 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2020. All Rights Reserved
click tracking