Messier 50 & VdB 87 in Monoceros


12" ASA - LRGB

Messier 50

VdB 87

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© Velimir Popov & Emil Ivanov 2013
This is a rich region of the constellation Monoceros which includes the open cluster M 50 (also catalogued as NGC 2323) and the small reflection/emission nebula VdB 87. It is located in the southern part of the constellation, about 2.5 ° northwest from the Seagull Nebula, a large region of star formation between Monoceros and Canis Major, which also includes the association OB Canis Major OB1. The nebula is divided into three main parts, cataloged as vdB 87a, vdB 87b and vdB 87c, illuminated by three white-blue dwarfs, one of spectral class B6V and the other two of class B1V. The main one, responsible for the illumination of vdB 87c, is BD-08 1665, of magnitude 11.15. The cloud is part of the star-forming region BFS64, a very small apparent H II region associated with a giant molecular cloud whose CO mass is about 23,000 M⊙. In association with this nebulous region there are also the young star object CPM 33, the open clusters [IBP2002] CC04 and [IBP2002] CC05, strongly obscured, and [FT96] 221.9-2.0, a strong source of infrared radiation. The distance of the nebulous complex has been estimated at 2300 parsecs
(over 10,000 light years), therefore well beyond the region of the Seagull Nebula, whose distance is about 990 parsecs. This distance also justifies its reduced apparent dimensions.

Image details:


Center of field RA 07:02:25 (h:m:s)
Center of field DE -08:22:12 (deg:m:s)
Size 1.69 x 1.18 (deg)
Pixel scale: 1.8 (arcsec/pixel)
Orientation: Up is 88 degrees E of N
Charts and image details obtained from
Optic(s): ASA 12" Astrograph @ f/3.6 (Newton)
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters
Dates/Times: 17.11.2012
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: R:8x5 min, G:8x5 min, B:8x5 min Bin 1, Total 120 min (2:00 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013. All Rights Reserved
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