VdB 55 and VdB 58 - reflection nebulae in Orion

  Size: 2000 px      
© Velimir Popov & Emil Ivanov 2016

This image covers a part of the Barnard's Loop in the constellation Orion, about 1° northwest from the star Saiph (κ Orionis). Two reflection nebulae are visible in the foreground: VdB 55 and VdB 58 (see the annotated mouseover). The lighting star responsible for 55 vdB is HD 38023, a blue-white star of the main sequence of spectral class B4V with a magnitude 8.90. Parallax measurements indicate a value of around 3.10 mas, which places the system at about 323 parsecs (1052 light-years). The nebula is crossed by a dark band that divides it into two parts, one to the southwest, where the star is illuminating, and a smaller one to the northeast. HD 38023 is also the dominant star of a young open cluster known as L1641-S, designation that is derived from the number of molecular cloud in which the cluster is located, LDN 1641. The other reflection nebula, VdB 58, is a very weak gas filament lit by a star of apparent magnitude 10.0, cataloged as BD-08 in 1208, which has a reddish color, also impressed on the nebula.

Image details:


Center of field RA 05:43:23 (h:m:s)
Center of field DE -08:21:05 (deg:m:s)
Size 1.8 x 1.18 (deg)
Pixel scale: 2.99 (arcsec/pixel)
Orientation: Up is 105 degrees E of N
Charts and image details obtained from Astrometry.net
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: 2, 3 Nov. 2016
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L: 6x10, R:6x10 min, G:6x10 min, B:6x10 min, Bin 1, Total Exposure Time - 240 min. (4:00 h)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013 - 2016. All Rights Reserved
e-mail: info@irida-observatory.org
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