VdB 111 in Ophiuchus

© Velimir Popov & Emil Ivanov 2016
Size: 2000 px


VdB 111 is a reflection nebula visible in the constellation Ophiuchus. It is located in the northern part of the constellation, about 6.5 ° WNW direction from the star Cebalrai (β Ophiuchi). The cloud surrounds a sixth magnitude star HD 156697 (or V2112 Ophiuchi), of spectral class F1III / IV. The star in fact is slightly variable - a Delta Scuti type, oscillating just two tenths of a magnitude with a period of about two hours (0.1874 days). With a parallax of 7.17 mas, the distance of the star is reported to be about 140 parsecs (455 light-years), so the same distance to the nebulae Sh2-24 and Sh2-36.


Image details:


Center of field RA 17:18:52 (h:m:s)
Center of field DE +06:06:13 (deg:m:s)
Size 1.9 x 1.29 (deg)
Pixel scale: 2.9 (arcsec/pixel)
Orientation: Up is -75 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: 24. FEb. 2017
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: R:6x10min, G:6x10min, B:6x10min Bin 2, Total 180 min (3:00 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2016. All Rights Reserved
e-mail: info@irida-observatory.org
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