VdB 152 and Barnard 175 (LDN 1217) in Cepheus

  Size: 1800 px      
© Velimir Popov & Emil Ivanov 2011 - 2017

This image shows a rich field in contellation Cepheus, about 4 ° east of Alfirk (β Cephei). It features the dark nebula Barnard 175 (or LDN 1217) - a region where dust condenses to form protostars, or so called Bok globule. The nebula is dimly illuminated by ultraviolet light, yielding a reddish glow characteristic of Extended Red Emission nebulae (EREs). Inside the nebula there is a white-blue star of the main sequence, BD + 69 1231, of magnitude 9.29, whose radiation gives the surrounding gas a distinctly bluish color. This is the reflection nebula VdB 152. The distance of the structure is estimated at about 400 parsecs (1300 light years).

Image details:


Center of field RA 22:13:14 (h:m:s)
Center of field DE +70:23:44 (deg:m:s)
Size 1.48 x 1.08 (deg)
Pixel scale: 4.83 (arcsec/pixel)
Orientation: Up is 260 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: 26, 27 Jul 2011
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:9x10min., R:8x10 min, G:7x10 min, B:8x10 min, Bin 2, Total Exposure Time - 320 min (5:20h).
More details: Dark and flat frames reduction, bad transparency and seeng
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013 - 2017. All Rights Reserved
e-mail: info@irida-observatory.org
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