CTB 1 and VdB 159 - supernova remnant and reflection nebula in Cassiopeia

  Size: 2000 px      
© Velimir Popov & Emil Ivanov 2016

CTB 1 (Abell 85) is a faint, filamentary supernova remnant in the constellation of Cassiopeia. Van den Bergh identified this object as a SNR in 1972 based upon its circular shape. The supernova that created CTB 1 exploded some 8,000 - 10,000 years ago. The distance is estimated to be 10,000 light-years, and the span - about 100 light years. There is an unusual breakout structure referred to as a "shell rupture" toward the northeast, which also can be seen on X-Ray images. The image was composed in this way (CTB at the top of the image) in order this breakout structure to be fully covered. Not far from CTB 1 (but physically not related), is the last object of the van der Berg Catalogue - VdB 159 (see mouseover). It is a small reflection nebula, illuminated by the 7.9 mag. star HD 225180. The blue color of the star (spectral class B9IV) gives the same tinge to the nebula.

Image details:


Center of field RA 00:01:55 (h:m:s)
Center of field DE +62:27:30 (deg:m:s)
Size 1.89 x 1.26 (deg)
Pixel scale: 2.99 (arcsec/pixel)
Orientation: Up is 102 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, Baader Ha and OIII filters
Dates/Times: 29 Jan - 1 Feb. 2017
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: Ha:8x15 min, OIII: 8x15 min, R:6:x10 min, G:6x10 min, B:6x10 min, Bin 2, Total Exposure Time - 420 min. (7:00 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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