NGC 457 - open cluster in Cassiopeia


12" ASA - LRGB

12" ASA - LRGB - Crop

    Size: 2000 px Size: 2000 px    
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© Velimir Popov & Emil Ivanov 2016

NGC 457 (or Caldwell 13) is an open star cluster in the constellation Cassiopeia. It was discovered by William Herschel in 1787, and lies over 7,900 light years away from the Sun. Its age is estimated to be 21 million years. The cluster is sometimes referred as the Owl Cluster. The cluster features a rich field of about 150 stars of magnitudes 12-15.

Image details:


Center of field RA 01:20:10 (h:m:s)
Center of field DE +58:13:51 (deg:m:s)
Size 1.56 x 1.08 (deg)
Pixel scale: 1.8 (arcsec/pixel)
Orientation: Up is -72.6 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: Ha, Red, Green, Blue, Astronomik filters
Dates/Times: 9 August 2015
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:3x5min.,R:3x5 min, G:3x5 min, B:3x5 min Bin 1, Total 60 min (1:00 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2016. All Rights Reserved
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