NGC 281 (Sh2-184, Packman Nebula) in Cassiopeia




© Velimir Popov & Emil Ivanov 2020
Size: 1800 px
NGC 281 (also catalogued IC 11, Ced 3, LBN 616, Sh 2-184, or Pacman Nebula) is an H II region in the constellation of Cassiopeia. This 20×30 arcmin sized nebulosity is also associated with the open cluster IC 1590, several Bok globules and the multiple star HD 5005 of spectral class B 1. It collectively forms Sh2-184, spanning over a larger area of 40 arcmin. A recent distance from radio parallaxes of water masers at 22 GHz made during 2014 is estimated to be 2.82±0.20 kpc. (9200 ly.) from the Solar System. Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the popular video game character.

Image details:


Center of field RA 00:52:46 (h:m:s)
Center of field DE +56:40:31 (deg:m:s)
Size 73.2 x 51.7 (arcmin)
Pixel scale: 2.44 (arcsec/pixel)
Orientation: Up is 270 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: Luminance, Red, Green, Blue, Astronomik filters
Dates/Times: 4.Aug.2011
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:6x10min;R:6x10 min, G:6x10 min, B:6x10 min; Bin 1 Total exp.time: 240min (4:00 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2020. All Rights Reserved
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