Pacman Nebula

71. Pacman Nebula


NGC 281  RA: 0h 52.8'  Dec: +56 37'   Cassiopeia (Cas)

Your calculated location is latitude and longitude

Nebulae SN Remnants Galaxies Clusters Solar System Others     Main Index
Free search:   

 
NGC 281, IC 11 or Sh2-184 is a bright emission nebula and part of an H II region in the northern constellation of Cassiopeia and is part of the Milky Way's Perseus Spiral Arm. This 20×30 arcmin sized nebulosity is also associated with open cluster IC 1590, several Bok globules and the multiple star, 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 it lies 2.82±0.20 kpc. (9200 ly.) from us. Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character.

Edward Emerson Barnard discovered the nebula in August 1883, describing it as "a large faint nebula, very diffuse." Multiple star 'B 1' or β 1 was later discovered by S. W. Burnham, whose bright component is identified as the highly luminous O6 spectral class star, HD 5005 or HIP 4121. It consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 arcsec. There has been no appreciable change in this quintuple system since the first measures were made in 1875.

The nebula region is visible in amateur telescopes from dark sky locations.

In his book Deep Sky Wonders, Walter Scott Houston describes the appearance of the nebula in small telescopes:

"There was a faint glow in the immediate vicinity of the multiple star, with an occasional impression of a much larger nebulosity...Its surface brightness was much less than that of M33 in Triangulum or NGC 205, the distant companion of the Andromeda galaxy."
 

Image Information

Location Burlington IN
Date Nov 21 2009
Optics AT8 Imaging Newtonian
Filters Baader MPCC
Mount Celestron CGE
Camera Canon/Hutech 500DH
ISO 800
Subexposures 10
Exposure Length 300
Guider SV NH2 with ST-4
 

<<Wikipedia>>  <<SIMBAD>>


Go to Ozzzy's Flickr pages
Software   Equipment   Values

All images copyright © 2006-2021, Rick Saunders
Main text descriptions sourced from Wikipaedia.
Sky position information is based on IP geolocation and is therefore approximate.