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Contains:  NGC 281
Getting plate-solving status, please wait...
NGC281 - Hubble Palette, 


            Thomas Richter
NGC281 - Hubble Palette

NGC281 - Hubble Palette

Technical card

Resolution: 5496x3672

Dates:Aug. 13, 2016Aug. 20, 2017Aug. 28, 2017Sept. 20, 2019

Baader Ha 1.25" 7nm: 17x600" (gain: 200.00) -20C bin 1x1
Baader Ha 2" 7nm: 27x600" -20C bin 1x1
Baader Planetarium O3 1.25" 8.5nm: 8x900" -20C bin 1x1
Baader Planetarium SII 1.25" 8nm: 19x900" -20C bin 1x1

Integration: 14.1 hours

Darks: ~27

Flats: ~27

Flat darks: ~100

Avg. Moon age: 16.30 days

Avg. Moon phase: 46.50% job: 2943205

RA center: 0h 52' 54"

DEC center: +56° 37' 40"

Pixel scale: 0.493 arcsec/pixel

Orientation: 67.358 degrees

Field radius: 0.453

Locations: Nürnberg, Nürnberg, Bayern, Germany

Data source: Backyard


The new Ha-data were captured on a Raspberry PI4 (4GB RAM) with Ubuntu Server 18.04 by CCDCiel over INDIlib.

Object description (

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.

E. E. Barnard discovered this nebula in August 1883, who described 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.



Thomas Richter
License: None (All rights reserved)


  • Final
    NGC281 - Hubble Palette, 


            Thomas Richter
  • NGC281 - Hubble Palette, 


            Thomas Richter


new H-alpha data captured on Raspberry PI4

Sky plot

Sky plot


NGC281 - Hubble Palette, 


            Thomas Richter