Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  NGC 281
Pacman Nebula NGC281, 



    
        

            spectre68
Pacman Nebula NGC281
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Pacman Nebula NGC281

Pacman Nebula NGC281, 



    
        

            spectre68
Pacman Nebula NGC281
Powered byPixInsight

Pacman Nebula NGC281

Technical card

Imaging telescopes or lenses: TS APO TS ED 70  ·  Celestron C8 CPC 800 XLT

Imaging cameras: Canon 550D

Mounts: Celstron CPC800 alt/az

Guiding cameras: ATIK Titan mono

Software: Pisinsight 1.8

Accessory: TS Optics Barlow 2,5x APO  ·  Celestron equatorial wedge


Dates:Dec. 23, 2016Dec. 31, 2016Jan. 3, 2017

Frames:
80x240" (5h 20') ISO1600 -5C bin 1x1
15x360" (1h 30') ISO1600 -7C bin 1x1

Integration: 6h 50'

Darks: 11

Flats: 22

Bias: 22

Avg. Moon age: 10.46 days

Avg. Moon phase: 19.40%

Bortle Dark-Sky Scale: 5.00


Basic astrometry details

Astrometry.net job: 1409480

RA center: 00h52m56s.4

DEC center: +56°3242

Pixel scale: 0.858 arcsec/pixel

Orientation: 178.157 degrees

Field radius: 0.515 degrees


Resolution: 1824x1430

Locations: Spectre Observatory, Castello Tesino, Trento, Italy

Description

NGC 281 is an H II region in the constellation of Cassiopeia and part of the Perseus Spiral Arm. It includes the open cluster IC 1590, the multiple star HD 5005, and several Bok globules. Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character.

The nebula was discovered in August 1883 by E. E. Barnard, who described it as "a large faint nebula, very diffuse." The multiple star HD 5005, also called {\displaystyle \beta 1} {\displaystyle \beta 1}, was discovered by S. W. Burnham. It consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 seconds of arc. There has been no appreciable change in this quintuple system since the first measurements were made in 1875.

The nebula 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:[3]

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.

Wikipedia

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Pacman Nebula NGC281, 



    
        

            spectre68