Click here for a full resolution image (908 KB)

 

 

 

The Details
Object
NGC 281 in Cassiopeia
Optics
Astro-Physics 160 EDF Refractor at f/7.7
Platform
Astro-Physics 1200 GTO
Camera
SBIG ST-10XME
Filters
Tru-Balance 5nm H-alpha, 3nm OIII, 3nm SII filters Gen 2
Date
01, 03 November 2010 and 08, 09, 12 October 2011
Location
Mount Wilson Observatory - Mount Wilson, CA
Exposure
Ha 8h40m; OIII 4h20m; SII 8h20m - Total exposure time 21h20m
Software
Maxim DL/CCD, CCDStack 2, Photoshop CS5
Orientation
Field of View: 34’13" x 24’50" centered on RA 00h53m04.0s
DEC+56°36’13” (2000.0). North angle 272.5°; east 90° CCW from north
Notes

NGC 281, the Pac-Man Nebula in Cassiopeia, is an often imaged target of amateur astronomers. Lying at a distance of about 9500 light years from Earth, this spectacular emission nebula is noted for its deep, dark gash of obscuring dust and numerous Bok globules. At the center lies the small open cluster IC 1590, its massive young stars providing the illumination for the nebula. The brightest of these stars is a multiple system named BU 1 for its discoverer, the famed double star astronomer S.W. Burnham.

This "false color" image was created using a tricolor technique by assigning SII to the red channel, H-alpha to the Green channel, and OIII to the blue channel. A top luminance layer taken from the Ha data was used to complete the image.

The average seeing at Mount Wilson over the five nights that data was collected for this image was 0.8 arc-seconds!

 

 

 

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No reproduction of these images are permitted without prior approval of the author.