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NGC 7789 in Cassiopeia



Scope: Megrez II 80mm (FFIII) at f/5.9,  Location: Del Mar, CA   11 September 2007  Camera: Artemis285

Exposure: 15 x 60 sec Luminance with IR Block Filter (bin 1x1); 8 x 60 sec RGB (1x1 bin) 

Processing: Images were captured Artemis Capture (as FITs). Aligned/stacked and dark subtracted in Astroart with Sigma Combine. Luminance and Color channels were scaled and rough color balanced in Astroart. Central Gradient removal was performed in Astroart. Channels were co-registered in Astroart. The 60 sec IR block exposures were used as the main luminance construction with level adjustments and curves to bring out dim stars. Final LRGB combine was done in Photoshop.   Final touches were done in Photoshop.  Final Image size is approximately 1392x1040.

North is up in this image. NGC 7789 is an open cluster located in the constellation of Cassiopeia. This cluster is fairly old at an estimated 1.6 billion years old. The stars in this cluster are likely born at the same time (galactically  speaking). The brighter red stars are the more massive; they have exhausted their hydrogen fuel and are entering Red Giant phase. The cluster is at a distance of about 7,600 light years from Earth.  Horizontal FOV is 65'

Image center is approximately - Equatorial 2000: RA: 23h 57m 24s Dec: +5642'30"


All images and content remain the property of Jim Thommes - copyright 2003 - 2012

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