NGC 7790 and NGC 7788 in Cassiopeia



Scope: C8   f/4.1; Location:  Del Mar, CA;  10 September, 2006; Camera: Artemis285

Exposure: 10 x 120 sec Luminance exposure (bin 1x1)  with Baader IR Block Filter; 8 x 60 sec RGB (bin 2x2) 

Processing: Images were captured Artemis Capture (as FITs). Aligned/stacked in Registax 3 and saved as FITS. 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 120 sec 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.  Luminance Layering (LLRGB) was used  to bring out star colors. Final touches were done in Photoshop.  Final Image size is approximately 1392x1040

This image was guided; North is up. NGC 7790 and NGC 7788 are open clusters in the constellation of Cassiopeia. They are at least visually closely aligned, however, their distances from Earth is uncertain.  Cluster NGC 7790 is in the lower left; NGC 7788 is in the upper right. NGC 7790 is astronomically important in that it contains three classical Cephid variable stars - as such it could help determine a zero distance point for these special stars used in galactic distance measurement. Horizontal FOV is 38'

Image Center is approximately - Equatorial 2000: RA: 23h 57m 33s Dec: +6116'48"


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