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Scope: C8 f/4.2; Location: Del Mar, CA; 29 September 2005; Camera:
Artemis285
Exposure: 12 x 60 sec Luminance exposure (bin 1x1)with Baader IR Block Filter;
10 x 45 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 60 sec exposures were used as
the main luminance 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. Color
balancing and final touches were done in Photoshop. SGBNR was used to smooth background noise on the
luminance construction.
Final Image size is approximately 1392x1040
This image was guided; North is up. NGC 6811 is an open cluster in the
constellation of Cygnus. It is somewhat inconspicuous in that it lies in the
rich star field of the Milky Way. In this image, the color is somewhat
emphasized - this helps to spot the member stars in the cluster - they tend to
bluish hues. This image replaces an earlier image that can be
seen in the Archives here. Horizontal FOV is
36'
Image Center is approximately - Equatorial 2000: RA: 19h 37m 18s Dec: +46°22'55"