SaratogaSkies Jim Solomon's Astropics


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NGC 6823 (Open Cluster)   [obsolete]

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 4 x 10min @ ISO 100
Total Exposure: 0hrs, 40min
Date: 8/16/2004, ~12:30am PDT
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: None
Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow


  • IRIS: Dark subtraction, flat field, registration, Kappa-Sigma stacking
  • Photoshop: Levels, image size, cropping, JPG conversion

Image Description:

NGC 6823 is a small open cluster in the constellation of Vulpecula. I tried to capture the faint nebula NGC 6820 upon which this open cluster is superimposed, but the conditions just wouldn't support it. (Use your imagination and you'll be able to see a trace of it.) Many thanks to my neighbor for turning on his flood lights as I was shooting this object. Grrrrr. <grin> That's ok, because this was yet another set of test shots as I try to debug my autoguiding setup. This is a 50pct crop of the full-size frame, scaled for display on the web. North is up.