SaratogaSkies Jim Solomon's Astropics


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NGC 7331 (Deer Lick Group and Stephan's Quintet)

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Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: Celestron/Baader Multi Purpose Coma Corrector (MPCC)
Filter: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 15 x 8min @ ISO 400
Total Exposure: 2hrs, 0min
Date: 9/22/2004, ~12:40am PDT (start)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: Manual
Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow


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

Image Description:

This is a rich field of galaxies in the constellation of Pegasus. The two major groupings are the Deer Lick Group, in the upper-left, and Stephan's Quintet in the lower-right. NGC 7331 is the largest and most obvious galaxy in this picture, and is the "showcase piece" in the Deer Lick Group. The tracking seemed a bit better in the frames of this image versus previous ones, perhaps due to the insertion of the barlow lens in the guide scope, doubling its effective focal length. This is a composite crop of both galaxy groups at roughly 75% size. A full-resolution image is also available. North is up.