SaratogaSkies Jim Solomon's Astropics

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NGC 2841 (Spiral Galaxy)

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: 26 x 5min @ ISO 400
Total Exposure: 2hrs, 10min
Date: 4/11/2005 9:35:31 PM 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

Processing:

  • IRIS: Dark subtraction, flat field, registration, gradient removal
  • JimP: Kappa-Sigma Stacking, White balance, ASINH stretching
  • Photoshop: Levels, cropping, JPG conversion
  • Neat Image: Noise attenuation

Image Description:

This is NGC 2841, a spiral galaxy in the constellation of Ursa Major. This came out surprisingly well given the awful transparency, and considering that no less than 6 of the 26 frames had airplane trails in them! Amazingly, I was guiding on a double-star and it worked extremely well. Go figure. This is a crop of the full-size frame. North is up.