SaratogaSkies Jim Solomon's Astropics


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NGC 2903 (Barred Spiral Galaxy)

Click to see high-res version.

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: 35 x 5min @ ISO 800
Total Exposure: 2hrs, 55min
Date: 3/30/2005 8:56:31 PM PST (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, gradient removal
  • JimP: Kappa-Sigma Stacking, White balance, ASINH stretching
  • Photoshop: Levels, image size, cropping, JPG conversion
  • Neat Image: Noise attenuation on galaxy closeup

Image Description:

The large galaxy in the lower right is NGC 2903, a rather photogenic Barred Spiral galaxy in the constellation of Leo. The smaller spiral galaxy in the upper left is NGC 2916. Those with good eyes might be able to pick out PGC 27115, aka UGC 5086, the (very) faint smudge just to the left of NGC 2903. (Hey, it's a dwarf galaxy, and it's Mag 16. ) Also barely visible is PGC 27249 (aka ZWG 122.022), the thin slit just below and left of NGC 2916 (Mag 15.7).

The seeing was pretty good the night this was shot. The transparency was pretty lousy. The image on this page is a slight crop of the full frame, scaled for display on the web. See also the full-resolution image. North is up.