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M97 & M108 (Owl Nebula & Galaxy)
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| 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: 34 x 5min @ ISO 800
- Total Exposure: 2hrs, 50min
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- Date: 5/2/2005 9:47:05 PM PDT (start)
- 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
Processing:
- IRIS: Dark subtraction, registration, gradient removal
- JimP: Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
- Photoshop: Levels, cropping, JPG conversion
Image Description:
This is M97, aka, the Owl Nebula (lower right) and M108, an edge-on spiral galaxy (upper left), both in the constellation of Ursa Major. Conditions were pretty good this night but I went to play ice hockey instead of sitting around here dithering between each frame. That lack of dithering resulted in some pattern noise in the background, which further limited the amount of ASINH stretching that could be done. At least we won the hockey game. <grin> This is the full frame, scaled for display on the web. A higher-resolution image is also available. North is left.