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NGC 7023 (Iris Nebula)
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| Mouse-over to see annotations. (Requires Javascript) Click to see high-res version. |
Image Details:
- Camera: Mofidied Canon Rebel XT (350D): Hutech Type I Filter Replacement
- 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: 42 x 4min @ ISO 400
- Total Exposure: 2hrs, 48min
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- Date: 10/29/2005 9:28:47 PST (start)
- Location: Saratoga, CA, USA
- Acquisition: DSLRfocus
- Focus: DSLRFocus
- Dithering: GADFly 1.0.5
- 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
- Neat Image: Noise reduction
- Photoshop: Levels, cropping, JPG conversion
Image Description:
This is NGC 7023, aka the Iris Nebula, in the constellation of Cepheus. This is my first auto-dithered image, using an adaptation of GADFly, originally written by TG Tan. The transparency was pretty lousy the night this was shot, and removing the background gradient was quite a challenge. A higher-resolution image is also available. North is up.