Search
Latest news
December: Test shots with new scopes/mounts
Dec 21: TMB 80/480 Arrives!
Dec 3: AP1200 Arrives!
Nov 30: TMB 152/1200 Arrives!
Links:
B33 (Horsehead Nebula)
| |
| Mouse-over to see annotations. (Requires Javascript) Click to see high-res version. |
Image Details:
- Camera: SBIG ST-2000XM
- Mount: Astro-Physics 1200GTO
- Scope: TMB 152/1200 APO Refractor
- Configuration: Prime Focus
- Additional Optics: n/a (Prime)
- Filter: Astrodon SII, Hα, OIII 6nm Filters
- Effective Focal Length: 1200mm
- Effective Focal Ratio: f/7.9
- Exposure: {5 SII, 5 Hα, 5 OIII} × 32min @ -20°C
- Total Exposure: 8hrs, 0min
-
- Date: 2/7/2008 8:19 PM PST, 2/8/2008 7:20 PM PST (Start)
- Location: Saratoga, CA, USA
- Acquisition: CCD Commander
- Focus: FocusMax
- Dithering: CCD Commander
- Guiding: Self Guided
Processing:
- IRIS: Registration
- JimP: Dark subtraction, Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
- Photoshop: JPG conversion
- Neat Image: Noise reduction
Image Description:
This is B33, aka, the “Horsehead Nebula”, a dark nebula silhouetted against the bright nebula IC 434 in the constellation of Orion. Compare this closeup with the true color, wide-field, DSLR image, which shows the Horsehead in context with the bright belt star, Alnitak.
Mousing off the image reveals a “Hubble Palette” narrowband image, with
R:G:B = SII:Hα:OIII . Mouse-over the image to see the H-alpha only image in grayscale. A higher resolution image is also available. North is left.