SaratogaSkies Jim Solomon's Astropics

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SH 2-27 (Emission Nebula East)

Mouse-over to see annotations. (Requires Javascript) Click to see high-res version.

Image Details:

Camera: Mofidied Canon Digital Rebel (300D): Hutech (no filter)
Mount: Celestron AS-GT
Scope: Canon EF 200mm f/2.8L II USM lens
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: None
Effective Focal Length: 200mm
Effective Focal Ratio: f/2.8
Exposure: 33 x 4min @ ISO 200
Total Exposure: 2hrs, 12min
Date: Date: 7/2/2005 9:44:35 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, registration, gradient removal
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
  • Photoshop: Levels, image scale, cropping, clone tool, JPG conversion

Image Description:

This is the Eastern portion of SH 2-27, a very large but very faint emission nebula in the constellation of Ophiuchus. Thanks much to Rich S. for letting me borrow his Modified 300D, without which I would not have been able to capture any of the red Hα nebulosity. Unfortunately, only after the fact, did I discover that there was a pretty obnoxious globber on the camera's sensor that moved (!) between the time I captured the Lights and Flats, so I had to do some unholy clone-tool operations in Photoshop to clean it up. There, I feel much better for coming clean on this. <grin>

Move your mouse over the image above to see annotations of the various dark-nebula regions, or click on the image for a higher-resolution version. The image above is the full frame, shrunk for display on the web. North is right.

 
NGC 6823 (Open Cluster)
SaratogaSkies Jim Solomon's Astropics

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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:

NGC 6823 (Open Cluster)   [obsolete]

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 4 x 10min @ ISO 100
Total Exposure: 0hrs, 40min
Date: 8/16/2004, ~12:30am PDT
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, flat field, registration, Kappa-Sigma stacking
  • Photoshop: Levels, image size, cropping, JPG conversion

Image Description:

NGC 6823 is a small open cluster in the constellation of Vulpecula. I tried to capture the faint nebula NGC 6820 upon which this open cluster is superimposed, but the conditions just wouldn't support it. (Use your imagination and you'll be able to see a trace of it.) Many thanks to my neighbor for turning on his flood lights as I was shooting this object. Grrrrr. <grin> That's ok, because this was yet another set of test shots as I try to debug my autoguiding setup. This is a 50pct crop of the full-size frame, scaled for display on the web. North is up.