SaratogaSkies Jim Solomon's Astropics

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December: Test shots with new scopes/mounts

Dec 21: TMB 80/480 Arrives!

Dec 3: AP1200 Arrives!

Nov 30: TMB 152/1200 Arrives!

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NGC 4725 (Spiral Galaxy)

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: 20 x 8min @ ISO 400
Total Exposure: 2hrs, 40min
Date: 5/16/2007 9:28:57 PM PDT (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
  • Photoshop: Sharpening, levels, cropping, JPG conversion
  • Neat Image: Noise reduction

Image Description:

This is NGC 4725, aka, the “One Armed Galaxy”, a spiral galaxy in the constellation of Coma Berenices. NGC 4725 is a Seyfert Galaxy, suggesting an active galactic nucleus containing a supermassive black hole. A higher resolution image is also available. North is up.

 
NGC 6888 (Crescent Nebula)
SaratogaSkies Jim Solomon's Astropics

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:

NGC 6888 (Crescent 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 Hα 6nm Filter
Effective Focal Length: 1200mm
Effective Focal Ratio: f/7.9
Exposure: 6 × 32min @ -15°C (Hα)
Total Exposure: 3hrs, 12min
Date: 6/12/2008 11:49 PM PDT (Start)
Location: Saratoga, CA, USA
Acquisition: CCDSoft
Focus: FocusMax
Dithering: Manual
Guiding: Self Guided

Processing:

  • IRIS: registration
  • JimP: Dark subtraction, Flat Field, Kappa-Sigma Stacking, ASINH stretching
  • Photoshop: JPG conversion

Image Description:

This is an Hα image of NGC 6888, aka, the “Crescent Nebula”, an emission nebula in the constellation of Cygnus. This is a “work in progress”, as I will be adding other emission-line data in the future. Check out my color DSLR shot to see this object in color. A higher resolution image is also available. North is up.