SaratogaSkies Jim Solomon's Astropics


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NGC 6772 (Planetary Nebula)

Image Details:

Camera: SBIG ST-2000XM
Mount: Takahashi NJP
Scope: Takahashi Mewlon 180
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: Astrodon LRGB I-Series Filters
Effective Focal Length: 2160mm
Effective Focal Ratio: f/12
Exposure: L: 6 × 16min (1×1); RGB: 6 × 4min (3×3)
Total Exposure: 2hrs, 48min
Date: 9/13/2007 9:04 PM PDT (Start)
Location: Saratoga, CA, USA
Acquisition: CCDSoft
Focus: CCDSoft
Dithering: Manual
Guiding: Self Guided


  • IRIS: Dark subtraction, registration, gradient removal
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, LRGB combine, ASINH stretching
  • Neat Image: Noise Reduction
  • Photoshop: cropping, JPG conversion

Image Description:

This is NGC 6772, a planetary nebula n the constellation of Aquila. Maybe this one should be called “The Ugly Planetary” — or maybe it just needs more exposure or less binning. <grin> This is an LRGB composite, with the Luminance binned 1×1 and the color data binned 3×3. I probably won't bother to bin the color data in the future. North is up.