SaratogaSkies Jim Solomon's Astropics


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NGC 6781 (Planetary Nebula)

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Image Details:

Camera: SBIG ST-2000XM
Mount: Takahashi NJP
Scope: Takahashi Mewlon 180
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: Astrodon RGB I-Series Filters
Effective Focal Length: 2160mm
Effective Focal Ratio: f/12
Exposure: L: 21 × 8min (1×1); RGB: 7 × 8min (1×1)
Total Exposure: 5hrs, 36min
Date: 8/15/2007 9:21pm PDT (L), 9/4/2007 9:30pm PDT (RGB)
Location: Saratoga, CA, USA
Acquisition: CCDSoft
Focus: CCDSoft
Dithering: Manual
Guiding: Self Guided


  • IRIS: Dark subtraction, registration, gradient removal li>JimP: Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
  • CCDStack: R-L, LRGB combine
  • Photoshop: scaling, JPG conversion

Image Description:

This is NGC 6781, a planetary nebula n the constellation of Aquila. After a couple of false starts trying to figure out the new camera, scope, and mount, this one came in pretty well on a night of only average to below average seeing and transparency. A higher resolution image is available. North is up.