SaratogaSkies Jim Solomon's Astropics

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NGC 6210 (Planetary Nebula)

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Negative Projection (Barlowed)
Additional Optics: TeleVue 2x Barlow
Filter: None
Effective Focal Length: 2844mm
Effective Focal Ratio: f/14.2
Exposure: 88 x 60sec @ ISO 800
Total Exposure: 1hrs, 28min
Date: 7/14/2004, 11:30pm PDT
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: None
Guiding: None

Processing:

  • IRIS: Dark subtraction, flat field, registration, Kappa-Sigma stacking, Wavelet processing
  • Photoshop: Compositing, cropping, JPG conversion

Image Description:

NGC 6210 is a planetary nebula in the constellation of Hercules. I used IRIS's Wavelet Processing capabilities to bring out details in the nebula. However, that made the surrounding stars and the sky background look icky, a technical term. So I used Photoshop to composite the wavelet-processed nebula with a non-wavelet-processed background using layer masks. There, I feel much better for coming clean. <g> Also, I was very careful at every step of the aquisition and processing chain not to clip any of the nebula or its central star, in order to preserve the color and appearance of the nebula. This is a crop of the full-size image. North is up.

 
NGC 6781 (Planetary 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 6781 (Planetary Nebula)

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

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

Processing:

  • 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.