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 6804 (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 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: 9/14/2007 9:27pm PDT
Location: Saratoga, CA, USA
Acquisition: CCDSoft
Focus: CCDSoft
Dithering: Manual
Guiding: Self Guided

Processing:

  • IRIS: Dark subtraction, registration, gradient removal
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, LRGB combine, ASINH stretching
  • CCDSharp: Richardson-Lucy deconvolution
  • Photoshop: Neil's Trick, cropping, JPG conversion

Image Description:

This is NGC 6804, a planetary nebula n the constellation of Aquila. Had some tracking/focus/both problems in the acquisition of this image, but Neil Fleming's Star Trail Removal trick worked very well, after applying a generous dose of deconvolution in CCDSharp. This is an LRGB composite, with the Luminance binned 1×1 and the color data binned 3×3. A higher resolution image is also available. North is up.

 
M20 (Trifid 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:

M20 (Trifid Nebula)   [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: 24 x 1min @ ISO 800
Total Exposure: 0hrs, 24min
Date: 7/11/2004, ~1:30am PDT
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: None
Guiding: None

Processing:

  • IRIS: Dark subtraction, flat frame, registration, and Kappa-Sigma stacking
  • Photoshop: Noise reduction, crop (1/2 x), image scale (1/2 x), JPG conversion

Image Description:

Another stunning object in the "summer" Milky Way. This is the Trifid Nebula, yet another gem in the constellation of Sagittarius. This is a Sigma stack of the best 24 of the 30 frames (the remaining 6 showed trailing/smearing due to tracking error). Interestingly, "dark subtraction" yielded a worse image than just stacking the un-dark-subtracted frames. I need to look into this. North is up.