SaratogaSkies Jim Solomon's Astropics

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M42 (The Great Nebula in Orion)   [obsolete]

Image Details:

Camera: Nikon D100
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: 1 x 60sec @ ISO 1600 (nebula), 1 x 10sec @ ISO 1600 (trapezium)
Total Exposure: 0hrs, 1min
Date: 3/22/2004, 8:45 PST
Location: Saratoga, CA, USA
Acquisition: Manual
Focus: Manual
Dithering: None
Guiding: None

Processing:

  • Photoshop: Dark subtracktion, registration, compositing, levels, color balance, image scale (1/4 x), JPG conversion

Image Description:

This is my first ever DSLR image! Thanks much to Jon L. for letting me borrow his Nikon D100.

Some interesting notes about this image. The vertical "trail" at the bottom, center of the image is a diffraction spike from the bright, mag 2.5, star, Iota Orionis, which is just south of the field of view of this photo. The faint, horizontal line in the lower-right portion of the image is a meteor trail or a photographic defect. Not sure which. The distinct nebula above the main one is M43.

 
PLN85+4.1 (HII Region)
SaratogaSkies Jim Solomon's Astropics

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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:

PLN85+4.1 (HII Region)

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

Image Details:

Camera: SBIG ST-2000XM
Mount: Astro-Physics 1200GTO
Scope: AP Starfire 160EDF APO Refractor
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: Astrodon LRGB I-Series Filters
Effective Focal Length: 1200mm
Effective Focal Ratio: f/7.5
Exposure: 9 × 32min @ -20°C (Hα); 8 × 8min @ -20°C (RGB)
Total Exposure: 8hrs, 0min
Date: 7/23/2010 (Hα), 8/4/2010 (RGB)
Location: Saratoga, CA, USA
Acquisition: CCD Commander
Focus: FocusMax
Dithering: CCD Commander
Guiding: Self Guided

Processing:

  • IRIS: Registration, gradient removal
  • JimP: Dark subtraction, Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
  • Photoshop: Hα and RGB combining, JPG conversion

Image Description:

This is PLN85+4.1, an HII region in the constellation of Cygnus. I thought this was a Planetary Nebula, cuz that’s what TheSky said it was, but upon further review and research, including Anthony Ayiomamitis’ excellent image and writeup, it's just a glowing cloud of HII. Oh well. Hα and RGB combined in Photoshop using the “Lighten” method, which worked better than the other methods I tried. Mouse over for the Hα-only version. A higher-resolution image is also available. North is up.