SaratogaSkies Jim Solomon's Astropics

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M17 (Omega Nebula)

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

Image Details:

Camera: Mofidied Canon Rebel XT (350D): Hutech Type I Filter Replacement
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: Celestron/Baader Multi Purpose Coma Corrector (MPCC)
Filter: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 18 x 4min @ ISO 400
Total Exposure: 1hrs, 12min
Date: 8/21/2006 9:28:12 pm PDT (start)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: GADFly 1.0.5
Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow

Processing:

  • IRIS: Dark subtraction, registration, gradient removal
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
  • Photoshop: Levels, cropping, JPG conversion

Image Description:

This is M17, aka, the Swan/Checkmark/Horseshoe/Omega Nebula in the constellation of Sagittarius. This is a do-over of my ancient version, one of the first images I captured with my (unmodified) Digital Rebel back in 2004. The current image is decent, considering the horrible conditions under which it was captured: the transparency and seeing were quite awful, and all the equipment was dripping with dew. Not bad considering. A higher resolution image is also available. North is up.