Daily Archives: February 25, 2015

NGC 2359 – Thor’s Helmet


This helmet-shaped cosmic cloud with wing-like appendages is popularly called Thor’s Helmet. Heroically sized even for a Norse god, Thor’s Helmet is about 30 light-years across. In fact, the helmet is more like an interstellar bubble, blown as a fast wind from the bright, massive star near the bubble’s center sweeps through a surrounding molecular cloud. Known as a Wolf-Rayet star, the central star is an extremely hot giant thought to be in a brief, pre-supernova stage of evolution. Cataloged as NGC 2359, the nebula is located about 15,000 light-years away in the constellationCanis Major. The sharp image, made using broadband and narrowband filters, captures striking details of the nebula’s filamentary structures. It shows off a blue-green color from strong emission due to oxygen atoms in the glowing gas.

Imaging telescopes or lenses: Celestron EdgeHD 1100
Imaging cameras: Starlight Xpress SXVR-M25C
Mounts: CGEM
Guiding telescopes or lenses: Celestron EdgeHD 1100
Guiding cameras: Lodestar
Focal reducers: Celestron .7x Focal Reducer Celestron f7
Software: Adobe Photoshop CS2 Photoshop CS2,  MaximDL 5
Filters: Baader UHC-S
Accessories: Starlight Xpress SXV-AOL
Resolution: 2907×1816
Dates: Feb. 8, 2015
Frames: 56×1200″
Integration: 18.7 hours
Avg. Moon age: 18.35 days
Avg. Moon phase: 86.12%
RA center: 109.631 degrees
DEC center: -13.218 degrees
Pixel scale: 0.821 arcsec/pixel
Orientation: 90.011 degrees
Field radius: 0.391 degrees
Locations: Home Observatory, Oklahoma City, Oklahoma, United States
Author: army5
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