Image Credit & Copyright: Bob and Janice Fera (Fera Photography)
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 constellation Canis 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.
APOD NASA 15-feb-2014
The Elephant’s Trunk nebula is a concentration of interstellar gas and dust within the much larger ionized gas region IC 1396 located in the constellation Cepheus about 2,400 light years away from Earth. The piece of the nebula shown here is the dark, dense globule IC 1396A; it is commonly called the Elephant’s Trunk nebula because of its appearance at visible light wavelengths, where there is a dark patch with a bright, sinuous rim. The bright rim is the surface of the dense cloud that is being illuminated and ionized by a very bright, massive star that is just to the west of IC 1396A. (In the Figure above, the massive star is just to the left of the edge of the image.) The entire IC 1396 region is ionized by the massive star, except for dense globules that can protect themselves from the star’s harsh ultraviolet rays.
Imaging telescopes or lenses: Takahashi FSQ-85EDX, Takahashi CCA-250
Imaging cameras: QHYCCD QHY22, Apogee Aspen 16M
Mounts: Software Bisque Paramount ME, Astro-Physics Mach 1 GTO
Filters: Astrodon Ha 3nm, Astrodon 3nm SII, Astrodon 3nm OIII
Dates: Nov. 10, 2013, Nov. 28, 2013
Astrodon 3nm OIII: 8×1200″ bin 1×1
Astrodon 3nm OIII: 8×1200″ bin 2×2
Astrodon 3nm SII: 8×1200″ bin 1×1
Astrodon 3nm SII: 8×1200″ bin 2×2
Astrodon Ha 3nm: 15×1200″ bin 1×1
Integration: 15.7 hours
Autor: Craig Prost
AstroPhotography of the day by SPONLI
15 February 2014
We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.