IC1396: the Elephant’s Trunk nebula

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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
Frames:
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

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15 February 2014

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