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The "Elephant Trunk" nebula in IC 1396 in Cepheus

© 2017 Klaus Brasch

Although it was cold (28 F!) and seeing was just fair, transparency was excellent last night. I finally captured enough frames of one of my favorite deep sky objects, the "Elephant Trunk" nebula in IC 1396 in Cepheus, with my new Plane Wave 12.5-inch. Shooting with the modified Canon 6D, and IDAS LPS V4 filter at ISO 3200-6400, this composite consist of about 10 x 5 minute frames. This faint object is not visible by eye even through a large telescope, but records well photographically.






The following was retrieved from Wikipedia, the free encyclopedia, at https://en.wikipedia.org/wiki/Elephant%27s_Trunk_nebula on October 23, 2017

The Elephant's Trunk nebula

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.[1] 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 (HD 206267) that is just to the east of IC 1396A. (In the Spitzer Space Telescope view shown, 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.

The Elephant's Trunk nebula is now thought to be a site of star formation, containing several very young (less than 100,000 yr) stars that were discovered in infrared images in 2003. Two older (but still young, a couple of million years, by the standards of stars, which live for billions of years) stars are present in a small, circular cavity in the head of the globule. Winds from these young stars may have emptied the cavity.

The combined action of the light from the massive star ionizing and compressing the rim of the cloud, and the wind from the young stars shifting gas from the center outward lead to very high compression in the Elephant's Trunk nebula. This pressure has triggered the current generation of protostars.

The license terms of this written work from Wikipedia may be found at https://creativecommons.org/licenses/by-sa/3.0/






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