Contains:IC 1396
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Elephant's Trunk, 




    

        Roberto Colombari
Elephant's Trunk

Elephant's Trunk

Technical card

Resolution: 3280x2442

Astrometry.net job: 883981

RA center: 323.806 degrees

DEC center: 57.408 degrees

Pixel scale: 2.093 arcsec/pixel

Orientation: -90.984 degrees

Field radius: 1.189 degrees

Data source: Unknown

Description

IC1396
This is a narrow composition using frames recorded at DeepSkyWest.

Ha: 16x1800s
SII: 16x1800s
OIII: 16x1800s

Copyright: R. Colombari
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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.[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 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.
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.[2]

Source: Wikipedia

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rob77
Roberto Colombari
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Elephant's Trunk, 




    

        Roberto Colombari

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