Elephant Trunk Nebula Photograph by Peter Kennett

Elephant Trunk Nebula

by Peter Kennett

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Title

Elephant Trunk Nebula

Artist

Peter Kennett

Medium

Photograph - Photography

Description

The Elephant's Trunk Nebula (IC1396) is a concentration of interstellar gas and dust located in the constellation Cepheus about 2,400 light years away from Earth. The piece of the nebula shown here enlarged 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. 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 yrs) 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. Stellar radiation 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.

For a comparison of the size of this nebula in the sky above, the full moon has about the same diameter as just the "trunk" part of this nebula complex. this takes up a lot of space in our sky at night.

Ioptron CEM25P
ASI 1600MM Pro (-15c)
William Optics Star71 (71mm, f.4.9, 348mm focal length)
Lodestar X2 on an OAG
Kstars/EKOS (Mac OSX)
PixInsight

Exposures:
- Ha: 92 x 120 sec. (Green)
- OIII: 154 x 120 sec (Blue)
- SII: 45 x 180 sec + 63 x 120 sec (Red)