Urban Elephant Trunk

Here is another urban image taken from my driveway. IC1396, also known as the Elephant Trunk Nebula is a reasonably bright emission nebula in Cepheus. This shot was taken using an Optolong L-eNhance light pollution filter from my urban light polluted skies.

According to Wikipedia -  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 (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.

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Object Elephant Trunk Nebula (IC1396)  RA 21:39 Dec 57:30
Date 3 August, 2020
Exposure 4.5 hours  (18 X 10 minutes + 18 X 5 minutes)
Conditions Bortle 7 skies, high light pollution levels with an almost full Moon in the sky.
ISO 800
Camera Canon 60Da DSLR
Optics Prime focus of a  SkyWatcher Esprit 120 f/7 APO refractor with a focal length of 840 mm
Filter Optolong L-eNhance
Location Bedford, Nova Scotia
Processing This image was captured using Sequence Generator Pro, telescope control provided by Mosaic Engine and processed entirely in Images Plus.  Arcsinh stretch,  masked noise reduction applied to the nebula layer. root N stretch, sharpening using a frequency domain high pass filter. The colour was corrected using the  colour balance tool and selecting a white star. The image was cropped and binned by two for web display.