Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
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IC 1396 • Elephant's Trunk Nebula in HOO, 



    
        

            Douglas J Struble
IC 1396 • Elephant's Trunk Nebula in HOO
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IC 1396 • Elephant's Trunk Nebula in HOO

Getting plate-solving status, please wait...
IC 1396 • Elephant's Trunk Nebula in HOO, 



    
        

            Douglas J Struble
IC 1396 • Elephant's Trunk Nebula in HOO
Powered byPixInsight

IC 1396 • Elephant's Trunk Nebula in HOO

Equipment

Imaging Telescopes Or Lenses
Stellarvue SVX102T-R
Imaging Cameras
ZWO ASI1600MM-Cool
Mounts
Orion Atlas Pro AZ/EQ-G
Filters
Astrodon Ha 5nm · Astrodon OIII 3nm · Astronomik Ha 6nm 1.25''
Accessories
ZWO 8x 1.25" Filter Wheel (EFW) · QHYCCD PoleMaster · MoonLite CFL 2.5" Large Format Focuser
Software
PHD2 · Sequence Generator Pro · PixInsight · Stellarium · Photoshop CS5 · SkySafari Pro
Guiding Telescopes Or Lenses
Stellarvue 50mm Guidescope
Guiding Cameras
ZWO ASI224MC

Acquisition details

Dates:
June 11, 2017 ·  June 12, 2017 ·  May 19, 2019 ·  June 12, 2019
Frames:
Astrodon Ha 5nm: 53x240" (3h 32') (gain: 139.00) -20°C bin 1x1
Astrodon OIII 3nm: 40x240" (2h 40') (gain: 139.00) -20°C bin 1x1
Astrodon OIII 3nm: 210x120" (7h) (gain: 200.00) -20°C bin 1x1
Astronomik Ha 6nm 1.25'': 205x120" (6h 50') (gain: 200.00) -20°C bin 1x1
Integration:
20h 2'
Darks:
50
Flats:
50
Bias:
250
Avg. Moon age:
14.78 days
Avg. Moon phase:
90.74%
Bortle Dark-Sky Scale:
6.25

Basic astrometry details

Astrometry.net job: 3251699

RA center: 21h34m27s.1

DEC center: +57°3321

Pixel scale: 1.102 arcsec/pixel

Orientation: 267.882 degrees

Field radius: 0.725 degrees

Resolution: 3701x2959

Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard

Description

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. 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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IC 1396 • Elephant's Trunk Nebula in HOO, 



    
        

            Douglas J Struble