Elephant’s Trunk nebula, IC 1396 SHO


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.

Imaging telescopes or lenses: Sky-Watcher Equinox 120/900 ED APO
Imaging cameras: QHY CCD ALCCD 8L
Mounts: Skywatcher NEQ 6 PRO
Guiding telescopes or lenses: Lacerta Off-Axis-Guider (extra short) T2 Guide-Cam connector
Guiding cameras: Lacerta M-Gen MGEN II
Focal reducers: Skywatcher .85x Focal Reducer & Corrector
Software: MSB AstroArt 5, Adobe Photoshop CC 14
Filters: Baader Planetarium HA 36mm 7nm Filter, Baader Planetarium OIII 36mm 8,5nm Filter, Baader Planetarium SII 36mm 8nm Filter
Accessories: Filterschublade T2-T2 36mm, LACERTA MGEN Autoguider, V 2.12
Resolution: 2229×1535
Dates: Dec. 15, 2014
Frames: 20×600″ -15C bin 1×1
Integration: 3.3 hours
Darks: ~20
Flats: ~20
Flat darks: ~20
Bias: ~20
Avg. Moon age: 22.56 days
Avg. Moon phase: 45.62%
Bortle Dark-Sky Scale: 4.00
RA center: 323.532 degrees
DEC center: 57.609 degrees
Pixel scale: 2.513 arcsec/pixel
Orientation: -86.739 degrees
Field radius: 0.945 degrees

Author:  Burkhard