Daily Archives: January 17, 2015

IC 1396A, 1396 Nebula, Elephants Trunk


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 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: Teleskop-Service TS APO65Q
Imaging cameras: Canon EOS 1100Da
Mounts: Syntha NEQ6
Guiding telescopes or lenses: Teleskop-Service TS APO65Q
Guiding cameras: Lacerta MGEN
Software: DSS 3.3.4,  Adobe Photoshop CS6, FitsWork 4
Filters: Hutech IDAS 2″ LPS-P2
Resolution: 1920×1380
Dates: Dec. 1, 2013,  Dec. 31, 2014
Hutech IDAS 2″ LPS-P2: 47×600″ ISO200
Hutech IDAS 2″ LPS-P2: 13×900″ ISO200
Integration: 11.1 hours
Darks: ~35
Flats: ~60
Bias: ~60
Avg. Moon age: 18.49 days
Avg. Moon phase: 39.57%
RA center: 324.526 degrees
DEC center: 57.471 degrees
Pixel scale: 4.058 arcsec/pixel
Orientation: -113.688 degrees
Field radius: 1.333 degrees
Author: Jonas Illner