|Object:||IC 1396A - Elephant trunk|
|Date of exposures:||08.05.2017|
|Exposures:||Ha: 26 x 600 Sec., O[III]: 3 x 600 Sec., S[II]: 6 x 600 Sec., Sum. 5,2 hrs.|
|Telescope:||10'', F4 Newton|
|Focal length:||1000 mm|
|Filter:||Astrodon H-Alpha 5nm, [OIII] 3nm|
|Guiding:||Off Axis Guider, Lodestar|
The elephant trunk nebula, also known under the catalog name IC 1396A, is a lightly glowing globule, a collection of interstellar gas and dust, in the constellation of Cepheus. The globule belongs to IC 1396, an H-II region with an embedded star cluster, and is about 2,400 light years away from Earth. The nebula is an active star formation area and contains a series of young stars and protostars that are between 100,000 and a million years old. In front of the globule is the reflection nebula van den Bergh 142 (vdB 142), which is very probably physically related. This reflection nebula is irradiated by the B3 star HD 239710.
At the tip of the cone is a pair of stars (LkHa 349 and LkHa 349c) that produced a hollow (orange) in the globule. Investigations with the Spitzer telescope in infrared light showed that the star weakened in the visible light is surrounded by a dust disk, which is regarded as the precursor of a planetary system.
If you like to see the trunc in portrait mode, here is the link: ic1396a-hubble-small-portrait.jpg