My second attempt at IC1396. Astrospheric forecasted 0% cloud cover Sunday night, but I had to wait for about 2 hours after sunset before the clouds cleared.  I was going to go back to the Bubble Nebula and then move to NGC2264 around 02:00, but I decided on IC1396.  Once the clouds cleared, it looked like I would have clear skies until the morning, so I started imaging IC1396 at 600 second exposures, thinking I would get about 30 subs.   However, clear sky was not to be for around 23:30 the clouds rolled in for the night so I had to quit at 14 images, but the 14th was all cloud so reality only 13 subs at 600 seconds.  

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, the 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.[2][3]

references:

1. Matthews, HI (1979). "High resolution radio observations of bright rims in IC 1396". Astronomy and Astrophysics. 75: 345–50. Bibcode:1979A&A....75..345M.
2. Barentsen, G (2011). "T Tauri candidates and accretion rates using IPHAS: method and application to IC1396". Monthly Notices of the Royal Astronomical Society. 415 (1): 103–32. arXiv:1103.1646. Bibcode:2011MNRAS.415..103B. doi:10.1111/j.1365-2966.2011.18674.x. S2CID27173042.
3. Getman, KV; Feigelson, ED; Sicilia-Aguilar, A; Broos, PS; Kuhn, MA; Garmire, GP (2012). "The Elephant Trunk Nebula and the Trumpler 37 cluster: contribution of triggered star formation to the total population of an H II region". Monthly Notices of the Royal Astronomical Society. 426 (4): 2917–43. arXiv:1208.1471. Bibcode:2012MNRAS.426.2917G. doi:10.1111/j.1365-2966.2012.21879.x. S2CID49528100.

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