vdB 142,IC1396 - Elephant Trunk Nebula

The Elephant's Trunk nebula is a concentration of interstellar gas and dust in the star cluster IC 1396 an ionized gas region 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 that is just to the west 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.

Photo Details

  Telescope: FSQ106EDX (530 mm) Takahashi

  Camera: Sbig ST-8300, Filter wheel, Baader 36mm LRGB filters

  Mount: NJP Takahashi

  Guiding: Off-axis SS Orion autoguider

  Exposure: H 25x1200sec L 16x480sec, R 8x480sec, G 8x480sec, B 8x480sec

  When: Summer 2012

  Other information: Ha taken in the city of Tarnow


Photo Details

   FSQ106EDX (530 mm) Takahashi

  Camera: Sbig ST-2000XM,XMC, Sbig Filter wheel, Baader 1.25" HLRGB filters

  Mount: NJP Takahashi

  Guiding: Self-guided

  Exposure: HaRGB 6h Total, Ha 9x1200sek, LRGB(XCM) 18x600sek

  When: ----

  Other information: good transparency, very good seeing, Ha taken with moon


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