Elephant Trunk Nebula (IC 1396)

IC 1396
IC 1396: Elephant Trunk Nebula and Garnet Star in Cepheus; SMC Pentax 67 300 mm f/4.0 ED Green Star @ f/4.0; Canon EOS Ra; 10 Micron GM 2000 QCI Ultraportable; 36x5 min @ 800 ASA; Muri b. Bern, 515 m AMSL; © 10.-11. 8. 2021 Manuel Jung [45]
IC 1396
IC 1396: Elephant Trunk Nebula; Celestron RASA 11" f/2.22; ZWO ASI6200 Pro; Tentlingen; © 2020 Peter Kocher [33]
IC 1396
IC 1396: Elephant Trunk Nebula; Astrooptik Keller Cassegrain 400mm f/3, SBIG STL-11000M; Filter L + R + G + B + SII + Hα + OIII, total 12h; Observatory Oberes Schlierental, Obwalden; © 6.-11. 10. 2010 Eduard von Bergen [30]
IC 1396
IC 1396: Elephant Trunk with globule in IC 1396; 500 mm Cassegrain f=3625 mm f/7.2; SBIG STL11K; 120+3*40 min; Bernese Highlands; © 2011 Radek Chromik [32]

History

The galactic nebula IC 1396 was discovered photographically in August 1893 by the astronomer Edward Barnard. [196] The Canadian astronomer Sidney van den Bergh discovered a reflection nebula on the photo plates of the "Palomar Sky Survey" in the elephant trunk near the star BD + 57 ° 2309 (HD 239710), which he recorded as vdB 142 in his 1966 catalog of reflection nebulae. He noted: Type I-II (star partly inside, partly outside the nebula), moderate brightness, color blue, very strong absorption, radius 0.3 '(red) to 0.6' (blue). [255]

Physical Properties

IC 1396 is a large H-II region with an angular diameter of about 3°, which is home to areas of active star formation, so-called globules. The most noticeable globule is the Elephant Trunk Nebula (also often referred to as IC 1396A). This is illuminated by the trapezoid-like, variable O-type multiple star system HD 206267 located 4.5 pc away (see Fig. 3). According to Gaia DR2 measurements, this star is 945+90-73 pc from Earth. The main structure of IC 1396A measures approximately 5.4 arcminutes (about 1.4 pc) in diameter. Behind it, more dark globules and ionized, glowing gas extend over half a degree. This structure is only a small part of the large, bubble-shaped nebula around the star cluster Trumpler 37 or Collinder 439, which typically contains many variables for a young star cluster. [360, 361]

Revised+Historic NGC/IC Version 22/9, © 2022 Dr. Wolfgang Steinicke [277]
Name RA Dec Type bMag vMag B-V SB Dim PA z D(z) MD Dreyer Description Identification, Remarks
IC 1396 21 38 54.0 +57 29 20 EN 170 × 140 0.800 Neb part of M. Way LBN 451/452, SG 1.19
IC 1396 A 21 35 30.0 +57 23 00 EN 14 × 2 Neb part of M. Way LBN 452
IC 1396 B 21 34 30.0 +57 28 00 EN 12 × 4 Neb part of M. Way LBN 451

Finder Chart

The galactic nebula IC 1396 is located in the constellation Cepheus, which is best visible from May to December.

Finder Chart Elephant Trunk Nebula (IC 1396)
Elephant Trunk Nebula (IC 1396) in constellation Cepheus. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

More Objects Nearby (±15°)

References

  • [30] AOAsky: Astrobilder aus der Sternwarte Oberes Schlierental; aoasky.ch/verein/1d_astrobilder.html
  • [32] Astrofotografie by Radek, Bernie and Dragan; sternwarte.ch
  • [33] Sternwarte Tentlingen MPC A16, Peter Kocher; astropeter.ch
  • [45] Astro-, Landschafts- und Reisefotografie sowie Teleskopbau, Manuel Jung; sternklar.ch
  • [149] SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
  • [160] The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
  • [196] Celestial Atlas by Curtney Seligman; cseligman.com/text/atlas.htm (2020-12-28)
  • [255] «A study of reflection nebulae» van den Bergh, S.; Astronomical Journal, Vol. 71, p. 990-998 (1966); DOI:10.1086/109995; cdsarc.unistra.fr/viz-bin/cat/VII/21 (2021-01-30)
  • [277] «Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
  • [360] «Near-infrared Variability of Low-mass Stars in IC 1396A and Tr 37» Huan Y. A. Meng, G. H. Rieke, Jinyoung Serena Kim, Aurora Sicilia-Aguilar, N. J. G. Cross, Taran Esplin, L. M. Rebull, and Klaus W. Hodapp; Published 2019 June 6; The Astrophysical Journal, Volume 878, Number 1; DOI:10.3847/1538-4357/ab1b14
  • [361] «IRAM and Gaia views of multi-episodic star formation in IC 1396A — The origin and dynamics of the Class 0 protostar at the edge of an HII region» Aurora Sicilia-Aguilar, Nimesh Patel, Min Fang, Veronica Roccatagliata, Konstantin Getman and Paul Goldsmith; A&A Volume 622, February 2019; DOI:10.1051/0004-6361/201833207