Detail View: NASA Spitzer Space Telescope Collection:

Title: 
Dark Globule in IC 1396
Description: 
NASA's Spitzer Space Telescope image of a glowing stellar nursery provides a spectacular contrast to the opaque cloud seen in visible light. The Elephant's Trunk Nebula is an elongated dark globule within the emission nebula IC 1396 in the constellation of Cepheus. Located at a distance of 2,450 light-years, the globule is a condensation of dense gas that is barely surviving the strong ionizing radiation from a nearby massive star. The globule is being compressed by the surrounding ionized gas. The dark globule is seen in silhouette at visible-light wavelengths, backlit by the illumination of a bright star located to the left of the field of view. The Spitzer Space Telescope pierces through the obscuration to reveal the birth of new protostars, or embryonic stars, and previously unseen young stars. The infrared image, which transforms the dark cloud into a 'flying dragon,' was obtained by Spitzer's infrared array camera. The image is a four-color composite of invisible light, showing emissions from wavelengths of 3.6 microns (blue), 4.5 microns (green), 5.8 microns (orange) and 8.0 microns (red). The filamentary appearance of the globule results from the sculpting effects of competing physical processes. The winds from a massive star, located to the left of the image, produce a dense circular rim comprising the 'head' of the globule and a swept-back tail of gas. A pair of young stars (LkHa 349 and LkHa 349c) that formed from the dense gas has cleared a spherical cavity within the globule head. While one of these stars is significantly fainter than the other in the visible-light image, they are of comparable brightness in the infrared Spitzer image. This implies the presence of a thick and dusty disc around LkHa 349c. Such circumstellar discs are the precursors of planetary systems. They are much thicker in the early stages of stellar formation when the placental planet-forming material (gas and dust) is still present.
Release Date: 
2003/12/18
Press Release: 
NASA Releases Dazzling Images from New Space Telescope [ http://www.spitzer.caltech.edu/Media/releases/ssc2003-06/release.shtml ]
Release Credit: 
NASA/JPL-Caltech/W. Reach (SSC/Caltech)
Image Credit: 
NASA/JPL-Caltech/W. Reach (SSC/Caltech)
Object name: 
IC 1396 Globule
Object type: 
Dark globule inside emission nebula, Star forming region
Position (J2000): 
*RA: *21h38m8.70s *Dec: *57d26m48.00s
Distance: 
2,450 light-years (750 parsecs)
Constellation: 
Cepheus (the King)
Wavelength: 
3.6 (blue), 4.5 (green), 5.8 (orange), 8.0 (red) microns
Image scale: 
22.6 x 18.7 arcmin
Observers: 
William T. Reach, Principal Investigator (SSC/California Institute of Technology) Erick Young (University of Arizona) Lori Allen (Smithsonian Astrophysical Observatory) Jeonghee Rho (SSC/California Institute of Technology) Sean Carey (SSC/California Institute of Technology) Luisa Rebull (SSC/California Institute of Technology) Susan Stolovy (SSC/California Institute of Technology) Alberto Noriega-Crespo (SSC/California Institute of Technology) Sergio Fajardo-Acosta (SSC/California Institute of Technology) Jocelyn Keene (SSC/California Institute of Technology) Thomas H. Jarrett (IPAC/California Institute of Technology) Patrick Lowrance (IPAC/California Institute of Technology) George H. Rieke (University of Arizona) Lee Hartmann (Smithsonian Astrophysical Observatory) Aurora Sicilia Aguilar (Smithsonian Astrophysical Observatory) Tony Marston (European Space Agency)
Instrument: 
IRAC
Exposure Date: 
November 5, 2003
Exposure Time: 
8 seconds per position
Orientation: 
North is rotated 5 degrees clockwise from the vertical
Related links: 
Full color 2-sided lithograph (PDF file) [ http://coolcosmos.ipac.caltech.edu/resources/paper_products/print_publication_pdf/ic1396.pdf ]
note: 
*Spitzer/IRAC composite image of a dark globule in IC 1396. Emission from 3.6 microns (blue), 4.5 microns (green), 5.6 microns (orange) and 8.0 microns (red) have been combined in a single image* Screen-Resolution (450x370): JPEG [ http://ipac.jpl.nasa.gov/media_images/ ssc2003-06a1_small.jpg ] High-Resolution (1142x939): JPEG | Mac TIFF | PC TIFF Credit: NASA/JPL-Caltech/W. Reach (SSC/Caltech)
facet_what: 
Cepheus
facet_where: 
Arizona
facet_when: 
November 5, 2003
facet_when_year: 
2003
Image #: 
ssc2003-06a
original url: 
http://sscws1.ipac.caltech.edu/Imagegallery/image.php?image_name=ssc2003-06a
UID: 
SPD-SPITZ-ssc2003-06a