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Spitzer/IRAC composite image of a dark globule in IC 1396
Ssc2003 06a1

Credit: NASA/JPL-Caltech/W. Reach (SSC/Caltech)

Observation • December 18th, 2003 • ssc2003-06a1

ssc2003-06a1

This NASA Spitzer Space Telescope image reveals a glowing stellar nursery embedded within the Elephant's Trunk Nebula, 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 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 was obtained by Spitzer's infrared array camera and 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 visible-light images, 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.

About the Object

Name
Elephant's Trunk NebulaIC 1396Trumpler 37
Type
Nebula > Type > Star Formation
Nebula > Appearance > Emission
Distance
2,450 Light Years

Color Mapping

Band Wavelength Telescope
Infrared 3.6 µm Spitzer IRAC
Infrared 4.5 µm Spitzer IRAC
Infrared 5.8 µm Spitzer IRAC
Infrared 8.0 µm Spitzer IRAC

Astrometrics

Position (J2000)
RA =21h 36m 5.9s
Dec = 57° 27' 51.2"
Field of View
22.8 x 18.8 arcminutes
Orientation
North is 354.9° left of vertical