Dusty Celestial Ornaments Dusty Celestial Ornaments: Supernova Remnant Cassiopeia A
Ssc2007 20a1

Credit: NASA/JPL-Caltech/J. Rho (Caltech-SSC)

Observation • December 20th, 2007 • ssc2007-20a1


This infrared image shows silicon gas (blue) deep in the interior of the supernova remnant Cassiopeia A. This cooler gas, called the unshocked ejecta, was synthesized in the supernova blast.

The data for this image was taken by Spitzer's infrared spectrograph, which splits light apart to reveal the fingerprints of molecules and elements. In total, Spitzer collected separate "spectra" at more than 1,700 positions across Cassiopeia A.

About the Object

Cassiopeia ACas A
Nebula > Type > Supernova Remnant
11,000 Light Years

Color Mapping

Band Wavelength Telescope
Infrared 35.0 ┬Ám Spitzer IRS


Position (J2000)
RA =23h 23m 25.7s
Dec = 58° 49' 12.9"
Field of View
8.0 x 8.0 arcminutes
North is 0.2° left of vertical