Ingredients of a Comet

Spitzer_ssc2005-18c_1024

spitzer_ssc2005-18c September 7th, 2005

Credit: NASA/JPL-Caltech/R. Hurt (SSC)

Astronomers using data from NASA's Spitzer Space Telescope and the Deep Impact mission are putting together a recipe for comet "soup" -- the primordial stuff of planets, comets, and other bodies in our solar system.

The comet ingredients were excavated from comet Tempel 1 on July 4, 2005, when Deep Impact's probe plunged below its surface. While Deep Impact was busy collecting data up close, other telescopes around the world were also watching from the ground and space.

Though the findings are still being analyzed, astronomers are already getting a good taste of our early solar system's history.

Spitzer observed the dramatic event using its infrared spectrometer. This instrument breaks apart light like a prism, allowing astronomers to pick out chemical signatures that appear between the wavelengths of 5 and 38 microns. So far, Spitzer has detected clays; iron-containing compounds; carbonates, the minerals in seashells; crystallized silicates, such as the green olivine minerals found on beaches and in the gemstone peridot; and polycyclic aromatic hydrocarbons, carbon-containing compounds found in car exhaust and on burnt toast. Hints of the mineral found in the reddish-brown gem spinel were also observed.

Deep Impact's spectrometer has picked up the signatures of additional molecules within the wavelength range of 1 to 5 microns, including water vapor and carbon dioxide gas (the swirling vapor that comes off "dry ice").

These "comet soup" ingredients are pictured above: (on plates, from left to right) ice and dry ice; (in measuring cups, from left to right) olivine, smectite clay, polycyclic aromatic hydrocarbons, spinel, metallic iron; (on table in the front, from left to right) the silicate enstatite, the carbonate dolomite, and the iron sulfide marcasite.

Materials are courtesy of Dr. George Rossman of the California Institute of Technology's Geology and Planetary Sciences department.

Provider: Spitzer Space Telescope

Image Source: http://www.spitzer.caltech.edu/images/1471-ssc2005-18c-Ingredients-of-a-Comet

Curator: Spitzer Space Telescope, Pasadena, CA, USA

Image Use Policy: http://www.spitzer.caltech.edu/info/18-Image-Use-Policy

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Image Details

Image Type
Photograph
Subject - General
Interplanetary Body > Comet
Spitzer_ssc2005-18c_1280
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ID
ssc2005-18c
Subject Category
E.2.2.  
Subject Name
Credits
NASA/JPL-Caltech/R. Hurt (SSC)
Release Date
2005-09-07
Lightyears
Redshift
Reference Url
http://www.spitzer.caltech.edu/images/1471-ssc2005-18c-Ingredients-of-a-Comet
Type
Photograph
Image Quality
Good
Distance Notes
Facility
Instrument
Color Assignment
Band
Bandpass
Central Wavelength
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
Equinox
Reference Value
Reference Dimension
Reference Pixel
Scale
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Coordinate System Projection:
Quality
FITS Header
Notes
Creator (Curator)
Spitzer Space Telescope
URL
http://www.spitzer.caltech.edu
Name
Spitzer Space Telescope
Email
Telephone
Address
1200 E. California Blvd.
City
Pasadena
State/Province
CA
Postal Code
91125
Country
USA
Rights
http://www.spitzer.caltech.edu/info/18-Image-Use-Policy
Publisher
Spitzer Science Center
Publisher ID
spitzer
Resource ID
ssc2005-18c.tif
Metadata Date
2012-03-22
Metadata Version
1.1
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