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Infrared Radiometer

NSSDC ID: 1973-019A-08
Mission Name: Pioneer 11
Principal Investigator: Dr. Andrew P. Ingersoll


The Pioneer 11 infrared radiometer experiment measured the Jovian and Saturnian thermal balance, temperature distribution in the outer atmosphere, general surface composition (including the overall hydrogen-to-helium ratio), and dark-side temperature. The instrument consisted of a 7.62-cm reflecting Cassegrain telescope with a 1-deg by 3-deg field of view that illuminated a pair of 88-channel, thin-film bimetallic thermopiles in two bands of the IR spectrum (14 to 25 micrometers and 19 to 56 micrometers) to measure the irradiance. The two-channel radiometer was similar to those flown on Mariners 6 and 7, but was more accurate and had better spatial resolution. This instrument was turned off in October 1979.

Funding Agency

  • NASA-Office of Space Science (United States)


  • Astronomy: Infrared
  • Planetary Science: Atmospheres

Additional Information

Questions or comments about this experiment can be directed to: Dr. John F. Cooper.



NameRoleOriginal AffiliationE-mail
Dr. Gerry NeugebauerOther InvestigatorCalifornia Institute of
Dr. Robert W. BoeseOther InvestigatorNASA Ames Research Center 
Dr. Laurence M. TraftonOther InvestigatorUniversity of Texas,
Dr. Andrew P. IngersollPrincipal InvestigatorCalifornia Institute of
Mr. Stillman C. Chase, Jr.Other InvestigatorSanta Barbara Research Center 
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