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IR Telescope

NSSDC ID: 1983-004A-01
Mission Name: IRAS


The IRAS telescope system consisted of the optical subsystem (OSS), and the electronic, cryogenic, structural, and thermal subsystem. The OSS consisted of a two-mirror Ritchey-Chretien folded-optics reflector telescope with an aperture of 57 cm and a focal length of 5.5 cm. The FOV was slightly more than 1 deg and was diffraction limited at all wavelengths beyond 8 micrometers. The aperture was 41% obscured by the secondary mirror, with a total effective area of 2024 sq cm. The focal plane assembly was a subassembly of 62 IR and 8 visible detectors mounted at the focal plane of the OSS. The total array consisted of eight IR color band modules and two visible band modules.


  • Astronomy: Infrared

Additional Information

Questions or comments about this experiment can be directed to: Coordinated Request and User Support Office.



NameRoleOriginal AffiliationE-mail
Principal InvestigatorNASA Jet Propulsion Laboratory 
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