OBJECT     = SPACECRAFT  

SPACECRAFT_ID                  = IRAS

OBJECT     = SCINFO      

LAUNCH_DATE                    = 1983-01-26
INSTRUMENT_HOST_NAME           = "INFRARED ASTRONOMICAL SATELLITE"
INSTRUMENT_HOST_TYPE           = SPACECRAFT 
SPACECRAFT_DESC                ="The satellite consisted of two main parts, the
spacecraft and the telescope system. The overall dimensions of the satellite 
with deployed solar panels were: height 3.60 m, width 3.24 m, depth 2.05 m. 
Satellite mass at launch was 809 kg. The telescope system comprised the upper 
part of the satellite and was composed of a two mirror, Ritchey-Chretien `
telescope mounted within a toroidal superfluid helium tank, which in turn was 
mounted within the evacuated main shell. The optical system was protected from 
contamination before launch and during the first week of the mission by an 
aperture cover cooled with supercritical helium. After the cover was ejected, 
the sunshade limited heat flow to the aperture by blocking direct solar 
radiation and reflecting away terrestrial infrared radiation. The telescope was 
cooled by contact with the superfluid helium tank to temperatures ranging from 
2 to 5 K. The surfaces of the sunshade which could be viewed by the telescope 
aperture were cooled by a three-stage radiator to about 95 K.
\n
\n
The satellite attitude was controlled by three orthogonal reaction wheels;
excess momentum was dumped via magnetic coils to the Earth's magnetic field
as necessary. The attitude, and changes in attitude, were sensed by a
combination of a horizon sensor, a sun-sensor and three orthogonal gyros.
The z-axis gyro was used in all modes of control and was duplicated to
provide a redundant backup."

END_OBJECT = SCINFO                         

OBJECT     = PLATFORM 

PLATFORM_OR_MOUNTING_NAME      = "N/A"
PLATFORM_OR_MOUNTING_DESC      = "N/A"

END_OBJECT = PLATFORM                       


/* Template: Spacecraft Reference Information Template          Rev: 19890121 */

/* Note:       The following templates form part of a standard                */
/*             set for the submission of a publication reference              */
/*             to the PDS.                                                    */


END_OBJECT = SPACECRAFT                     

OBJECT     = SCREFINFO
  REFERENCE_KEY_ID                = "BEICHMANETAL1988"
END_OBJECT = SCREFINFO                      
OBJECT     = SCREFINFO
  REFERENCE_KEY_ID                = "NEUGEBAUERETAL1984"
END_OBJECT = SCREFINFO                      
END