INFRARED ASTRONOMICAL SATELLITE

(IRAS)

From February 9, 1983 to November 22, 1983, the Infrared Astronomical Satellite conducted a survey of the sky at thermal infrared wavelengths from a 900 km polar orbit about the Earth. This survey consisted of 5749 scans (identified by SOP OBS), along lines of constant solar elongation, between 60 and 120 degrees solar elongation. 95% of the sky was covered twice and 72% was covered three times by IRAS. Apart from detailed observations of the zodiacal cloud, IRAS made over 8000 detections of asteroids.

Mission Spacecraft Instrument Dataset Descriptions ORDER DATA

Focal Plane Array Detector Information

IRAS used an array of 62 detectors located at the focal plane of the telescope. They were divided into 8 parallel modules, two for each color band (12, 25, 60 and 100 microns), and maintained at a temperature of 2.6K. 

FOCAL PLANE DETECTORS FILE                  DATA      
BAND 1 ( 12 MICRON) SPECTRAL RESPONSE FILE  DATA 
BAND 2 ( 25 MICRON) SPECTRAL RESPONSE FILE  DATA
BAND 3 ( 60 MICRON) SPECTRAL RESPONSE FILE  DATA
BAND 4 (100 MICRON) SPECTRAL RESPONSE FILE  DATA



















Satellite Position and Pointing Information





The Scan History File identifies each scan (SOP OBS) and gives its pointing
geometry and length. The Satellite Positions File gives the position of the
satellite and Earth in rectangular coordinates at 200 second intervals.

SCAN HISTORY FILE                 DATA   SEARCH 
SATELLITE POSITIONS FILE (21Mb)   DATA














Scans of the Sky - The IRAS Zodiacal History File





The Zodiacal History File consists of 5749 data files of individual scans.
Each scan was roughly constant in ecliptic longitude.
Thermal sky brightness information has been binned into Low Resolution (1/2 degree cross-scan,
1/2 degree in-scan) and Medium Resolution (1/2 degree cross-scan, 2 arcminute
in-scan) products.





LOW RES ZODIACAL HISTORY FILE (ASCII)

DATA: SOP 029-600
 
Examine or extract the data or PDS label associated with 
an individual scan at 0.5 degree resolution in-scan:


      SOP:  OBS:        
 

MEDIUM RES ZODIACAL HISTORY FILE (ASCII) 

DATA: SOP 029-179  180-399  400-600

Examine or extract the data or PDS label associated with 
an individual scan at 2 arcminute resolution in-scan:


      SOP:  OBS:        



The Low and Medium Resolution Zodiacal History Files are also available by
request from
the PDS Small Bodies Node as single (large) binary files. They are characterized
by their associated index files:

LOW RES ZOD HIST FILE (Binary)    INDEX DESCRIPTION   INDEX
MED RES ZOD HIST FILE (Binary)    INDEX DESCRIPTION   INDEX











IRAS Minor Planet Survey (IMPS)






DIAMETER AND ALBEDO FILE        DATA       
SIGHTINGS FILE (5Mb)            DATA    
GROUNDBASED DATA CATALOG (2Mb)  DATA     
STATISTICS CATALOG              DATA  
SINGLETON CATALOG               DATA     
REJECT CATALOG                  DATA    
MISSED DETECTIONS               DATA  
STANDARD THERMAL MODEL          DATA


















Other IRAS Information/Data - IPAC

IRAS Data Services - IPAC