The Infrared Telescope in Space (IRTS)

The IRTS is the first Japanese orbiting mission for infrared astronomy. The IRTS was equipped with a 15-cm cooled telescope and four scientific instruments :

the Near-InfraRed Spectrometer (NIRS; 1.4-4.0 µm)
the Mid-InfraRed Spectrometer (MIRS; 4.5-11.7 µm)
the Far-Infrared Line Mapper (FILM; 145, 155, 158, 160 µm)
the Far-InfraRed Photometer (FIRP; 150, 250, 400, 700 µm)

The angular resolution of the FIRP images is 0.5 deg and units are W/m2/sr/Hz.

Healpix maps made by D. Paradis.

References

'The Far-Infrared Photometer on the Infrared Telescope in Space' by Lange, A. E. et al, 1994, ApJ, 428, 384 http://adsabs.harvard.edu/abs/1994ApJ...428..384L
'Flight performance of the Far-Infrared Photometer (FIRP)' by Hirao, T. et al, 1996, SPIE, 2817, 276 http://adsabs.harvard.edu/abs/1996SPIE.2817..276H