a region with low galactic and extragalactic emission is observed near the ecliptic plane. all apertures that have been used by observers during routine observations with a given filter are measured, to obtain the effective area projected on the sky. the results will be compared with the known geometric areas of the field-apertures.
Instrument
PHT04
Temporal Coverage
1997-10-28T22:28:03Z/1997-10-29T05:05:35Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.