ISOPHOT - ISO'S Photometer
This picture shows the ISOPHOT instrument. A photometer is an instrument to measure the amount of light we receive from an object in a selected range of infrared colour.
It is specially designed to measure the amount of infrared light very aaccurately and is very sensitive to low light levels, so it can be used to measure very faint objects.
ISOPHOT is used for a large proportion of ISO's work. It's measurements may be simple, such as how much infrared do we get from a certain object, but this is often what we need. It can measure some of the dimmest, coolest astronomical objects.
Here ISOPHOT has been used to measure a dense, very cold cloud from which a star is beginning to form. At -260C it is so cold that only ISO's longest wavelength detector can measure it. To make this picture, lots of overlapping measurements are taken and are combined.
Last updated: 10 October 2001
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