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Last modified: 20 July 2010

What is the focal plane temperature for my observation?

The FP_TEMP keyword contains the temperature at the focal plane during the observation. The units are kelvin, so the temperature in °C is approximately FP_TEMP - 273. The keyword can be found in the level 1 event file (i.e. evt1). It is now also included in the level 2 event file (i.e. evt2) if the observation was processed with either software version DS 7.3.0 (released June 2004) or if CIAO was used to create a new level 2 event file.

unix% dmkeypar acisf01838_000N002_evt1.fits fp_temp echo+

The temperature of this observation is therefore approximately -120°C.

Last modified: 20 July 2010