The accurate knowledge of the straylight is a prerequisite for an 
accurate photometric calibration of the ISOPHOT-P subexperiment.
The aim of the proposed observation with PHT-P2 is the determination 
of the straylight contribution from sources outside the field-of-view.
This measurement is the last in a series of three similar exploratory
measurements carried out on PHT-S and C200, which will be the base
to review eventual more sensitive measurements on the sun and earth.

.HISTORY
20/01/97	UK, RL, First Version based on proposal by D. Lemke et al.
			(email 18/12/96)



.OTT 15371
.TDT 16756