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Observing strategy and detection limit with C_160 Previous test observations with the C_160 filter (SAO214134 and SAO248381, both 23 mJy, and Theta UMi, 46 mJy) have failed to detect the target stars, therefore new observations of a somewhat brighter target are necessary. We propose to observe HR6132 from the GBPP list with C_160, using all four different observing modes listed in the report 'Detection limits and observing strategy for very faint point sources' (SAI/96-188/Doc, Laureijs et al.). The star has a predicted brightness of 75 mJy at 175 um, and is located at a very low background environment. The results will help to answer the following questions: - which observing mode provides the best detection limit? - is the signal of the chopped measurement smaller than the signal derived from staring measurement? Is this effect observable in case of P32 oversampled maps as well? - does the 2x4 raster provide higher signal than the staring measurement? UK, RJL 12/09/96