Abstract: Study of the "multiplicity" of quasars caused by gravitational lens.

Full Text of Proposal

Comments by OPC

General Comments: Search for variability of lensed quasar images. Will need further images after a time interval.

Visibility:Only two of the three listed quasars are accessible now (RA 16h34 not possible). Northern hemisphere observing needed.

Special Comments: No filter was specified. Use of B is recommended, although filter I might be better as the full moon approaches. Several shorter exposures would be better than one 600s exposure. Also need standard star observations for the calibration of the photometry.

Expected time consumption (including overhead): 10 minutes for each image, plus standard stars; about 40 minutes in total.

Proposed facility: OHP, Crni Vrh (Slovenia), Brorfelde, or Bradford