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Palomar Four-Filter Survey

(Hale telescope survey aimed at discovering high-redshift quasars)

I use the term Palomar Four-Filter Survey for an Astronomical Survey of about 1990 carried out with the Four-Shooter Spectrograph/camera on the Hale Telescope, aimed at discovering high-Redshift Quasars. Photographs were taken with four custom Filters designed to catch redshifted H-alpha Emission Lines with a P Cygni Profile (an odd shape, characteristic of the star P Cygni, but expected to be visible in some quasars) and the designator "PC" might be taken from this.

PCPC 1247+3406Palomar Four-Filter Survey