6695 Barrettduff (1986 PD1) is a main-belt asteroid discovered on August 1 1986 by E. F. Helin at Palomar.6695 Barrettduff (1986 PD1) is a Main-belt Asteroid discovered on August 1 1986 by E. F. Helin at Palomar. It was named for Barrett Duff by Dr.
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