Posts: 1745
From: Atlanta-area, GA USA
Registered: Aug 2000

posted 07-23-2015 03:49 PM               

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I have just listed on eBay a cover autographed by both Clyde Tombaugh, discoverer of Pluto, and James Christy, discoverer of Charon, the first moon of Pluto: 151755681707

The cover is canceled in Flagstaff, AZ, the location of the Lowell Observatory where Tombaugh discovered Pluto, and is canceled on February 18, 1980, the 50th anniversary of Pluto's discovery.

Tombaugh added his standard inscription about discovering Pluto and Christy added that he discovered Charon on June 22, 1978. Tombaugh signed the cover in the 1980's and Christy in 1983.