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Clyde W. Tombaugh

Currency:USD Category:Collectibles / Autographs Start Price:NA Estimated At:100.00 - 200.00 USD
Clyde W. Tombaugh

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Auction Date:2010 Jun 16 @ 10:00 (UTC-05:00 : EST/CDT)
Location:5 Rt 101A Suite 5, Amherst, New Hampshire, 03031, United States
ALS - Autograph Letter Signed
ANS - Autograph Note Signed
AQS - Autograph Quotation Signed
AMQS - Autograph Musical Quotation Signed
DS - Document Signed
FDC - First Day Cover
Inscribed - “Personalized”
ISP - Inscribed Signed Photograph
LS - Letter Signed
SP - Signed Photograph
TLS - Typed Letter Signed
Bid online at www.rrauction.com. Auction closes June 16.

ALS, one page, 8.5 x 11, September 21, 1979. Letter to a space enthusiast mentioning his upcoming book and his discovery of Pluto. In part: “From my extensive planet search over 70% of the entire sky down to the 17th magnitude, this would indicate that other possible planets would have to be small and very distant to have escaped any thorough Blink-Microscope-Comparator…There are several hypotheses on the origin of Pluto and its satellite Charon—plausable but debatable. With the discovery of Pluto’s satellite. A reliable value for the mass of Pluto became available, with the astonishing flow mass 1/5th that of our moon. Charon’s mass is 1/10th of that. Density near 1.00 equal to that of ice!” In fine condition.