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1604 Tombaugh
1604 Tombaugh, provisional designation 1931 FH, is an asteroid from the outer region of the asteroid belt, about 32 kilometers in diameter. It was discovered by American astronomer Carl Lampland at Lowell Observatory in Flagstaff, Arizona, on March 24, 1931.〔
The X-type asteroid is a member of the Eos family and classified as a XSCU and Xc subtype in the Tholen and SMASS taxonomy, respectively. It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,920 days). Its orbit shows an eccentricity of 0.10 and is tilted by 9 degrees to the plane of the ecliptic. Its rotation has been measured several times with resulting periods between 6 and 8 hours.〔〔〔〔〔 Observations by the Infrared Astronomical Satellite, IRAS, and by the Japanese satellite Akari, measured an albedo of 0.10 and 0.14, respectively.〔〔
The asteroid was named after American astronomer Clyde Tombaugh (1906–1997), famous for his discovery of Pluto in 1930. The Lowell Observatory named the body on the occasion of a symposium on Pluto, held in 1980. When Tombaugh examined the photographic plates during the trans-Saturnian search program at the Lowell Observatory, he also marked over 4,000 minor planets on these plates.〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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