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1693 Hertzsprung
1693 Hertzsprung, provisional designation 1935 LA, is a dark and eccentric asteroid from the outer region of the asteroid belt, about 39 kilometers in diameter. It was discovered by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa on 5 May 1935.〔
The carbonaceous C-type asteroid is classified as a rare CBU-type subtype on the Tholen classification scheme. It orbits the Sun at a distance of 2.0–3.6 AU once every 4 years and 8 months (1,708 days). Its orbit shows an eccentricity of 0.27 and is tilted by 12 degrees to the plane of the ecliptic.〔 It has a rotation period of 8.8 hours〔 and an albedo of 0.03–0.06, according to observations made by the IRAS, Akari, WISE and NEOWISE missions.〔〔〔〔
The asteroid is named in honor of Danish chemist and astronomer Ejnar Hertzsprung (1873–1967), who was the director of the Leiden Observatory from 1934 to 1945. A well-known authority in the field of astronomical photometry, he initiated the ''Leiden Variable Star Survey'' of the southern Milky Way, during which survey many asteroids and some comets were found. 〔 Hertzsprung is best-known for the spectral classification system for stars he developed jointly with Russel, the famous Hertzsprung–Russell diagram.
== References ==
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