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1998 Titius
1998 Titius, provisional designation , is a transitional metallic–carbonaceous asteroid from the asteroid belt. It was discovered by German astronomer Alfred Bohrmann at Heidelberg Observatory on 24 February 1938.〔
The asteroid orbits the Sun at a distance of 2.3–2.6 AU once every 3 years and 9 months. Its spectral classification is Xc, a transitional spectral type between the two larger groups of metallic X-type and carbonaceous C-type asteroids, which are much darker than the most common stony S-type asteroids. It has a low orbital eccentricity of 0.06.
Based upon photometric measurements made at the Santana Observatory, this object has a rotation period of hours, during which it varies in magnitude by .〔 It has a 2:1 orbital resonance with the planet Mars.〔
It is named after German astronomer Johann Daniel Titius (1729–1796), best known for formulating the Titius-Bode law, which states that each subsequent planet in the Solar System is roughly twice as far from the Sun than the previous one. He is also honored by the lunar crater ''Titius''.〔
== 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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