Matches in DBpedia 2015-10 for { ?s ?p "1999 Hirayama is an asteroid discovered by Luboš Kohoutek at Bergedorf in 1973. It is named after Kiyotsugu Hirayama, the Japanese astronomer best known for his discovery that many asteroid orbits were more similar to one another than chance would allow, leading to the concept of asteroid families, now called Hirayama families.The light curve of 1999 Hirayama shows a periodicity of 15.63 ± 0.01 hours, during which time the brightness of the object varies by 0.45 ± 0.04 in magnitude. The spectrum of this object matches a C-type Tholen classification, but with a "broad absorption band that can be associated to a process of aqueous alteration". That is, the surface appears to show some form of water modification."@en }
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- 1999_Hirayama abstract "1999 Hirayama is an asteroid discovered by Luboš Kohoutek at Bergedorf in 1973. It is named after Kiyotsugu Hirayama, the Japanese astronomer best known for his discovery that many asteroid orbits were more similar to one another than chance would allow, leading to the concept of asteroid families, now called Hirayama families.The light curve of 1999 Hirayama shows a periodicity of 15.63 ± 0.01 hours, during which time the brightness of the object varies by 0.45 ± 0.04 in magnitude. The spectrum of this object matches a C-type Tholen classification, but with a "broad absorption band that can be associated to a process of aqueous alteration". That is, the surface appears to show some form of water modification.".