(1999) Hirayama
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Asteroid (1999) Hirayama |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Major semi-axis | 3.116 AU |
| eccentricity | 0.114 |
| Perihelion - aphelion | 2.761 AU - 3.472 AU |
| Inclination of the orbit plane | 12.532 ° |
| Length of the ascending node | 148.046 ° |
| Argument of the periapsis | 356.573 ° |
| Time of passage of the perihelion | July 26, 2011 |
| Sidereal period | 5.51 a |
| Physical Properties | |
| Medium diameter | approx. 34 km |
| Albedo | 0.09 |
| Rotation period | (15.63 ± 0.01) h |
| Absolute brightness | 10.9 likes |
| history | |
| Explorer | Luboš Kohoutek |
| Date of discovery | February 27, 1973 |
| Another name | 1973 DR; 1935 GF; 1940 EH; 1951 EY 1 ; 1951 FA; 1965 UF; 1969 NB; 1975 NE |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(1999) Hirayama ( 1973 DR ) is an asteroid of the main belt that was discovered on February 27, 1973 by the Czech astronomer Luboš Kohoutek in the Hamburg observatory ( Bergedorf ).
The asteroid was named after the Japanese astronomer Kiyotsugu Hirayama (1874–1943).