(163693) Atira
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Asteroid (163693) Atira |
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| Properties of the orbit ( animation ) | |
| Orbit type | Aten type |
| Major semi-axis | 0.741 AU |
| eccentricity | 0.322 |
| Perihelion - aphelion | 0.502 AU - 0.980 AU |
| Inclination of the orbit plane | 25.618 ° |
| Sidereal period | 233,023 d |
| Mean orbital velocity | 33.68 km / s |
| Physical Properties | |
| Medium diameter | ~ 2.0 km |
| Dimensions | 1.0 x 10 12 kg |
| Albedo | 0.10 |
| Medium density | 2.0? g / cm³ |
| Rotation period | 2,974 h |
| Absolute brightness | 16.43 mag |
| Spectral class | ? |
| history | |
| Explorer | LINEAR |
| Date of discovery | February 11, 2003 |
| Another name | 2003 CP 20 |
| 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. | |
(163693) Atira is the first discovered asteroid , the orbit of which lies entirely within the earth's orbit . Together with (434326) 2004 JG 6 , which has an even narrower orbit , and eleven other asteroids, it forms a subgroup of the Aten asteroids called Apohele asteroids .
This is the first asteroid from the Apohele group to have an official name. According to the Pawnee mythology, Atira is the goddess of the earth and the evening star .