(163693) Atira
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 .