163693 Atira
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Discovery
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| Discovered by | M. Blythe, F. Shelly, M. Bezpalko, R. Huber, L. Manguso, S. Adams, D. Torres, T. Brothers, S. Partridge / LINEAR |
| Discovery date | February 11, 2003 |
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Designations
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| Alternative names | none |
| Minor planet category |
Aten, Apohele Venus-crosser |
| Epoch October 22, 2004 (JD 2453300.5) | |
| Aphelion | 146.580 Gm (0.980 AU) |
| Perihelion | 75.149 Gm (0.502 AU) |
| Semi-major axis | 110.865 Gm (0.741 AU) |
| Eccentricity | 0.322 |
| Orbital period | 233.023 d (0.64 a) |
| Average orbital speed | 33.68 km/s |
| Mean anomaly | 20.298° |
| Inclination | 25.618° |
| Longitude of ascending node | 103.952° |
| Argument of perihelion | 252.914° |
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Physical characteristics
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| Dimensions | ~2.0 km |
| Mass | 1.0×1012 kg |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | 0.0003 m/s² |
| Escape velocity | 0.0005 km/s |
| Rotation period | ? d |
| Albedo | 0.10 |
| Temperature | ~323 K |
| Spectral type | ? |
| Absolute magnitude | 16.43 |
Discovered February 11, 2003, by the Lincoln Near-Earth Asteroid Research project's station at Socorro, New Mexico, (163693) Atira (previously named 2003 CP20), was the first asteroid known to have an orbit entirely within that of Earth. Together with 2004 JG6, which has an even smaller orbit, it forms a subclass of Aten asteroids, known as Apoheles. Atira takes slightly over 233 days to orbit the Sun. It is a Venus-crosser asteroid, but does not get as close to the Sun as Mercury. With a diameter of about 2 km, it is the larger of the two known Apoheles and is one of the larger Aten asteroids.
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