(4197) 1982 TA
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| Discovery[1] and Designation | |
|---|---|
| Discovered by: | E. F. Helin and E. M. Shoemaker |
| Discovery date: | October 11, 1982 |
| Alternative names: [2] | none |
| Minor planet category: | Apollo, Mars-crosser, Venus-crosser |
| Orbital characteristics[3] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion distance: | 609.578 Gm (4.075 AU) |
| Perihelion distance: | 78.708 Gm (0.526 AU) |
| Semi-major axis: | 344.143 Gm (2.300 AU) |
| Eccentricity: | 0.771 |
| Orbital period: | 1274.441 d (3.49 a) |
| Avg. orbital speed: | 16.27 km/s |
| Mean anomaly: | 317.807° |
| Inclination: | 12.219° |
| Longitude of ascending node: | 10.001° |
| Argument of perihelion: | 119.441° |
| Physical characteristics | |
| Dimensions: | 1.7 km |
| Mass: | ~5.1×1012 kg |
| Mean density: | 2.0? g/cm³ |
| Equatorial surface gravity: | ~0.0005 m/s² |
| Equatorial Escape velocity: | ~0.0009 km/s |
| Sidereal rotation period: | 0.147418±0.000002 d (3.53802±0.00005 h) [1] |
| Axial tilt: | ?° |
| Pole ecliptic latitude: | ? |
| Pole ecliptic longitude: | ? |
| Geometric albedo: | 0.10? |
| Temperature: | ~183 K |
| Spectral type: | ? |
| Absolute magnitude: | 14.6 |
(4197) 1982 TA was discovered on October 11, 1982 by Eleanor F. Helin and Eugene Shoemaker. It is an Apollo, Mars- and Venus-crosser asteroid, only 1.7 km in diameter.
In 1996, astronomers at the Goldstone Observatory analysed it using radar delay-Doppler imaging. The resultant images are not very clear, but they show that (4197) 1982 TA has a roughly triangular shape, and a 3-hour rotation period.
[edit] References
- ^ P. Pravec, L. Šarounová, M. Wolf, I. R. V. Ferrin, J. Zhu : CCD photometry of asteroids (4197) 1982 TA and 1997 LY4, Planetary and Space Science , Vol. 48, No. 1, pp. 59-65 (2000) http://abob.libs.uga.edu/bobk/ccc/cc032100.html
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|---|---|---|
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