(4197) 1982 TA

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(4197) 1982 TA
Discovery[1] and designation
Discovered by E. F. Helin and E. M. Shoemaker
Discovery date October 11, 1982
Designations
Alternative names none
Minor planet category Apollo, Mars-crosser, Venus-crosser
Orbital characteristics[2]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 609.578 Gm (4.075 AU)
Perihelion 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)
Average 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 (H) 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.

References[edit]

  1. ^ 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