(4197) 1982 TA

(4197) 1982 TA
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "(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
Alternate name^[1]	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 G m (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) ^[2]
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

^ Minor Planet Designations
^ 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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