230 Athamantis

230 Athamantis

A three-dimensional model of 230 Athamantis based on its light curve.
Discovery
Discovered by	K. de Ball
Discovery date	September 3, 1882
Designations
Named after	Helle
Alternative names	1949 WG
Minor planet category	Main belt
Orbital characteristics
Epoch 30 January 2005 (JD 2453400.5)
Aphelion	378.299 Gm (2.529 AU)
Perihelion	334.395 Gm (2.235 AU)
Semi-major axis	356.347 Gm (2.382 AU)
Eccentricity	0.062
Orbital period	1342.801 d (3.68 a)
Average orbital speed	19.3 km/s
Mean anomaly	70.608°
Inclination	9.435°
Longitude of ascending node	239.979°
Argument of perihelion	138.926°
Physical characteristics
Dimensions	110.17 ± 4.57[1] km
Mass	(1.89 ± 0.19) × 10^18 kg[1]
Mean density	2.69 ± 0.43[1] g/cm^3
Rotation period	23.99[2] h
Albedo	0.181
Spectral type	S
Absolute magnitude (H)	7.35

230 Athamantis is a fairly large main-belt asteroid that was discovered by the German-Austrian astronomer K. de Ball on September 3, 1882, in Bothkamp. It was his only asteroid discovery. The asteroid was named after Athamantis, daughter of Athamas the mythical Greek king of Orchomenus.

Photometric observations of this asteroid gave a light curve with a period of 23.99 hours and a brightness variation of more than 0.20 in magnitude.^[2] It has the spectrum of an S-type asteroid.

References

1. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
2. Zeigler, K. W.; Florence, W. B. (June 1985), "Photoelectric photometry of asteroids 9 Metis, 18 Melpomene, 60 Echo, 116 Sirona, 230 Athamantis, 694 Ekard, and 1984 KD", Icarus 62, pp. 512–517, Bibcode:1985Icar...62..512Z, doi:10.1016/0019-1035(85)90191-5.

External links

• The Asteroid Orbital Elements Database
• Minor Planet Discovery Circumstances
• Asteroid Lightcurve Data File
• 230 Athamantis at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters