230 Athamantis

230 Athamantis
	A three-dimensional model of 230 Athamantis based on its light curve.
Discovery
Discovered by	K. de Ball
Discovery date	3 September 1882
Designations
MPC designation	(230) Athamantis
Pronunciation	/æθəˈmæntɪs/
Named after	Helle
Alternative designations	1949 WG
Minor planet category	Main belt
Orbital characteristics[1]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	133.58 yr (48791 d)
Aphelion	2.52818 AU (378.210 Gm)
Perihelion	2.23641 AU (334.562 Gm)
Semi-major axis	2.38229 AU (356.386 Gm)
Eccentricity	0.061238
Orbital period	3.68 yr (1343.0 d)
Average orbital speed	19.3 km/s
Mean anomaly	116.194°
Mean motion	0° 16m 4.969s / day
Inclination	9.44320°
Longitude of ascending node	239.900°
Argument of perihelion	139.121°
Physical characteristics
Dimensions	108.99±2.0 km[1]; 110.17 ± 4.57 km[2]
Mass	(1.89 ± 0.19) × 1018 kg[2]
Mean density	2.69 ± 0.43 g/cm3[2]
Rotation period	24.0055 h (1.00023 d)[1]; 23.99 h[3]
Geometric albedo	0.1708±0.006
Spectral type	S
Absolute magnitude (H)	7.35

Athamantis (minor planet designation: 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.[3] It has the spectrum of an S-type asteroid.

References

"230 Athamantis". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
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.
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 (3), pp. 512–517, Bibcode:1985Icar...62..512Z, doi:10.1016/0019-1035(85)90191-5.

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