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230 Athamantis

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Main-belt asteroid

230 Athamantis
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	0.06124
Orbital period (sidereal)	3.68yr (1343.0d)
Averageorbital speed	19.3 km/s
Mean anomaly	116.2°
Mean motion	0° 16^m 4.969^s / day
Inclination	9.443°
Longitude of ascending node	239.9°
Argument of perihelion	139.1°
Physical characteristics
Mean diameter	118±2 km^[2] 111.332±1.231 km^[1] 110.17 ± 4.57 km^[3]
Flattening	0.24^[a]
Mass	(2.3±1.1)×10¹⁸ kg^[2] (1.89±0.19)×10¹⁸ kg^[3]
Meandensity	2.7±1.3 g/cm³^[2] 2.69±0.43 g/cm³^[3]
Synodic rotation period	24.0055 h (1.00023 d)^[1] 23.99 h^[4]
Geometric albedo	0.146 (calculated)^[2] 0.164±0.029^[1]
Spectral type	S
Absolute magnitude (H)	7.53^[1]

230 Athamantis is a fairly largemain-belt asteroid that was discovered by the German-Austrian astronomerK. de Ball on September 3, 1882, inBothkamp. It was his only asteroid discovery. The asteroid was named afterAthamantis, daughter ofAthamas themythical Greek king ofOrchomenus.

Photometric observations of this asteroid gave alight curve with a period of 23.99 hours and a brightness variation of more than 0.20 inmagnitude.^[4] It has the spectrum of anS-type asteroid. During 1991, the asteroid was observedocculting a star. The resultingchords provided a cross-section diameter estimate of 101.8 km.^[5]

A three-dimensional model of 230 Athamantis based on its light curve

Notes

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^Flattening derived from the maximum aspect ratio (c/a): $f=1-{\frac {c}{a}}$ , where (c/a) =0.76±0.07.^[2]

References

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^^a ^b ^c ^d ^e"230 Athamantis".JPL Small-Body Database.NASA/Jet Propulsion Laboratory. Retrieved12 May 2016.
^^a ^b ^c ^d ^eP. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis.Astronomy & Astrophysics 54, A56
^^a ^b ^cCarry, B. (December 2012), "Density of asteroids",Planetary and Space Science, vol. 73, pp. 98–118,arXiv:1203.4336,Bibcode:2012P&SS...73...98C,doi:10.1016/j.pss.2012.03.009. See Table 1.
^^a ^bZeigler, 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, vol. 62, no. 3, pp. 512–517,Bibcode:1985Icar...62..512Z,doi:10.1016/0019-1035(85)90191-5.
^Shevchenko, Vasilij G.; Tedesco, Edward F. (September 2006), "Asteroid albedos deduced from stellar occultations",Icarus,184 (1):211–220,Bibcode:2006Icar..184..211S,doi:10.1016/j.icarus.2006.04.006.

External links

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The Asteroid Orbital Elements Database
Minor Planet Discovery Circumstances
Asteroid Lightcurve Data File
230 Athamantis atAstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
230 Athamantis at theJPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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