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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
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)	3.68 yr (1343.0 d)
Average orbital speed	19.3 km/s
Mean anomaly	116.2°
Mean motion	0° 16 4.969 / day
Inclination	9.443°
Longitude of ascending node	239.9°
Argument of perihelion	139.1°
Physical characteristics
Mean diameter	118±2 km 111.332±1.231 km 110.17 ± 4.57 km
Flattening	0.24
Mass	(2.3±1.1)×10 kg (1.89±0.19)×10 kg
Mean density	2.7±1.3 g/cm 2.69±0.43 g/cm
Synodic rotation period	24.0055 h (1.00023 d) 23.99 h
Geometric albedo	0.146 (calculated) 0.164±0.029
Spectral type	S
Absolute magnitude (H)	7.53

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. It has the spectrum of an S-type asteroid. During 1991, the asteroid was observed occulting a star. The resulting chords provided a cross-section diameter estimate of 101.8 km.

Notes

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

References

1. ^ "230 Athamantis". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
2. ^ P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
3. ^ Carry, 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.
4. ^ 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, vol. 62, no. 3, pp. 512–517, Bibcode:1985Icar...62..512Z, doi:10.1016/0019-1035(85)90191-5.
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

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

This article about an S-type asteroid native to the asteroid belt is a stub. You can help Misplaced Pages by expanding it.

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• Minor planet object articles (numbered)
• Background asteroids
• Discoveries by Leo de Ball
• Named minor planets
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• Astronomical objects discovered in 1882
• Objects observed by stellar occultation
• S-type main-belt-asteroid stubs