230 Athamantis
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| 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) × 1018[1] kg |
| Mean density | 2.69 ± 0.43[1] g/cm3 |
| Rotation period | 23.99[2] h |
| Albedo | 0.181 |
| Spectral type | S |
| Absolute magnitude (H) | 7.35 |
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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
- ↑ 1.0 1.1 1.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98-118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ 2.0 2.1 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: 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
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