258 Tyche
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Discovery | |
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Discovered by: | Robert Luther |
Discovery date: | May 4, 1886 |
Orbital characteristics | |
Epoch 30 January, 2005 (JD 2453400.5) | |
Aphelion | 471.289 Gm (3.15 AU) |
Perihelion: | 311.048 Gm (2.079 AU) |
Semi-major axis: | 391.168 Gm (2.615 AU) |
Eccentricity: | 0.205 |
Orbital period: | 1544.356 d (4.23 a) |
Mean anomaly: | 258.968° |
Inclination: | 14.293° |
Longitude of ascending node: | 207.701° |
Argument of perihelion: | 154.948° |
Physical characteristics | |
Dimensions: | 65 km[1] |
Mass: | ~4×1017 (estimate) |
Mean density: | ~2.7 g/cm³ (estimate)[2] |
Escape velocity: | ~0.04 km/s (estimate) |
Rotation period: | 0.417 d (10.0 h)[3][4] |
Albedo: | 0.168[1] |
258 Tyche is a fairly big Main belt asteroid. It is classified as an S-type. Tyche orbits very close to the Eunomia family of asteroids, and could be a member based on what it is made of. However, it is bigger than all family members apart from 15 Eunomia while lying at the very edge of the family group. Hence, there is a good chance that it is an unrelated asteroid.
There is some uncertainty on Tyche's rotation period. Many authors give values from 9.983 to 10.041 hours.[4]
It was found by Robert Luther on May 4, 1886 in Düsseldorf and was named after Greek goddess Tyche. Tyche's Roman equivalent is Fortuna, who also has an asteroid named after her (19 Fortuna).
[change] References
- ↑ 1.0 1.1 Supplemental IRAS Minor Planet Survey
- ↑ G. A. Krasinsky et al Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).
- ↑ PDS lightcurve data
- ↑ 4.0 4.1 D. Riccioli, C. Blanco, & M. Cigna Rotational periods of asteroids II, Planetary and Space Science, Vol. 49,, p. 657 (2001).
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
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257 Silesia | 258 Tyche | 259 Aletheia
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Near-Earth asteroids · Main belt · Jupiter Trojans · Neptune Trojans · Comets · Kuiper belt · Oort cloud |