258 Tyche
| Discovery A |
| Discoverer |
Robert Luther |
| Discovery date |
May 4, 1886 |
Alternate
designations |
n/a B |
| Category |
Main belt (Eunomia) |
| Orbital elements C D |
|
Epoch 30 January 2005 (JD 2453400.5)
|
| Eccentricity (e) |
0.205 |
| Semi-major axis (a) |
391.168 Gm (2.615 AU) |
| Perihelion (q) |
311.048 Gm (2.079 AU) |
| Aphelion (Q) |
471.289 Gm (3.15 AU) |
| Orbital period (P) |
1544.356 d (4.23 a) |
| Mean orbital speed |
18.42 km/s |
| Inclination (i) |
14.293° |
Longitude of the
ascending node (Ω) |
207.701° |
Argument of
perihelion (ω) |
154.948° |
| Mean anomaly (M) |
258.968° |
| Physical characteristics |
| Dimensions |
65.0 km |
| Mass |
unknown |
| Density |
unknown |
| Surface gravity |
unknown |
| Escape velocity |
unknown |
| Rotation period |
10.041 h |
| Spectral class |
S |
| Absolute magnitude |
8.5 |
| Albedo |
0.168 |
Mean surface
temperature |
unknown |
258 Tyche is a relatively large Main belt asteroid. It is classified as a S-type asteroid and is probably composed of a mixture of silicates and metals.
It was discovered 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).
References
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