258 Tyche

258 Tyche
Discovery A
Discoverer Robert Luther
Discovery date May 4, 1886
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)
Argument of
perihelion (ω)
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

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).


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