A three-dimensional model of 258 Tyche based on its light curve.
|Discovered by||Robert Luther|
|Discovery date||May 4, 1886|
|Minor planet category||Main belt (Eunomia family)|
|Epoch 30 January 2005 (JD 2453400.5)|
|Aphelion||471.289 Gm (3.15 AU)|
|Perihelion||311.048 Gm (2.079 AU)|
|391.168 Gm (2.615 AU)|
|1544.356 d (4.23 a)|
Average orbital speed
|Dimensions||65 km |
|~2.7 g/cm³ (estimate) |
|~0.025 m/s² (estimate)|
|~0.04 km/s (estimate)|
|0.417 d (10.0 h) |
max: 268 K (-5°C)
258 Tyche is a relatively large main belt asteroid discovered in 1886. It is classified as an S-type. Tyche orbits very close to the Eunomia family of asteroids, and could be a member based on composition. However, it is larger 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 interloper.
There is some uncertainty regarding Tyche's rotation period. Various authors give values from 9.983 to 10.041 hours.
- "JPL Small-Body Database Browser: 258 Tyche" (2011-04-01 last obs). Retrieved 2011-08-11.
- 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
- 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