258 Tyche
Light curve-based 3D-model of 258 Tyche
|
|
| Discovery [1] | |
|---|---|
| Discovered by | R. Luther |
| Discovery site | Düsseldorf-Bilk Obs. |
| Discovery date | 4 May 1886 |
| Designations | |
| MPC designation | 258 Tyche |
|
Named after
|
Tyche[2] |
| Eunomia · main-belt | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 129.37 yr (47,254 days) |
| Aphelion | 3.1496 AU |
| Perihelion | 2.0802 AU |
| 2.6149 AU | |
| Eccentricity | 0.2044 |
| 4.23 yr (1544.5 days) | |
|
Average orbital speed
|
18.42 km/s[citation needed] |
| 65.069° | |
| Inclination | 14.298° |
| 207.64° | |
| 154.69° | |
| Earth MOID | 1.0881 AU |
| Physical characteristics | |
| Dimensions | 65 km [3] |
| Mass | ~ 4×1017 (estimate) |
|
Mean density
|
~ 2.7 g/cm³[4] |
| 10.041 h[5] | |
| 0.168 [3] | |
| Temperature | ~ 169 K max: 268 K[citation needed] |
| B–V = 0.876 U–B = 0.459 S (Tholen), S (SMASS) |
|
| 8.50 | |
258 Tyche is a relatively large main belt asteroid discovered by Robert Luther at Düsseldorf-Bilk Observatory on 4 May 1886.[1] The stony S-type asteroid measures about 65 kilometers in diameter and has a perihelion of 2.1 AU.[1]
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.[6]
It was named after Greek goddess of fortune, Tyche, which is also the name of one of the Oceanids. Tyche's Roman equivalent is Fortuna, after which the asteroid 19 Fortuna is named.[2]
References
- ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 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
- ↑ D. Riccioli, C. Blanco, & M. Cigna Rotational periods of asteroids II, Planetary and Space Science, Vol. 49,, p. 657 (2001).
External links
- Lua error in package.lua at line 80: module 'strict' not found.
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- Ephemeris
