Astronomy:258 Tyche
.png) 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 | |
| (258) Tyche | |
| Pronunciation | /ˈtaɪkiː/[3] |
| Named after | Tyche [2] |
| A886 JA | |
| Minor planet category | Eunomia · main-belt |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 129.95 yr (47465 d) |
| |{{{apsis}}}|helion}} | 3.1512 astronomical unit|AU (471.41 Gm) |
| |{{{apsis}}}|helion}} | 2.0838 AU (311.73 Gm) |
| 2.6175 AU (391.57 Gm) | |
| Eccentricity | 0.20390 |
| Orbital period | 4.23 yr (1546.8 d) |
| Average Orbital speed | 18.42 km/s[citation needed] |
| Mean anomaly | 157.95° |
| Mean motion | 0° 13m 57.864s / day |
| Inclination | 14.305° |
| Longitude of ascending node | 207.59° |
| 155.01° | |
| Earth MOID | 1.09016 AU (163.086 Gm) |
| Jupiter MOID | 2.34517 AU (350.832 Gm) |
| TJupiter | 3.334 |
| Physical characteristics | |
| Dimensions | 64.78±1.2 km [1] 65 km [4] |
| Mass | ~ 4×1017 kg (estimate) |
| Mean density | ~ 2.7 g/cm3[5] |
| Rotation period | 10.041 h (0.4184 d) [1][6] |
| Geometric albedo | 0.1676±0.006 [1] 0.168 [4] |
| Physics | ~ 169 K max: 268 K[citation needed] |
| B–V = 0.876 U–B = 0.459 S (Tholen), S (SMASS) | |
| Absolute magnitude (H) | 8.50 |
Tyche (minor planet designation: 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.[7]
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 1.4 1.5 1.6 "JPL Small-Body Database Browser: 258 Tyche". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000258. Retrieved 11 May 2016.
- ↑ 2.0 2.1 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (258) Tyche. Springer Berlin Heidelberg. p. 38. doi:10.1007/978-3-540-29925-7_259. ISBN 978-3-540-29925-7.
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ 4.0 4.1 Supplemental IRAS Minor Planet Survey
- ↑ Krasinsky, G.; Pitjeva, E. V.; Vasilyev, M. V.; Yagudina, E. I. (2002). "Hidden Mass in the Asteroid Belt". Icarus 158 (1): 98–105. doi:10.1006/icar.2002.6837. Bibcode: 2002Icar..158...98K.
- ↑ PDS lightcurve data
- ↑ Riccioli, D.; Blanco, C.; Cigna, M. (2001). "Rotational periods of asteroids II". Planetary and Space Science 49 (7): 657. doi:10.1016/S0032-0633(01)00014-9. Bibcode: 2001P&SS...49..657R.
External links
- "258 Tyche". JPL Small-Body Database. Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000258.
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- Ephemeris
- 258 Tyche at AstDyS-2, Asteroids—Dynamic Site
- 258 Tyche at the JPL Small-Body Database
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