 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | 27 September 1873 |
| Designations | |
| MPC designation | (134) Sophrosyne |
| Pronunciation | /soʊˈfrɒsɪniː/ |
| Named after | sophrosyne |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 138.60 yr (50625 d) |
| Aphelion | 2.86280 AU (428.269 Gm) |
| Perihelion | 2.26311 AU (338.556 Gm) |
| Semi-major axis | 2.56295 AU (383.412 Gm) |
| Eccentricity | 0.11699 |
| Orbital period (sidereal) | 4.10 yr (1498.7 d) |
| Average orbital speed | 18.54 km/s |
| Mean anomaly | 229.885° |
| Mean motion | 0° 14 24.76 / day |
| Inclination | 11.6018° |
| Longitude of ascending node | 345.986° |
| Argument of perihelion | 84.7156° |
| Earth MOID | 1.31034 AU (196.024 Gm) |
| Jupiter MOID | 2.42537 AU (362.830 Gm) |
| TJupiter | 3.396 |
| Physical characteristics | |
| Mean diameter | 108 112.188 km |
| Mass | (1.267 ± 0.575/0.398)×10 kg |
| Mean density | 1.713 ± 0.778/0.538 g/cm |
| Equatorial surface gravity | 0.029 m/s |
| Equatorial escape velocity | 0.056 km/s |
| Synodic rotation period | 17.190 h (0.7163 d) |
| Geometric albedo | 0.0364±0.001 0.0436 ± 0.0122 |
| Temperature | ~174 K |
| Spectral type | C (Tholen) |
| Absolute magnitude (H) | 9.04, 8.770 |
134 Sophrosyne is a large main-belt asteroid that was discovered by German astronomer Robert Luther on 27 September 1873, and was named after the concept of sophrosyne, Plato's term for 'moderation'. Classified as a C-type asteroid, it has an exceedingly dark surface and most probably a primitive carbonaceous composition.
An occultation of a star by 134 Sophrosyne was observed 24 November 1980, in the United States. Timing information from this event allowed a diameter estimate of 110 km to be derived. Photometric observations of the asteroid in 2015 produced a lightcurve indicating a rotation period of 17.190±0.001 h with a variation amplitude of 0.28±0.01 in magnitude. This provided a good match to the only previous determination in 1989.
References
- Noah Webster (1884) A Practical Dictionary of the English Language
- ^ Yeomans, Donald K., "134 Sophrosyne", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- ^ Pravec, P.; et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan, no. 1667, Bibcode:2012LPICo1667.6089P.
- ^ Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.
- ^ Pilcher, Frederick (October 2015), "Rotation Period Determination for 134 Sophrosyne, 521 Brixia and 873 Mechthild", The Minor Planet Bulletin, 42 (4): 280–281, Bibcode:2015MPBu...42..280P.
- Taylor, G. E., "Progress in accurate determinations of diameters of minor planets", Asteroids, comets, meteors; Proceedings of the Meeting, Uppsala, Sweden, June 20–22, 1983, pp. 107–109, Bibcode:1983acm..proc..107T.
External links
- 134 Sophrosyne at AstDyS-2, Asteroids—Dynamic Site
- 134 Sophrosyne at the JPL Small-Body Database
| Minor planets navigator | |
|---|---|
| Small Solar System bodies | |||||||
|---|---|---|---|---|---|---|---|
| Minor planets |
| ||||||
| Comets | |||||||
| Other | |||||||
_mathilde.jpg){kind=small} | This article about a C-type asteroid native to the asteroid belt is a stub. You can help Misplaced Pages by expanding it. |