134 Sophrosyne

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134 Sophrosyne
134 Sophrosyne.png
A 3D lightcurve model of 134 Sophrosyne.
Discovery
Discovered by Karl Theodor Robert Luther
Discovery date27 September 1873
Designations
(134) Sophrosyne
Pronunciation /soʊˈfrɒsɪniː/ [1]
Named after
 sophrosyne
Main belt
Orbital characteristics [2]
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)
2.56295 AU (383.412 Gm)
Eccentricity 0.11699
4.10 yr (1498.7 d)
Average orbital speed
18.54 km/s
229.885°
0° 14m 24.76s / day
Inclination 11.6018°
345.986°
84.7156°
Earth  MOID 1.31034 AU (196.024 Gm)
Jupiter  MOID 2.42537 AU (362.830 Gm)
TJupiter 3.396
Physical characteristics
108 [2]
112.188 km [3]
Mass (1.267 ± 0.575/0.398)×1018 kg [4]
Mean density
1.713 ± 0.778/0.538 g/cm3 [4]
Equatorial surface gravity
0.029 m/s2
Equatorial escape velocity
0.056 km/s
17.190  h (0.7163  d) [5]
0.0364±0.001 [2]
0.0436 ± 0.0122 [3]
Temperature ~174 K
C (Tholen) [3]
9.04, [2] 8.770 [3]

    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.[ citation needed ]

    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. [6] 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. [5]

    References

    1. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
    2. 1 2 3 4 Yeomans, Donald K., "134 Sophrosyne", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory , retrieved 12 May 2016.
    3. 1 2 3 4 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.
    4. 1 2 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 .
    5. 1 2 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.
    6. ↑ 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.


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