Astronomy:134 Sophrosyne

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Short description: Main-belt asteroid
134 Sophrosyne
Орбита астероида 134.png
Orbital diagram
Discovery
Discovered byKarl Theodor Robert Luther
Discovery date27 September 1873
Designations
(134) Sophrosyne
Pronunciation/sˈfrɒsɪn/[1]
Named aftersophrosyne
Minor planet categoryMain belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc138.60 yr (50625 d)
|{{{apsis}}}|helion}}2.86280 astronomical unit|AU (428.269 Gm)
|{{{apsis}}}|helion}}2.26311 AU (338.556 Gm)
2.56295 AU (383.412 Gm)
Eccentricity0.11699
Orbital period4.10 yr (1498.7 d)
Average Orbital speed18.54 km/s
Mean anomaly229.885°
Mean motion0° 14m 24.76s / day
Inclination11.6018°
Longitude of ascending node345.986°
84.7156°
Earth MOID1.31034 AU (196.024 Gm)
Jupiter MOID2.42537 AU (362.830 Gm)
TJupiter3.396
Physical characteristics
Dimensions108[2]
112.188 km[3]
Mass2.0×1018 kg
Equatorial surface gravity
0.0345 m/s2
Equatorial escape velocity
0.0652 km/s
Rotation period17.190 h (0.7163 d)[4]
Geometric albedo0.0364±0.001[2]
0.0436 ± 0.0122[3]
Physics~174 K
C (Tholen)[3]
Absolute magnitude (H)8.76,[2] 8.770[3]


Sophrosyne (minor planet designation: 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.[5] 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.[4]

References

  1. Noah Webster (1884) A Practical Dictionary of the English Language
  2. 2.0 2.1 2.2 2.3 Yeomans, Donald K., "134 Sophrosyne", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=134, retrieved 12 May 2016. 
  3. 3.0 3.1 3.2 3.3 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 (1667), Bibcode2012LPICo1667.6089P. 
  4. 4.0 4.1 Pilcher, Frederick (October 2015), "Rotation Period Determination for 134 Sophrosyne, 521 Brixia and 873 Mechthild", The Minor Planet Bulletin 42 (4): 280–281, Bibcode2015MPBu...42..280P. 
  5. 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, Bibcode1983acm..proc..107T. 

External links