95 Arethusa
A three-dimensional model of 95 Arethusa based on its light curve.
Discovery
Discovered byKarl Theodor Robert Luther
Discovery date23 November 1867
Designations
(95) Arethusa
Pronunciation/ærəˈθjsə/[1]
Main belt
AdjectivesArethusian,[2] Arethusean[3] /ˌærəˈθjziən/
Orbital characteristics[4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc143.53 yr (52424 d)
Aphelion3.53176 AU (528.344 Gm)
Perihelion2.59737 AU (388.561 Gm)
3.06457 AU (458.453 Gm)
Eccentricity0.15245
5.36 yr (1959.5 d)
16.91 km/s
250.185°
0° 11m 1.385s / day
Inclination12.9955°
243.038°
154.196°
Physical characteristics
Dimensions136.04±10.1 km[4]
136.04 km
147 ± 32 km[5]
Mass2.6×1018 kg
Equatorial surface gravity
0.0380 m/s²
Equatorial escape velocity
0.0719 km/s
8.705 h (0.3627 d)
0.0698±0.012[4]
0.070[6]
C
8.0

    Arethusa (minor planet designation: 95 Arethusa) is a large main-belt asteroid. It was discovered by German astronomer Robert Luther on 23 November 1867, and named after one of the various Arethusas in Greek mythology. Arethusa has been observed occulting a star three times:[7] first on 2 February 1998, and twice in January 2003.

    This object is orbiting the Sun with a period of 5.36 years and an eccentricity of 0.15. The cross-section diameter is around 136 km and it is spinning with a rotation period of 8.7 hours. The spectrum matches a C-type asteroid, indicating a dark surface with a primitive carbonaceous composition.

    References

    1. Benjamin Smith (1903) The Century Dictionary and Cyclopedia
    2. White & Riddle (1904) A Latin-English Dictionary for the Use of Junior Students
    3. Lucas Carpenter (1989) Selected Essays of Fletcher, p. 186
    4. 1 2 3 "95 Arethusa". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
    5. Ďurech, Josef; Kaasalainen, Mikko; Herald, David; Dunham, David; Timerson, Brad; Hanuš, Josef; et al. (2011). "Combining asteroid models derived by lightcurve inversion with asteroidal occultation silhouettes" (PDF). Icarus. 214 (2): 652–670. arXiv:1104.4227. Bibcode:2011Icar..214..652D. doi:10.1016/j.icarus.2011.03.016. Archived from the original (PDF) on 3 March 2016. Retrieved 26 January 2012.
    6. "Asteroid Data Sets". Archived from the original on 17 December 2009. Retrieved 14 January 2007.
    7. Herald, David; et al. (October 2020), "Precise astrometry and diameters of asteroids from occultations - a data set of observations and their interpretation", Monthly Notices of the Royal Astronomical Society, 499 (3): 4570–4590, arXiv:2010.06086, Bibcode:2020MNRAS.499.4570H, doi:10.1093/mnras/staa3077


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