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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.[citation needed]

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
MPC designation
(95) Arethusa
Pronunciation/ærəˈθjuːsə/[1]
Minor planet category
Main belt
AdjectivesArethusian,[2] Arethusean[3] /ˌærəˈθjuːziən/
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)
Semi-major axis
3.06457 AU (458.453 Gm)
Eccentricity0.15245
Orbital period (sidereal)
5.36 yr (1959.5 d)
Average orbital speed
16.91 km/s
Mean anomaly
250.185°
Mean motion
0° 11m 1.385s / day
Inclination12.9955°
Longitude of ascending node
243.038°
Argument of perihelion
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
Synodic rotation period
8.705 h (0.3627 d)
Geometric albedo
0.0698±0.012 [4]
0.070 [6]
Spectral type
C
Absolute magnitude (H)
8.0

    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. "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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    На других языках

    [de] (95) Arethusa

    (95) Arethusa ist ein Asteroid des Hauptgürtels, der am 23. November 1867 von dem deutschen Astronomen Karl Theodor Robert Luther entdeckt wurde[1].
    - [en] 95 Arethusa

    [es] (95) Arethusa

    (95) Arethusa es un asteroide que forma parte del cinturón de asteroides y fue descubierto el 23 de noviembre de 1867 por Karl Theodor Robert Luther desde el observatorio de Düsseldorf-Bilk, Alemania. Está nombrado por Aretusa, una diosecilla de la mitología griega.[2]

    [fr] (95) Aréthuse

    (95) Aréthuse, désignation internationale (95) Arethusa, est un astéroïde de la ceinture principale d'astéroïdes découvert par Robert Luther le 23 novembre 1867 à Düsseldorf.

    [it] 95 Arethusa

    95 Arethusa (in italiano 95 Aretusa) è un grande asteroide della Fascia principale. Ha una superficie scura e una composizione carboniosa e primitiva.

    [ru] (95) Аретуса

    (95) Арету́са (лат. Arethusa) — астероид главного пояса, принадлежащий к тёмному спектральному классу C. Он был открыт 23 ноября 1867 года немецким астрономом Робертом Лютером в Дюссельдорфской обсерватории, Германия и назван в честь Аретусы, одной из нимф из древнегреческой мифологии[2].


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