133 Cyrene

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133 Cyrene
133 Cyrene.png
A 3D lightcurve-derived model of 133 Cyrene.
Discovery [1]
Discovered by James Craig Watson
Discovery site Ann Arbor, Michigan, United States
Discovery date16 August 1873
Designations
(133) Cyrene
Pronunciation /saɪˈriːniː/ [2]
Named after
 Cyrene (nymph)
A873 QA ·A910 NB ·1936 HO ·1948 QC ·1959 UR [3] [a]
Main belt
Adjectives Cyrenean /saɪrɪˈniːən/ , Cyrenian /saɪˈriːniən/ [4]
Orbital characteristics [3]
Epoch 21 November 2025 (JD 2461000.5)
Uncertainty parameter 0
Observation arc 152.13 yr (55566 d)
Aphelion 7.2245 AU (1,080.77 Gm)
Perihelion 2.6736 AU (399.96 Gm)
3.0742 AU (459.89 Gm)
Eccentricity 0.1303
5.3902 yr (1968.77 d)
Average orbital speed
17.03 km/s
219.02°
0° 10m 58.26s / day
Inclination 7.2245°
318.67°
291.65°
Earth  MOID 1.6686 AU (249.62 Gm)
Jupiter  MOID 1.6595 AU (248.26 Gm)
TJupiter 3.205
Physical characteristics
Dimensions 66.57±6.0 km
Mass 3.1 × 1017 kg
Mean density
2.0? g/cm3
Equatorial surface gravity
0.0186 m/s²
Equatorial escape velocity
0.0352 km/s
12.708 h (0.5295 d) [3]
12.707 h (0.5295 d) [5]
0.2563±0.053 [3]
0.2563 [6]
Temperature ~133 K
S [6]
7.98, [3] 7.990 [7]

    133 Cyrene is a fairly large and very bright main-belt asteroid that was discovered by J. C. Watson on 16 August 1873 in Ann Arbor, Michigan, and named after Cyrene, a nymph, daughter of king Hypseus and beloved of Apollo in Greek mythology. [8] It is classified as an S-type asteroid based upon its spectrum. It is listed as a member of the Hecuba group of asteroids that orbit near the 2:1 mean-motion resonance with Jupiter. [9]

    Contents

    Discovery and naming

    Cyrene was discovered on 16 August 1873 by astronomer James Craig Watson at Ann Arbor, Michigan, United States. [1] Its discovery, alongside that of 132 Aethra, was announced in the journal Astronomische Nachrichten on 30 August. [10] The asteroid was given the name Cyrene after the Greek mythological figure Cyrene, daughter of the Lapithian king Hypseus. With the god Apollo, she bore her two sons Aristaeus and Idmon. [11] : 25 

    Orbit

    An orbital diagram of 133 Cyrene. The ecliptic grid and the orbits of the inner planets and Jupiter are also shown. (133) Cyrene orbit.png
    An orbital diagram of 133 Cyrene. The ecliptic grid and the orbits of the inner planets and Jupiter are also shown.

    Cyrene is a main belt asteroid, orbiting the Sun at an average distance—its semi-major axis—of 3.07 astronomical units (AU). Along its 5.39 year long orbit, its distance from the Sun varies from 2.67 AU at perihelion to 3.47 AU at aphelion due to its orbital eccentricity of 0.13. It has an orbital inclination of 7.22° with respect to the ecliptic plane. [3]

    Physical characteristics

    In the Tholen classification system, it is categorized as a stony SR-type asteroid. [12] Photometric observations of this asteroid at the Altimira Observatory in 1985 gave a light curve with a period of 12.707 ± 0.015 hours and a brightness variation of 0.22 in magnitude. This result matches previous measurements reported in 1984 and 2005. [5]

    See also

    Minor planets named after figures related to Cyrene:

    Notes

    1. ↑ The MPC notates Aethra's retroactive new-style designations as 1873 QA and 1910 NB. [1]

    References

    1. 1 2 3 "(133) Cyrene = 1873 QA = 1910 NB = 1936 HO = 1948 QC = 1959 UR". Minor Planet Center . Retrieved 5 November 2025.
    2. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
    3. 1 2 3 4 5 6 Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory , retrieved 12 May 2016.
    4. ↑ "Cyrenean" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
    5. 1 2 Buchheim, Robert K. (June 2006), "Photometry of asteroids 133 Cyrene, 454 Mathesis, 477 Italia, and 2264 Sabrina", Astronomy and Astrophysics Supplement Series, vol. 33, no. 2, pp. 29–30, Bibcode:2006MPBu...33...29B.
    6. 1 2 Richmond, Michael (1 March 2001), "Asteroid Lightcurve Data File", Astronomy and Astrophysics Supplement Series, retrieved 29 March 2013.
    7. ↑ 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.
    8. ↑ Schmadel, Lutz D.; International Astronomical Union (2003), Dictionary of minor planet names, Berlin; New York: Springer-Verlag, p. 27, ISBN   978-3-540-00238-3.
    9. ↑ McDonald, Sophia Levy (June 1948), "General perturbations and mean elements, with representations of 35 minor planets of the Hecuba group", Astronomical Journal, vol. 53, p. 199, Bibcode:1948AJ.....53..199M, doi:10.1086/106097.
    10. ↑ Watson, James Craig (30 August 1873). "Correspondence - Discovery of Two New Planets". Astronomical Register. 11: 284. Bibcode:1873AReg...11..284W.
    11. ↑ Schmadel, Lutz (2003), Dictionary of minor planet names, vol. 1, Springer, p. 68, ISBN   9783540002383.
    12. ↑ DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, vol. 202, no. 1, pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.
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