108 Hecuba

Hecuba (minor planet designation: 108 Hecuba) is a fairly large and bright main-belt asteroid. It was discovered by Karl Theodor Robert Luther on 2 April 1869,[7] and named after Hecuba, wife of King Priam in the legends of the Trojan War in Greek Mythology. This object is orbiting the Sun with a period of 5.83 years and an eccentricity of 0.06. It became the first asteroid discovered to orbit near a 2:1 mean-motion resonance with the planet Jupiter,[8] and is the namesake of the Hecuba group of asteroids.[9]

108 Hecuba
Orbital diagram
Discovery
Discovered byR. Luther
Discovery date2 April 1869
Designations
(108) Hecuba
Pronunciation/ˈhɛkjʊbə/[1]
Named after
Hecuba
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc135.87 yr (49628 d)
Aphelion3.4190 AU (511.48 Gm)
Perihelion3.05922 AU (457.653 Gm)
3.23912 AU (484.565 Gm)
Eccentricity0.055539
5.83 yr (2129.3 d)
16.53 km/s
166.649°
0° 10m 8.648s / day
Inclination4.2204°
350.014°
204.634°
Earth MOID2.05833 AU (307.922 Gm)
Jupiter MOID1.55152 AU (232.104 Gm)
TJupiter3.178
Physical characteristics
Dimensions64.97±4.4 km[2]
65 km[3]
Mass~3.9×1017 kg (estimate)
Mean density
~2.7 g/cm3 (estimate)[4]
Equatorial surface gravity
~0.025 m/s² (estimate)
Equatorial escape velocity
~0.040 km/s (estimate)
14.256 h (0.5940 d)[2]
0.60 d or 1.20 d[5]
0.2431±0.037
Surface temp. min mean max
Kelvin ~148 215
Celsius -58
S[6]
8.09

    In the Tholen classification system, it is categorized as a stony S-type asteroid,[10] while the Bus asteroid taxonomy system lists it as an Sw asteroid.[11] Observations performed at the Palmer Divide Observatory in Colorado Springs, Colorado in during 2007 produced a light curve with a period of 17.859 ± 0.005 hours with a brightness variation of 0.11 ± 0.02 in magnitude.[12]

    Hecuba orbits within the Hygiea family of asteroids but is not otherwise related to other family members because it has a silicate composition; Hygieas are dark C-type asteroids.

    References
    1. "Hecuba". Dictionary.com Unabridged (Online). n.d.
    2. Yeomans, Donald K., "108 Hecuba", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    3. "IRAS Minor Planet Survey (IMPS)". Archived from the original on 22 December 2005. Retrieved 11 December 2005.
    4. Krasinsky, G. A.; et al. (July 2002), "Hidden Mass in the Asteroid Belt", Icarus, 158 (1): 98–105, Bibcode:2002Icar..158...98K, doi:10.1006/icar.2002.6837. See appendix A.
    5. Harris, A.W.; Warner, B.D.; Pravec, P., eds. (2012), "Lightcurve Derived Data", Planetary Data System, NASA, retrieved 22 March 2013.
    6. DeMeo, Francesca E.; et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014. See appendix A.
    7. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    8. Brož, M.; Vokrouhlický, D.; Roig, F.; Nesvorný, D.; Bottke, W. F.; Morbidelli, A. (June 2005), "Yarkovsky origin of the unstable asteroids in the 2/1 mean motion resonance with Jupiter", Monthly Notices of the Royal Astronomical Society, 359 (4): 1437–1455, Bibcode:2005MNRAS.359.1437B, doi:10.1111/j.1365-2966.2005.08995.x.
    9. McDonald, Sophia Levy (June 1948), "General perturbations and mean elements, with representations of 35 minor planets of the Hecuba group", Astronomical Journal, 53: 199, Bibcode:1948AJ.....53..199M, doi:10.1086/106097.
    10. Blanco, C.; et al. (1994), Kozai, Yoshihide; Binzel, Richard P.; Hirayama, Tomohiro (eds.), "A Physical Study of the Asteroid 108 Hecuba", Seventy-five (75) years of Hirayama asteroid families: The role of collisions in the solar system history; Proceedings of the international conference; held November 29-December 3; 1993 at the Institute of Space and Astronautical Science (ISAS) at Sagamihara near Tokyo; Japan, Astronomical Society of the Pacific Conference, San Francisco: Astronomical Society of the Pacific, vol. 63, p. 280, Bibcode:1994ASPC...63..280B
    11. DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 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.
    12. Warner, Brian D. (September 2007), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory", The Minor Planet Bulletin, 34 (3): 72, Bibcode:2007MPBu...34...72W.

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