108 Hecuba

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

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]

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.[citation needed]

References

  1. ^ "Hecuba". Dictionary.com Unabridged (Online). n.d.
  2. ^ a b c 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" (PDF), 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, vol. 63, San Francisco: Astronomical Society of the Pacific, 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.