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]
 Orbital diagram | |||||||||||||
| Discovery | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Discovered by | R. Luther | ||||||||||||
| Discovery date | 2 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 arc | 135.87 yr (49628 d) | ||||||||||||
| Aphelion | 3.4190 AU (511.48 Gm) | ||||||||||||
| Perihelion | 3.05922 AU (457.653 Gm) | ||||||||||||
| 3.23912 AU (484.565 Gm) | |||||||||||||
| Eccentricity | 0.055539 | ||||||||||||
| 5.83 yr (2129.3 d) | |||||||||||||
Average orbital speed | 16.53 km/s | ||||||||||||
| 166.649° | |||||||||||||
| 0° 10m 8.648s / day | |||||||||||||
| Inclination | 4.2204° | ||||||||||||
| 350.014° | |||||||||||||
| 204.634° | |||||||||||||
| Earth MOID | 2.05833 AU (307.922 Gm) | ||||||||||||
| Jupiter MOID | 1.55152 AU (232.104 Gm) | ||||||||||||
| TJupiter | 3.178 | ||||||||||||
| Physical characteristics | |||||||||||||
| Dimensions | 64.97±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 | |||||||||||||
| |||||||||||||
| 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.[citation needed]
References
edit- ^ "Hecuba". Dictionary.com Unabridged (Online). n.d.
- ^ a b c Yeomans, Donald K., "108 Hecuba", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- ^ "IRAS Minor Planet Survey (IMPS)". Archived from the original on 22 December 2005. Retrieved 11 December 2005.
- ^ 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.
- ^ Harris, A.W.; Warner, B.D.; Pravec, P., eds. (2012), "Lightcurve Derived Data", Planetary Data System, NASA, retrieved 22 March 2013.
- ^ 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.
- ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
- ^ 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.
- ^ 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.
- ^ 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
- ^ 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.
- ^ Warner, Brian D. (September 2007), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory", The Minor Planet Bulletin, 34 (3): 72, Bibcode:2007MPBu...34...72W.
External links
edit- Lightcurve plot of 108 Hecuba, Palmer Divide Observatory, B. D. Warner (2007)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 108 Hecuba at AstDyS-2, Asteroids—Dynamic Site
- 108 Hecuba at the JPL Small-Body Database
