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 | |||||||||||||
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]
JPL
was invoked but never defined (see the help page).Krasinsky2002
was invoked but never defined (see the help page).PDS
was invoked but never defined (see the help page).DeMeo2011
was invoked but never defined (see the help page).IAU_MPC
was invoked but never defined (see the help page).Broz2005
was invoked but never defined (see the help page).McDonald1948
was invoked but never defined (see the help page).Blanco1994
was invoked but never defined (see the help page).DeMeo2009
was invoked but never defined (see the help page).Warner2007
was invoked but never defined (see the help page).