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]

  1. ^ "Hecuba". Dictionary.com Unabridged (Online). n.d.
  2. ^ a b c Cite error: The named reference JPL was invoked but never defined (see the help page).
  3. ^ "IRAS Minor Planet Survey (IMPS)". Archived from the original on 22 December 2005. Retrieved 11 December 2005.
  4. ^ Cite error: The named reference Krasinsky2002 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference PDS was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference DeMeo2011 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference IAU_MPC was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Broz2005 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference McDonald1948 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Blanco1994 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference DeMeo2009 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Warner2007 was invoked but never defined (see the help page).