108 Hecuba information

108 Hecuba
	Orbital diagram
Discovery
Discovered by	R. Luther
Discovery date	2 April 1869
Designations
MPC designation	(108) Hecuba
Pronunciation	/ˈhɛkjʊbə/
Named after	Hecuba
Minor planet category	Main belt
Orbital characteristics
	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)
Semi-major axis	3.23912 AU (484.565 Gm)
Eccentricity	0.055539
Orbital period (sidereal)	5.83 yr (2129.3 d)
Average orbital speed	16.53 km/s
Mean anomaly	166.649°
Mean motion	0° 10m 8.648s / day
Inclination	4.2204°
Longitude of ascending node	350.014°
Argument of perihelion	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; 65 km
Mass	~3.9×1017 kg (estimate)
Mean density	~2.7 g/cm3 (estimate)
Equatorial surface gravity	~0.025 m/s² (estimate)
Equatorial escape velocity	~0.040 km/s (estimate)
Synodic rotation period	14.256 h (0.5940 d); 0.60 d or 1.20 d
Geometric albedo	0.2431±0.037
Spectral type	S
Absolute magnitude (H)	8.09

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]

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]}

^ "Hecuba". Dictionary.com Unabridged (Online). n.d.
^ ^a ^b ^c Cite error: The named reference JPL was invoked but never defined (see the help page).
^ "IRAS Minor Planet Survey (IMPS)". Archived from the original on 22 December 2005. Retrieved 11 December 2005.
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[1] "Hecuba". Dictionary.com Unabridged (Online). n.d.

[JPL-2] 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.

[Krasinsky2002-4] Cite error: The named reference Krasinsky2002 was invoked but never defined (see the help page).

[PDS-5] Cite error: The named reference PDS was invoked but never defined (see the help page).

[DeMeo2011-6] Cite error: The named reference DeMeo2011 was invoked but never defined (see the help page).

[IAU_MPC-7] Cite error: The named reference IAU_MPC was invoked but never defined (see the help page).

[Broz2005-8] Cite error: The named reference Broz2005 was invoked but never defined (see the help page).

[McDonald1948-9] Cite error: The named reference McDonald1948 was invoked but never defined (see the help page).

[Blanco1994-10] Cite error: The named reference Blanco1994 was invoked but never defined (see the help page).

[DeMeo2009-11] Cite error: The named reference DeMeo2009 was invoked but never defined (see the help page).

[Warner2007-12] Cite error: The named reference Warner2007 was invoked but never defined (see the help page).

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