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86 Semele

Main-belt asteroid

Field	Value
minorplanet	yes
background	#D6D6D6
image	86 Semele.png
caption	3D Lightcurve model of 86 Semele.
name	86 Semele
discoverer	Friedrich Tietjen
discovered	January 4, 1866
mpc_name	(86) Semele
pronounced
adjective	Semelean
named_after	Semele
mp_category	Main belt
orbit_ref
epoch	December 31, 2006 (JD 2454100.5)
semimajor	465.884 million km (3.114 AU)
perihelion	369.116 million km (2.467 AU)
aphelion	562.652 million km (3.761 AU)
eccentricity	0.208
period	2007.366 day
inclination	4.822°
asc_node	86.452°
arg_peri	307.886°
mean_anomaly	264.875°
avg_speed	16.69 km/s
dimensions	120.6 km
mass	1.8 kg
surface_grav	0.0337 m/s²
escape_velocity	0.0638 km/s
rotation
spectral_type	C
abs_magnitude	8.54
albedo	0.047

86 Semele is a large and very dark main-belt asteroid with an orbital period of 5.5 years. It is rotating with a period of 16.6 hours, and varies in magnitude by 0.13 during each cycle. This object is classified as a C-type asteroid and is probably composed of carbonates.

Semele was discovered by German astronomer Friedrich Tietjen on January 4, 1866. It was his first and only asteroid discovery. It is named after Semele, the mother of Dionysus in Greek mythology.

The orbit of 86 Semele places it in a 13:6 mean motion resonance with the planet Jupiter. The computed Lyapunov time for this asteroid is only 6,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets. This Lyapunov time is the second lowest among the first 100 named minor planets.

References

"Semele". [[Oxford University Press]].
Robert Calverley Trevelyan (1898) ''Mallow and Asphadel'', p. 4.
[http://www.psi.edu/pds/resource/albedo.html Asteroid Data Sets] {{webarchive. link. (2009-12-17)

Info: Wikipedia Source

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