86 Semele

86 Semele
Discovery
Discovered by	Friedrich Tietjen
Discovery date	January 4, 1866
Designations
MPC designation	(86) Semele
Pronunciation	/ˈsɛmɪlə/[1]
Named after	Semele
Minor planet category	Main belt
Adjectives	Semelean /sɛmɪˈleɪən/[2]
Orbital characteristics[3]
	Epoch December 31, 2006 (JD 2454100.5)
Aphelion	562.652 Gm (3.761 AU)
Perihelion	369.116 Gm (2.467 AU)
Semi-major axis	465.884 Gm (3.114 AU)
Eccentricity	0.208
Orbital period	2,007.366 d (5.50 a)
Average orbital speed	16.69 km/s
Mean anomaly	264.875°
Inclination	4.822°
Longitude of ascending node	86.452°
Argument of perihelion	307.886°
Physical characteristics
Dimensions	120.6 km
Mass	1.8×1018 kg
Equatorial surface gravity	0.0337 m/s²
Equatorial escape velocity	0.0638 km/s
Geometric albedo	0.047 [4]
Spectral type	C
Absolute magnitude (H)	8.54

Semele (minor planet designation: 86 Semele) is a large and very dark main-belt asteroid. It is probably composed of carbonates. Semele was discovered by German astronomer Friedrich Tietjen on January 4, 1866.[5] 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.[6]

References

"Semele". Lexico UK Dictionary. Oxford University Press.
Robert Calverley Trevelyan (1898) Mallow and Asphadel, p. 4.
Yeomans, Donald K., "86 Semele", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 7 April 2013.
Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
"Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
Šidlichovský, M. (1999), Svoren, J.; Pittich, E. M.; Rickman, H. (eds.), "Resonances and chaos in the asteroid belt", Evolution and source regions of asteroids and comets : proceedings of the 173rd colloquium of the International Astronomical Union, held in Tatranska Lomnica, Slovak Republic, August 24–28, 1998, pp. 297–308, Bibcode:1999esra.conf..297S.

External links

86 Semele at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
86 Semele at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

[1] "Semele". Lexico UK Dictionary. Oxford University Press.

[2] Robert Calverley Trevelyan (1898) Mallow and Asphadel, p. 4.

[JPL-3] Yeomans, Donald K., "86 Semele", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 7 April 2013.

[4] Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine

[IAU_MPC-5] "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.

[Sidlichovsky-6] Šidlichovský, M. (1999), Svoren, J.; Pittich, E. M.; Rickman, H. (eds.), "Resonances and chaos in the asteroid belt", Evolution and source regions of asteroids and comets : proceedings of the 173rd colloquium of the International Astronomical Union, held in Tatranska Lomnica, Slovak Republic, August 24–28, 1998, pp. 297–308, Bibcode:1999esra.conf..297S.