34 Circe

34 Circe
	A three-dimensional model of 34 Circe based on its light curve
Discovery
Discovered by	J. Chacornac
Discovery date	April 6, 1855
Designations
Designation	(34) Circe
Pronunciation	/ˈsɜːrsiː/
Named after	Circe
Alternative names	1965 JL
Minor planet category	Main belt
Adjectives	Circean /sərˈsiːən/
Orbital characteristics
	Epoch November 4, 2013 (JD 2456600.5)
Aphelion	2.967739 AU
Perihelion	2.406230 AU
Semi-major axis	2.686984 AU
Eccentricity	0.1045
Orbital period (sidereal)	4.40 a (1607.332 d)
Average orbital speed	18.12 km/s
Mean anomaly	39.80474°
Inclination	5.498°
Longitude of ascending node	184.44157°
Argument of perihelion	330.2330°
Physical characteristics
Dimensions	113.02 ± 4.90 km
Mass	(3.66 ± 0.03) × 1018 kg
Mean density	4.83 ± 0.63 g/cm3
Surface gravity	~0.0317 m/s²
Escape velocity	~0.0600 km/s
Synodic rotation period	0.5063 d (12.15 h)
Albedo	0.0541
Temperature	~172 K
Spectral type	C
Absolute magnitude (H)	8.51

Circe, minor planet designation 34 Circe, is a large, very dark main-belt asteroid. It was discovered by French astronomer J. Chacornac on April 6, 1855, and named after Circe, the bewitching queen of Aeaea island in Greek mythology.

The spectrum of this object matches a C-type asteroid, suggesting a carbonaceous composition. It has a cross-section size of 113 km and is orbiting the Sun with a period of 4.40 years. Photometric observations of this asteroid made during 2007 at the Organ Mesa Observatory in Las Cruces, New Mexico gave an asymmetrical bimodal light curve with a period of 12.176 ± 0.002 hours and a brightness variation of 0.17 ± 0.02 in magnitude.^[5] The spectra of the asteroid displays evidence of aqueous alteration.^[6]

References[]

^ "Circe". Lexico UK English Dictionary. Oxford University Press. n.d.
^ "Circean". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ ^a ^b ^c Yeomans, Donald K., "34 Circe", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 21 December 2013.
^ ^a ^b ^c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
^ Pilcher, Frederick (September 2008), "Period Determinations for 26 Proserpina, 34 Circe 74 Galatea, 143 Adria, 272 Antonia, 419 Aurelia, and 557 Violetta", The Minor Planet Bulletin, 35 (3): 135–138, Bibcode:2008MPBu...35..135P.
^ Fornasier, S.; et al. (February 1999), "Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites", Astronomy and Astrophysics Supplement, 135: 65−73, Bibcode:1999A&AS..135...65F, doi:10.1051/aas:1999161.

External links[]

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

[1] "Circe". Lexico UK English Dictionary. Oxford University Press. n.d.

[2] "Circean". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[JPL-3] Yeomans, Donald K., "34 Circe", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 21 December 2013.

[Carry2012-4] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[Pilcher2008-5] Pilcher, Frederick (September 2008), "Period Determinations for 26 Proserpina, 34 Circe 74 Galatea, 143 Adria, 272 Antonia, 419 Aurelia, and 557 Violetta", The Minor Planet Bulletin, 35 (3): 135–138, Bibcode:2008MPBu...35..135P.

[Fornasier1999-6] Fornasier, S.; et al. (February 1999), "Spectroscopic comparison of aqueous altered asteroids with CM2 carbonaceous chondrite meteorites", Astronomy and Astrophysics Supplement, 135: 65−73, Bibcode:1999A&AS..135...65F, doi:10.1051/aas:1999161.

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