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346 Hermentaria
Discovery
Orbital diagram
Discovered by	Auguste Charlois
Discovery date	25 November 1892
Designations
MPC designation	(346) Hermentaria
Pronunciation	/hɜːrmənˈtɛəriə/
Named after	Herment
Alternative designations	1892 P
Minor planet category	Main belt
Orbital characteristics^[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	123.38 yr (45,066 d)
Aphelion	3.08 AU (460.65 Gm)
Perihelion	2.51 AU (376.15 Gm)
Semi-major axis	2.80 AU (418.40 Gm)
Eccentricity	0.10098
Orbital period (sidereal)	4.68 yr (1,708.5 d)
Mean anomaly	188.671°
Mean motion	0° 12^m 38.578^s / day
Inclination	8.74967°
Longitude of ascending node	91.9628°
Argument of perihelion	292.035°
Physical characteristics
Dimensions	106.52±2.2 km^[1] 93.27±3.05 km^[2]
Mass	(6.33±0.18)×10¹⁸ kg^[2]
Mean density	14.89±1.52 g/cm³^[2]
Synodic rotation period	28.43 h (1.18 d)^[1] 17.790 h (0.74 d)^[3] 28.523 h (1.19 d)^[4]
Geometric albedo	0.2189±0.009
Spectral type	S
Absolute magnitude (H)	7.13

346 Hermentaria is a very large main-belt asteroid. It was discovered by French astronomer Auguste Charlois on 25 November 1892, in Nice. It is probably named for the town of Herment in the region of Auvergne, France.^[5] The asteroid is orbiting the Sun with a period of 4.68 years and an eccentricity (ovalness) of 0.10. The orbital plane is inclined by 8.7° to the plane of the ecliptic.

This body has a rotation period of 28.523±0.001 h during which it varies in brightness with an amplitude of 0.14±0.01 magnitude.^[4] It has a cross-section diameter of ~100 km. 346 Hermentaria is classified as a (stony) S-type asteroid, indicating a siliceous mineralogical composition. The near infrared spectra of this object show absorption features that suggest a mix of the minerals clinopyroxene and orthopyroxene.^[6] It may be thermally–evolved, having at least partially melted at some point.^[7] The overall shape resembles a prolate spheroid.^[3]

References

^ ^a ^b ^c "346 Hermentaria (1892 P)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory1. Retrieved 11 May 2016.
^ ^a ^b ^c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
^ ^a ^b Wang, Xiaobin; et al. (January 2016), "Studies for slowly rotating asteroids (168) Sibylla and (346) Hermentaria", Asteroids: New Observations, New Models, Proceedings of the International Astronomical Union, IAU Symposium, vol. 318, pp. 185–192, Bibcode:2016IAUS..318..185W, doi:10.1017/S1743921315008777
^ ^a ^b Pilcher, Frederick (July 2016), "Rotation Period Determinations for 123 Brunhild, 314 Rosalia 346 Hermentaria, 633 Zelima, and 730 Athanasia", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, 43 (3): 222−224, Bibcode:2016MPBu...43..222P
^ Schmadel, Lutz D. (11 November 2013), Dictionary of Minor Planet Names, Berlin Heidelberg: Springer, p. 66, ISBN 9783662066157
^ Hardersen, Paul S.; et al. (March 2006), "Near-infrared spectral observations and interpretations for S-asteroids 138 Tolosa, 306 Unitas, 346 Hermentaria, and 480 Hansa", Icarus, 181 (1): 94–106, Bibcode:2006Icar..181...94H, doi:10.1016/j.icarus.2005.10.003
^ Hardersen, P. S.; et al. (March 2005), "Detailed Mineralogical Characterizations of Four S-Asteroids: 138 Tolosa, 306 Unitas, 346 Hermentaria, and 480 Hansa", 36th Annual Lunar and Planetary Science Conference, March 14–18, 2005, in League City, Texas, vol. 1240, Bibcode:2005LPI....36.1240H

External links

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

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