346 Hermentaria

Hermentaria (minor planet designation: 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.

346 Hermentaria
Discovery
Discovered byAuguste Charlois
Discovery date25 November 1892
Designations
(346) Hermentaria
Pronunciation/hɜːrmənˈtɛəriə/
Named after
Herment
1892 P
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc123.38 yr (45,066 d)
Aphelion3.08 AU (460.65 Gm)
Perihelion2.51 AU (376.15 Gm)
2.80 AU (418.40 Gm)
Eccentricity0.10098
4.68 yr (1,708.5 d)
188.671°
0° 12m 38.578s / day
Inclination8.74967°
91.9628°
292.035°
Physical characteristics
Dimensions106.52±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]
28.43 h (1.18 d)[1]
17.790 h (0.74 d)[3]
28.523 h (1.19 d)[4]
0.2189±0.009
S
7.13

    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
    1. "346 Hermentaria (1892 P)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory1. Retrieved 11 May 2016.
    2. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    3. 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, 318, pp. 185–192, Bibcode:2016IAUS..318..185W, doi:10.1017/S1743921315008777
    4. 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
    5. Schmadel, Lutz D. (11 November 2013), Dictionary of Minor Planet Names, Berlin Heidelberg: Springer, p. 66, ISBN 9783662066157
    6. 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
    7. 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, 1240, Bibcode:2005LPI....36.1240H

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