117 Lomia

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117 Lomia
Discovery
Discovered by Alphonse Borrelly
Discovery date September 12, 1871
Designations
Alternative names  
Minor planet category Main belt
Orbital characteristics[1]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 460.170 Gm (3.076 AU)
Perihelion 434.790 Gm (2.906 AU)
Semi-major axis 447.480 Gm (2.991 AU)
Eccentricity 0.0287
Orbital period 1889.604 d (5.17 a)
Average orbital speed 17.22 km/s
Mean anomaly 0.674°
Inclination 14.928°
Longitude of ascending node 348.991°
Argument of perihelion 62.315°
Physical characteristics
Dimensions 146.78 ± 3.96[2] km
Mass (6.08 ± 0.63) × 1018[2] kg
Mean density 3.67 ± 0.48[2] g/cm3
Equatorial surface gravity 0.0416 m/s²
Escape velocity 0.0786 km/s
Albedo 0.053[3]
Temperature ~161 K
Spectral type XC[3]
Absolute magnitude (H) 7.95

117 Lomia is a large main-belt asteroid that has a nearly circular orbit; the orbital eccentricity is 0.029.[1] It was discovered by French astronomer Alphonse Borrelly on September 12, 1871 from the Marseilles Observatory.[4] The preliminary orbital elements were published in the following year by German astronomer Friedrich Tietjen.[5] The reason for the name is uncertain, but Lutz D. Schmadel believes it is most likely a misspelling of Lamia, the female demon of Greek mythology (the asteroid 248 Lameia is also named after this figure).[4]

Photometric observations of this asteroid in 1985 gave a light curve with a period of 9.127 ± 0.009 hours and a brightness variation of 0.29 ± 0.03 in magnitude. The curve is symmetrical with a single maxima and minima. This object has a spectrum that matches an XC classification; occupying the transition range between an X-type and a C-type asteroid.[3]

Two occultations of stars by Lomia have so far been observed, in 2000 and 2003.

References[edit]

  1. ^ a b Yeomans, Donald K., "117 Lomia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25. 
  2. ^ 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.
  3. ^ a b c di Martino, M. et al. (July 1995), "Intermediate size asteroids: Photoelectric photometry of 8 objects.", Astronomy and Astrophysics Supplement 112: 1-7, Bibcode:1995A&AS..112....1D. 
  4. ^ a b Lutz D. Schmadel, Dictionary of Minor Planet Names, p. 25.
  5. ^ Tietjen, F. (1872), "Elemente und Ephemeride des Planeten (117) Lomia", Astronomische Nachrichten 78 (21): 329-330, doi:10.1002/asna.18710782106.  See Table 1.