(117) Lomia

117 Lomia
Discovered byAlphonse Borrelly
Discovery date12 September 1871
(117) Lomia
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc123.03 yr (44938 d)
Aphelion3.0759 AU (460.15 Gm)
Perihelion2.90810 AU (435.046 Gm)
2.99201 AU (447.598 Gm)
5.18 yr (1890.4 d)
17.22 km/s
0° 11m 25.584s / day
Earth MOID1.92459 AU (287.915 Gm)
Jupiter MOID2.0407 AU (305.28 Gm)
Physical characteristics
Dimensions148.71±6.6 km[2]
146.78 ± 3.96 km[3]
Mass(6.08 ± 0.63) × 1018 kg[3]
Mean density
3.67 ± 0.48 g/cm3[3]
Equatorial surface gravity
0.0416 m/s²
Equatorial escape velocity
0.0786 km/s
9.127 h (0.3803 d)
Temperature~161 K

Lomia (minor planet designation: 117 Lomia) is a large main-belt asteroid that has a nearly circular orbit; the orbital eccentricity is 0.029.[2] It was discovered by French astronomer Alphonse Borrelly on September 12, 1871, from the Marseilles Observatory.[5] The preliminary orbital elements were published in the following year by German astronomer Friedrich Tietjen.[6] 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).[5]

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.[4] It has an estimated cross-section diameter of ~148 km.

Eight occultations of stars by Lomia have so far been observed, between 2000 and 2018. Four of these events provided two or more chords across the asteroid, including a four-chord event in 2003.


  1. ^ Per 'Lamia', which this is a misspelling of.
  2. ^ a b c d Yeomans, Donald K., "117 Lomia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016. CS1 maint: discouraged parameter (link)
  3. ^ 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.
  4. ^ a b c di Martino, M.; et al. (July 1995), "Intermediate size asteroids: Photoelectric photometry of 8 objects.", Astronomy and Astrophysics Supplement, 112, pp. 1–7, Bibcode:1995A&AS..112....1D.
  5. ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. p. 25. ISBN 978-3-540-00238-3.
  6. ^ Tietjen, F. (1872), "Elemente und Ephemeride des Planeten (117) Lomia", Astronomische Nachrichten, 78 (21): 329–330, doi:10.1002/asna.18710782106. See Table 1.

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