146 Lucina

Lucina (minor planet designation: 146 Lucina) is a main-belt asteroid that was discovered by Alphonse Borrelly on June 8, 1875, and named after Lucina, the Roman goddess of childbirth. It is large, dark and has a carbonaceous composition. The spectra of the asteroid displays evidence of aqueous alteration.[7]

146 Lucina
A three-dimensional model of 146 Lucina based on its light curve.
Discovery[1]
Discovered byAlphonse Borrelly
Discovery date8 June 1875
Designations
(146) Lucina
Pronunciation/luːˈsaɪnə/[2] or as Latin Lūcīna[3]
Main belt
Orbital characteristics[4][5]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc130.35 yr (47610 d)
Aphelion2.89945 AU (433.752 Gm)
Perihelion2.53641 AU (379.442 Gm)
2.71793 AU (406.597 Gm)
Eccentricity0.066786
4.48 yr (1636.6 d)
18.04 km/s
198.102°
0° 13m 11.863s / day
Inclination13.0947°
83.9692°
146.982°
Earth MOID1.53233 AU (229.233 Gm)
Jupiter MOID2.14062 AU (320.232 Gm)
TJupiter3.319
Physical characteristics
Dimensions132.21±2.4 km[5]
131.893 km[6]
Mass2.4×1018 kg
Mean density
2.0 g/cm³
Equatorial surface gravity
0.0369 m/s²
Equatorial escape velocity
0.0699 km/s
18.557 h (0.7732 d)
0.0531±0.002[5]
0.0496 ± 0.0107[6]
Temperature~169 K
C[6] (Tholen)
8.20,[5] 8.277[6]

    Photometric observations of this asteroid made during 1979 and 1981 gave a light curve with a period of 18.54 hours.[8]

    Two stellar occultations by Lucina have been observed so far, in 1982 and 1989. During the first event, a possible small satellite with an estimated 5.7 km diameter was detected at a distance of 1,600 km from 146 Lucina.[9] A 1992 search using a CCD failed to discover a satellite larger than 0.6 km, although it may have been obscured by occultation mask.[10] Further evidence for a satellite emerged in 2003, this time based on astrometric measurements.[11]

    References
    2. Noah Webster (1884) A Practical Dictionary of the English Language
    3. Lucina
    4. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
    5. Yeomans, Donald K., "146 Lucina", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    6. Pravec, P.; et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan, 1667 (1667), p. 6089, Bibcode:2012LPICo1667.6089P. See Table 4.
    7. 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.
    8. Schober, H. J. (July 1983), "The large C-type asteroids 146 Lucina and 410 Chloris, and the small S-type asteroids 152 Atala and 631 Philippina - Rotation periods and lightcurves", Astronomy and Astrophysics Supplement Series, 53: 71–75, Bibcode:1983A&AS...53...71S.
    9. Arlot, J. E.; et al. (February 1985), "A possible satellite of (146) Lucina", Icarus, 61 (2): 224–231, Bibcode:1985Icar...61..224A, doi:10.1016/0019-1035(85)90104-6.
    10. Stern, S. Alan; Barker, Edwin S. (December 1992), "A CCD search for distant satellites of asteroids 3 Juno and 146 Lucina", In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991, pp. 577–581, Bibcode:1992acm..proc..577S.
    11. Kikwaya, J.-B.; et al. (March 2003), "Does 146 Lucina Have a Satellite? An Astrometric Approach", 34th Annual Lunar and Planetary Science Conference, March 17–21, 2003, League City, Texas, abstract no.1214, p. 1214, Bibcode:2003LPI....34.1214K.


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