146 Lucina
Main-belt asteroid
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146 Lucina is a main-belt asteroid that was discovered by Alphonse Borrelly on June 8, 1875. It was named after Lucina, the Roman goddess of childbirth. This asteroid is large, dark and has a carbonaceous composition. The spectra of the asteroid displays evidence of aqueous alteration.[7]
Lightcurve-base 3D-model of Lucina on the top with an image of the asteroid on the bottom. | |
| Discovery[1] | |
|---|---|
| Discovered by | Alphonse Borrelly |
| Discovery date | 8 June 1875 |
| Designations | |
| (146) Lucina | |
| Pronunciation | /luËËsaɪnÉ/[2] or as Latin LÅ«cÄ«na[3] |
| A875 LC; 1950 CY | |
| Main belt | |
| Orbital characteristics[4][5] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 130.35 yr (47610 d) |
| Aphelion | 2.89945 AU (433.752 Gm) |
| Perihelion | 2.53641 AU (379.442 Gm) |
| 2.71793 AU (406.597 Gm) | |
| Eccentricity | 0.066786 |
| 4.48 yr (1636.6 d) | |
Average orbital speed | 18.04 km/s |
| 198.102° | |
| 0° 13m 11.863s / day | |
| Inclination | 13.0947° |
| 83.9692° | |
| 146.982° | |
| Earth MOID | 1.53233 AU (229.233 Gm) |
| Jupiter MOID | 2.14062 AU (320.232 Gm) |
| TJupiter | 3.319 |
| Physical characteristics | |
| Dimensions | 160.31 km[5] 131.893 km[6] |
| Mass | 2.4Ã1018 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] | |
This body is orbiting the Sun at a distance of 2.72 AU with a low eccentricity of 0.07 and an orbital period of 4.48 years. The orbital plane is inclined at an angle of 13.1° to the plane of the ecliptic. 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]
