_Libera.png) Modelled shape ofLibera from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | J. Rheden |
| Discovery site | Vienna Observatory |
| Discovery date | 21 November 1913 |
| Designations | |
| (771) Libera | |
| Pronunciation | Classically/ˈlɪbərə/[2] |
Named after | friend of discoverer[3] |
| 1913 TO · 1958 HA | |
| main-belt · (middle)[4] | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 101.75 yr (37166 d) |
| Aphelion | 3.3092 AU (495.05 Gm) |
| Perihelion | 1.9937 AU (298.25 Gm) |
| 2.6514 AU (396.64 Gm) | |
| Eccentricity | 0.24808 |
| 4.32yr (1576.9d) | |
| 268.14° | |
| 0° 13m 41.844s / day | |
| Inclination | 14.936° |
| 218.19° | |
| 227.36° | |
| Earth MOID | 1.03684 AU (155.109 Gm) |
| Jupiter MOID | 2.11238 AU (316.008 Gm) |
| TJupiter | 3.299 |
| Physical characteristics | |
| Dimensions | 29.38±1.1 km(IRAS:6)[1][5] 28.91±0.72 km[6] 29.000±1.403 km[7] 29.33 km(derived)[4] |
| 14.69±0.55km | |
| 5.892±0.002h[8] 5.92 h[9] 5.886±0.001 h[10] 5.89±0.05 h[10] 5.890±0.001 h[11] 5.892 h (0.2455 d)[1] | |
| 0.1303±0.010(IRAS:6)[1][5] 0.141±0.008[6] 0.1299±0.0158[7] 0.1226(SIMPS)[4] | |
| B–V = 0.687 U–B = 0.300 X(Tholen),X(SMASS),X[4] | |
| 10.49[1] | |
771 Libera, provisional designation 1913 TO, is a metallicasteroid from the middle region of theasteroid belt, about 29 kilometers in diameter. It was discovered by Austrian astronomerJoseph Rheden at theVienna Observatory in Austria, on 21 November 1913.[12]
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The metallicX-type asteroid orbits the Sun at a distance of 2.0–3.3 AU once every 4 years and 4 months (1,576 days). Its orbit shows aneccentricity of 0.25 and istilted by 15 degrees to the plane of theecliptic. Aphotometric observation of the asteroid'slight-curve performed at the Palmer Divide Observatory during 1999 rendered arotation period of5.892±0.002 hours with a brightness variation of 0.57magnitude.[8] The result concurs with several previous observations, including a photometric analysis conducted over a twelve-year interval.[9][10][11]
According to the surveys carried out by the Infrared Astronomical Satellite,IRAS, the JapaneseAkari satellite, and the U.S.Wide-field Infrared Survey Explorer with its subsequentNEOWISE mission, the asteroid's surface has analbedo of 0.13 and 0.14, respectively, while the Collaborative Asteroid Lightcurve Link publishes a slightly lower figure of 0.12 from an alternative result of the Supplemental IRAS Minor Planet Survey.[4]
The minor planet was named by Mrs. Hedwig Rheden in honor of a friend of the discoverer.[3]
