| Discovery[1] | |
|---|---|
| Discovered by | W. Landgraf |
| Discovery site | La Silla Obs. |
| Discovery date | 5 June 1989 |
| Designations | |
| (4349) Tiburcio | |
Named after | Júlio Tibúrcio (Brazilian amateur astronomer)[2] |
| 1989 LX · 1931 AE 1951 YV1 · 1959 SS 1968 WD · 1982 BJ4 1984 MJ · 1986 AZ2 | |
| main-belt · (middle)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 86.31 yr (31,526 days) |
| Aphelion | 3.2534AU |
| Perihelion | 1.9884 AU |
| 2.6209 AU | |
| Eccentricity | 0.2413 |
| 4.24yr (1,550 days) | |
| 230.56° | |
| 0° 13m 56.28s / day | |
| Inclination | 10.740° |
| 90.259° | |
| 281.06° | |
| Physical characteristics | |
| Dimensions | 24.91±0.28 km[4] 26.12 km(derived)[3] 26.14±1.8 km(IRAS:4)[1] 26.397±0.117[5] 26.45±10.54 km[6] 28.091±0.371 km[7] 29.67±8.21 km[8] 30.23±7.05 km[9] |
| 16.284±0.003h[a] | |
| 0.0345±0.0053[7] 0.035±0.004[5] 0.040±0.041[6] 0.04±0.02[8] 0.04±0.01[9] 0.0493(derived)[3] 0.0540±0.008(IRAS:4)[1] 0.061±0.002[4] | |
| X[10] · S[3] | |
| 11.7[4][7][8] · 11.8[1][3] · 11.94±0.44[10] · 12.00[6] · 12.11[9] | |
4349 Tibúrcio, provisional designation1989 LX, is a darkasteroid from the central region of theasteroid belt, approximately 29 kilometers in diameter. It was discovered on 5 June 1989, by German astronomerWerner Landgraf atESO'sLa Silla Observatory in northern Chile.[11]
With 53.5°, it had been the asteroid with the smallest angular distance from the Sun ever discovered.[12]: 395 It was later named after Brazilian amateur astronomerJúlio Tibúrcio.[2]
Tibúrcio orbits the Sun in thecentral main-belt at a distance of 2.0–3.3 AU once every 4 years and 3 months (1,550 days). Its orbit has aneccentricity of 0.24 and aninclination of 11° with respect to theecliptic.[1]
One day before its first identification as1931 AE, aprecovery was taken atLowell Observatory in 1931, extending the body'sobservation arc by 58 years prior to its official discovery at La Silla.[11]
The asteroid has been characterized as anX-type asteroid byPan-STARRS' large-scale photometric survey.[10]
A rotationallightcurve ofTibúrcio was obtained from photometric observations by astronomerDavid Higgins at the Australian Hunters Hill Observatory (E14) in October 2010. Lightcurve analysis gave a well-definedrotation period of 16.284 hours with a brightness variation of 0.40magnitude (U=3).[a]
According to the space-based surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with itsNEOWISE mission,Tibúrcio measures between 24.9 and 30.23 kilometers in diameter, and its surface has a lowalbedo between 0.034 and 0.061.[1][4][5][6][7][8][9]
Collaborative Asteroid Lightcurve Link assumes an albedo of 0.049 and calculates a diameter of 26.1 kilometers with anabsolute magnitude of 11.8.[3]
Thisminor planet was named after Brazilianamateur astronomer and student of information science, Júlio César dos Santos Tibúrcio.[2] The official naming citation was published by theMinor Planet Center on 8 June 1990 (M.P.C. 16445).[13]
