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4349 Tibúrcio, provisional designation 1989 LX, is a dark asteroid from the central region of the asteroid belt, approximately 29 kilometers in diameter. It was discovered on 5 June 1989, by German astronomer Werner Landgraf at ESO's La Silla Observatory in northern Chile.[11]

4349 Tibúrcio
Discovery [1]
Discovered byW. Landgraf
Discovery siteLa Silla Obs.
Discovery date5 June 1989
Designations
MPC designation
(4349) Tiburcio
Named after
Júlio Tibúrcio
(Brazilian amateur astronomer)[2]
Alternative designations
1989 LX · 1931 AE
1951 YV1 · 1959 SS
1968 WD · 1982 BJ4
1984 MJ · 1986 AZ2
Minor planet category
main-belt · (middle) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.31 yr (31,526 days)
Aphelion3.2534 AU
Perihelion1.9884 AU
Semi-major axis
2.6209 AU
Eccentricity0.2413
Orbital period (sidereal)
4.24 yr (1,550 days)
Mean anomaly
230.56°
Mean motion
0° 13m 56.28s / day
Inclination10.740°
Longitude of ascending node
90.259°
Argument of perihelion
281.06°
Physical characteristics
Dimensions24.91±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]
Synodic rotation period
16.284±0.003 h[lower-alpha 1]
Geometric albedo
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]
Spectral type
X [10] · S [3]
Absolute magnitude (H)
11.7[4][7][8] · 11.8[1][3] · 11.94±0.44[10] · 12.00[6] · 12.11[9]

    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 astronomer Júlio Tibúrcio.[2]


    Orbit and classification


    Tibúrcio orbits the Sun in the central main-belt at a distance of 2.0–3.3 AU once every 4 years and 3 months (1,550 days). Its orbit has an eccentricity of 0.24 and an inclination of 11° with respect to the ecliptic.[1]

    One day before its first identification as 1931 AE, a precovery was taken at Lowell Observatory in 1931, extending the body's observation arc by 58 years prior to its official discovery at La Silla.[11]


    Physical characteristics


    The asteroid has been characterized as an X-type asteroid by Pan-STARRS' large-scale photometric survey.[10]


    Rotation period


    A rotational lightcurve of Tibúrcio was obtained from photometric observations by astronomer David Higgins at the Australian Hunters Hill Observatory (E14) in October 2010. Lightcurve analysis gave a well-defined rotation period of 16.284 hours with a brightness variation of 0.40 magnitude (U=3).[lower-alpha 1]


    Diameter and albedo


    According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its NEOWISE mission, Tibúrcio measures between 24.9 and 30.23 kilometers in diameter, and its surface has a low albedo 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 an absolute magnitude of 11.8.[3]


    Naming


    This minor planet was named after Brazilian amateur astronomer and student of information science, Júlio César dos Santos Tibúrcio.[2] The official naming citation was published by the Minor Planet Center on 8 June 1990 (M.P.C. 16445).[13]


    Notes


    1. Higgins (2011) web: rotation period 16.284±0.003 hours with a brightness amplitude of 0.40 mag. Quality Code (U) of 3 (Denotes a secure result within the precision given and no ambiguity.). Summary figures for (4349) Tiburcio at Collaborative Asteroid Lightcurve Link (CALL)

    References


    1. "JPL Small-Body Database Browser: 4349 Tiburcio (1989 LX)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2017.
    2. Schmadel, Lutz D. (2007). "(4349) Tibúrcio". Dictionary of Minor Planet Names – (4349) Tibúrcio. Springer Berlin Heidelberg. p. 373. doi:10.1007/978-3-540-29925-7_4301. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (4349) Tiburcio". Asteroid Lightcurve Database (LCDB). Retrieved 3 August 2016.
    4. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 5 December 2016.
    6. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 3 August 2016.
    7. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 3 August 2016.
    8. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 20 June 2017.
    9. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 20 June 2017.
    10. Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 3 August 2016.
    11. "4349 Tiburcio (1989 LX)". Minor Planet Center. Retrieved 3 August 2016.
    12. Marsden, B. G. (December 1993). "Asteroid and Comet Surveys". Astronomy from Wide-field Imaging: Proceedings of the 161st Symposium of the International Astronomical Union. 161: 385. Bibcode:1994IAUS..161..385M. Retrieved 3 January 2016.
    13. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 August 2016.



    На других языках

    [de] (4349) Tibúrcio

    (4349) Tibúrcio ist ein Asteroid (Planetoid), der in der bisher geringsten Winkeldistanz zur Sonne entdeckt wurde (53,5 Grad). Er kann in günstigen Oppositionen 13. Größe erreichen und hat etwa 26 km Durchmesser.
    - [en] 4349 Tibúrcio

    [es] (4349) Tibúrcio

    (4349) Tibúrcio es un asteroide perteneciente al cinturón de asteroides descubierto por Werner Landgraf desde el Observatorio de La Silla, Chile, el 5 de junio de 1989.


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