4349 Tibúrcio

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
(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 arc86.31 yr (31,526 days)
Aphelion3.2534 AU
Perihelion1.9884 AU
2.6209 AU
Eccentricity0.2413
4.24 yr (1,550 days)
230.56°
0° 13m 56.28s / day
Inclination10.740°
90.259°
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]
16.284±0.003 h[lower-alpha 1]
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]

    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)
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    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. Retrieved 17 October 2019. (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.

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