5088 Tancredi

5088 Tancredi, provisional designation 1979 QZ1, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 22 August 1979, by Swedish astronomer Claes-Ingvar Lagerkvist at ESO's La Silla Observatory in northern Chile.[7] It is named after Uruguayan astronomer Gonzalo Tancredi.[2]

5088 Tancredi
Discovery [1]
Discovered byC.-I. Lagerkvist
Discovery siteLa Silla Obs.
Discovery date22 August 1979
Designations
(5088) Tancredi
Named after
Gonzalo Tancredi
(Uruguayan astronomer)[2]
1979 QZ1 · 1982 DP6
1985 RS3
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc37.60 yr (13,733 days)
Aphelion3.5929 AU
Perihelion2.6160 AU
3.1045 AU
Eccentricity0.1573
5.47 yr (1,998 days)
225.83°
0° 10m 48.72s / day
Inclination0.5844°
5.7375°
84.766°
Physical characteristics
Dimensions12.81 km (derived)[3]
15.939±0.137 km[4][5]
5.0591±0.0001 h[6]
0.0695±0.0122[4][5]
0.08 (assumed)[3]
C [3][6]
12.36±0.07 (S)[6] · 12.5[1][4][5] · 12.81[3]

    Orbit and classification

    Tancredi is a dark C-type asteroid and member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.6–3.6 AU once every 5 years and 6 months (1,998 days). Its orbit has an eccentricity of 0.16 and an inclination of 1° with respect to the ecliptic.[1] As no precoveries were taken, the asteroid's observation arc begins with its discovery observation in 1979.[7]

    Lightcurve

    In February 2009, a rotational lightcurve of Tancredi was obtained from photometric observations by Gonzalo Tancredi at the Los Molinos Observatory near Montevideo, Uruguay. It gave a rotation period of 5.0591±0.0001 hours with a brightness amplitude of 0.31 magnitude (U=3-).[6]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Tancredi measures 15.9 kilometers in diameter and its surface has an albedo of 0.07,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 12.8 kilometers using an absolute magnitude of 12.81.[3]

    Naming

    This minor planet was named after Gonzalo Tancredi (born 1963), the Uruguayan astronomer who also obtained the body's first rotational lightcurve. In 1993 he did his PhD at Uppsala Observatory, Sweden, and is now a professor of astronomy at Uruguay University and an active member of the IAU.[8][9]

    Tancredi was also a director of the Los Molinos Observatory (2004–2012).[9] Using both observations and theoretical modeling, he works on the dynamical and physical evolution of comets and their interactions with minor planets in the Solar System.[2] The approved naming citation was published by the Minor Planet Center on 1 September 1993 (M.P.C. 22506).[10]

    References
    1. "JPL Small-Body Database Browser: 5088 Tancredi (1979 QZ1)" (2017-03-28 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
    2. Schmadel, Lutz D. (2007). "(5088) Tancredi". Dictionary of Minor Planet Names – (5088) Tancredi. Springer Berlin Heidelberg. pp. 437–438. doi:10.1007/978-3-540-29925-7_4947. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (5088) Tancredi". Asteroid Lightcurve Database (LCDB). Retrieved 10 September 2016.
    4. 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.
    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 10 September 2016.
    6. Tancredi, Gonzalo; Bruzzone, Sebastián; Santiago, Roland; Salvo, Raúl; Martínez, Mariana (January 2012). "5088 Tancredi: Rotation Period and Phase Coefficients". The Minor Planet Bulletin. 39 (1): 14–15. Bibcode:2012MPBu...39...14T. ISSN 1052-8091. Retrieved 10 September 2016.
    7. "5088 Tancredi (1979 QZ1)". Minor Planet Center. Retrieved 10 September 2016.
    8. "Individual Members—Gonzalo Tancredi". IAU—International Astronomical Union. 20 March 2014. Retrieved 10 September 2016.
    9. "Curriculum Vitae – Gonzalo Tancredi". IFFC Instituto de Física Facultad de Ciencias. Retrieved 10 September 2016.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 September 2016.
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