2033 Basilea

2033 Basilea, provisional designation 1973 CA, is a stony asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 6 February 1973, by astronomer Paul Wild at the Zimmerwald Observatory near Bern, Switzerland.[8] The asteroid was named for the Swiss city of Basel.[2]

2033 Basilea
Discovery [1]
Discovered byP. Wild
Discovery siteZimmerwald Obs.
Discovery date6 February 1973
Designations
(2033) Basilea
Named after
Basel (Swiss city)[2]
1973 CA · 1953 DA
1953 EY · 1955 WD
1955 XD
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.33 yr (23,133 days)
Aphelion2.4734 AU
Perihelion1.9765 AU
2.2250 AU
Eccentricity0.1117
3.32 yr (1,212 days)
191.60°
0° 17m 49.2s / day
Inclination8.4634°
321.72°
134.56°
Physical characteristics
Dimensions5.710±0.088 km[4]
6.25±1.51 km[5]
6.322±0.051 km[6]
7.82 km (calculated)[3]
6.5287±0.0002 h[lower-alpha 1]
0.20 (assumed)[3]
0.29±0.13[5]
0.3688±0.0966[6]
0.419±0.088[4]
S [3]
12.7[6] · 12.9[1][3] · 13.01±0.09[7] · 13.19[5]

    Classification and orbit

    Basilea orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,212 days). Its orbit has an eccentricity of 0.11 and an inclination of 8° with respect to the ecliptic.[1]

    The asteroid was first identified as 1953 DA at Goethe Link Observatory in February 1953, extending the body's observation arc by 20 years prior to its official discovery observation at Zimmerwakd.[8]

    Physical characteristics

    Lightcurves

    In December 2015, a rotational lightcurve of Basilea was obtained from photometric observations by astronomers Petr Pravec, Peter Kušnirák and Donald Pray. Lightcurve analysis gave a rotation period of 6.5287 hours with a brightness variation of 0.28 magnitude (U=3-).[lower-alpha 1]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Basilea measures between 5.710 and 6.322 kilometers in diameter and its surface has an albedo between 0.29 and 0.419.[4][5][6]

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.82 kilometers based on an absolute magnitude of 12.9.[3]

    Naming

    This minor planet was named for the Swiss city of Basel, as well as for the Astronomical Institute of the University of Basel on the occasion of its 50th anniversary.[2] The approved naming citation was published by the Minor Planet Center on 1 June 1980 (M.P.C. 5359).[9]

    Notes
    1. Pravec (2015) web: lightcurve plot of (2033) Basilea with a rotation period 6.5287±0.0002 hours with a brightness amplitude of 0.28 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) and Ondrejov Asteroid Photometry Project, also see data sheet.

    References
    1. "JPL Small-Body Database Browser: 2033 Basilea (1973 CA)" (2016-06-21 last obs.). Jet Propulsion Laboratory. Retrieved 3 July 2017.
    2. Schmadel, Lutz D. (2007). "(2033) Basilea". Dictionary of Minor Planet Names – (2033) Basilea. Springer Berlin Heidelberg. p. 165. doi:10.1007/978-3-540-29925-7_2034. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2033) Basilea". Asteroid Lightcurve Database (LCDB). Retrieved 3 July 2017.
    4. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 3 July 2017.
    5. 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 3 July 2017.
    6. 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.
    7. 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 July 2017.
    8. "2033 Basilea (1973 CA)". Minor Planet Center. Retrieved 3 July 2017.
    9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 July 2017.

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