31641 Cevasco

31641 Cevasco, provisional designation 1999 GW34, is a stony Nysian asteroid from the inner regions of the asteroid belt, approximately 3.3 kilometers in diameter. It was discovered on 6 April 1999, by the Lincoln Near-Earth Asteroid Research project at Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, United States. The asteroid was named for Hannah Cevasco, a 2015 Broadcom MASTERS awardee.[2]

31641 Cevasco
Discovery [1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date6 April 1999
Designations
(31641) Cevasco
Named after
Hannah Olivia Cevasco
(Broadcom MASTERS awardee)[2]
1999 GW34 · 1993 RR14
main-belt · (inner) [3]
Nysa
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc23.42 yr (8,554 days)
Aphelion2.7515 AU
Perihelion2.1234 AU
2.4374 AU
Eccentricity0.1289
3.81 yr (1,390 days)
347.07°
Inclination1.2136°
278.36°
215.87°
Physical characteristics
Dimensions2.737±0.168[4][5]
3.26 km (calculated)[3]
2.6556±0.1936 h[3]
2.8167±0.0127 h[6]
2.820±0.010 h[7]
0.20 (assumed)[3]
0.3108±0.0672[4]
0.311±0.067[5]
S [3]
14.8[1][3] · 14.940[7]

    Orbit and classification

    Cevasco orbits the Sun in the inner main-belt at a distance of 2.1–2.8 AU once every 3 years and 10 months (1,390 days). Its orbit has an eccentricity of 0.13 and an inclination of 1° with respect to the ecliptic.[1]

    The asteroid's observation arc begins 6 years prior to its official discovery observation, with its first identification as 1993 RR14 at ESO's La Silla Observatory in 1993.[2]

    Physical characteristics

    Lightcurves

    Three rotational lightcurves of Cevasco were obtained from photometric observations at the Palomar Transient Factory between 2010 and 2014. Lightcurve analysis gave a rotation period of 2.6556, 2.8167 and 2.820 hours with a brightness variation of 0.71, 0.48 and 0.54 magnitude, respectively (U=2/2/2).[6][7]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Cevasco measures 2.7 kilometers in diameter and its surface has an albedo of 0.311,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 3.3 kilometers with an absolute magnitude of 14.8.[3]

    Naming

    This minor planet was named in honor of Hannah Olivia Cevasco (born 2000) finalist in the 2015 Broadcom MASTERS, a math and science competition for middle school students, for her medicine and health sciences project. At the time she attended the St. Charles School in California.[2]

    References
    1. "JPL Small-Body Database Browser: 31641 Cevasco (1999 GW34)" (2017-02-15 last obs.). Jet Propulsion Laboratory. Retrieved 27 June 2017.
    2. "31641 Cevasco (1999 GW34)". Minor Planet Center. Retrieved 27 January 2016.
    3. "LCDB Data for (31641) Cevasco". Asteroid Lightcurve Database (LCDB). Retrieved 27 January 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.
    6. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75.
    7. Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27.

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