21558 Alisonliu

21558 Alisonliu, provisional designation 1998 QW77, is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 24 August 1998, by the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, United States.[8] The asteroid was named for Alison Liu, a 2006 ISEF awardee.[2]

21558 Alisonliu
Discovery [1]
Discovered byLINEAR
Discovery siteLincoln Laboratory ETS
Discovery date24 August 1998
Designations
(21558) Alisonliu
Named after
Alison W. Lui
(2006 ISEF awardee)[2]
1998 QW77 · 1992 CX
main-belt · Eunomia [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc25.04 yr (9,147 days)
Aphelion3.1122 AU
Perihelion2.2357 AU
2.6740 AU
Eccentricity0.1639
4.37 yr (1,597 days)
209.51°
0° 13m 31.44s / day
Inclination11.958°
323.45°
288.46°
Physical characteristics
Dimensions6.670±0.581 km[4]
8.36 km (calculated)[3]
8.812±0.068 km[5]
4.866±0.003 h[6]
0.21 (assumed)[3]
0.2287±0.0326[5]
0.245±0.050[4]
S [3][7]
12.5[5] · 12.7[1][3] · 12.83±0.25[7]

    Orbit and classification

    Alisonliu is a member of the Eunomia family, a large group of stony asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun in the central main-belt at a distance of 2.2–3.1 AU once every 4 years and 4 months (1,597 days). Its orbit has an eccentricity of 0.16 and an inclination of 12° with respect to the ecliptic.[1]

    The body's observation arc begins 6 years prior to its official discovery observation, with its first identification as 1992 CX at the Venezuelan OAN de Llano del Hato in 1992.[8]

    Physical characteristics

    Alisonliu has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey.[7]

    Lightcurve

    A rotational lightcurve of Alisonliu was obtained from photometric observations made at the Australian Oakley Southern Sky Observatory (E09) in April 2010. Lightcurve analysis gave a well-defined rotation period of 4.866 hours with a brightness variation of 0.12 magnitude (U=3).[6]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Alisonliu measures 6.7 and 8.8 kilometers in diameter, and its surface has an albedo of 0.229 and 0.245, respectively,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 and calculates a diameter of 8.4 kilometers with an absolute magnitude of 12.7.[3]

    Naming

    This minor planet was named after Alison Liu (born 1989) who was awarded Intel Best of Category in the 2006 Intel International Science and Engineering Fair (ISEF) for her behavioral and social science team project. In addition, she received the EU Contest for Young Scientists Award. At the time, Liu attended the Manhasset Secondary School in the U.S. state of New York.[2] The approved naming citation was published by the Minor Planet Center on 11 July 2006 (M.P.C. 57276).[9]

    References
    1. "JPL Small-Body Database Browser: 21558 Alisonliu (1998 QW77)" (2017-02-21 last obs.). Jet Propulsion Laboratory. Retrieved 27 June 2017.
    2. Schmadel, Lutz D. (2009). Dictionary of Minor Planet Names – (21558) Alisonliu, Addendum to Fifth Edition: 2006 – 2008. Springer Berlin Heidelberg. p. 86. ISBN 978-3-642-01964-7. Retrieved 12 May 2016.
    3. "LCDB Data for (21558) Alisonliu". Asteroid Lightcurve Database (LCDB). Retrieved 12 May 2016.
    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. S2CID 119293330. Retrieved 3 December 2016.
    5. 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. S2CID 118700974. Retrieved 12 May 2016.
    6. Albers, Kenda; Kragh, Katherine; Monnier, Adam; Pligge, Zachary; Stolze, Kellen; West, Josh; et al. (October 2010). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2009 October thru 2010 April". The Minor Planet Bulletin. 37 (4): 152–158. Bibcode:2010MPBu...37..152A. ISSN 1052-8091. Retrieved 20 December 2015.
    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. S2CID 53493339. Retrieved 12 May 2016.
    8. "21558 Alisonliu (1998 QW77)". Minor Planet Center. Retrieved 12 May 2016.
    9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 May 2016.

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