21558 Alisonliu

21558 Alisonliu
Discovery [1]
Discovered by LINEAR
Discovery site Lincoln Laboratory ETS
Discovery date 24 August 1998
Designations
MPC designation 21558 Alisonliu
Named after
 Alison W. Lui
(awardee 2006 ISEF)[2]
1998 QW77 · 1992 CX
main-belt · Eunomia [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 24.76 yr (9,044 days)
Aphelion 3.1122 AU
Perihelion 2.2365 AU
2.6744 AU
Eccentricity 0.1637
4.37 yr (1,597 days)
164.46°
0° 13m 31.44s / day
Inclination 11.957°
323.46°
288.43°
Physical characteristics
Dimensions 6.670±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]

    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 by the Lincoln Near-Earth Asteroid Research at the U.S. Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, on 24 August 1998.[8]

    The asteroid is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun 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 first precovery was taken at the Venezuelan OAN de Llano del Hato in 1992, extending the asteroid's observation arc by 6 years prior to its discovery.[8]

    A rotational light-curve of this asteroid was obtained from photometric observations made at the Australian Oakley Southern Sky Observatory (E09) in April 2010. The light-curve gave a well-defined rotation period of 4.866±0.003 hours with a brightness amplitude of 0.12 in magnitude (U=3).[6] 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, based on an absolute magnitude of 12.7.[3]

    The minor planet was named after Alison Liu (b. 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] Naming citation was published on 11 July 2006 (M.P.C. 57276).[9]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 21558 Alisonliu (1998 QW77)" (2016-11-10 last obs.). Jet Propulsion Laboratory. Retrieved 3 December 2016.
    2. 1 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. 1 2 3 4 5 6 "LCDB Data for (21558) Alisonliu". Asteroid Lightcurve Database (LCDB). Retrieved 12 May 2016.
    4. 1 2 3 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 3 December 2016.
    5. 1 2 3 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 12 May 2016.
    6. 1 2 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. 1 2 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 12 May 2016.
    8. 1 2 "21558 Alisonliu (1998 QW77)". Minor Planet Center. Retrieved 12 May 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 May 2016.

    External links

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