21558 Alisonliu
| Discovery [1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | MRO |
| Discovery date | 24 August 1998 |
| Designations | |
| MPC designation | 21558 Alisonliu |
Named after |
Alison Lui (Winner 2006 ISEF)[2] |
| 1998 QW77 · 1992 CX | |
| main-belt · Eunomia [3] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 8707 days (23.84 yr) |
| Aphelion | 3.1119 AU (465.53 Gm) |
| Perihelion | 2.2375 AU (334.73 Gm) |
| 2.6747 AU (400.13 Gm) | |
| Eccentricity | 0.16347 |
| 4.37 yr (1597.7 d) | |
| 74.342° | |
| 0° 13m 31.152s / day | |
| Inclination | 11.958° |
| 323.47° | |
| 288.43° | |
| Earth MOID | 1.25579 AU (187.864 Gm) |
| Jupiter MOID | 2.11341 AU (316.162 Gm) |
| Jupiter Tisserand parameter | 3.329 |
| Physical characteristics | |
| Dimensions |
8.812±0.068 km[4] 8.36 km (calculated)[3] |
| 4.866 h[5] | |
|
0.2287±0.0326[4] 0.21 (assumed)[3] | |
| S [3] | |
| 12.7[1] | |
|
| |
21558 Alisonliu, provisional designation 1998 QW77, is a stony asteroid from the middle region of the asteroid belt, about 8 kilometers in diameter. It was discovered by the Lincoln Near-Earth Asteroid Research at the U.S. Magdalena Ridge Observatory in Socorro, New Mexico, on 24 August 1998.[6]
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 (1,598 days). Its orbit shows an eccentricity of 0.16 and is tilted by 12 degrees to the plane of the ecliptic. It has a rotation period of 4.9 hours[5] and an albedo of 0.23, according to the survey carried out by the space-based NEOWISE mission of the Wide-field Infrared Survey Explorer.[4]
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 for her behavioral and social science team project. She also 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]
References
- 1 2 3 "JPL Small-Body Database Browser: 21558 Alisonliu (1998 QW77)" (2015-11-21 last obs.). Jet Propulsion Laboratory. Retrieved 12 April 2016.
- 1 2 Schmadel, Lutz D. (2009). Dictionary of Minor Planet Names – Addendum to Fifth Edition: 2006 – 2008. Springer Berlin Heidelberg. p. 86. ISBN 978-3-642-01964-7. Retrieved December 2015.
- 1 2 3 4 "LCDB Data for (21558) Alisonliu". Asteroid Lightcurve Database (LCDB). Retrieved December 2015.
- 1 2 3 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. Retrieved December 2015.
- 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 December 2015.
- ↑ "21558 Alisonliu (1998 QW77)". Minor Planet Center. Retrieved December 2015.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (20001)-(25000) – Minor Planet Center
- 21558 Alisonliu at the JPL Small-Body Database
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