_Yeungchuchiu.png) Yeungchuchiu modeled from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | W. K. Yeung |
| Discovery site | Desert Beaver Obs. |
| Discovery date | 2 October 2000 |
| Designations | |
| MPC designation | (19848) Yeungchuchiu |
| Named after | Chu Chiu Yeung (discoverer's father) |
| Alternative designations | 2000 TR · 1998 KR38 1999 SY6 |
| Minor planet category | main-belt · Eos |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 34.82 yr (12,718 days) |
| Aphelion | 3.2372 AU |
| Perihelion | 2.7768 AU |
| Semi-major axis | 3.0070 AU |
| Eccentricity | 0.0766 |
| Orbital period (sidereal) | 5.21 yr (1,905 days) |
| Mean anomaly | 94.290° |
| Mean motion | 0° 11 20.4 / day |
| Inclination | 11.061° |
| Longitude of ascending node | 54.759° |
| Argument of perihelion | 350.16° |
| Physical characteristics | |
| Mean diameter | 11.69±0.55 km 12.700±0.134 12.90 km (calculated) 13.242±0.282 km |
| Synodic rotation period | 3.450±0.002 h 3.4508±0.0003 h |
| Geometric albedo | 0.14 (assumed) 0.170±0.020 0.2107±0.0250 |
| Spectral type | S |
| Absolute magnitude (H) | 12.2 · 11.7 · 12.227±0.002 (R) · 12.49±0.28 |
19848 Yeungchuchiu (provisional designation 2000 TR) is a stony Eos asteroid from the outer region of the asteroid belt, approximately 12 kilometers (7.5 miles) in diameter. It was discovered on 2 October 2000 by Canadian amateur astronomer William Yeung at the Desert Beaver Observatory in Arizona, United States. It is the largest object found by the discoverer, just 1°.2 west of Jupiter, who named it after his father, Chu Chiu Yeung.
Orbit and classification
Yeungchuchiu is a member of the Eos family, an orbital group of more than 4,000 asteroids, which are known for mostly being of stony composition. It orbits the Sun in the outer main-belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,905 days). Its orbit has an eccentricity of 0.08 and an inclination of 11° with respect to the ecliptic. The first precovery was taken at the Australian Siding Spring Observatory in 1982, extending the asteroid's observation arc by 18 years prior to its discovery.
Naming
This minor planet was named by the discoverer after his father, Chu Chiu Yeung (born 1925), in gratitude for his unconditional support. The approved naming citation was published by the Minor Planet Center on 9 March 2001 (M.P.C. 42368).
Physical characteristics
Rotation period
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In November 2005, a rotational lightcurve of Yeungchuchiu was obtained from photometric observations by the discoverer at the Desert Eagle Observatory in Arizona. Lightcurve analysis gave a well-defined rotation period of 3.450 hours with a brightness variation of 0.70 magnitude (U=3). The large amplitude suggests that the body is of non-spherical shape and that the long axis is almost twice as long as the short axis. It is likely that the rotational axis was almost perpendicular to the observation's line-of-sight. A second lightcurve was obtained at the Palomar Transient Factory in September 2010, and gave a concurring period of 3.4508±0.0003 hours with an amplitude of 0.63 in magnitude (U=2).
Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, the asteroid measures 11.7 and 13.2 kilometers in diameter with an albedo for its surface of 0.17 and 0.21, respectively. The Collaborative Asteroid Lightcurve Link assumes an albedo for stony asteroids of 0.21 and calculates a diameter of 12.9 kilometers with an absolute magnitude of 12.2.
References
- ^ "JPL Small-Body Database Browser: 19848 Yeungchuchiu (2000 TR)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 27 June 2017.
- ^ Schmadel, Lutz D. (2007). "(19848) Yeungchuchiu". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 859. doi:10.1007/978-3-540-29925-7_9589. ISBN 978-3-540-00238-3.
- ^ "LCDB Data for (19848) Yeungchuchiu". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 2016.
- ^ Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 17 May 2016.
- ^ 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. Retrieved 3 December 2016.
- ^ 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 17 May 2016.
- ^ Yeung, Kwong W. (September 2006). "Lightcurve analysis for 19848 Yeungchuchiu". The Minor Planet Bulletin. 33 (3): 49. Bibcode:2006MPBu...33...49Y. ISSN 1052-8091. Retrieved 17 May 2016.
- ^ 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. Retrieved 17 May 2016.
- 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 17 May 2016.
- ^ "19848 Yeungchuchiu (2000 TR)". Minor Planet Center. Retrieved 1 January 2016.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.
External links
- Lightcurve Database Query (LCDB), at www.minorplanet.info
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center
- 19848 Yeungchuchiu at AstDyS-2, Asteroids—Dynamic Site
- 19848 Yeungchuchiu at the JPL Small-Body Database
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