19848 Yeungchuchiu

19848 Yeungchuchiu (prov. 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.[2][10]

19848 Yeungchuchiu
Yeungchuchiu modeled from its lightcurve
Discovery [1]
Discovered byW. K. Yeung
Discovery siteDesert Beaver Obs.
Discovery date2 October 2000
Designations
(19848) Yeungchuchiu
Named after
Chu Chiu Yeung
(discoverer's father)[2]
2000 TR · 1998 KR38
1999 SY6
main-belt · Eos [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc34.82 yr (12,718 days)
Aphelion3.2372 AU
Perihelion2.7768 AU
3.0070 AU
Eccentricity0.0766
5.21 yr (1,905 days)
94.290°
0° 11m 20.4s / day
Inclination11.061°
54.759°
350.16°
Physical characteristics
Mean diameter
11.69±0.55 km[4]
12.700±0.134[5]
12.90 km (calculated)[3]
13.242±0.282 km[6]
3.450±0.002 h[7]
3.4508±0.0003 h[8]
0.14 (assumed)[3]
0.170±0.020[4][5]
0.2107±0.0250[6]
S [3]
12.2[1][3][4] · 11.7[6] · 12.227±0.002 (R)[8] · 12.49±0.28[9]

    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.[1] 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.[10]

    Naming

    This minor planet was named by the discoverer after his father, Chu Chiu Yeung (born 1925), in gratitude for his unconditional support.[2] The approved naming citation was published by the Minor Planet Center on 9 March 2001 (M.P.C. 42368).[11]

    Physical characteristics

    Rotation period
    Lightcurve based 3D-model of Yeungchuchiu

    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).[7] 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.[7] 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).[8]

    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.[6][4] 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.[3]

    References
    1. "JPL Small-Body Database Browser: 19848 Yeungchuchiu (2000 TR)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 27 June 2017.
    2. 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.
    3. "LCDB Data for (19848) Yeungchuchiu". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 2016.
    4. 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.
    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. Retrieved 3 December 2016.
    6. 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.
    7. 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.
    8. 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.
    9. 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.
    10. "19848 Yeungchuchiu (2000 TR)". Minor Planet Center. Retrieved 1 January 2016.
    11. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.
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