19848 Yeungchuchiu
Main-belt asteroid
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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.[2][10]
_Yeungchuchiu.png)
Yeungchuchiu modeled from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | W. K. Yeung |
| Discovery site | Desert Beaver Obs. |
| Discovery date | 2 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 arc | 34.82 yr (12,718 days) |
| Aphelion | 3.2372 AU |
| Perihelion | 2.7768 AU |
| 3.0070 AU | |
| Eccentricity | 0.0766 |
| 5.21 yr (1,905 days) | |
| 94.290° | |
| 0° 11m 20.4s / day | |
| Inclination | 11.061° |
| 54.759° | |
| 350.16° | |
| Physical characteristics | |
| 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
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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).[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]
