2169 Taiwan
Astridian asteroid
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2169 Taiwan, provisional designation 1964 VP1, is a carbonaceous Astridian asteroid from the central regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 9 November 1964, by astronomers at the Purple Mountain Observatory near Nanking, China.[13] It was named for Taiwan.[2]
| Discovery[1] | |
|---|---|
| Discovered by | Purple Mountain Obs. |
| Discovery site | Purple Mountain Obs. |
| Discovery date | 9 November 1964 |
| Designations | |
Named after | Taiwan[2] |
| 1964 VP1 · 1938 DV1 1975 BH1 · 1977 RF8 1979 FG | |
| main-belt · (middle)[3] Astrid[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 79.28 yr (28,957 days) |
| Aphelion | 2.9244 AU |
| Perihelion | 2.6564 AU |
| 2.7904 AU | |
| Eccentricity | 0.0480 |
| 4.66 yr (1,703 days) | |
| 116.98° | |
| 0° 12m 41.4s / day | |
| Inclination | 1.5286° |
| 71.855° | |
| 358.45° | |
| Physical characteristics | |
| Dimensions | 14.39 km (calculated)[3] 16.52±4.57 km[5] 17.96±4.92 km[6] 18.22±0.51 km[7] 18.39±0.30 km[8] 19.263±0.139 km[9][10] |
| 7.252±0.0014 h[11] | |
| 0.042±0.006[9] 0.0423±0.0059[10] 0.05±0.06[5] 0.05±0.07[6] 0.057 (assumed)[3] 0.057±0.015[8] 0.085±0.005[7] | |
| SMASS = C[1] · C[3][12] | |
| 12.00[7] · 12.40[8] · 12.488±0.003 (R)[11] · 12.50[6][10] · 12.59±0.32[12] · 12.6[1] · 12.69[5] · 12.94[3] | |
Orbit and classification
Taiwan is a member of the Astrid family (515), a smaller asteroid family of nearly 500 carbonaceous asteroids. The family is located in the outermost central main-belt, near a prominent Kirkwood gap, that marks the 5:2 orbital resonance with Jupiter, and divides the asteroid belt into a central and outer part.[4][14][15]: 23
Taiwan orbits the Sun at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,703 days). Its orbit has an eccentricity of 0.05 and an inclination of 2° with respect to the ecliptic.[1]
The body's observation arc begins with its first identification as 1938 DV1 at Heidelberg Observatory in February 1938, almost 27 years prior to its official discovery observation at Nanking.[13]
Physical characteristics
In the SMASS classification, and according to PanSTARRS photometric survey, Taiwan is a carbonaceous C-type asteroid.[1][12]
Rotation period
In September 2010, a rotational lightcurve of Taiwan was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 7.252 hours with a brightness variation of 0.17 magnitude (U=2).[11]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Taiwan measures between 16.52 and 19.263 kilometers in diameter and its surface has an albedo between 0.042 and 0.085.[5][6][7][8][9][10]
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 14.39 kilometers based on an absolute magnitude of 12.94.[3]
Naming
This minor planet was named after the Taiwan Province.[2] The official naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5184).[16]
