2169 Taiwan
Discovery [1]
Discovered byPurple Mountain Obs.
Discovery sitePurple Mountain Obs.
Discovery date9 November 1964
Designations
(2169) Taiwan
Named after
Taiwan
(Island of 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 arc79.28 yr (28,957 days)
Aphelion2.9244 AU
Perihelion2.6564 AU
2.7904 AU
Eccentricity0.0480
4.66 yr (1,703 days)
116.98°
0° 12m 41.4s / day
Inclination1.5286°
71.855°
358.45°
Physical characteristics
Dimensions14.39 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]

    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]

    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 Island of Taiwan (former Formosa). Taiwan, or the Republic of China, is a country southeast of mainland China.[2] The official naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5184).[16]

    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 2169 Taiwan (1964 VP1)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 4 September 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(2169) Taiwan". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 176. doi:10.1007/978-3-540-29925-7_2170. ISBN 978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (2169) Taiwan". Asteroid Lightcurve Database (LCDB). Retrieved 4 September 2017.
    4. 1 2 "Asteroid 2169 Taiwan – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
    6. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 4 September 2017.
    7. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    8. 1 2 3 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 4 September 2017.
    9. 1 2 3 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 4 September 2017.
    10. 1 2 3 4 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.
    11. 1 2 3 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 4 September 2017.
    12. 1 2 3 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 4 September 2017.
    13. 1 2 "2169 Taiwan (1964 VP1)". Minor Planet Center. Retrieved 4 September 2017.
    14. ↑ Vokrouhlický, D.; Broz, M.; Bottke, W. F.; Nesvorný, D.; Morbidelli, A. (May 2006). "Yarkovsky/YORP chronology of asteroid families" (PDF). Icarus. 182 (1): 118–142. Bibcode:2006Icar..182..118V. doi:10.1016/j.icarus.2005.12.010. Retrieved 4 September 2017.
    15. ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 978-0-8165-3213-1.
    16. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 September 2017.
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