Astronomy:2169 Taiwan

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2169 Taiwan
Discovery [1]
Discovered byPurple Mountain Obs.
Discovery sitePurple Mountain Obs.
Discovery date9 November 1964
Designations
(2169) Taiwan
Named afterTaiwan
(Island of Taiwan)[2]
1964 VP1 · 1938 DV1
1975 BH1 · 1977 RF8
1979 FG
Minor planet categorymain-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)
|{{{apsis}}}|helion}}2.9244 AU
|{{{apsis}}}|helion}}2.6564 AU
2.7904 AU
Eccentricity0.0480
Orbital period4.66 yr (1,703 days)
Mean anomaly116.98°
Mean motion0° 12m 41.4s / day
Inclination1.5286°
Longitude of ascending node71.855°
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]
Rotation period7.252±0.0014 h[11]
Geometric albedo0.042±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]
Absolute magnitude (H)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 ({{{1}}}).[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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "JPL Small-Body Database Browser: 2169 Taiwan (1964 VP1)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002169. 
  2. ↑ 2.0 2.1 2.2 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. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (2169) Taiwan". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2169%7CTaiwan. 
  4. ↑ 4.0 4.1 "Asteroid 2169 Taiwan – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2169+Taiwan#Asteroid%202169%20TaiwanEAR-A-VARGBDET-5-NESVORNYFAM-V3.0. 
  5. ↑ 5.0 5.1 5.2 5.3 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. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N. 
  6. ↑ 6.0 6.1 6.2 6.3 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. doi:10.1088/0004-637X/814/2/117. Bibcode: 2015ApJ...814..117N. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N. Retrieved 4 September 2017. 
  7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 4 September 2017. 
  9. ↑ 9.0 9.1 9.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 4 September 2017. 
  10. ↑ 10.0 10.1 10.2 10.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  11. ↑ 11.0 11.1 11.2 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. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 4 September 2017. 
  12. ↑ 12.0 12.1 12.2 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 4 September 2017. 
  13. ↑ 13.0 13.1 "2169 Taiwan (1964 VP1)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2169. 
  14. ↑ Vokrouhlický, D.; Broz, M.; Bottke, W. F.; Nesvorný, D.; Morbidelli, A. (May 2006). "Yarkovsky/YORP chronology of asteroid families". Icarus 182 (1): 118–142. doi:10.1016/j.icarus.2005.12.010. Bibcode: 2006Icar..182..118V. https://www.boulder.swri.edu/~davidn/papers/chron.pdf. 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. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 978-0-8165-3213-1. Bibcode: 2015aste.book..297N. 
  16. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 

External links



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