2012 Guo Shou-Jing

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2012 Guo Shou-Jing
Discovery [1]
Discovered byPurple Mountain Obs.
Discovery sitePurple Mountain Obs.
Discovery date9 October 1964
MPC designation(2012) Guo Shou-Jing
Named after
Guo Shoujing
(Chinese astronomer)[2]
1964 TE2 · 1971 SF1
1974 MS
main-belt · Flora[3] · Interloper
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.80 yr (23,303 days)
Aphelion2.7436 AU
Perihelion1.9137 AU
2.3286 AU
3.55 yr (1,298 days)
0° 16m 38.64s / day
Physical characteristics
Dimensions5.67 km (calculated)[3]
11.65±0.26 km[4]
11.931±0.080 km[5]
12.248±0.035 km[6]
12.82±3.11 km[7]
14.46±4.71 km[8]
14.70±4.42 km[9]
12 h[10]
0.24 (assumed)[3]
C[11] · S[3]
13.20[4][5] · 13.30[9] · 13.4[1][3] · 13.46[8] · 13.51±0.22[11] · 13.56[7]

2012 Guo Shou-Jing, provisional designation 1964 TE2, is a carbonaceous asteroid and Florian interloper from the inner regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 9 October 1964, by astronomers at the Purple Mountain Observatory in Nanking, China.[12] The asteroid was named after Chinese astronomer Guo Shoujing.[2]

Orbit and classification[edit]

Guo Shou-Jing orbits the Sun at a distance of 1.9–2.7 AU once every 3 years and 7 months (1,298 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.[1] The body's observation arc begins 11 years prior to its official discovery observation, with a precovery taken at Palomar Observatory in August 1953.[12]

Florian interloper[edit]

Guo Shou-Jing is a dark, carbonaceous asteroid but possesses the orbital characteristics of a member of the Flora family, which is one of the largest groups of bright, stony S-type asteroids in the main-belt. It is therefore thought to be an unrelated interloper that does not origin from the Flora family's parent body.

Physical characteristics[edit]

Guo Shou-Jing has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey.[11]

Fragmentary lightcurve[edit]

In August 2010, a fragmentary rotational lightcurve of Guo Shou-Jing was obtained from photometric observations by French amateur astronomer René Roy . Lightcurve analysis gave a rotation period of 12 hours with a brightness variation of 0.05 magnitude (U=1+).[10]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Guo Shou-Jing measures between 11.65 and 14.70 kilometers in diameter and its surface has a low albedo between 0.030 and 0.070.[4][5][6][7][8][9]

Based on purely orbital criteria, the Collaborative Asteroid Lightcurve Link (erroneously) assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and subsequently calculates a smaller diameter of 5.67 kilometers.[3]


This minor planet was named after Chinese astronomer and engineer Guo Shoujing (1231–1316) who lived during the Yuan Dynasty.[2] He designed and constructed several astronomical instruments for precise observations and has been called the "Tycho Brahe of China". The approved naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 4420).[13]


  1. ^ a b c d "JPL Small-Body Database Browser: 2012 Guo Shou-Jing (1964 TE2)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 28 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2012) Guo Shou-Jing". Dictionary of Minor Planet Names – (2012) Guo Shou-Jing. Springer Berlin Heidelberg. p. 163. doi:10.1007/978-3-540-29925-7_2013. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (2012) Guo Shou-Jing". Asteroid Lightcurve Database (LCDB). Retrieved 28 June 2017.
  4. ^ a b c d 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. Retrieved 28 June 2017.
  5. ^ a b c d 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.
  6. ^ a b c 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 28 June 2017.
  7. ^ a b c d 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. Retrieved 28 June 2017.
  8. ^ a b c d 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 28 June 2017.
  9. ^ a b c d 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 28 June 2017.
  10. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (2012) Guo Shou-Jing". Geneva Observatory. Retrieved 28 June 2017.
  11. ^ a b c 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 28 June 2017.
  12. ^ a b "2012 Guo Shou-Jing (1964 TE2)". Minor Planet Center. Retrieved 28 June 2017.
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 June 2017.

External links[edit]