2012 Guo Shou-Jing

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]

2012 Guo Shou-Jing
Discovery [1]
Discovered byPurple Mountain Obs.
Discovery sitePurple Mountain Obs.
Discovery date9 October 1964
Designations
(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
Eccentricity0.1782
3.55 yr (1,298 days)
6.7252°
0° 16m 38.64s / day
Inclination2.9066°
277.11°
36.696°
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]
0.030±0.006[6]
0.035±0.041[8]
0.04±0.04[9]
0.04±0.03[7]
0.0486±0.0016[5]
0.070±0.004[4]
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]

    Orbit and classification

    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

    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

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

    Fragmentary lightcurve

    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

    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]

    Naming

    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 official naming citation was published by the Minor Planet Center on 1 August 1978 (M.P.C. 4420).[13]

    References
    1. "JPL Small-Body Database Browser: 2012 Guo Shou-Jing (1964 TE2)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 28 June 2017.
    2. 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. "LCDB Data for (2012) Guo Shou-Jing". Asteroid Lightcurve Database (LCDB). Retrieved 28 June 2017.
    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. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    5. 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. 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. 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. 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. 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. Behrend, Raoul. "Asteroids and comets rotation curves – (2012) Guo Shou-Jing". Geneva Observatory. Retrieved 28 June 2017.
    11. 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. "2012 Guo Shou-Jing (1964 TE2)". Minor Planet Center. Retrieved 28 June 2017.
    13. Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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