4760 Jia-xiang

4760 Jia-xiang, provisional designation 1981 GN1, is a background asteroid from the inner regions of the asteroid belt, approximately 5 kilometers (3 miles) in diameter. It was discovered on 1 April 1981, by astronomers at Harvard University's Oak Ridge Observatory in Massachusetts, United States.[1] The presumed stony S-type asteroid was named after Chinese astronomer Zhang Jiaxiang. It has a rotation period of 14.96 hours.[lower-alpha 1][lower-alpha 2]

4760 Jia-xiang
Discovery [1]
Discovered byHarvard College Obs.
Discovery siteOak Ridge Obs.
Discovery date1 April 1981
Designations
(4760) Jia-xiang
Named after
Zhang Jiaxiang [1]
(Chinese astronomer)
1981 GN1 · 1981 GP1
1982 SE5
main-belt [1][2] · (inner)[3]
background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc62.47 yr (22,817 d)
Aphelion2.6236 AU
Perihelion2.0279 AU
2.3258 AU
Eccentricity0.1281
3.55 yr (1,296 d)
37.063°
0° 16m 40.44s / day
Inclination9.8513°
177.82°
130.44°
Physical characteristics
Mean diameter
4.71 km (calculated)[3]
4.79±1.41 km[5]
5.137±0.036 km[6][7]
5.16±1.28 km[8]
14.96±0.0006 h[lower-alpha 1][lower-alpha 2]
14.9601 h[lower-alpha 1][lower-alpha 2]
0.13±0.06[8]
0.20 (assumed)[3]
0.21±0.15[5]
0.227±0.042[6]
0.2275±0.0418[7]
S (assumed)[3]
13.56±0.40[9] · 13.7[7] · 13.90[5] · 14.0[2][3] · 14.29[8]

    Orbit and classification

    Jia-xiang is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the inner main-belt at a distance of 2.0–2.6 AU once every 3 years and 7 months (1,296 days; semi-major axis of 2.33 AU). Its orbit has an eccentricity of 0.13 and an inclination of 10° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in January 1955, or 26 years prior to its official discovery observation at Oak Ridge.[1]

    Physical characteristics

    Rotation period

    In 2017, two rotational lightcurves of Jia-xiang were obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory. Lightcurve analysis gave a rotation period of 14.96 and 14.9601 hours with a brightness amplitude of 0.55 and 0.63 magnitude, respectively (U=3/3).[lower-alpha 1][lower-alpha 2]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Jia-xiang measures between 4.79 and 5.16 kilometers in diameter and its surface has an albedo between 0.13 and 0.2275.[5][6][7][8]

    The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 4.71 kilometers based on an absolute magnitude of 14.0.[3]

    Naming

    This minor planet was named after Chinese astronomer Zhang Jiaxiang (born 1932).[1] The official naming citation was published by the Minor Planet Center on 21 November 1991 (M.P.C. 19339).[10]

    Notes
    1. Pravec (2017) web: rotation period 14.96±0.02 and 14.9601±0.0006 hours with a brightness amplitude of 0.55±0.02 and 0.63±0.02 mag. Quality Code is 3/3. Summary figures at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2017)
    2. Lightcurve plot A and plot B of (4760) Jia-xiang, from Ondrejov data obtained by the NEO Photometric Program and collaborating projects
    gollark: Maybe they're ungendered. Maybe TJ09.
    gollark: I think breeding would become worse due to the extra CB rares presumably being gotten.
    gollark: With infinite egg space, the optimal hunting strategy would just be to pick up stupid amounts of eggs and see what's behind them, and leave most to die.
    gollark: I like to use my small aeon army to precog things so I get the disappointment early.
    gollark: Yes, I know.

    References
    1. "4760 Jia-xiang (1981 GN1)". Minor Planet Center. Retrieved 3 April 2018.
    2. "JPL Small-Body Database Browser: 4760 Jia-xiang (1981 GN1)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 3 April 2018.
    3. "LCDB Data for (4760) Jia-xiang". Asteroid Lightcurve Database (LCDB). Retrieved 3 April 2018.
    4. "Asteroid 4760 Jia-xiang – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    5. 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.
    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.
    7. 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.
    8. 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.
    9. 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.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 April 2018.

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