4647 Syuji

Last updated

4647 Syuji
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date9 October 1931
Designations
(4647) Syuji
Named after
Shuji Hayakawa [1]
(Japanese astronomer)
1931 TU1 ·1970 PD
1979 FN3 ·1979 GA
1980 RF4
main-belt [1] [2]  ·(outer)
background [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 86.39 yr (31,553 d)
Aphelion 3.6451 AU
Perihelion 2.1369 AU
2.8910 AU
Eccentricity 0.2608
4.92 yr (1,795 d)
240.47°
0° 12m 1.8s / day
Inclination 6.9377°
180.58°
128.29°
Physical characteristics
13.864±0.057  km [4]
0.063±0.004 [4]
12.8 [2]

    4647 Syuji, provisional designation 1931 TU1, is a dark background asteroid from the outer regions of the asteroid belt, approximately 14 kilometers (8.7 miles) in diameter. It was discovered on 9 October 1931, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The likely carbonaceous asteroid was named for Japanese astronomer Shuji Hayakawa. [1]

    Contents

    Orbit and classification

    Syuji is a non-family asteroid from the main belt's background population. [3] It orbits the Sun in the outer main-belt at a distance of 2.1–3.6  AU once every 4 years and 11 months (1,795 days; semi-major axis of 2.89 AU). Its orbit has an eccentricity of 0.26 and an inclination of 7° with respect to the ecliptic. [2] The body's observation arc begins at Heidelberg on 17 October 1931, or eight nights after its official discovery observation. [1] orbital read

    Physical characteristics

    Syuji has an absolute magnitude of 12.8. [2] Based on the body's albedo (see below) and its location in the asteroid belt, it is likely a carbonaceous asteroid. As of 2018, no rotational lightcurve of Syuji has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. [2]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Syuji measures 13.864 kilometers in diameter and its surface has an albedo of 0.063. [4]

    Naming

    This minor planet was named after Japanese astronomer Shuji Hayakawa (born 1958; first name also spelled "Syuji" or "Shūji"), an observer of comets and discoverer of minor planets at the Okutama Observatory ( 877 ) in Okutama, west of Tokyo. [1] The official naming was proposed by Takao Kobayashi and the citation was published by the Minor Planet Center on 25 May 1994 ( M.P.C. 23540). [5]

    References

    1. 1 2 3 4 5 6 "4647 Syuji (1931 TU1)". Minor Planet Center. Retrieved 17 May 2018.
    2. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 4647 Syuji (1931 TU1)" (2018-02-27 last obs.). Jet Propulsion Laboratory . Retrieved 17 May 2018.
    3. 1 2 "Asteroid 4647 Syuji". Small Bodies Data Ferret. Retrieved 17 May 2018.
    4. 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 17 May 2018.
    5. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2018.