astro.wikisort.org - Asteroid

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]

4647 Syuji

Discovery [1]
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	9 October 1931
Designations
MPC designation	(4647) Syuji
Named after	Shuji Hayakawa [1] (Japanese astronomer)
Alternative designations	1931 TU1 · 1970 PD 1979 FN3 · 1979 GA 1980 RF4
Minor planet category	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
Semi-major axis	2.8910 AU
Eccentricity	0.2608
Orbital period (sidereal)	4.92 yr (1,795 d)
Mean anomaly	240.47°
Mean motion	0° 12m 1.8s / day
Inclination	6.9377°
Longitude of ascending node	180.58°
Argument of perihelion	128.29°
Physical characteristics
Mean diameter	13.864±0.057 km[4]
Geometric albedo	0.063±0.004[4]
Absolute magnitude (H)	12.8[2]

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

External links

• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 4647 Syuji at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 4647 Syuji at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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