Astronomy:4647 Syuji
| Discovery [1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 9 October 1931 |
| Designations | |
| (4647) Syuji | |
| Named after | Shuji Hayakawa [1] (Japanese astronomer) |
| 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) |
| |{{{apsis}}}|helion}} | 3.6451 AU |
| |{{{apsis}}}|helion}} | 2.1369 AU |
| 2.8910 AU | |
| Eccentricity | 0.2608 |
| Orbital period | 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° |
| 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] |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "4647 Syuji (1931 TU1)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=4647.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "JPL Small-Body Database Browser: 4647 Syuji (1931 TU1)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004647.
- ↑ 3.0 3.1 "Asteroid 4647 Syuji". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=4647+Syuji.
- ↑ 4.0 4.1 4.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 17 May 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
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
- 4647 Syuji at the JPL Small-Body Database
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