4647 Syuji
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=May 2018}}
{{Infobox planet
| minorplanet = yes
| name = 4647 Syuji
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = K. Reinmuth
| discovery_site = Heidelberg Obs.
| discovered = 9 October 1931
| mpc_name = (4647) Syuji
| alt_names = {{mp|1931 TU|1}}{{·}}1970 PD
{{mp|1979 FN|3}}{{·}}1979 GA
{{mp|1980 RF|4}}
| pronounced =
| named_after = Shuji Hayakawa
{{small|(Japanese astronomer)}}
| mp_category = main-belt {{·}}{{small|(outer)}}
background
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 86.39 yr (31,553 d)
| aphelion = 3.6451 AU
| perihelion = 2.1369 AU
| semimajor = 2.8910 AU
| eccentricity = 0.2608
| period = 4.92 yr (1,795 d)
| mean_anomaly = 240.47°
| mean_motion = {{Deg2DMS|0.2005|sup=ms}} / day
| inclination = 6.9377°
| asc_node = 180.58°
| arg_peri = 128.29°
| mean_diameter = {{val|13.864|0.057|ul=km}}
| rotation =
| albedo = {{val|0.063|0.004}}
| spectral_type =
}}
4647 Syuji, provisional designation {{mp|1931 TU|1}}, is a dark background asteroid from the outer regions of the asteroid belt, approximately {{convert|14|km|mi|abbr=off|sigfig=2|sp=us}} 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.
Orbit and classification
Syuji is a non-family asteroid from the main belt's background population. 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. The body's observation arc begins at Heidelberg on 17 October 1931, or eight nights after its official discovery observation. orbital read
Physical characteristics
Syuji has an absolute magnitude of 12.8. 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.
= 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.
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 {{Obscode|877}} in Okutama, west of Tokyo. The official naming was proposed by Takao Kobayashi and the citation was published by the Minor Planet Center on 25 May 1994 ({{small|M.P.C. 23540}}).
References
{{reflist|30em|refs=
|type = 2018-02-27 last obs.
|title = JPL Small-Body Database Browser: 4647 Syuji (1931 TU1)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004647
|publisher = Jet Propulsion Laboratory
|access-date = 17 May 2018}}
|title = 4647 Syuji (1931 TU1)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4647
|access-date = 17 May 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 17 May 2018}}
|title = Asteroid 4647 Syuji
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=4647+Syuji
|access-date = 17 May 2018}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = J. |last6 = Dailey
|first7 = P. R. M. |last7 = Eisenhardt
|first8 = R. S. |last8 = McMillan
|first9 = T. B. |last9 = Spahr
|first10 = M. F. |last10 = Skrutskie
|first11 = D. |last11 = Tholen
|first12 = R. G. |last12 = Walker
|first13 = E. L. |last13 = Wright
|first14 = E. |last14 = DeBaun
|first15 = D. |last15 = Elsbury
|first16 = T. IV |last16 = Gautier
|first17 = S. |last17 = Gomillion
|first18 = A. |last18 = Wilkins
|date = November 2011
|title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 20
|bibcode = 2011ApJ...741...68M
|doi = 10.1088/0004-637X/741/2/68
|arxiv = 1109.4096
|access-date= 17 May 2018}}
}}
External links
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|4647}}
- {{JPL small body}}
{{Minor planets navigator |4646 Kwee |number=4647 |4648 Tirion}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Syuji}}