1185 Nikko
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1185 Nikko
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovered = 17 November 1927
| discoverer = O. Oikawa
| discovery_site = {{nowrap|Tokyo Astronomical Obs. ({{small|389}})}}
| mpc_name = (1185) Nikko
| alt_names = 1927 WC{{·}}{{mp|1930 SE|1}}
{{mp|1930 SG|1}}{{·}}{{mp|1930 SH|1}}
| pronounced =
| named_after = Nikkō {{small|(Japanese city)}}
| mp_category = main-belt{{·}}{{small|(inner)}}
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 86.78 yr (31,697 days)
| aphelion = 2.4744 AU
| perihelion = 2.0006 AU
| semimajor = 2.2375 AU
| eccentricity = 0.1059
| period = 3.35 yr (1,222 days)
| mean_anomaly = 280.93°
| mean_motion = {{Deg2DMS|0.2945|sup=ms}} / day
| inclination = 5.7013°
| asc_node = 71.904°
| arg_peri = 1.9614°
| dimensions = {{val|8.347|0.297}} km
11.35 km {{small|(calculated)}}
{{val|12.56|0.83}} km
| rotation = {{val|3.781|0.0326}}
{{val|3.78615|0.00005}} h
{{val|3.788|0.0326}} h
{{val|3.7889|0.0004}} h
{{val|3.79|0.01}} h
{{val|3.792|0.002}} h
| albedo = {{val|0.164|0.023}}
0.20 {{small|(assumed)}}
{{val|0.370|0.041}}
| spectral_type = S {{small|(Tholen)}}{{·}}S {{small|(SMASS)}}
S
B–V = 0.923
U–B = 0.514
| abs_magnitude = {{val|11.674|0.002}} {{small|(R)}}{{·}}{{val|11.99|0.33}}{{·}}12.09
}}
1185 Nikko, provisional designation {{mp|1927 WC}}, is a stony asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 17 November 1927 by Okuro Oikawa at the Tokyo Astronomical Observatory, Japan. The asteroid was named after the Japanese city of Nikkō.
Orbit and classification
Nikko orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,222 days). Its orbit has an eccentricity of 0.11 and an inclination of 6° with respect to the ecliptic. Nikko{{'}}s observation arc begins with its first used observation taken at Johannesburg Observatory in 1930, or 3 years after its official discovery observation at Tokyo.
Physical characteristics
In both the Tholen and SMASS taxonomy, Nikko is a common stony S-type asteroid.
= Rotation period =
Between 2004 and 2011, several rotational lightcurves of Nikko were obtained from photometric observations taken by astronomers Laurent Bernasconi, Hiromi and Hiroko Hamanowa, John Menke, Robert Stephens, as well as at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period between 3.781 and 3.792 hours with a brightness variation between 0.26 and 0.50 magnitude ({{small|U=3/3/3/3-/2/2}}).
= Diameter and albedo =
According to the survey carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Nikko measures 8.347 and 12.56 kilometers in diameter, and its surface has an albedo of 0.370 and 0.164, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 11.35 kilometers with an absolute magnitude of 12.09.
Naming
This minor planet was named for the Japanese city of Nikkō, located in the Tochigi Prefecture of central Japan. The tourist resort is known for its Shinto shrine and a UNESCO World Heritage Site Nikkō Tōshō-gū. The official naming citation was published by Paul Herget in The Names of the Minor Planets in 1955 ({{small|H 110}}).
References
{{reflist|refs=
|type = 2017-07-01 last obs.
|title = JPL Small-Body Database Browser: 1185 Nikko (1927 WC)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001185
|publisher = Jet Propulsion Laboratory
|accessdate = 26 July 2017}}
|title = Dictionary of Minor Planet Names – (1185) Nikko
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 99
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1186 |chapter = (1185) Nikko }}
|title = 1185 Nikko (1927 WC)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1185
|accessdate = 12 March 2017}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 12 March 2017}}
|title = Asteroids and comets rotation curves – (1185) Nikko
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page3cou.html#001185
|accessdate = 12 March 2017}}
|title = LCDB Data for (1185) Nikko
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1185%7CNikko
|accessdate = 12 March 2017}}
|display-authors = 6
|first1 = Fumihiko |last1 = Usui
|first2 = Daisuke |last2 = Kuroda
|first3 = Thomas G. |last3 = Müller
|first4 = Sunao |last4 = Hasegawa
|first5 = Masateru |last5 = Ishiguro
|first6 = Takafumi |last6 = Ootsubo
|first7 = Daisuke |last7 = Ishihara
|first8 = Hirokazu |last8 = Kataza
|first9 = Satoshi |last9 = Takita
|first10 = Shinki |last10 = Oyabu
|first11 = Munetaka |last11 = Ueno
|first12 = Hideo |last12 = Matsuhara
|first13 = Takashi |last13 = Onaka
|date = October 2011
|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey
|journal = Publications of the Astronomical Society of Japan
|volume = 63
|issue = 5
|pages = 1117–1138
|bibcode = 2011PASJ...63.1117U
|doi = 10.1093/pasj/63.5.1117
|doi-access= free
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=1185 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
|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 = C. |last6 = Nugent
|first7 = M. S. |last7 = Cabrera
|date = November 2012
|title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M
|journal = The Astrophysical Journal Letters
|volume = 759
|issue = 1
|page = 5
|bibcode = 2012ApJ...759L...8M
|doi = 10.1088/2041-8205/759/1/L8
|arxiv = 1209.5794
|access-date= 12 March 2017}}
|author = Menke, John
|date = December 2005
|title = Asteroid lightcurve results from Menke Observatory
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2005MPBu...32...85M
|journal = The Minor Planet Bulletin
|volume = 32
|issue = 4
|pages = 85–88
|issn = 1052-8091
|bibcode = 2005MPBu...32...85M
|access-date= 12 March 2017}}
|author = Stephens, Robert D.
|date = June 2005
|title = Rotational periods of 743 Eugenisis, 995 Sternberga, 1185 Nikko 2892 Filipenko, 3144 Brosche, and 3220 Murayama
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2005MPBu...32...27S
|journal = The Minor Planet Bulletin
|volume = 32
|issue = 2
|pages = 27–28
|issn = 1052-8091
|bibcode = 2005MPBu...32...27S
|access-date= 12 March 2017}}
|display-authors = 6
|author = Hanus, J.
|author2 = Durech, J.
|author3 = Broz, M.
|author4 = Warner, B. D.
|author5 = Pilcher, F.
|author6 = Stephens, R.
|author7 = Oey, J.
|author8 = Bernasconi, L.
|author9 = Casulli, S.
|author10 = Behrend, R.
|author11 = Polishook, D.
|author12 = Henych, T.
|author13 = Lehký, M.
|author14 = Yoshida, F.
|author15 = Ito, T.
|date = June 2011
|title = A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011A&A...530A.134H
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|volume = 530
|pages = 16
|bibcode = 2011A&A...530A.134H
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|arxiv = 1104.4114
|access-date= 12 March 2017}}
|display-authors = 6
|first1 = Adam |last1 = Waszczak
|first2 = Chan-Kao |last2 = Chang
|first3 = Eran O. |last3 = Ofek
|first4 = Russ |last4 = Laher
|first5 = Frank |last5 = Masci
|first6 = David |last6 = Levitan
|first7 = Jason |last7 = Surace
|first8 = Yu-Chi |last8 = Cheng
|first9 = Wing-Huen |last9 = Ip
|first10 = Daisuke |last10 = Kinoshita
|first11 = George |last11 = Helou
|first12 = Thomas A. |last12 = Prince
|first13 = Shrinivas |last13 = Kulkarni
|date = September 2015
|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W
|journal = The Astronomical Journal
|volume = 150
|issue = 3
|page = 35
|bibcode = 2015AJ....150...75W
|doi = 10.1088/0004-6256/150/3/75
|arxiv = 1504.04041
|access-date= 12 March 2017}}
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
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|bibcode = 2015Icar..261...34V
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|arxiv = 1506.00762
|access-date= 12 March 2017}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|1185}}
- {{JPL small body}}
{{Minor planets navigator |1184 Gaea |number=1185 |1186 Turnera}}
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