2064 Thomsen
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 2064 Thomsen
| background = #FA8072
| image = 002064-asteroid shape model (2064) Thomsen.png
| image_scale =
| caption = Shape model of Thomsen from its lightcurve
| discoverer = L. Oterma
| discovery_site = Turku Obs.
| discovered = 8 September 1942
| mpc_name = (2064) Thomsen
| alt_names = 1942 RQ{{·}}1958 RO
1974 OK{{·}}{{mp|1977 FE|3}}
1977 KA{{·}}A913 QB
| named_after = Ivan Leslie Thomsen
{{small|(New Zealand astronomer)}}
| mp_category = Mars-crosser
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 74.50 yr (27,211 days)
| aphelion = 2.8967 AU
| perihelion = 1.4600 AU
| semimajor = 2.1783 AU
| eccentricity = 0.3298
| period = 3.22 yr (1,174 days)
| mean_anomaly = 142.30°
| mean_motion = {{Deg2DMS|0.3066|sup=ms}} / day
| inclination = 5.6946°
| asc_node = 302.16°
| arg_peri = 2.7479°
| moid = 0.4446 AU
| mean_diameter = {{val|8.09|0.12|ul=km}}
13.59 km {{small|(derived)}}
{{val|13.61|1.6}} km {{small|(IRAS:2)}}
| rotation = {{val|4.2267|0.0001}} h
{{val|4.233|}} h
{{val|4.244023|0.000001}} h
{{val|4.253|0.005}} h
| albedo = {{val|0.0549|0.015}} {{small|(IRAS:2)}}
0.0644 {{small|(derived)}}
{{val|0.162|0.006}}
| spectral_type = SMASS {{=}} S{{·}}S
B–V = 0.887
U–B = 0.524
| abs_magnitude = 12.6{{·}}12.93{{·}}13.10{{·}}{{val|13.44|0.31}}
}}
2064 Thomsen (prov. designation: {{mp|1942 RQ}}) is a stony asteroid and Mars-crosser on an eccentric orbit, that measures approximately {{convert|13|km|mi|abbr=off|sp=us}} in diameter. The asteroid was discovered by Finnish astronomer Liisi Oterma at Turku Observatory, Finland, on 8 September 1942. It was named after New Zealand astronomer Ivan Leslie Thomsen
Orbit and classification
The S-type asteroid orbits the Sun in the inner main-belt at a distance of 1.5–2.9 AU once every 3 years and 3 months (1,174 days). Its orbit has an eccentricity of 0.33 and an inclination of 6° with respect to the ecliptic.
Naming
This minor planet was named in memory of New Zealand astronomer Ivan Leslie Thomsen (1910–1969), director of the Carter Observatory, Wellington, from 1945 until he was appointed director of the Mount John University Observatory only two months before his death. He was an enthusiastic coordinator of New Zealand's astronomy and his efforts eventually led to the minor-planet observing program with the Carter Observatory 41-cm reflector. It was the 1977 rediscovery at the Carter Observatory that allowed this minor planet to be numbered. The official {{MoMP|2064|naming citation}} was published by the Minor Planet Center on 1 August 1978 ({{small|M.P.C. 4421}}).
Physical characteristics
Four rotational lightcurves gave a well-defined rotation period of 4.233 hours with a brightness variation of 0.62–0.69 magnitude ({{small|U=3/3/ .a./3}}) and an albedo of 0.055 and 0.16, as measured by the IRAS and Akari surveys, respectively.
References
{{reflist|30em|refs=
|type = 2017-03-09 last obs.
|title = JPL Small-Body Database Browser: 2064 Thomsen (1942 RQ)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002064
|archive-url = https://web.archive.org/web/20161220082103/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002064
|url-status = dead
|archive-date = 20 December 2016
|publisher = Jet Propulsion Laboratory
|accessdate = 11 June 2017}}
|title = Dictionary of Minor Planet Names
|url = https://archive.org/details/dictionaryminorp00schm
|url-access = limited
|chapter = (2064) Thomsen
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = [https://archive.org/details/dictionaryminorp00schm/page/n180 167]
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_2065}}
|title = 2064 Thomsen (1942 RQ)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2064
|accessdate = 8 December 2016}}
|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008)
|year = 2009
|url = https://archive.org/details/dictionaryminorp2008schm
|url-access = limited
|chapter = Appendix – Publication Dates of the MPCs
|last = Schmadel |first=Lutz D.
|publisher = Springer Berlin Heidelberg
|page = [https://archive.org/details/dictionaryminorp2008schm/page/n230 221]
|isbn = 978-3-642-01964-7
|doi = 10.1007/978-3-642-01965-4}}
|title = Asteroids and comets rotation curves – (2064) Thomsen
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page4cou.html#002064
|accessdate = 8 December 2016}}
|title = LCDB Data for (2064) Thomsen
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2064%7CThomsen
|accessdate = 8 December 2016}}
|first1 = E. F. |last1 = Tedesco
|first2 = P. V. |last2 = Noah
|first3 = M. |last3 = Noah
|first4 = S. D. |last4 = Price
|date = October 2004
|title = IRAS Minor Planet Survey V6.0
|url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab
|journal = NASA Planetary Data System
|volume = 12
|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode = 2004PDSS...12.....T
|access-date= 22 October 2019}}
|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=
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=2064 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
|author = Wisniewski, W. Z.
|date = March 1991
|title = Physical studies of small asteroids. I - Lightcurves and taxonomy of 10 asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1991Icar...90..117W
|journal = Icarus
|volume = 90
|issue = 1
|pages = 117–122
|issn = 0019-1035
|bibcode = 1991Icar...90..117W
|doi = 10.1016/0019-1035(91)90073-3
|access-date= 8 December 2016}}
|last1 = Warner
|first1 = Brian D.
|date = July 2015
|title = Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 December - 2015 March
|journal = Minor Planet Bulletin
|url = http://www.minorplanet.info/MPB/issues/MPB_42-3.pdf
|volume = 42
|issue = 3
|pages = 167–172
|bibcode = 2015MPBu...42..167W
|issn = 1052-8091
|access-date = 18 March 2020
|archive-date = 18 February 2020
|archive-url = https://web.archive.org/web/20200218084944/http://www.minorplanet.info/MPB/issues/MPB_42-3.pdf
|url-status = dead
}}
|first1 = J. |last1 = Durech
|first2 = J. |last2 = Hanus
|first3 = D. |last3 = Oszkiewicz
|first4 = R. |last4 = Vanco
|date = March 2016
|title = Asteroid models from the Lowell photometric database
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...587A..48D
|journal = Astronomy and Astrophysics
|volume = 587
|page = 6
|bibcode = 2016A&A...587A..48D
|doi = 10.1051/0004-6361/201527573
|arxiv = 1601.02909
|access-date= 8 December 2016}}
|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
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|access-date= 8 December 2016}}
|first1 = B. |last1 = Carry
|first2 = E. |last2 = Solano
|first3 = S. |last3 = Eggl
|first4 = F. E. |last4 = DeMeo
|date = April 2016
|title = Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry
|journal = Icarus
|volume = 268
|pages = 340–354
|bibcode = 2016Icar..268..340C
|doi = 10.1016/j.icarus.2015.12.047
|arxiv = 1601.02087 }}
}}
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