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词条 1111 Reinmuthia
释义

  1. Orbit and classification

  2. Physical characteristics

      Rotation period    Poles and shape    Diameter and albedo  

  3. Naming

  4. Notes

  5. References

  6. External links

{{Infobox planet
| minorplanet = yes
| name = 1111 Reinmuthia
| background = #D6D6D6
| image = 1111Reinmuthia (Lightcurve Inversion).png
| image_size = 265
| caption = Lightcurve-based 3D inversion model of Reinmuthia
| discovery_ref =  
| discoverer = K. Reinmuth
| discovery_site = Heidelberg Obs.
| discovered = 11 February 1927
| mpc_name = (1111) Reinmuthia
| alt_names = 1927 CO{{·}}1929 QG
| pronounced =
| named_after = Karl Reinmuth [2]
{{small|(the discoverer himself)}}
| mp_category = main-belt{{·}}{{small|(outer)}} [3]
background [4]
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 90.72 yr (33,137 days)
| aphelion = 3.2947 AU
| perihelion = 2.6911 AU
| semimajor = 2.9929 AU
| eccentricity = 0.1008
| period = 5.18 yr (1,891 days)
| mean_anomaly = 329.12°
| mean_motion = {{Deg2DMS|0.1904|sup=ms}} / day
| inclination = 3.8917°
| asc_node = 132.44°
| arg_peri = 236.17°
| mean_diameter = {{val|24.38|0.48}} km[6]
41.26 km {{small|(derived)}}[3]
| rotation = {{val|4.00742|0.00005}} h[8]
{{val|4.007347}} h[9]
{{val|4.00750|0.00003}} h[8]
{{val|4.0075|0.0001}} h[11]{{efn|name=lightcurve-plot-Hamanowa}}
{{val|4.02|}} h[12]
| albedo = 0.057 {{small|(assumed)}}[3]
{{val|0.167|0.008}}[6]
| spectral_type = Tholen {{=}} FXU: [3]
B–V {{=}} {{val|0.639|0.016}}
U–B {{=}} {{val|0.230|0.030}}
| abs_magnitude = 10.65[3][12]{{·}}10.67[6]
}}1111 Reinmuthia, provisional designation {{mp|1927 CO}}, is a very elongated asteroid from the background population in the outer region of the asteroid belt. It was discovered on 11 February 1927, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[23] It measures approximately 40 kilometers in diameter and has a short rotation period of 4.02 hours for its size.[3] The asteroid was later named in honor of the discoverer.[2]

Orbit and classification

Reinmuthia is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.3 AU once every 5 years and 2 months (1,891 days; semi-major axis of 2.99 AU). Its orbit has an eccentricity of 0.10 and an inclination of 4° with respect to the ecliptic. The body's observation arc begins at Heidelberg with its official discovery observation.[23]

Physical characteristics

In the Tholen classification, Reinmuthia has an ambiguous spectral type, closest to that of a dark F-type and somewhat similar to an X-type asteroid. The spectrum had also been flagged as "unusual" and "nosy" by Tholen (FXU:).

Rotation period

Rotational lightcurves of Reinmuthia have been obtained from photometric observations by American astronomer Richard Binzel as well as by Hiromi and Hiroko Hamanowa at the Hamanowa Astronomical Observatory ({{small|D91}}) in Japan ({{small|U=3/3/3}}).[8][11][12] Lightcurve analysis gave a consolidated, well-defined rotation period of 4.02 hours with a high brightness amplitude between 0.61 and 0.95 magnitude ({{small|U=3}}).[3]{{efn|name=lightcurve-plot-Hamanowa}}

Poles and shape

Lightcurve inversion also modeled the body's shape and poles. In 2013, modelling by an international study using photometric data from the US Naval Observatory, the Uppsala Asteroid Photometric Catalogue, the Palomar Transient Factory and the Catalina Sky Survey gave a similar sidereal period of 4.007347 hours and two spin axes of (356.0°, 68.0°) and (153.0°, 78.0°) in ecliptic coordinates (λ, β).

The body's very elongated shape had already been indicated by the high brightness variation measured during the photometric observations.[9]

Diameter and albedo

According to the survey carried out by the Japanese Akari satellite, Reinmuthia measures 24.38 kilometers in diameter and its surface has an albedo of 0.167.[6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and derives a diameter of 41.26 kilometers based on an absolute magnitude of 10.65.[3]

Naming

This minor planet was named after its discoverer, Karl Reinmuth (1892–1979), a German astronomer at the Heidelberg-Königstuhl State Observatory and a prolific discoverer of minor planets. In total, he discovered 395 asteroids, most of them during the 1920s and 1930s, which was a unique record for many years. His discoveries include 1862 Apollo and 69230 Hermes, two lost asteroids and near-Earth objects as well as several large Jupiter trojans. His 1931-discovered asteroid (11435) 1931 UB is the oldest discovered yet still unnamed asteroid. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 104}}).[2]

Notes

{{notelist|refs={{efn|name=lightcurve-plot-Hamanowa|1=[https://web.archive.org/web/20140113001323/http://www2.ocn.ne.jp/~hamaten/01111reinmuthia-lc2.htm Lightcurve plot of (1111) Reinmuthia], by H. & H. Hamanowa (2009) from observations at the Hamanowa Astronomical Observatory (D91). Rotation period {{val|4.0075|0.0001}} hours (0.166979 days) and a brightness amplitude of {{val|0.945|0.005}} mag. Summary figures at the LCDB}}

}}

References

1. ^{{cite book |title = Dictionary of Minor Planet Names – (1111) Reinmuthia |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 94 |date = 2007 |url = https://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1112 |isbn = 978-3-540-00238-3 |accessdate = 26 January 2018 |deadurl = unfit |archiveurl = https://web.archive.org/web/20160915233757/https://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1112 |archivedate= 15 September 2016}}
2. ^{{cite web |title = 1111 Reinmuthia (1927 CO) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1111 |accessdate = 26 January 2018}}
3. ^{{cite web |title = Asteroids and comets rotation curves – (1111) Reinmuthia |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page3cou.html#001111 |accessdate = 26 January 2018}}
4. ^{{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 26 January 2018}}
5. ^{{cite web |title = LCDB Data for (1111) Reinmuthia |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1111%7CReinmuthia |accessdate = 26 January 2018}}
6. ^{{cite journal |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 |url = http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html |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 |access-date= 26 January 2018}}
7. ^{{Cite journal |author = Binzel, R. P. |date = October 1987 |title = A photoelectric survey of 130 asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987Icar...72..135B |journal = Icarus |pages = 135–208 |issn = 0019-1035 |bibcode = 1987Icar...72..135B |doi = 10.1016/0019-1035(87)90125-4 |access-date= 26 January 2018}}
8. ^{{Cite journal |first1 = Hiromi |last1 = Hamanowa |first2 = Hiroko |last2 = Hamanowa |date = July 2009 |title = Lightcurves of 494 Virtus, 556 Phyllis, 624 Hektor 657 Gunlod, 111 Reinmuthia, 1188 Gothlandia, and 1376 Michelle |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MPBu...36...87H |journal = The Minor Planet Bulletin |volume = 36 |issue = 3 |pages = 87–88 |issn = 1052-8091 |bibcode = 2009MPBu...36...87H |access-date= 26 January 2018}}
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[1][2][3][4][5][6][7][8][9]

}}

External links

  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
  • Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
  • Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
  • {{JPL small body}}
{{Minor planets navigator |1110 Jaroslawa |number=1111 |1112 Polonia}}{{Small Solar System bodies}}{{DEFAULTSORT:Reinmuthia}}

6 : Background asteroids|Discoveries by Karl Wilhelm Reinmuth|Minor planets named for people|Named minor planets|FXU:-type asteroids (Tholen)|Astronomical objects discovered in 1927

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