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词条 1746 Brouwer
释义

  1. Classification and orbit

  2. Physical characteristics

      Rotation period    Diameter and albedo  

  3. Naming

  4. Notes

  5. References

  6. External links

{{Infobox planet
| minorplanet = yes
| name = 1746 Brouwer
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovery_ref =  
| discovered = 14 September 1963
| discoverer = Indiana University
{{nowrap|{{small|(Indiana Asteroid Program)}}}}
| discovery_site = Goethe Link Obs.
| mpc_name = (1746) Brouwer
| alt_names = 1963 RF{{·}}1940 WE
1947 QA
| named_after = Dirk Brouwer
{{small|(astronomer)}} [2]
| mp_category = main-belt{{·}}Hilda [3]
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 76.33 yr (27,878 days)
| aphelion = 4.7671 AU
| perihelion = 3.1284 AU
| semimajor = 3.9478 AU
| eccentricity = 0.2076
| period = 7.84 yr (2,865 days)
| mean_anomaly = 292.05°
| mean_motion = {{Deg2DMS|0.1257|sup=ms}} / day
| inclination = 8.3676°
| asc_node = 321.96°
| arg_peri = 47.580°
| jupiter_moid = 0.8580 AU
| tisserand = 3.0040
| dimensions = {{val|61.50|1.80}} km[5]
{{val|62.523|0.492}}[6]
{{val|64.25|4.9}} km {{small|(IRAS:2)}}[3][8]
| rotation = {{val|19.7255|0.0005}} h[9]
{{val|19.8}} h[10]
{{val|19.88|0.05}} h{{efn|name=LCDB-Slyusarev-2012}}
| albedo = {{val|0.0448|0.008}} {{small|(IRAS:2)}}[3][8]
{{val|0.048|0.006}}[6]
{{val|0.051|0.003}}[5]
| spectral_type = Tholen = D {{·}}D [3][6]
B–V = 0.721
U–B = 0.227
| abs_magnitude = {{val|9.78|0.30}}[20]{{·}}9.95 {{small|(IRAS:2)}}[8]{{·}}9.95[3][5]
}}

1746 Brouwer, provisional designation {{mp|1963 RF}}, is a Hildian asteroid from the outermost region of the asteroid belt, approximately 64 kilometers in diameter.

It was discovered on 14 September 1963, by IU's Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States.[24] It was named after astronomer Dirk Brouwer.[2]

Classification and orbit

Brouwer is a member of the Hilda family, a large group that orbits in resonance with the gas giant Jupiter and are thought to originate from the Kuiper belt. Brouwer orbits the Sun at a distance of 3.1–4.8 AU once every 7 years and 10 months (2,865 days). Its orbit has an eccentricity of 0.21 and an inclination of 8° with respect to the ecliptic.

It was first identified as {{mp|1940 WE}} at Turku Observatory in 1940, extending the body's observation arc by 23 years prior to its official discovery observation.[24]

Physical characteristics

In the Tholen classification, Brouwer is characterized as a dark and reddish D-type asteroid.

Rotation period

Several rotational lightcurves of Brouwer gave a rotation period between 19.72 and 19.88 hours with a brightness variation of 0.21 and 0.35 magnitude ({{small|U=n.a/2/n.a.}}).[9][10]{{efn|name=LCDB-Slyusarev-2012}}

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Brouwer measures between 61.50 and 64.25 kilometers in diameter, and its surface has an albedo between 0.045 and 0.051.[5][6][8]

The Collaborative Asteroid Lightcurve Link agrees with IRAS, that is an albedo of 0.045 and a diameter of 64.25 kilometers with an absolute magnitude of 9.95.[3]

Naming

This minor planet was named in honor of Dutch–American astronomer Dirk Brouwer (1902–1966). Originally at Leiden University and specialized in celestial mechanics, he became director of the Yale University Observatory and was the president of IAU's commission 20, Positions & Motions of Minor Planets, Comets & Satellites, from 1948 to 1955.[2] The official naming citation was published by the Minor Planet Center before November 1977 ({{small|M.P.C. 2883}}).[36]

Notes

{{notelist|refs={{efn|name=LCDB-Slyusarev-2012|1=Slyusarev (2012) web: rotation period {{val|19.88|0.05}} hours with a brightness amplitude of {{val|0.21}}. Summary figures at Asteroid Lightcurve Database for (1746) Brouwer }}

}}

References

1. ^{{cite book |title = Dictionary of Minor Planet Names – (1746) Brouwer |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 139 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1747 |chapter = (1746) Brouwer }}
2. ^{{cite web |title = 1746 Brouwer (1963 RF) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1746 |accessdate = 20 December 2016}}
3. ^{{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 20 December 2016}}
4. ^{{cite web |title = LCDB Data for (1746) Brouwer |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1746%7CBrouwer |accessdate = 20 December 2016}}
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[1][2][3][4][5][6][7][8][9][10]

}}

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|1745 Ferguson|number=1746|1747 Wright}}{{Small Solar System bodies}}{{DEFAULTSORT:Brouwer}}

6 : Hilda asteroids|Discoveries by Indiana University (Indiana Asteroid Program)|Minor planets named for people|Named minor planets|D-type asteroids (Tholen)|Astronomical objects discovered in 1963

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