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词条 1585 Union
释义

  1. Orbit and classification

  2. Physical characteristics

      Rotation period    Diameter and albedo  

  3. Naming

  4. References

  5. External links

{{Infobox planet
| minorplanet = yes
| name = 1585 Union
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovery_ref =  
| discoverer = E. L. Johnson
| discovery_site = Union Obs.
| discovered = 7 September 1947
| mpc_name = (1585) Union
| alt_names = 1947 RG{{·}}1929 DB
1937 QF{{·}}{{mp|1939 CD|1}}
1944 DG{{·}}1949 EE
{{mp|1952 QA|1}}{{·}}1952 SD
| pronounced =
| named_after = Union Observatory
{{small|(aka Johannesburg Obs.)}}[2]
| mp_category = main-belt{{·}}{{small|(outer)}} [3]
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 78.37 yr (28,624 days)
| aphelion = 3.8332 AU
| perihelion = 2.0231 AU
| semimajor = 2.9281 AU
| eccentricity = 0.3091
| period = 5.01 yr (1,830 days)
| mean_anomaly = 304.39°
| mean_motion = {{Deg2DMS|0.1967|sup=ms}} / day
| inclination = 26.187°
| asc_node = 150.10°
| arg_peri = 264.54°
| dimensions = {{val|49.01|18.07}} km[5]
{{val|50.42|1.6}} km[3][7]
{{val|50.68|0.88}} km[8]
{{val|55.271|0.243}} km[9]
{{val|55.42|18.20}} km[10]
{{val|56.014|0.292}} km[11]
| rotation = {{val|9.38}} h[12]
{{val|24}} h {{small|(fragmentary)}}[13]
| albedo = {{val|0.0304|0.0028}}[11]
{{val|0.031|0.004}}[9]
{{val|0.0378|0.003}}[3][7]
{{val|0.038|0.001}}[8]
{{val|0.04|0.04}}[10]
{{val|0.05|0.02}}[5]
| spectral_type = P [11]{{·}}C [3]
B–V {{=}} 0.590 
U–B {{=}} 0.290 
| abs_magnitude = {{val|10.33|0.22}}[25]{{·}}10.35[10]{{·}}10.66[5][7][8]{{·}}10.67[3][11][12]
}}1585 Union, provisional designation {{mp|1947 RG}}, is a dark background asteroid from the outer regions of the asteroid belt, approximately 52 kilometers in diameter. It was discovered on 7 September 1947, by South African astronomer Ernest Johnson at the Union Observatory in Johannesburg, South Africa.[34] The asteroid was named after the discovering observatory.[2]

Orbit and classification

Union is not a member of any known asteroid family. It orbits the Sun in the outer main belt at a distance of 2.0–3.8 AU once every 5.01 years (1,830 days). Its orbit has an eccentricity of 0.31 and an inclination of 26° with respect to the ecliptic.

In 1929, the asteroid was first identified as {{mp|1929 DB}} at the Uccle Observatory in Belgium. The body's observation arc begins at the Finnish Turku Observatory in February 1939, more than 17 years prior to its official discovery observation at Johannesburg.[34]

Physical characteristics

Union has been characterized as a P-type asteroid by the Wide-field Infrared Survey Explorer (WISE), while the LCDB assumes a generic carbonaceous C-type.[3][11]

Rotation period

In March 1984, a rotational lightcurve of Union was obtained from photometric observations by American astronomer Richard Binzel. Lightcurve analysis gave a rotation period of 9.38 hours with a brightness variation of 0.22 magnitude ({{small|U=2}}).[12] In addition, a fragmentary lightcurve with a period of 24 hours was obtained by French amateur astronomer Laurent Bernasconi in 2004 ({{small|U=1}}).[13]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Union measures between 49.01 and 56.014 kilometers in diameter and its surface has an albedo between 0.0304 and 0.05.[5][7][8][9][10][11]

The Collaborative Asteroid Lightcurve Link adopt the results obtained by IRAS, that is, an albedo of 0.0378 and a diameter of 50.42 kilometers. CALL also takes an absolute magnitude of 10.67 from Richard Binzel.[3]

Naming

This minor planet was named after the discovering Union Observatory, also known as the Johannesburg Observatory, Transvaal Observatory (1909–1912) and Republic Observatory (1961–1971). The official naming citation was published by the Minor Planet Center before November 1977 ({{small|M.P.C. 941}}).[49]

References

1. ^1 2 {{cite book |title = Dictionary of Minor Planet Names – (1585) Union |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 125 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1586 |chapter = (1585) Union }}
2. ^1 2 {{cite web |title = 1585 Union (1947 RG) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1585 |accessdate = 30 August 2017}}
3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 30 August 2017}}
4. ^1 2 {{cite web |title = Asteroids and comets rotation curves – (1585) Union |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#001585 |accessdate = 30 August 2017}}
5. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = T. |last2 = Grav |first3 = A. K. |last3 = Mainzer |first4 = C. R. |last4 = Nugent |first5 = J. M. |last5 = Bauer |first6 = R. |last6 = Stevenson |first7 = S. |last7 = Sonnett |date = August 2014 |title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M |journal = The Astrophysical Journal |volume = 791 |issue = 2 |page = 11 |bibcode = 2014ApJ...791..121M |doi = 10.1088/0004-637X/791/2/121 |arxiv = 1406.6645 |access-date= 30 August 2017}}
6. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (1585) Union |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1585%7CUnion |accessdate = 30 August 2017}}
7. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = C. R. |last1 = Nugent |first2 = A. |last2 = Mainzer |first3 = J. |last3 = Masiero |first4 = J. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = T. |last6 = Grav |first7 = E. |last7 = Kramer |first8 = S. |last8 = Sonnett |first9 = R. |last9 = Stevenson |first10 = E. L. |last10 = Wright |date = December 2015 |title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N |journal = The Astrophysical Journal |volume = 814 |issue = 2 |page = 13 |bibcode = 2015ApJ...814..117N |doi = 10.1088/0004-637X/814/2/117 |arxiv = 1509.02522 |access-date= 30 August 2017}}
8. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = C. R. |last1 = Nugent |first2 = A. |last2 = Mainzer |first3 = J. |last3 = Bauer |first4 = R. M. |last4 = Cutri |first5 = E. A. |last5 = Kramer |first6 = T. |last6 = Grav |first7 = J. |last7 = Masiero |first8 = S. |last8 = Sonnett |first9 = E. L. |last9 = Wright |date = September 2016 |title = NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016AJ....152...63N |journal = The Astronomical Journal |volume = 152 |issue = 3 |page = 12 |bibcode = 2016AJ....152...63N |doi = 10.3847/0004-6256/152/3/63 |arxiv = 1606.08923 |access-date= 30 August 2017}}
9. ^1 2 3 4 {{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= 30 August 2017}}
10. ^1 2 3 4 {{cite journal |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 = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004PDSS...12.....T |journal = NASA Planetary Data System |volume = 12 |pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |access-date= 30 August 2017}}
11. ^1 2 3 4 5 6 {{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407 }}
12. ^1 2 3 {{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 |volume = 72 |issue = 1 |pages = 135–208 |issn = 0019-1035 |bibcode = 1987Icar...72..135B |doi = 10.1016/0019-1035(87)90125-4 |access-date= 30 August 2017}}
13. ^1 {{cite journal |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= 30 August 2017}}
[1][2][3][4][5][6][7][8][9][10][11][12][13]

}}

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 |1584 Fuji |number=1585 |1586 Thiele}}{{Small Solar System bodies}}{{DEFAULTSORT:Union}}

4 : Background asteroids|Discoveries by Ernest Leonard Johnson|Named minor planets|Astronomical objects discovered in 1947
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