| 词条 | 1431 Luanda |
| 释义 |
| minorplanet = yes | name = 1431 Luanda | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discoverer = C. Jackson | discovery_site = Johannesburg | discovered = 29 July 1937 | mpc_name = (1431) Luanda | alt_names = 1937 OB{{·}}1949 KZ | pronounced = | named_after = Luanda [2] {{small|(Capital of Angola)}} | mp_category = main-belt{{·}}{{small|(middle)}} Eunomia [3][4] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 80.22 yr (29,300 days) | aphelion = 3.0989 AU | perihelion = 2.1408 AU | semimajor = 2.6199 AU | eccentricity = 0.1829 | period = 4.24 yr (1,549 days) | mean_anomaly = 293.57° | mean_motion = {{Deg2DMS|0.2324|sup=ms}} / day | inclination = 13.987° | asc_node = 117.73° | arg_peri = 224.19° | dimensions = {{val|13.608|1.966}} km[6] 13.88 km {{small|(calculated)}}[3] | rotation = {{val|4.141|0.004}} h[8] {{val|5.360|0.002}} h[9] | albedo = 0.21 {{small|(assumed)}}[3] {{val|0.360|0.347}}[6] | spectral_type = LS [12]{{·}}S {{small|(assumed)}}[3] | abs_magnitude = 11.06[6]{{·}}11.6[3]{{·}}11.7{{·}}{{val|12.38|0.42}}[12] }}1431 Luanda, provisional designation {{mp|1937 OB}}, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 29 July 1937, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[18] The asteroid was named after the city of Luanda.[2] Orbit and classificationLuanda is a member of the Eunomia family ({{small|502}}),[4] a prominent family of stony S-type asteroid and the largest one in the intermediate main belt with more than 5,000 members.[21]{{rp|23}} It orbits the Sun in the central asteroid belt at a distance of 2.1–3.1 AU once every 4 years and 3 months (1,549 days). Its orbit has an eccentricity of 0.18 and an inclination of 14° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Johannesburg in 1937.[18]Physical characteristicsLuanda has been characterized as a L/S-type asteroid by Pan-STARRS photometric survey.[12] The LCDB assumes it to be a common stony S-type asteroid,[3] in-line with the family's overall spectral type.[21]{{rp|23}} Rotation periodIn December 1997, a rotational lightcurve of Luanda was obtained from photometric observations at the Félix Aguilar Observatory in Argentina . Lightcurve analysis gave a rotation period of 5.360 hours with a brightness variation of 1.0 magnitude ({{small|U=2}}).[9] In January 2007, French amateur astronomer René Roy obtained a period of 4.141 hours with an amplitude of 0.77 magnitude ({{small|U=9-}}).[8] A high brightness amplitude indicates that the body has an elongated rather than spherical shape. Diameter and albedoAccording to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Luanda measures 13.61 kilometers in diameter and its surface has an albedo of 0.36.[6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for Eunomian asteroids of 0.21 – derived from 15 Eunomia, the parent body of this family – and calculates a diameter of 13.88 kilometers based on an absolute magnitude of 11.6.[3] NamingThis minor planet was named after the city of Luanda, capital of Angola.[2] The official naming citation was published by the Minor Planet Center on 1 February 1980 ({{small|M.P.C. 5182}}).[32] References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (1431) Luanda |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 115 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1432 |chapter = (1431) Luanda }} [1][2][3][4][5][6][7][8][9][10]2. ^1 2 {{cite web |title = 1431 Luanda (1937 OB) |website = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1431 |accessdate = 24 October 2017}} 3. ^1 {{cite web |title = MPC/MPO/MPS Archive |website = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 24 October 2017}} 4. ^1 2 {{cite web |title = Asteroids and comets rotation curves – (1431) Luanda |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#001431 |accessdate = 24 October 2017}} 5. ^1 2 {{cite web |title = Small Bodies Data Ferret |website = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 24 October 2017}} 6. ^1 2 {{Cite book |first1 = D. |last1 = Nesvorný |first2 = M. |last2 = Broz |first3 = V. |last3 = Carruba |date = December 2014 |title = Identification and Dynamical Properties of Asteroid Families |journal = Asteroids IV |pages = 297–321 |bibcode = 2015aste.book..297N |doi = 10.2458/azu_uapress_9780816532131-ch016 |arxiv = 1502.01628 |isbn = 9780816532131 }} 7. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (1431) Luanda |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1431%7CLuanda |accessdate = 24 October 2017}} 8. ^1 2 3 4 {{cite journal |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= 24 October 2017}} 9. ^1 2 {{Cite journal |first1 = R. |last1 = Gil-Hutton |first2 = |last2 = Cañ |first3 = M. |last3 = ada |date = April 2003 |title = Photometry of Fourteen Main Belt Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2003RMxAA..39...69G |journal = Revista Mexicana de Astronomía y Astrofísica |volume=39 |pages = 69–76 |bibcode = 2003RMxAA..39...69G |access-date= 24 October 2017}} 10. ^1 2 3 {{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 |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |url = https://pure.qub.ac.uk/portal/en/publications/absolute-magnitudes-and-slope-parameters-for-250000-asteroids-observed-by-panstarrs-ps1--preliminary-results(b84b1999-a9a5-4c46-96d1-60ce154b521e).html }} }} External links
5 : Eunomia asteroids|Discoveries by Cyril V. Jackson|Minor planets named for places|Named minor planets|Astronomical objects discovered in 1937 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。