| 词条 | 1784 Benguella |
| 释义 |
| minorplanet = yes | name = 1784 Benguella | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = [1] | discoverer = C. Jackson | discovery_site = Johannesburg Obs. | discovered = 30 June 1935 | mpc_name = (1784) Benguella | alt_names = 1935 MG{{·}}1938 EX 1950 ON{{·}}1950 QP 1951 YQ{{·}}1953 FT 1957 JF{{·}}1957 MH 1968 HY{{·}}{{mp|1969 UU|1}} | pronounced = | named_after = Benguela [2] {{small|(city in Angola)}} | mp_category = main-belt [1]{{·}}{{small|(inner)}} background [5][6] | orbit_ref = | epoch = 27 April 2019 (JD 2458600.5) | uncertainty = 0 | observation_arc = 83.31 yr (30,430 d) | aphelion = 2.7242 AU | perihelion = 2.0858 AU | semimajor = 2.4050 AU | eccentricity = 0.1327 | period = 3.73 yr (1,362 d) | mean_anomaly = 174.06° | mean_motion = {{Deg2DMS|0.2643|sup=ms}} / day | inclination = 1.4727° | asc_node = 95.271° | arg_peri = 184.89° | mean_diameter = {{val|10.480|0.100|ul=km}}[8] {{val|11.80|0.41|u=km}}[9] {{val|16.68|1.3|u=km}}[10] | rotation = | albedo = {{val|0.0763|0.014}}[10] {{val|0.156|0.012}}[9] {{val|0.237|0.045}}[8] | spectral_type = | abs_magnitude = 12.2[1] 12.30[9][10] }}1784 Benguella, provisional designation {{mp|1935 MG}}, is a background asteroid from the inner regions of the asteroid belt, approximately {{convert|12|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered by South African astronomer Cyril Jackson at the Johannesburg Observatory on 30 June 1935.[1] It was named for the city of Benguela in Angola.[2] The low-numbered asteroid has been studied poorly.[5] Orbit and classificationAccording to modern HCM-analyses, Benguella is a non-family asteroid from the main belt's background population.[5][6] It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.7 AU once every 3 years and 9 months (1,362 days; semi-major axis of 2.41 AU). Its orbit has an eccentricity of 0.13 and an inclination of 1° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Johannesburg in June 1935.[1] NamingThis minor planet was named after Angola's city and chief port Benguela (São Felipe de Benguela), formerly spelled Benguella.[2] The official {{MoMP|1784|naming citation}} was published by the Minor Planet Center on 1 February 1980 ({{small|M.P.C. 5183}}).[26] Physical characteristicsBenguella{{'s}} spectral type is unknown,[5] with no assumptions possible based on the asteroid's albedo (see below)As of 2018, no rotational lightcurve of Benguella has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[5][29] According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Benguella measures between 10.48 and 16.68 kilometers in diameter and its surface has an albedo between 0.076 and 0.24.[8][9][10] References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (1784) Benguella |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 143 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1785 |chapter = (1784) Benguella }} [1][2][3][4][5][6][7][8][9]2. ^1 2 3 4 5 {{cite web |title = 1784 Benguella (1935 MG) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1784 |accessdate = 10 December 2018}} 3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 10 December 2018}} 4. ^1 2 {{cite web |title = Asteroid (1784) Benguella – Proper elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=1784&pc=1.1.6 |accessdate = 4 December 2018}} 5. ^1 2 3 4 5 {{cite web |title = Asteroid 1784 Benguella |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1784+Benguella |accessdate = 10 December 2018}} 6. ^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 |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 }} 7. ^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= 10 December 2018}} (online, [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153]) 8. ^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 = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |journal = NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 |pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |access-date= 10 December 2018}} 9. ^1 {{cite web |title = LCDB Data for (1784) Benguella |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1784%7CBenguella |accessdate = 10 December 2018}} }} External links
5 : Background asteroids|Discoveries by Cyril V. Jackson|Minor planets named for places|Named minor planets|Astronomical objects discovered in 1935 |
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