| 词条 | 1242 Zambesia |
| 释义 |
| minorplanet = yes | name = 1242 Zambesia | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discoverer = C. Jackson | discovery_site = Johannesburg Obs. | discovered = 28 April 1932 | mpc_name = (1242) Zambesia | alt_names = 1932 HL{{·}}1947 TE 1948 AC{{·}}1967 EF A908 BF | pronounced = | named_after = Zambezi basin [2] {{small|(southern Africa)}} | mp_category = main-belt{{·}}{{small|(middle)}} background [3] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 109.42 yr (39,966 days) | aphelion = 3.2569 AU | perihelion = 2.2201 AU | semimajor = 2.7385 AU | eccentricity = 0.1893 | period = 4.53 yr (1,655 days) | mean_anomaly = 139.42° | mean_motion = {{Deg2DMS|0.2175|sup=ms}} / day | inclination = 10.163° | asc_node = 350.01° | arg_peri = 52.968° | dimensions = {{val|42.16|11.24}} km[5] 47.54 km {{small|(derived)}}[6] {{val|47.594|0.347}} km[7] {{val|47.70|1.6}} km[8] {{val|52.668|0.952}} km[9] {{val|53.70|3.05}} km[10] {{val|62.23|0.79}} km[11] {{val|72.818|22.99}} km[12] | rotation = {{val|15.72|0.14}} h{{efn|name=lcdb-Aznar-2016}} {{val|17.305}} h{{efn|name=lcdb-CALL-2011}} >{{val|24}} h {{small|(poor)}}[13] | albedo = {{val|0.0252|0.0184}}[12] {{val|0.04|0.01}}[10] {{val|0.043|0.001}}[11] {{val|0.045|0.032}}[5] 0.0541 {{small|(derived)}}[6] {{val|0.058|0.010}}[7] {{val|0.0581|0.0040}}[9] {{val|0.0708|0.005}}[8] | spectral_type = C {{small|(assumed)}}[6] | abs_magnitude = 10.10[8][9][11]{{·}}10.40[6][12]{{·}}10.41[10]{{·}}10.87[5] }}1242 Zambesia, provisional designation {{mp|1932 HL}}, is a dark background asteroid from the central regions of the asteroid belt, approximately 48 kilometers in diameter. It was discovered on 28 April 1932, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[31] The asteroid was named for the large Zambezi basin in southern Africa.[2] Orbit and classificationZambesia is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the central main-belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,655 days; semi-major axis of 2.74 AU). Its orbit has an eccentricity of 0.19 and an inclination of 10° with respect to the ecliptic.The asteroid was first observed as {{mp|A908 BF}} at Taunton Observatory ({{small|803}}) in January 1908. The body's observation arc begins at the United States Naval Observatory ({{small|786}}) in February 1908, more than 26 years prior to its official discovery observation at Johannesburg.[31] Physical characteristicsZambesia is an assumed C-type asteroid.[6]Rotation periodIn October 2015, a rotational lightcurve of Zambesia was obtained by a group of Spanish astronomers. Lightcurve analysis gave a rotation period of 15.72 hours with a brightness variation of 0.15 magnitude ({{small|U=2}}).{{efn|name=lcdb-Aznar-2016}} Previous photometric observations gave a divergent period of 17.305 and 24+ hours ({{small|U=1/2}}).[13]{{efn|name=lcdb-CALL-2011}} Diameter and albedoAccording 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, Zambesia measures between 42.16 and 72.818 kilometers in diameter and its surface has an albedo between 0.0252 and 0.0708.[5][7][8][9][10][11][12] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0541 and a diameter of 47.54 kilometers based on an absolute magnitude of 10.4.[6] NamingThis minor planet was named after the Zambezi river valley, partially part of the former British Central Africa Protectorate. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 114}}).[2] The large Zambezi basin stretches across modern Angola, Botswana, Mozambique, Namibia, Zambia and Zimbabwe. Notes{{notelist|refs={{efn|name=lcdb-CALL-2011|1=Anonymous lightcurve (2011) for (1242) Zambesia: rotation period {{val|17.305}} hours with a brightness amplitude of {{val|0.24}} mag. Quality code of 2. Summary figures at the LCDB.}}{{efn|name=lcdb-Aznar-2016|1=Aznar, A.; Garceran, A.C.; Mansego, E.A.; Rodriguez, P.B.; et al. (2016) Minor Planet Bul. 43, 174-181.; rotation period {{val|15.72|0.14}} hours with a brightness amplitude of {{val|0.15|0.01}} mag. Quality code of 2. Summary figures at the LCDB.}}}} References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (1242) Zambesia |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 103 |date = 2003 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1243 |chapter = (1242) Zambesia }} [1][2][3][4][5][6][7][8][9][10][11][12]2. ^1 2 {{cite web |title = 1242 Zambesia (1932 HL) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1242 |accessdate = 4 January 2018}} 3. ^1 2 {{cite web |title = Asteroids and comets rotation curves – (1242) Zambesia |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page3cou.html#001242 |accessdate = 4 January 2018}} 4. ^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 }} 5. ^1 2 {{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 4 January 2018}} 6. ^1 2 3 4 5 6 {{cite web |title = LCDB Data for (1242) Zambesia |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1242%7CZambesia |accessdate = 4 January 2018}} 7. ^1 2 3 4 {{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 }} 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= 4 January 2018}} 9. ^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://sbn.psi.edu/pds/asteroid/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |journal = NASA Planetary Data System |pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |access-date = 4 January 2018 |archive-url = https://web.archive.org/web/20160603231123/http://sbn.psi.edu/pds/asteroid/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |archive-date = 2016-06-03 |dead-url = yes |df = }} 10. ^1 2 3 4 {{Cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = C. |last2 = Nugent |first3 = A. K. |last3 = Mainzer |first4 = E. L. |last4 = Wright |first5 = J. M. |last5 = Bauer |first6 = R. M. |last6 = Cutri |first7 = T. |last7 = Grav |first8 = E. |last8 = Kramer |first9 = S. |last9 = Sonnett |date = October 2017 |title = NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos |journal = The Astronomical Journal |volume = 154 |issue = 4 |page = 10 |bibcode = 2017AJ....154..168M |doi = 10.3847/1538-3881/aa89ec |arxiv = 1708.09504 }} 11. ^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= 4 January 2018}} 12. ^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= 4 January 2018}} }} External links
5 : Background asteroids|Discoveries by Cyril V. Jackson|Minor planets named for places|Named minor planets|Astronomical objects discovered in 1932 |
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