| 词条 | 1268 Libya |
| 释义 |
| minorplanet = yes | name = 1268 Libya | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discoverer = C. Jackson | discovery_site = Johannesburg Obs. | discovered = 29 April 1930 | mpc_name = (1268) Libya | alt_names = 1930 HJ{{·}}1929 EA 1930 KN | pronounced = | named_after = Libya {{small|(country)}} [2] | mp_category = main-belt{{·}}{{small|(outer)}} Hilda [4] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 87.09 yr (31,811 days) | aphelion = 4.3787 AU | perihelion = 3.5686 AU | semimajor = 3.9737 AU | eccentricity = 0.1019 | period = 7.92 yr (2,893 days) | mean_anomaly = 157.54° | mean_motion = {{Deg2DMS|0.1244|sup=ms}} / day | inclination = 4.4272° | asc_node = 351.00° | arg_peri = 119.43° | jupiter_moid = 0.7451 AU | dimensions = {{val|93.44|1.42}} km[6] {{val|94.10|2.3}} km[7] {{val|96.708|0.848}} km[8] | rotation = {{val|14.05}} h[9] {{val|14.05008}} h[10] | albedo = {{val|0.043|0.003}}[8] {{val|0.0449|0.002}}[7] {{val|0.046|0.002}}[6] | spectral_type = Tholen {{=}} P [4] B–V {{=}} 0.663 U–B {{=}} 0.228 | abs_magnitude = 9.12[4][6][7]{{·}}{{val|9.19|0.33}}[22] }}1268 Libya, provisional designation {{mp|1930 HJ}}, is a dark Hildian asteroid from the outer regions of the asteroid belt, approximately 95 kilometers in diameter. It was discovered on 29 April 1930, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg, South Africa.[23] The asteroid was named for the country Libya.[2] Orbit and classificationLibya belongs to the dynamical Hilda group of asteroids, which reside in, or closely inside the 3:2 orbital resonance with the giant planet Jupiter at 4.0 AU.[4] However, the asteroid belongs to the background population as it is not a member of any known asteroid family within the Hildian group.[26]Libya orbits the Sun in the outer main-belt at a distance of 3.6–4.4 AU once every 7 years and 11 months (2,893 days). Its orbit has an eccentricity of 0.10 and an inclination of 4° with respect to the ecliptic. The asteroid was first identified as {{mp|1929 EA}} at Uccle Observatory in March 1929, and its observation arc begins with its official discovery observation at Johannesburg in 1930.[23]Physical characteristicsIn the Tholen classification, Libya is a primitive P-type asteroid. Rotation periodIn June 1994, a rotational lightcurve of Libya was obtained from photometric observations by Swedish astronomer Mats Dahlgren (see {{MoMP|6945|6945}}) at ESO's La Silla Observatory using the Dutch 0.9-metre Telescope. Lightcurve analysis gave a well-defined rotation period of 14.05 hours with a brightness variation of 0.08 magnitude ({{small|U=3}}).[9] In October 2011, observations by French amateur astronomer René Roy also gave a period of 14.05 hours and a low amplitude of 0.06 magnitude ({{small|U=n.a.}}). A low brightness amplitude typically indicates that the body has a spheroidal rather than an elongated or irregular shape. 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, Libya measures between 93.44 and 96.708 kilometers in diameter and its surface has an albedo between 0.043 and 0.046.[6][7][8] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0449 and a diameter of 94.10 kilometers based on an absolute magnitude of 9.12.[4] NamingThis minor planet was named after the North African country of Libya, bordering the Mediterranean Sea. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 116}}).[2] References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (1268) Libya |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 105 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1269 |chapter = (1268) Libya }} [1][2][3][4][5][6][7][8][9][10]2. ^1 2 {{cite web |title = 1268 Libya (1930 HJ) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1268 |accessdate = 19 September 2017}} 3. ^1 {{cite web |title = Asteroids and comets rotation curves – (1268) Libya |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page3cou.html#001268 |accessdate = 19 September 2017}} 4. ^1 2 3 {{cite journal |display-authors = 6 |first1 = T. |last1 = Grav |first2 = A. K. |last2 = Mainzer |first3 = J. |last3 = Bauer |first4 = J. |last4 = Masiero |first5 = T. |last5 = Spahr |first6 = R. S. |last6 = McMillan |first7 = R. |last7 = Walker |first8 = R. |last8 = Cutri |first9 = E. |last9 = Wright |first10 = P. R. |last10 = Eisenhardt |first11 = E. |last11 = Blauvelt |first12 = E. |last12 = DeBaun |first13 = D. |last13 = Elsbury |first14 = T. |last14 = Gautier |first15 = S. |last15 = Gomillion |first16 = E. |last16 = Hand |first17 = A. |last17 = Wilkins |date = January 2012 |title = WISE/NEOWISE Observations of the Hilda Population: Preliminary Results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...744..197G |journal = The Astrophysical Journal |volume = 744 |issue = 2 |page = 15 |bibcode = 2012ApJ...744..197G |doi = 10.1088/0004-637X/744/2/197 |arxiv = 1110.0283 |access-date= 19 September 2017}} 5. ^1 {{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 19 September 2017}} 6. ^1 2 3 4 5 {{cite web |title = LCDB Data for (1268) Libya |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1268%7CLibya |accessdate = 19 September 2017}} 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= 19 September 2017}} 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 = 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= 19 September 2017}} 9. ^1 2 {{Cite journal |display-authors = 6 |first1 = M. |last1 = Dahlgren |first2 = J. F. |last2 = Lahulla |first3 = C.-I. |last3 = Lagerkvist |first4 = J. |last4 = Lagerros |first5 = S. |last5 = Mottola |first6 = A. |last6 = Erikson |first7 = M. |last7 = Gonano-Beurer |first8 = M. |last8 = Di Martino |date = June 1998 |title = A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1998Icar..133..247D |journal = Icarus |volume = 133 |issue = 2 |pages = 247–285 |bibcode = 1998Icar..133..247D |doi = 10.1006/icar.1998.5919 |access-date= 19 September 2017}} 10. ^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= 19 September 2017}} }} External links
6 : Hilda asteroids|Discoveries by Cyril V. Jackson|Minor planets named for places|Named minor planets|P-type asteroids (Tholen)|Astronomical objects discovered in 1930 |
| 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。