| 词条 | 11351 Leucus |
| 释义 |
| minorplanet = yes | name = 11351 Leucus | background = #C2FFFF | image = | image_size = | caption = | discovery_ref = [1] | discoverer = SCAP | discovery_site = Beijing Xinglong Obs. | discovered = 12 October 1997 | mpc_name = (11351) Leucus | alt_names = {{mp|1997 TS|25}}{{·}}{{mp|1996 VP|39}} | pronounced = {{IPAc-en|'|lj|u:|k|ə|s}}{{·}}{{Respell|LEEW|kəs}} | named_after = {{nowrap|Leucus {{small|(Greek mythology)}}[1]}} | mp_category = Jupiter trojan [1] Greek [5]{{·}}background [6] | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 20.57 yr (7,515 d) | aphelion = 5.6224 AU | perihelion = 4.9513 AU | semimajor = 5.2869 AU | eccentricity = 0.0635 | period = 12.16 yr (4,440 d) | mean_anomaly = 258.08° | mean_motion = {{Deg2DMS|0.0811|sup=ms}} / day | inclination = 11.556° | asc_node = 251.08° | arg_peri = 160.85° | jupiter_moid = 0.1005 AU | tisserand = 2.9550 | mean_diameter = {{val|34.16|0.65|u=km}}[8] {{val|42.16|4.0|u=km}}[9] | rotation = {{val|515|5|ul=h}}[10]{{efn|name=Lightcurve-plot-CS3}} | albedo = {{val|0.0627|0.014}}[9] {{val|0.079|0.013}}[8] | spectral_type = D {{small|(assumed)}}[13] B–V {{=}} {{val|0.739|0.044}}[14] V–R {{=}} {{val|0.498|0.044}}[14] V–I {{=}} {{val|0.900|0.057}}[14] | abs_magnitude = 10.7[1][8][20] }}11351 Leucus ({{IPAc-en|'|lj|u:|k|ə|s}} {{Respell|LEEW|kəs}}), provisional designation {{mp|1997 TS|25}}, is a mid-sized Jupiter trojan from the Greek camp, approximately {{convert|40|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It is a target of the Lucy mission, scheduled for a fly by in April 2028.[13][22] The assumed D-type asteroid is an exceptionally slow rotator with a rotation period of 515 hours.[20] It was discovered on 12 October 1997 by the Beijing Schmidt CCD Asteroid Program (SCAP) at Xinglong Station in the Chinese province of Hebei, and later named after the Achaean warrior Leucus from Greek mythology.[1] Orbit and classificationLeucus is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at Jupiter's {{L4}} Lagrangian point, 60° ahead of its orbit {{cross reference|(see Trojans in astronomy)}}. It is also a non-family asteroid in the Jovian background population.[6]It orbits the Sun at a distance of 5.0–5.6 AU once every 12 years and 2 months (4,440 days; semi-major axis of 5.29 AU). Its orbit has an eccentricity of 0.06 and an inclination of 12° with respect to the ecliptic. The body's observation arc begins with a precovery taken at the Siding Spring Observatory in July 1982, more than 15 years prior to its official discovery observation at Xinglong.[1] Lucy mission targetLeucus is planned to be visited by the Lucy spacecraft which will launch in 2021. The fly by is scheduled for 18 April 2028, and will approach the asteroid to a distance of 1000 kilometers at a velocity of 5.9 kilometers per second.[13] The mission's targets with their flyby dates are:[13][22][1]
Physical characteristicsLeucus is an assumed D-type asteroid,[13] which is the dominant spectral type among the Jovian asteroids, with the remainder being mostly carbonaceous C-type and primitive P-type asteroids. Slow rotatorDuring spring 2013, a rotational lightcurve of Leucus was obtained from photometric observations made by astronomers Robert Stephens and Daniel Coley at the Center for Solar System Studies (CS3), California, using a 0.35/0.4-meter Schmidt-Cassegrain telescope. The lightcurve showed an exceptionally slow rotation period of 513.7 hours with a brightness variation of 0.53 in magnitude ({{small|U=2+}}). No evidence of a non-principal axis rotation (NPAR) was found.[10]{{efn|name=Lightcurve-plot-CS3}} It is one of the slowest rotators known to exist. In preparation for the planned visit by the Lucy spacecraft, Leucus was once again observed by astronomers Marc Buie at SwRI and Stefano Mottola at DLR in 2016. The obtained bimodal lightcurve gave a somewhat shorter period of 440 hours and an amplitude of 0.7 magnitude.[34] Diameter and albedoAccording to the surveys carried out by the Infrared Astronomical Satellite IRAS, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Leucus has a low albedo of 0.06 and 0.08, with a diameter of 42.1 and 34.2 kilometers, respectively.[8][9] The Collaborative Asteroid Lightcurve Link derives a lower albedo of 0.05 and a diameter of 42.1 kilometers, in accordance with the result obtained by IRAS.[20] {{Largest Jupiter trojans}}NamingThis minor planet was named from Greek mythology, after the Achaean warrior Leucus in Homer's Iliad. He was a companion of Odysseus.[1] Leucus was killed during the Trojan War by Antiphus, one of the fifty sons of King Priam of Troy.[2] The approved naming citation was published by the Minor Planet Center on 22 February 2016 ({{small|M.P.C. 98711}}).[40] Notes{{notelist|refs={{efn|name=Lightcurve-plot-CS3|1=lightcurve plot of 11351 Leucus by Daniel Coley at the Center for Solar System Studies from 29 March to 1 May 2013, giving a period of {{val|513.7|1.3}} hours. Quality code of 2}}}} References1. ^https://www.hou.usra.edu/meetings/lpsc2017/pdf/2025.pdf [3][4][5][6][7][8][9][10][11][12][13][14]2. ^Homer, Iliad, 4. 491 3. ^1 2 3 4 5 6 7 {{cite web |title = 11351 Leucus (1997 TS25) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=11351 |accessdate = 22 June 2018}} 4. ^1 {{cite web |title = List of Jupiter Trojans |work = Minor Planet Center |first3 = V. |last3 = Carruba |date = 1 June 2018 |url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html |accessdate = 22 June 2018}} 5. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 22 June 2018}} 6. ^1 2 3 4 {{cite journal |first1 = T. |last1 = Grav |first2 = A. K. |last2 = Mainzer |first3 = J. M. |last3 = Bauer |first4 = J. R. |last4 = Masiero |first5 = C. R. |last5 = Nugent |date = November 2012 |title = WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759...49G |journal = The Astrophysical Journal |volume = 759 |issue = 1 |page = 10 |bibcode = 2012ApJ...759...49G |doi = 10.1088/0004-637X/759/1/49 |arxiv = 1209.1549 |access-date= 22 June 2018}} (online catalog) 7. ^1 2 {{cite web |title = Asteroid (11351) Leucus – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=11351&pc=1.1.6 |access-date= 22 June 2018}} 8. ^1 2 3 {{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 |bibcode = 2004PDSS...12.....T |accessdate = 15 June 2018}} 9. ^1 2 {{cite web |title = NASA announces five Discovery proposals selected for further study |date = 30 September 2015 |author1 = Casey Dreier |author2 = Emily Lakdawalla |publisher = The Planetary Society |url = http://www.planetary.org/blogs/casey-dreier/2015/09301336-discovery-downselect.html |accessdate = 12 April 2017}} 10. ^1 2 3 4 5 {{Cite journal |first1 = H. F. |last1 = Levison |first2 = C. |last2 = Olkin |first3 = K. S. |last3 = Noll |first4 = S. |last4 = Marchi |first5 = |last5 = Lucy Team |date = March 2017 |title = Lucy: Surveying the Diversity of the Trojan Asteroids: The Fossils of Planet Formation |url = https://www.hou.usra.edu/meetings/lpsc2017/pdf/2025.pdf |journal = 48th Lunar and Planetary Science Conference |bibcode = 2017LPI....48.2025L |access-date= 13 April 2017}} 11. ^1 {{Cite journal |first1 = Marc W. |last1 = Buie |first2 = Amanda Marie |last2 = Zangari |first3 = Simone |last3 = Marchi |first4 = Stefano |last4 = Mottola |first5 = Harold F. |last5 = Levison |date = October 2016 |title = Ground-based characterization of Leucus and Polymele, two fly-by targets of the Lucy Discovery mission |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016DPS....4820806B |journal = American Astronomical Society |bibcode = 2016DPS....4820806B |access-date= 13 April 2017}} 12. ^1 2 3 {{cite web |title = LCDB Data for (11351) Leucus |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=11351%7CLeucus |accessdate = 22 June 2018}} 13. ^1 2 {{Cite journal |first1 = Linda M. |last1 = French |first2 = Robert, D. |last2 = Stephens |first3 = Daniel R. |last3 = Coley |first4 = Lawrence H. |last4 = Wasserman |first5 = Faith |last5 = Vilas |first6 = Daniel |last6 = La Rocca |date = October 2013 |title = A Troop of Trojans: Photometry of 24 Jovian Trojan Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..198F |journal = The Minor Planet Bulletin |volume = 40 |issue = 4 |pages = 198–203 |issn = 1052-8091 |bibcode = 2013MPBu...40..198F |access-date= 22 June 2018}} 14. ^1 2 3 {{Cite journal |first1 = O. R. |last1 = Hainaut |first2 = H. |last2 = Boehnhardt |first3 = S. |last3 = Protopapa |date = October 2012 |title = Colours of minor bodies in the outer solar system. II. A statistical analysis revisited |url = https://arxiv.org/pdf/1209.1896.pdf |journal = Astronomy and Astrophysics |volume = 546 |page = 20 |bibcode = 2012A&A...546A.115H |doi = 10.1051/0004-6361/201219566 |arxiv = 1209.1896 |access-date= 22 June 2018}} }} External links
7 : Jupiter trojans (Greek camp)|Discoveries by SCAP|Minor planets named from Greek mythology|Named minor planets|Slow rotating minor planets|Minor planets to be visited by spacecraft|Astronomical objects discovered in 1997 |
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