11351 Leucus
{{Use dmy dates|date=June 2018}}
{{Infobox planet
| minorplanet = yes
| name = 11351 Leucus
| background = #C2FFFF
| image = 11351 Leucus lightcurve shape model 2020.jpg
| image_scale =
| caption = Shape model of Leucus viewed from multiple orthogonal perspectives
| 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}}Noah Webster (1884) A Practical Dictionary of the English Language
| named_after = {{nowrap|Leucus {{small|(Greek mythology)}}}}
| mp_category = Jupiter trojan
Greek{{·}}background
| epoch = 25 February 2023 (JD 2460000.5)
| uncertainty = 0
| earliest_precovery_date = 25 July 1982
| aphelion = 5.652 AU
| perihelion = 4.953 AU
| semimajor = 5.302 AU
| eccentricity = 0.0659
| period = 12.21 yr (4,460 d)
| mean_anomaly = 43.784°
| mean_motion = {{Deg2DMS|0.0807243|sup=ms}} / day
| inclination = 11.546°
| asc_node = 251.087°
| arg_peri = 160.955°
| jupiter_moid = 0.0942 AU
| tisserand = 2.955
| dimensions = {{val|60.8|x|39.2|x|27.8}} km
| mean_diameter = {{val|41|0.7|u=km}} (surface equivalent)
| rotation = {{val|445.683|0.007|ul=h}}
| pole_ecliptic_lat = +{{val|77|u=°}}
| pole_ecliptic_lon = {{val|208|u=°}}
| axial_tilt = {{val|13|u=°}} (wrt ecliptic)
{{val|10|u=°}} (wrt orbit)
| albedo = {{val|0.043|0.002}}
| spectral_type = D
B–V {{=}} {{val|0.739|0.044}}
V–R {{=}} {{val|0.498|0.044}}
V–I {{=}} {{val|0.900|0.057}}
| abs_magnitude = {{val|10.979|0.037}}
}}
11351 Leucus {{IPAc-en|'|lj|u:|k|ə|s}} 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 flyby in April 2028. The assumed D-type asteroid is an exceptionally slow rotator with a rotation period of 466 hours. 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.
Orbit and classification
Leucus is a dark Jupiter trojan 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 {{crossreference|(see Trojans in astronomy)}}. It is also a non-family asteroid in the Jovian background population.
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.
Exploration
= ''Lucy'' mission target =
Leucus is planned to be visited by the Lucy spacecraft, which launched in 2021. The flyby is scheduled for 18 April 2028, and will approach the asteroid to a distance of {{cvt|1000|km|mi}} at a relative velocity of {{cvt|5.9|km/s|mph}}.
Physical characteristics
File:Leucus occultations shape model fit 2017-2019.jpg events from 2017 to 2019, each with a shape model overlaid to fit the chords.]]
Leucus is a D-type asteroid, which is the dominant spectral type among the Jupiter trojans, with the remainder being mostly carbonaceous C-type and primitive P-type asteroids.
= Slow rotator =
During 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. 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.
= Diameter and albedo =
According 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. 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.
Naming
This minor planet was named from Greek mythology, after the Achaean warrior Leucus in Homer's Iliad. He was a companion of Odysseus. Leucus was killed during the Trojan War by Antiphus, one of the fifty sons of King Priam of Troy.Homer, Iliad, 4. 491 The approved naming citation was published by the Minor Planet Center on 22 February 2016 ({{small|M.P.C. 98711}}).
References
{{reflist|30em|refs=
|type = 2017-06-07 last obs.
|title = JPL Small-Body Database Browser: 11351 Leucus (1997 TS25)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011351
|publisher = Jet Propulsion Laboratory
|accessdate = 22 June 2018}}
|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}}
|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}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 22 June 2018}}
|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
|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
|s2cid = 119101711
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-6?-source=J/ApJ/759/49/table1&MPC=11351 online catalog])
|title = Asteroid (11351) Leucus – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=11351&pc=1.1.6
|access-date= 22 June 2018}}
|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
|volume = 12
|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode = 2004PDSS...12.....T
|accessdate = 15 June 2018}}
|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}}
|first1 = H. F. |last1 = Levison
|first2 = C. |last2 = Olkin
|first3 = K. S. |last3 = Noll
|first4 = S. |last4 = Marchi
|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
|issue = 1964
|pages = 2025
|bibcode = 2017LPI....48.2025L
|access-date= 13 April 2017}}
|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
|journal = American Astronomical Society
|volume = 48
|pages = 208.06
|bibcode = 2016DPS....4820806B
}}
|title = LCDB Data for (11351) Leucus
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11351%7CLeucus
|accessdate = 22 June 2018}}
|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
|journal = The Minor Planet Bulletin
|volume = 40
|issue = 4
|pages = 198–203
|issn = 1052-8091
|bibcode = 2013MPBu...40..198F
}}
|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
|journal = Astronomy and Astrophysics
|volume = 546
|page = 20
|bibcode = 2012A&A...546A.115H
|doi = 10.1051/0004-6361/201219566
|arxiv = 1209.1896
|s2cid = 54776793
}}
|first1 = Stefano |last1 = Mottola
|first2 = Stephan |last2 = Hellmich
|first3 = Marc W. |last3 = Buie
|first4 = Amanda M. |last4 = Zangari
|first5 = Simone |last5 = Marchi
|first6 = Michael E. |last6 = Brown
|first7 = Harold F. |last7 = Levison
|title = Convex Shape and Rotation Model of Lucy Target (11351) Leucus from Lightcurves and Occultations
|journal = The Planetary Science Journal
|date = December 2020
|volume = 1
|issue = 3
|id = 73
|pages = 14
|doi-access = free
|doi = 10.3847/PSJ/abb942
|arxiv = 2009.08951
|bibcode = 2020PSJ.....1...73M
|s2cid = 221802440}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs010001.html Discovery Circumstances: Numbered Minor Planets (10001)-(15000)] – Minor Planet Center
- [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=11351+Leucus Asteroid 11351 Leucus] at the Small Bodies Data Ferret
- {{AstDys|11351}}
- {{JPL small body}}
{{Minor planets navigator|11350 Teresa|number=11351|11352 Koldewey}}
{{Small Solar System bodies}}
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Category:Jupiter trojans (Greek camp)
Category:Slow rotating minor planets
Category:Minor planets to be visited by spacecraft