(13366) 1998 US24
{{Use dmy dates|date=July 2018}}
{{DISPLAYTITLE:{{mp|(13366) 1998 US|24}}}}
{{Infobox planet
| minorplanet = yes
| name = {{mp|(13366) 1998 US|24}}
| background = #C2FFFF
| image =
| image_size =
| caption =
| discoverer = LONEOS
| discovery_site = Anderson Mesa
| discovered = 18 October 1998
| mpc_name = (13366) {{mp|1998 US|24}}
| alt_names = {{mp|1998 US|24}}{{·}}{{mp|1996 RX|29}}
| pronounced =
| named_after =
| mp_category = Jupiter trojan
{{nowrap|Greek{{·}}background}}
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 64.27 yr (23,476 d)
| aphelion = 5.7685 AU
| perihelion = 4.6895 AU
| semimajor = 5.2290 AU
| eccentricity = 0.1032
| period = 11.96 yr (4,367 d)
| mean_anomaly = 193.23°
| mean_motion = {{Deg2DMS|0.0824|sup=ms}} / day
| inclination = 6.6365°
| asc_node = 96.296°
| arg_peri = 355.47°
| jupiter_moid = 0.3771 AU
| tisserand = 2.9760
| mean_diameter = {{val|33.30|2.87|ul=km}}
| rotation = {{val|400|105|ul=h}}
| albedo = {{val|0.058|0.016}}
| spectral_type = C {{small|(assumed)}}
| abs_magnitude = 11.10
11.2
11.3
}}
{{mp|(13366) 1998 US|24}} (provisional designation {{mp|1998 US|24}}) is a Jupiter trojan from the Greek camp, approximately {{convert|33|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 18 October 1998, by astronomers with the Lowell Observatory Near-Earth-Object Search at the Anderson Mesa Station near Flagstaff, Arizona, in the United States. The dark Jovian asteroid is a slow rotator with a long rotation period of potentially 400 hours. It has not been named since its numbering in January 2000.
Orbit and classification
{{mp|1998 US|24}} is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant'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 4.7–5.8 AU once every 11 years and 12 months (4,367 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.10 and an inclination of 7° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Palomar Observatory in February 1954, more than 44 years prior to its official discovery observation at Anderson Mesa.
Numbering and naming
This minor planet was numbered by the MPC on 24 January 2000 ({{small|M.P.C. 37586}}). As of 2018, it has not been named.
Physical characteristics
{{mp|1998 US|24}} is an assumed C-type asteroid, while most larger Jupiter trojans are D-types.
= Rotation period =
In August 2015, a first rotational lightcurve of {{mp|1998 US|24}} was obtained from photometric observations by the Kepler space telescope during its K2 mission. Lightcurve analysis gave a rotation period of {{val|400|105}} hours with a brightness variation of 0.23 magnitude ({{small|U=2-}}). One month later, a second, lower-rated lightcurve by Kepler determined an alternative period of {{val|522|36}} hours with an amplitude of 0.20 ({{small|U=1+}}). As of 2018, no secure period of this slow rotator has yet been obtained.
= Diameter and albedo =
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, {{mp|1998 US|24}} measures 33.30 kilometers in diameter and its surface has an albedo of 0.058, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 32.03 kilometers based on an absolute magnitude of 11.2.
{{Largest Jupiter trojans}}
References
{{reflist|30em|refs=
|type = 2018-05-21 last obs.
|title = JPL Small-Body Database Browser: 13366 (1998 US24)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2013366
|publisher = Jet Propulsion Laboratory
|accessdate = 4 July 2018}}
|title = 13366 (1998 US24)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=13366
|accessdate = 4 July 2018}}
|title = List of Jupiter Trojans
|work = Minor Planet Center
|first3 = V. |last3 = Carruba
|date = 1 July 2018
|url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html
|accessdate = 4 July 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 4 July 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=13366 online catalog])
|title = Asteroid (13366) 1998 US24 – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=13366&pc=1.1.6
|access-date= 4 July 2018}}
|title = LCDB Data for (13366)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=13366%7C
|accessdate = 4 July 2018}}
|first1 = Erin Lee |last1 = Ryan
|first2 = Benjamin N. L. |last2 = Sharkey
|first3 = Charles E. |last3 = Woodward
|date = March 2017
|title = Trojan Asteroids in the Kepler Campaign 6 Field
|journal = The Astronomical Journal
|volume = 153
|issue = 3
|page = 12
|bibcode = 2017AJ....153..116R
|doi = 10.3847/1538-3881/153/3/116|s2cid = 125570438
|doi-access= free
}}
|display-authors = 6
|first1 = Gy. M. |last1 = Szabó
|first2 = A. |last2 = Pál
|first3 = Cs. |last3 = Kiss
|first4 = L. L. |last4 = Kiss
|first5 = L. |last5 = Molnár
|first6 = O. |last6 = Hanyecz
|first7 = E. |last7 = Plachy
|first8 = K. |last8 = Sárneczky
|first9 = R. |last9 = Szabó
|date = March 2017
|title = The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids
|journal = Astronomy and Astrophysics
|volume = 599
|page = 13
|bibcode = 2017A&A...599A..44S
|doi = 10.1051/0004-6361/201629401
|arxiv = 1609.02760|s2cid = 119275951 }}
}}
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://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=13366 Asteroid (13366) 1998 US24] at the Small Bodies Data Ferret
- {{AstDys|13366}}
- {{JPL small body|id=2013366}}
{{Minor planets navigator |13365 Tenzinyama |number=13366 |PageName={{mp|(13366) 1998 US|24}} |13367 Jiří }}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:1998 US24}}