5436 Eumelos

5436 Eumelos /jˈmləs/ is a mid-sized Jupiter trojan from the Greek camp, approximately 38 kilometers (24 miles) in diameter. It was discovered on 20 February 1990, by American astronomers Carolyn and Eugene Shoemaker at the Palomar Observatory in California.[1] The dark Jovian asteroid has been identified as the principal body of the small Eumelos family and is likely elongated in shape with a longer-than-average rotation period of 38.4 hours.[7] It was named after the Greek warrior and charioteer Eumelus from Greek mythology.[1]

5436 Eumelos
Shape model of Eumelos from its lightcurve
Discovery[1]
Discovered byC. S. Shoemaker
E. M. Shoemaker
Discovery sitePalomar Obs.
Discovery date20 February 1990
Designations
(5436) Eumelos
Pronunciation/jˈmləs/[2]
Named after
Εὔμηλος Eymēlos[1]
(Greek mythology)
1990 DK · 1986 XF2
Jupiter trojan[1][3]
Greek[4] · background[5]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc30.51 yr (11,142 d)
Aphelion5.6013 AU
Perihelion4.8019 AU
5.2016 AU
Eccentricity0.0768
11.86 yr (4,333 d)
173.91°
0° 4m 59.16s / day
Inclination7.4329°
253.98°
221.45°
Jupiter MOID0.1684 AU
TJupiter2.9770
Physical characteristics
Mean diameter
37.70±0.33 km[6]
46.30 km[7]
38.41±0.02 h(ambiguous)[8][lower-alpha 1]
0.057 (assumed)[7]
0.086±0.013[6]
C(assumed)[7]
10.40[1][3][6][7]

    Orbit and classification

    Eumelos 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 on its orbit (see Trojans in astronomy). It orbits the Sun at a distance of 4.8–5.6 AU once every 11 years and 10 months (4,333 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.08 and an inclination of 7° with respect to the ecliptic.[3]

    The body's observation arc begins with its first observation as 1986 XF2 at the CERGA Observatory in December 1986, more than three years prior to its official discovery observation at Palomar.[1]

    Eumelos family

    Fernando Roig and Ricardo Gil-Hutton identified Eumelos as the principal body of a small Jovian asteroid family, using the hierarchical clustering method (HCM), which looks for groupings of neighboring asteroids based on the smallest distances between them in the proper orbital element space. According to the astronomers, the Eumelos family belongs to the larger Menelaus clan, an aggregation of Jupiter trojans which is composed of several families, similar to the Flora family in the inner asteroid belt.[9]:9,10

    However this family is not included in David Nesvorný's HCM-analysis from 2014.[10] Instead, Eumelos is listed as a non-family asteroid of the Jovian background population on the Asteroids Dynamic Site (AstDyS) which based on another analysis by Milani and Knežević.[5]

    Naming

    This minor planet was named after Eumelus (Eumelos), son of King Admetus and leader of the Greek contingent from Pherae in the Trojan War. At funeral games for Patroclus, he was the fifth and last in the chariot races competing against Diomedes, Menelaus, Antilochus and Meriones. Though Eumelus came in last, he was awarded by Achilles with the bronze corselet stripped from the Trojan Asteropaios (see table below for the correspondingly named Jupiter trojans).[1] The official naming citation was published by the Minor Planet Center on 12 July 1995 (M.P.C. 25444).[11]

    Physical characteristics

    Euryalos is an assumed C-type asteroid, while the majority of larger Jupiter trojans are D-type asteroids.[7]

    Rotation period

    In 2013, a rotational lightcurve of Eumelos was obtained from photometric observations by Linda French and Lawrence Wasserman at the Anderson Mesa Station of the Lowell Observatory, using its 0.8-meter NURO telescope over three consecutive nights until 1 March 2013. Robert Stephens at the Center for Solar System Studies in Landers, California, then observed this asteroid for five more nights during 10–14 March 2013. Lightcurve analysis gave a well-defined rotation period of 38.41±0.02 hours with a brightness amplitude of 0.68 magnitude, indicative of a non-spherical shape (U=3).[7][8][lower-alpha 1]

    In August 2015, observations by the Kepler space telescope during its K2 mission gave two lightcurves with an alternative period of 21.23±0.37 and 21.276±0.315 hours with a brightness variation of 0.40 and 0.43 magnitude, respectively (U=2/2).[12][13] The Collaborative Asteroid Lightcurve Link (CALL), labels the period determination for this asteroid as ambiguous.[7]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Eumelos measures 37.70 kilometers in diameter and its surface has an albedo of 0.086,[6] while CALL assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 46.30 kilometers based on an absolute magnitude of 10.4.[7]

    100+ largest Jupiter trojans
    Largest Jupiter Trojans by survey(A)
    (mean-diameter in kilometers; YoD: Year of Discovery)
    Designation H WISE IRAS Akari Ln RP V–I YoD Ref
    624 Hektor7.2225233230.99L46.920.9301907list
    617 Patroclus8.19140.362140.92140.85L5102.800.8301906list
    911 Agamemnon7.89131.038166.66185.30L46.590.9801919list
    588 Achilles8.67130.099135.47133.22L47.310.9401906list
    3451 Mentor8.4126.288116.30117.91L57.700.7701984list
    3317 Paris8.3118.790116.26120.45L57.090.9501984list
    1867 Deiphobus8.3118.220122.67131.31L558.660.9301971list
    1172 Äneas8.33118.020142.82148.66L58.710.9501930list
    1437 Diomedes8.3117.786164.31172.60L424.490.8101937list
    1143 Odysseus7.93114.624125.64130.81L410.110.8601930list
    2241 Alcathous8.64113.682114.63118.87L57.690.9401979list
    659 Nestor8.99112.320108.87107.06L415.980.7901908list
    3793 Leonteus8.7112.04686.2687.58L45.620.7801985list
    3063 Makhaon8.4111.655116.14114.34L48.640.8301983list
    1583 Antilochus8.6108.842101.62111.69L431.540.9501950list
    884 Priamus8.81101.09396.29119.99L56.860.9001917list
    1208 Troilus8.99100.477103.34111.36L556.170.7401931list
    1173 Anchises8.8999.549126.27120.49L511.600.7801930list
    2207 Antenor8.8997.65885.1191.32L57.970.9501977list
    2363 Cebriones9.1195.97681.8484.61L520.050.9101977list
    4063 Euforbo8.795.619102.46106.38L48.850.9501989list
    2357 Phereclos8.9494.62594.9098.45L514.390.9601981list
    4709 Ennomos8.591.43380.8580.03L512.280.6901988list
    2797 Teucer8.789.430111.14113.99L410.150.9201981list
    2920 Automedon8.888.574111.01113.11L410.210.9501981list
    15436 Dexius9.187.64685.7178.63L48.970.8701998list
    3596 Meriones9.287.38075.0973.28L412.960.8301985list
    2893 Peiroos9.2386.88487.4686.76L58.960.9501975list
    4086 Podalirius9.185.49586.8985.98L410.430.8701985list
    4060 Deipylos9.384.04379.2186.79L49.300.7601987list
    1404 Ajax9.383.99081.6996.34L429.380.9601936list
    4348 Poulydamas9.582.03270.0887.51L59.910.8401988list
    5144 Achates9.080.95891.9189.85L55.960.9201991list
    4833 Meges8.980.16587.3389.39L414.250.9401989list
    2223 Sarpedon9.4177.48094.63108.21L522.740.8801977list
    4489 Dracius9.076.59592.9395.02L412.580.9501988list
    2260 Neoptolemus9.3176.43571.6581.28L48.180.9501975list
    5254 Ulysses9.276.14778.3480.00L428.720.9701986list
    3708 Socus9.375.66179.5976.75L56.550.9801974list
    2674 Pandarus9.174.26798.10101.72L58.481.0001982list
    3564 Talthybius9.473.73068.9274.11L440.590.9001985list
    4834 Thoas9.172.33186.8296.21L418.190.9501989list
    7641 Cteatus9.471.83968.9775.28L427.770.9801986list
    3540 Protesilaos9.370.22576.8487.66L48.950.9401973list
    11395 Iphinous9.868.97764.7167.78L417.381998list
    4035 Thestor9.668.73368.2366.99L413.470.9701986list
    5264 Telephus9.468.47273.2681.38L49.530.9701991list
    1868 Thersites9.568.16370.0878.89L410.480.9601960list
    9799 Thronium9.668.03364.8772.42L421.520.9101996list
    4068 Menestheus9.567.62562.3768.46L414.400.9501973list
    23135 Pheidas9.966.23058.2968.50L48.690.8602000list
    2456 Palamedes9.365.91691.6699.60L47.240.9201966list
    3709 Polypoites9.165.29799.0985.23L410.041.0001985list
    1749 Telamon9.564.89881.0669.14L416.980.9701949list
    3548 Eurybates9.663.88572.1468.40L48.710.7301973list
    4543 Phoinix9.763.83662.7969.54L438.871.2001989list
    12444 Prothoon9.863.83564.3162.41L515.821996list
    4836 Medon9.563.27767.7378.70L49.820.9201989list
    16070 Charops9.763.19164.1368.98L520.240.9601999list
    15440 Eioneus9.662.51966.4871.88L421.430.9701998list
    4715 Medesicaste9.762.09763.9165.93L58.810.8501989list
    34746 Thoon9.861.68460.5163.63L519.630.9502001list
    38050 Bias9.861.60361.0450.44L418.850.9901998list
    5130 Ilioneus9.760.71159.4052.49L514.770.9601989list
    5027 Androgeos9.659.78657.86n.a.L411.380.9101988list
    6090 Aulis9.459.56874.5381.92L418.480.9801989list
    5648 Axius9.759.29563.91n.a.L537.560.9001990list
    7119 Hiera9.759.15076.4077.29L44000.9501989list
    4805 Asteropaios10.057.64753.1643.44L512.371990list
    16974 Iphthime9.857.34155.4357.15L478.90.9601998list
    4867 Polites9.857.25158.2964.29L511.241.0101989list
    2895 Memnon10.056.70655.67n.a.L57.500.7101981list
    4708 Polydoros9.954.96455.67n.a.L57.520.9601988list
    (21601) 1998 XO8910.054.90955.6756.08L412.650.9701998list
    12929 Periboea9.954.07761.0455.34L59.270.8801999list
    17492 Hippasos10.053.97555.67n.a.L517.751991list
    5652 Amphimachus10.153.92153.1652.48L48.371.0501992list
    2759 Idomeneus9.953.67661.0152.55L432.380.9101980list
    5258 Rhoeo10.253.27550.77n.a.L419.851.0101989list
    (12126) 1999 RM1110.153.202n.a.n.a.L5n.a. ?1999list
    (15502) 1999 NV2710.053.10055.6750.86L515.130.8751999list
    4754 Panthoos10.053.02553.1556.96L527.681977list
    4832 Palinurus10.052.05853.16n.a.L55.321.0001988list
    5126 Achaemenides10.551.92244.2248.57L453.021989list
    3240 Laocoon10.251.69550.77n.a.L511.310.8801978list
    4902 Thessandrus9.851.26361.0471.79L47380.9601989list
    11552 Boucolion10.151.13653.1653.91L532.441993list
    (20729) 1999 XS14310.450.96146.30n.a.L45.721.0001999list
    6545 Leitus10.150.95153.16n.a.L416.260.9101986list
    4792 Lykaon10.150.87053.16n.a.L540.090.9601988list
    21900 Orus10.050.81055.6753.87L413.450.9501999list
    1873 Agenor10.150.79953.7654.38L520.601971list
    5028 Halaesus10.250.77050.77n.a.L424.940.9001988list
    2146 Stentor9.950.75558.29n.a.L416.401976list
    4722 Agelaos10.050.37853.1659.47L518.440.9101977list
    5284 Orsilocus10.150.15953.16n.a.L410.310.9701989list
    11509 Thersilochos10.149.96053.1656.23L517.371990list
    5285 Krethon10.149.60658.5352.61L412.041.0901989list
    4791 Iphidamas10.149.52857.8559.96L59.701.0301988list
    9023 Mnesthus10.149.15150.7760.80L530.661988list
    5283 Pyrrhus9.748.35664.5869.93L47.320.9501989list
    4946 Askalaphus10.248.20952.7166.10L422.730.9401988list
    (22149) 2000 WD4910.248.19050.7750.37L47.841.0902000list
    (32496) 2000 WX18210.248.01750.7751.63L523.340.9502000list
    5120 Bitias10.247.98750.77n.a.L515.210.7801988list
    12714 Alkimos10.147.81961.0454.62L428.481991list
    7352 Hypsenor9.947.73155.67 47.07L56480.8501994list
    1870 Glaukos10.647.64942.23n.a.L55.991971list
    4138 Kalchas10.146.46253.1661.04L429.20.8101973list
    (23958) 1998 VD3010.246.00150.7747.91L45620.9901998list
    4828 Misenus10.445.95446.30 43.22L512.870.9201988list
    4057 Demophon10.145.68353.16n.a.L429.821.0601985list
    4501 Eurypylos10.445.52446.30n.a.L46.051989list
    4007 Euryalos10.345.51548.4853.89L46.391973list
    5259 Epeigeus10.344.74142.5944.42L418.421989list
    30705 Idaios10.444.54646.30n.a.L515.741977list
    16560 Daitor10.743.86151.4243.38L51991list
    (15977) 1998 MA1110.443.53046.3051.53L52500.9061998list
    7543 Prylis10.642.89342.23n.a.L417.801973list
    4827 Dares10.542.77044.22n.a.L519.001988list
    1647 Menelaus10.542.71644.22n.a.L417.740.8661957list
    (A) Used sources: WISE/NEOWISE catalog (NEOWISE_DIAM_V1 PDS, Grav, 2012); IRAS data (SIMPS v.6 catalog); and Akari catalog (Usui, 2011); RP: rotation period and V–I (color index) taken from the LCDB

    Note: missing data was completed with figures from the JPL SBDB (query) and from the LCDB (query form) for the WISE/NEOWISE and SIMPS catalogs, respectively. These figures are given in italics. Also, listing is incomplete above #100.

    Notes

    1. Lightcurve plots of (5436) Eumelos from Mar 2013 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is not available (lightcurve rating at the CS3 website). Summary figures at the LCDB and CS3.

    References

    1. "5436 Eumelos (1990 DK)". Minor Planet Center. Retrieved 29 June 2018.
    2. 'Eumelus' in Noah Webster (1884) A Practical Dictionary of the English Language
    3. "JPL Small-Body Database Browser: 5436 Eumelos (1990 DK)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 29 June 2018.
    4. "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 29 June 2018.
    5. "Asteroid (5436) Eumelos – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 June 2018.
    6. Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
    7. "LCDB Data for (5436) Eumelos". Asteroid Lightcurve Database (LCDB). Retrieved 29 June 2018.
    8. French, Linda M.; Stephens, Robert, D.; Coley, Daniel R.; Wasserman, Lawrence H.; Vilas, Faith; La Rocca, Daniel (October 2013). "A Troop of Trojans: Photometry of 24 Jovian Trojan Asteroids" (PDF). Minor Planet Bulletin. 40 (4): 198–203. Bibcode:2013MPBu...40..198F. ISSN 1052-8091. Archived from the original (PDF) on 24 February 2020. Retrieved 29 June 2018.{{cite journal}}: CS1 maint: multiple names: authors list (link)
    9. Roig, F.; Ribeiro, A. O.; Gil-Hutton, R. (June 2008). "Taxonomy of asteroid families among the Jupiter Trojans: comparison between spectroscopic data and the Sloan Digital Sky Survey colors". Astronomy and Astrophysics. 483 (3): 911–931. arXiv:0712.0046. Bibcode:2008A&A...483..911R. doi:10.1051/0004-6361:20079177. S2CID 118361725.
    10. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
    11. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 June 2018.
    12. Ryan, Erin Lee; Sharkey, Benjamin N. L.; Woodward, Charles E. (March 2017). "Trojan Asteroids in the Kepler Campaign 6 Field". The Astronomical Journal. 153 (3): 12. Bibcode:2017AJ....153..116R. doi:10.3847/1538-3881/153/3/116. S2CID 125570438.
    13. Szabó, Gy. M.; Pál, A.; Kiss, Cs.; Kiss, L. L.; Molnár, L.; Hanyecz, O.; et al. (March 2017). "The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids". Astronomy and Astrophysics. 599: 13. arXiv:1609.02760. Bibcode:2017A&A...599A..44S. doi:10.1051/0004-6361/201629401. S2CID 119275951.
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