4035 Thestor

Last updated

4035 Thestor
Discovery [1]
Discovered by K. Suzuki
T. Urata
Discovery site Toyota Obs.
Discovery date22 November 1986
Designations
(4035) Thestor
Named after
Thestor [2]
(Greek mythology)
1986 WD ·1973 SR4
1973 UF6
Jupiter trojan [1] [3] [4]
Greek [5] [6]  · background [6]
Adjectives Thestorian
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 44.64 yr (16,306 d)
Aphelion 5.5799 AU
Perihelion 4.9899 AU
5.2849 AU
Eccentricity 0.0558
12.15 yr (4,438 d)
213.24°
0° 4m 51.96s / day
Inclination 12.130°
233.73°
197.56°
Jupiter  MOID 0.0243 AU
TJupiter 2.9520
Physical characteristics
66.99±4.45  km [7]
68.23 km(derived) [4]
68.46±5.4 km [8]
68.73±1.24 km [9]
13.467±0.08  h [10]
13.475±0.156 h [11]
13.49±0.20 h [12]
13.52±0.08 h [10]
0.054±0.008 [9]
0.0548(derived) [4]
0.0718±0.013 [8]
0.076±0.010 [7]
C (assumed) [4]
V–I = 0.970±0.031 [4]
9.30 [7]
9.6 [1] [3] [4] [9]
9.82±0.46 [13]

    4035 Thestor, provisional designation: 1986 WD, is a large Jupiter trojan from the Greek camp, approximately 68 kilometers (42 miles) in diameter. It was discovered on 22 November 1986, by Japanese astronomers Kenzo Suzuki and Takeshi Urata at the Toyota Observatory ( 881 ) in Toyota, Japan. [1] The assumed C-type asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 13.5 hours. [4] Of more than half a million numbered minor planets, it has been the second-lowest numbered body without a name, until May 2021, when it was named after Thestor, a grandson of Apollo from Greek mythology. [2]

    Contents

    Classification and orbit

    Thestor is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population. [6] [14]

    It orbits the Sun at a distance of 5.0–5.6  AU once every 12 years and 2 months (4,438 days; semi-major axis of 5.28 AU). Its orbit has an eccentricity of 0.06 and an inclination of 12° with respect to the ecliptic. [3] The body's observation arc begins with its first observation as 1973 SR4 at Crimea–Nauchnij in September 1973, or 13 years prior to its official discovery observation at Toyota, Japan. [1]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 22 March 1989 ( M.P.C. 14337). [15] On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN), after Thestor from Greek mythology, who was a grandson of Apollo and the father of Calchas. [2]

    Before Thestor was named, it belonged to a small group of only 8 unnamed minor planets with a designated number smaller than 5000. (All of them are Jupiter trojans or near-Earth asteroids). Since then, several have already been named:

    Physical characteristics

    Thestor is an assumed, carbonaceous C-type asteroid, which is in line with the body's albedo (see below), while its V–I color index of 0.93 agrees with that of most Jovian D-type asteroids. [4]

    Rotation period

    In October 2009, a rotational lightcurve was obtained from photometric observations by astronomer Stefano Mottola at the Calar Alto Observatory in Spain. It gave a well-defined rotation period of 13.467±0.08 hours with a brightness variation of 0.21 in magnitude ( U=3 ), superseding a period of 13.52 hours and an amplitude of more than 0.20 previously measured with the ESO 1-metre telescope at La Silla Observatory in May 1991 ( U=3 ). [10]

    In August 2015, photometric observations of Thestor by the Kepler space observatory during its K2 mission gave a concurring period of 13.475 and 13.49 hours with a brightness amplitude of 0.18 and 0.17 magnitude observations ( U=2+/2+ ). [4] [11] [12]

    Diameter and albedo

    According 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, the asteroid measures between 66.99 and 68.73 kilometers in diameter and its surface has an albedo between 0.054 and 0.076. [8] [7] [9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0548 and a diameter of 68.23 kilometers based on an absolute magnitude of 9.6. [4]

    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 YoDRef
    624 Hektor 7.2225233230.99L46.920.9301907 list
    617 Patroclus 8.19140.362140.92140.85L5102.800.8301906 list
    911 Agamemnon 7.89131.038166.66185.30L46.590.9801919 list
    588 Achilles 8.67130.099135.47133.22L47.310.9401906 list
    3451 Mentor 8.4126.288116.30117.91L57.700.7701984 list
    3317 Paris 8.3118.790116.26120.45L57.090.9501984 list
    1867 Deiphobus 8.3118.220122.67131.31L558.660.9301971 list
    1172 Äneas 8.33118.020142.82148.66L58.710.9501930 list
    1437 Diomedes 8.3117.786164.31172.60L424.490.8101937 list
    1143 Odysseus 7.93114.624125.64130.81L410.110.8601930 list
    2241 Alcathous 8.64113.682114.63118.87L57.690.9401979 list
    659 Nestor 8.99112.320108.87107.06L415.980.7901908 list
    3793 Leonteus 8.7112.04686.2687.58L45.620.7801985 list
    3063 Makhaon 8.4111.655116.14114.34L48.640.8301983 list
    1583 Antilochus 8.6108.842101.62111.69L431.540.9501950 list
    884 Priamus 8.81101.09396.29119.99L56.860.9001917 list
    1208 Troilus 8.99100.477103.34111.36L556.170.7401931 list
    1173 Anchises 8.8999.549126.27120.49L511.600.7801930 list
    2207 Antenor 8.8997.65885.1191.32L57.970.9501977 list
    2363 Cebriones 9.1195.97681.8484.61L520.050.9101977 list
    4063 Euforbo 8.795.619102.46106.38L48.850.9501989 list
    2357 Phereclos 8.9494.62594.9098.45L514.390.9601981 list
    4709 Ennomos 8.591.43380.8580.03L512.280.6901988 list
    2797 Teucer 8.789.430111.14113.99L410.150.9201981 list
    2920 Automedon 8.888.574111.01113.11L410.210.9501981 list
    15436 Dexius 9.187.64685.7178.63L48.970.8701998 list
    3596 Meriones 9.287.38075.0973.28L412.960.8301985 list
    2893 Peiroos 9.2386.88487.4686.76L58.960.9501975 list
    4086 Podalirius 9.185.49586.8985.98L410.430.8701985 list
    4060 Deipylos 9.384.04379.2186.79L49.300.7601987 list
    1404 Ajax 9.383.99081.6996.34L429.380.9601936 list
    4348 Poulydamas 9.582.03270.0887.51L59.910.8401988 list
    5144 Achates 9.080.95891.9189.85L55.960.9201991 list
    4833 Meges 8.980.16587.3389.39L414.250.9401989 list
    2223 Sarpedon 9.4177.48094.63108.21L522.740.8801977 list
    4489 Dracius 9.076.59592.9395.02L412.580.9501988 list
    2260 Neoptolemus 9.3176.43571.6581.28L48.180.9501975 list
    5254 Ulysses 9.276.14778.3480.00L428.720.9701986 list
    3708 Socus 9.375.66179.5976.75L56.550.9801974 list
    2674 Pandarus 9.174.26798.10101.72L58.481.0001982 list
    3564 Talthybius 9.473.73068.9274.11L440.590.9001985 list
    4834 Thoas 9.172.33186.8296.21L418.190.9501989 list
    7641 Cteatus 9.471.83968.9775.28L427.770.9801986 list
    3540 Protesilaos 9.370.22576.8487.66L48.950.9401973 list
    11395 Iphinous 9.868.97764.7167.78L417.381998 list
    4035 Thestor 9.668.73368.2366.99L413.470.9701986 list
    5264 Telephus 9.468.47273.2681.38L49.530.9701991 list
    1868 Thersites 9.568.16370.0878.89L410.480.9601960 list
    9799 Thronium 9.668.03364.8772.42L421.520.9101996 list
    4068 Menestheus 9.567.62562.3768.46L414.400.9501973 list
    23135 Pheidas 9.966.23058.2968.50L48.690.8602000 list
    2456 Palamedes 9.365.91691.6699.60L47.240.9201966 list
    3709 Polypoites 9.165.29799.0985.23L410.041.0001985 list
    1749 Telamon 9.564.89881.0669.14L416.980.9701949 list
    3548 Eurybates 9.663.88572.1468.40L48.710.7301973 list
    4543 Phoinix 9.763.83662.7969.54L438.871.2001989 list
    12444 Prothoon 9.863.83564.3162.41L515.821996 list
    4836 Medon 9.563.27767.7378.70L49.820.9201989 list
    16070 Charops 9.763.19164.1368.98L520.240.9601999 list
    15440 Eioneus 9.662.51966.4871.88L421.430.9701998 list
    4715 Medesicaste 9.762.09763.9165.93L58.810.8501989 list
    34746 Thoon 9.861.68460.5163.63L519.630.9502001 list
    38050 Bias 9.861.60361.0450.44L418.850.9901998 list
    5130 Ilioneus 9.760.71159.4052.49L514.770.9601989 list
    5027 Androgeos 9.659.78657.86n.a.L411.380.9101988 list
    6090 Aulis 9.459.56874.5381.92L418.480.9801989 list
    5648 Axius 9.759.29563.91n.a.L537.560.9001990 list
    7119 Hiera 9.759.15076.4077.29L44000.9501989 list
    4805 Asteropaios 10.057.64753.1643.44L512.371990 list
    16974 Iphthime 9.857.34155.4357.15L478.90.9601998 list
    4867 Polites 9.857.25158.2964.29L511.241.0101989 list
    2895 Memnon 10.056.70655.67n.a.L57.500.7101981 list
    4708 Polydoros 9.954.96455.67n.a.L57.520.9601988 list
    (21601) 1998 XO89 10.054.90955.6756.08L412.650.9701998 list
    12929 Periboea 9.954.07761.0455.34L59.270.8801999 list
    17492 Hippasos 10.053.97555.67n.a.L517.751991 list
    5652 Amphimachus 10.153.92153.1652.48L48.371.0501992 list
    2759 Idomeneus 9.953.67661.0152.55L432.380.9101980 list
    5258 Rhoeo 10.253.27550.77n.a.L419.851.0101989 list
    (12126) 1999 RM11 10.153.202n.a.n.a.L5n.a. ?1999 list
    (15502) 1999 NV27 10.053.10055.6750.86L515.130.8751999 list
    4754 Panthoos 10.053.02553.1556.96L527.681977 list
    4832 Palinurus 10.052.05853.16n.a.L55.321.0001988 list
    5126 Achaemenides 10.551.92244.2248.57L453.021989 list
    3240 Laocoon 10.251.69550.77n.a.L511.310.8801978 list
    4902 Thessandrus 9.851.26361.0471.79L47380.9601989 list
    11552 Boucolion 10.151.13653.1653.91L532.441993 list
    (20729) 1999 XS143 10.450.96146.30n.a.L45.721.0001999 list
    6545 Leitus 10.150.95153.16n.a.L416.260.9101986 list
    4792 Lykaon 10.150.87053.16n.a.L540.090.9601988 list
    21900 Orus 10.050.81055.6753.87L413.450.9501999 list
    1873 Agenor 10.150.79953.7654.38L520.601971 list
    5028 Halaesus 10.250.77050.77n.a.L424.940.9001988 list
    2146 Stentor 9.950.75558.29n.a.L416.401976 list
    4722 Agelaos 10.050.37853.1659.47L518.440.9101977 list
    5284 Orsilocus 10.150.15953.16n.a.L410.310.9701989 list
    11509 Thersilochos 10.149.96053.1656.23L517.371990 list
    5285 Krethon 10.149.60658.5352.61L412.041.0901989 list
    4791 Iphidamas 10.149.52857.8559.96L59.701.0301988 list
    9023 Mnesthus 10.149.15150.7760.80L530.661988 list
    5283 Pyrrhus 9.748.35664.5869.93L47.320.9501989 list
    4946 Askalaphus 10.248.20952.7166.10L422.730.9401988 list
    (22149) 2000 WD49 10.248.19050.7750.37L47.841.0902000 list
    (32496) 2000 WX182 10.248.01750.7751.63L523.340.9502000 list
    5120 Bitias 10.247.98750.77n.a.L515.210.7801988 list
    12714 Alkimos 10.147.81961.0454.62L428.481991 list
    7352 Hypsenor 9.947.73155.67 47.07L56480.8501994 list
    1870 Glaukos 10.647.64942.23n.a.L55.991971 list
    4138 Kalchas 10.146.46253.1661.04L429.20.8101973 list
    (23958) 1998 VD30 10.246.00150.7747.91L45620.9901998 list
    4828 Misenus 10.445.95446.30 43.22L512.870.9201988 list
    4057 Demophon 10.145.68353.16n.a.L429.821.0601985 list
    4501 Eurypylos 10.445.52446.30n.a.L46.051989 list
    4007 Euryalos 10.345.51548.4853.89L46.391973 list
    5259 Epeigeus 10.344.74142.5944.42L418.421989 list
    30705 Idaios 10.444.54646.30n.a.L515.741977 list
    16560 Daitor 10.743.86151.4243.38L51991 list
    (15977) 1998 MA11 10.443.53046.3051.53L52500.9061998 list
    7543 Prylis 10.642.89342.23n.a.L417.801973 list
    4827 Dares 10.542.77044.22n.a.L519.001988 list
    1647 Menelaus 10.542.71644.22n.a.L417.740.8661957 list
    (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.

    Related Research Articles

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    <span class="mw-page-title-main">1437 Diomedes</span> Trojan asteroid

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    2456 Palamedes is a large Jupiter trojan from the Greek camp, approximately 90 kilometers in diameter. It was discovered on 30 January 1966, by astronomers at the Purple Mountain Observatory in Nanking, China. The assumed C-type asteroid has a rotation period of 7.24 hours and belongs to the 50 largest Jupiter trojans. It was named after Palamedes from Greek mythology.

    2920 Automedon is a large Jupiter trojan from the Greek camp, approximately 110 kilometers in diameter. It was discovered by American astronomer Edward Bowell at the Anderson Mesa station of the Lowell Observatory on 3 May 1981. The dark D-type asteroid has a rotation period of 10.22 hours and belongs to the 30 largest Jupiter trojans. It was named after the ancient Greek hero Automedon, the charioteer of Achilles.

    12714 Alkimos is a large Jupiter trojan from the Greek camp, approximately 54 kilometers in diameter. It was discovered on 15 April 1991, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California. The dark Jovian asteroid has a rotation period of 28.5 hours. It was named from Greek mythology after Alcimus, son of Ares and companion of Achilles.

    4791 Iphidamas is a Jupiter trojan from the Trojan camp, approximately 58 kilometers in diameter. It was discovered on 14 August 1988, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The dark Jovian asteroid belongs the 100 largest Jupiter trojans and has a rotation period of 9.7 hours. It was named after the Trojan warrior Iphidamas, from Greek mythology.

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    4754 Panthoos is a Jupiter trojan from the Trojan camp, approximately 53 kilometers in diameter. It was discovered during the third Palomar–Leiden Trojan survey on 16 October 1977, by Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at the Palomar Observatory in California. It is likely spherical in shape and has a longer-than-average rotation period of 27.68 hours. The assumed C-type asteroid is one of the 80 largest Jupiter trojans. It was named after Panthous (Panthoos) from Greek mythology.

    4543 Phoinix is a large Jupiter trojan from the Greek camp, approximately 63 kilometers in diameter. It was discovered on 2 February 1989, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The assumed C-type asteroid is possibly elongated and has a longer-than-average rotation period of 38.9 hours. It is one of the 60 largest Jupiter trojans and was named after Phoenix (Phoinix) from Greek mythology.

    4086 Podalirius is a large Jupiter trojan from the Greek camp, approximately 86 kilometers in diameter. It was discovered on 9 November 1985, by Soviet astronomer Lyudmila Zhuravleva at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. The assumed C-type asteroid belongs to the 40 largest Jupiter trojans and has a rotation period of 10.43 hours. It was named after the legendary healer Podalirius from Greek mythology.

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    4834 Thoas is a large Jupiter trojan from the Greek camp, approximately 86 kilometers in diameter. It was discovered on 11 January 1989, by astronomer Carolyn Shoemaker at the Palomar Observatory. The C-type asteroid is one of the 50 largest Jupiter trojans and has a rotation period of 18.19 hours. It was named after Thoas from Greek mythology.

    <span class="mw-page-title-main">4489 Dracius</span> Jupiter trojan (asteroid)

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    <span class="mw-page-title-main">4715 Medesicaste</span>

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    6090 Aulis, provisional designation: 1989 DJ, is a Jupiter trojan from the Greek camp, approximately 70 kilometers in diameter. It was discovered on 27 February 1989, by Belgian astronomer Henri Debehogne at ESO's La Silla Observatory in northern Chile. The dark Jovian asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 18.5 hours. It was named for the ancient Greek port Aulis, mentioned in the Iliad.

    7641 Cteatus, provisional designation: 1986 TT6, is a large Jupiter trojan from the Greek camp, approximately 70 kilometers (43 miles) in diameter. It was discovered on 5 October 1986, by Slovak astronomer Milan Antal at the Toruń Centre for Astronomy in Piwnice, Poland. The dark D-type asteroid is notably inclined and has longer-than-average rotation period of 27.8 hours. It belongs to the 50 largest Jupiter trojans. It was named from Greek mythology for Cteatus, the conjoined twin and father of Amphimachus.

    <span class="mw-page-title-main">16974 Iphthime</span>

    16974 Iphthime (; provisional designation 1998 WR21) is a Jupiter trojan and a binary system from the Greek camp, approximately 57 kilometers (35 miles) in diameter. It was discovered on 18 November 1998, by astronomers with the Lincoln Near-Earth Asteroid Research at the ETS Test Site in Socorro, New Mexico. The dark Jovian asteroid belongs to the 80 largest Jupiter trojans and has a notably slow rotation of 78.9 hours. It was named after Iphthime from Greek mythology. The discovery of its companion by Hubble Space Telescope was announced in March 2016.

    15436 Dexius, provisional designation: 1998 VU30, is a large Jupiter trojan from the Greek camp, approximately 86 kilometers (53 miles) in diameter. It was discovered on 10 November 1998, by astronomers of the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. The presumed C-type asteroid has a rotation period of 8.97 hours. It is one of the 50 largest Jupiter trojans and was named after Dexius, father of Iphinous from Greek mythology.

    11395 Iphinous (provisional designation 1998 XN77) is a large Jupiter trojan from the Greek camp approximately 66 kilometers (41 miles) in diameter. It was discovered on 15 December 1998, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States. The dark asteroid has a rotation period of 17.4 hours and possibly a spherical shape. The body is one of the 50 largest Jupiter trojans. It was named from Greek mythology after the Achaean soldier Iphinous who was killed by Glaucus in the Trojan War.

    9799 Thronium, provisional designation: 1996 RJ, is a large Jupiter trojan from the Greek camp and the parent body of a small, unnamed asteroid family (006), approximately 68 kilometers in diameter. It was discovered on 8 September 1996, by American astronomer Timothy Spahr at the Catalina Station of the Steward Observatory near Tucson, Arizona, in the United States. The assumed C-type asteroid belongs to the 50 largest Jupiter trojans and has a relatively long rotation period of 21.52 hours. It was named for the ancient Greek city of Thronium mentioned in the Iliad.

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