11395 Iphinous

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.[1] The dark asteroid has a rotation period of 17.4 hours and possibly a spherical shape.[4] The body is one of the 50 largest Jupiter trojans.[1] It was named from Greek mythology after the Achaean soldier Iphinous who was killed by Glaucus in the Trojan War.[2]

11395 Iphinous
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date15 December 1998
Designations
(11395) Iphinous
Named after
Iphinous
(Greek mythology)[2]
1998 XN77 · 1992 GF3
Jupiter trojan[1][3][4]
Greek[5][6] · background[6]
AdjectivesIphinoian
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc26.63 yr (9,727 d)
Aphelion5.5632 AU
Perihelion4.8590 AU
5.2111 AU
Eccentricity0.0676
11.90 yr (4,345 d)
316.51°
0° 4m 58.44s / day
Inclination24.141°
213.24°
118.07°
Jupiter MOID0.0684 AU
TJupiter2.8210
Physical characteristics
Mean diameter
64.51 km (derived)[4]
64.71±3.1 km[7]
67.78±1.84 km[8]
68.98±1.12 km[9]
13.696±0.06 h[10]
13.70±0.06 h (poor)[10]
17.383±0.005 h[11][lower-alpha 1]
17.44±0.01 h[12][lower-alpha 1]
17.89±0.005 h (poor)[11][lower-alpha 1]
0.045±0.007[9]
0.0510 (derived)[4]
0.061±0.004[8]
0669±0.007[7]
C (assumed)[4]
9.50[7][8]
9.8[1][3][4][9]

    Orbit and classification

    Iphinous is a 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][13] The asteroid orbits the Sun at a distance of 4.9–5.6 AU once every 11 years and 11 months (4,345 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.07 and an inclination of 24° with respect to the ecliptic.[3]

    The body's observation arc begins with a precovery taken at the Siding Spring Observatory in February 1991, nearly 8 years prior to its official discovery observation at Socorro.[1]

    Naming

    This minor planet was numbered on 31 August 1999 (M.P.C. 35589).[14] On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN) after Iphinous from Greek mythology. An Achaean soldier who participated in the Trojan War, Iphinous was killed by Glaucus in hand-to-hand combat during the siege of Troy.[2]

    Physical characteristics

    Iphinous is a generically assumed C-type asteroid.[4] Many if not most Jupiter trojans show an even darker D or P-type spectrum.

    Rotation period

    In 2009 and 2010, two fragmentary lightcurves of Iphinous were obtained from photometric observations by Stefano Mottola at the Calar Alto Observatory in Spain. Lightcurve analysis gave a tentative rotation period of 13.696 and 13.70 hours with a brightness variation of 0.14 and 0.06 magnitude, respectively (U=2-/1+).[10]

    During 2015–2017, three additional photometric observation were made at the Californian Center for Solar System Studies by Robert Stephens, Daniel Coley and Brian Warner in collaboration with Linda French from Illinois Wesleyan University. The two best-rated lightcurves gave a period of 17.383 and 17.44 with an amplitude of 0.08 and 0.11 magnitude, respectively, indicating that the body has a nearly spherical shape (U=3-/3-).[11][12][lower-alpha 1]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Iphinous measures between 64.71 and 68.98 kilometers in diameter and its surface has an albedo between 0.045 and 0.067.[7][8][9]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0510 and a diameter of 64.51 kilometers based on an absolute magnitude of 9.8.[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 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. Three lightcurve plots of (11395) Iphinous by Robert Stephens and collaborators at the Center for Solar System Studies (U81) in Landers, California. Plots from 2015 (poor), 2016 and 2017. Summary figures at the LCDB.

    References

    1. "11395 (1998 XN77)". Minor Planet Center. Retrieved 31 May 2018.
    2. "WGSBN Bulletin Archive". Working Group for Small Bodies Nomenclature. 14 May 2021. Retrieved 16 May 2021. (Bulletin #1)
    3. "JPL Small-Body Database Browser: 11395 (1998 XN77)" (2017-09-28 last obs.). Jet Propulsion Laboratory. Retrieved 31 May 2018.
    4. "LCDB Data for (11395)". Asteroid Lightcurve Database (LCDB). Retrieved 31 May 2018.
    5. "List of Jupiter Trojans". Minor Planet Center. 2 February 2018. Retrieved 31 May 2018.
    6. "Asteroid (11395) 1998 XN77 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 31 May 2018.
    7. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
    8. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    9. 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)
    10. Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
    11. Stephens, Robert D.; Coley, Daniel R.; Warner, Brian D.; French, Linda, M. (October 2016). "Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies". The Minor Planet Bulletin. 43 (4): 323–331. Bibcode:2016MPBu...43..323S. ISSN 1052-8091.{{cite journal}}: CS1 maint: multiple names: authors list (link)
    12. Stephens, Robert D.; Warner, Brian D. (October 2017). "Lightcurve Analysis of L4 Trojan Asteroids at the Center for Solar System Studies 2017 April–June". The Minor Planet Bulletin. 44 (4): 312–316. Bibcode:2017MPBu...44..312S. ISSN 1052-8091.
    13. "Asteroid (11395) 1998 XN77". Small Bodies Data Ferret. Retrieved 31 May 2018.
    14. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 May 2018.
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