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1867 Deiphobus

From Wikipedia, the free encyclopedia
Jupiter trojan asteroid

1867 Deiphobus
Discovery[1]
Discovered byC. U. Cesco
A. G. Samuel
Discovery siteEl Leoncito Complex
Discovery date3 March 1971
Designations
(1867) Deiphobus
Pronunciation/dˈɪfəbəs/[2]
Named after
Deiphobus(Greek mythology)[3]
1971 EA
Jupiter trojan[1][4][5]
Trojan[6][7] · Ennomos[8]
AdjectivesDeiphobian
Orbital characteristics[4]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc46.15 yr (16,858 days)
Aphelion5.3511AU
Perihelion4.9040 AU
5.1276 AU
Eccentricity0.0436
11.61yr (4,241 days)
229.96°
0° 5m 5.64s / day
Inclination26.914°
283.71°
359.19°
Jupiter MOID0.1574 AU
TJupiter2.7830
Physical characteristics
118.22±1.62 km[9]
122.65 km(derived)[5]
122.67±3.9 km[10]
131.31±1.87 km[11]
58.62±0.03 h[12][a]
58.66±0.18 h[13]
58.699±0.002 h[14][a]
0.037±0.001[11]
0.0396(derived)[5]
0.0422±0.003[10]
0.060±0.009[9]
D(Tholen)[8]
D0(Barucci)[8]
D(Tedesco)[8]
D(SDSS-MOC)[15]
U–B =0.232±0.060[8]
B–V =0.760±0.050[16]
V–R =0.460±0.050[16]
V–I =0.930±0.027[5]
8.3[1][4][9]
8.47±0.10[17]
8.61[10][11]
8.68[5][18]

1867 Deiphobus/dˈɪfəbəs/ is a darkJupiter trojan from theTrojan camp, approximately 123 kilometers (76 mi) in diameter. It was discovered on 3 March 1971, by Argentine astronomersCarlos Cesco andA. G. Samuel at theLeoncito Astronomical Complex in Argentina,[1] and later named after the Trojan princeDeiphobus from Greek mythology.[3] The darkD-type asteroid is one of thelargest Jupiter trojans. It is a member of theEnnomos family and has a longrotation period of 58.66 hours.[5]

Orbit and classification

[edit]

Deiphobus is a dark Jovianasteroid orbiting in the trailingTrojan camp at Jupiter'sL5Lagrangian point, 60° behind its orbit in a1:1 resonance(seeTrojans in astronomy). It is a member of theEnnomos family (009),[8] a small Jovianasteroid family with 30 known members, named after4709 Ennomos.[19]: 23  There only a few Jovian families known to date. The Ennomos family was first identified by Jakub Rozehnal and Miroslav Brož in 2011.[20] However, a differentHCM-based analysis assignsDeiphobus to theJovian background population.[7]

It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 7 months (4,241 days;semi-major axis of 5.13 AU). Its orbit has aneccentricity of 0.04 and aninclination of 27° with respect to theecliptic.[4] The body'sobservation arc begins with its official discovery observation at Leoncito in March 1971.[1]

Physical characteristics

[edit]
The largestJupiter trojans
TrojanDiameter (km)
624 Hektor225
617 Patroclus140
911 Agamemnon131
588 Achilles130
3451 Mentor126
3317 Paris119
1867 Deiphobus118
1172 Äneas118
1437 Diomedes118
1143 Odysseus115
Source:JPL Small-Body Database,NEOWISE data

Deiphobus is characterized as a darkD-type asteroid in theTholen, Barucci, Tedesco, as well as in theSDSS-based taxonomy.[8][15]

Lightcurves

[edit]

Several rotationallightcurve have been obtained since 1987, when the firstphotometric observations ofDeiphobus by Linda French atCTIO indicated that the body has longer-than averagerotation period of at least 24 hours.(U=2).[5][18] In February 1994, observations byStefano Mottola and Anders Erikson, using theESO 1-metre telescope atLa Silla Observatory in Chile, gave a slow rotation period of58.66±0.18 hours with a brightness variation of0.27±0.03magnitude (U=3-).[5][13]

Since 2015, follow-up observations byRobert Stephens at theCenter for Solar System Studies measured 58.62 and 58.699, confirming Mottola's long period (U=3-/3-),[12][14][a] and superseding other reported periods from fragmentary lightcurves (U=2/1).[21][b]

While not being aslow rotator,Deiphobus has a much longer rotation period than the vast majority of asteroids, which typically rotate between 2 and 20 hours once around their axis. Among all large Jovian asteroids, only617 Patroclus has a longer period thanDeiphobus.

Diameter and albedo

[edit]

According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Deiphobus measures between 118.22 and 131.31 kilometers in diameter, and its surface has analbedo between 0.037 and 0.060.[9][10][11] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0396 and a diameter of 122.65 kilometers based on anabsolute magnitude of 8.68.[5]

100+ largest Jupiter trojans
Largest Jupiter Trojans by survey(A)
(mean-diameter in kilometers; YoD: Year of Discovery)
DesignationHWISEIRASAkariLnRPV–IYoDRef
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 Aias10.054.90955.6756.08L412.650.9701998list
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 Chersidamas10.153.202n.a.n.a.L5n.a.?1999list
15502 Hypeirochus10.053.10055.6750.86L515.130.8751999list
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 Opheltius10.450.96146.30n.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 Cinyras10.248.19050.7750.37L47.841.0902000list
32496 Deïopites10.248.01750.7751.63L523.340.9502000list
5120 Bitias10.247.98750.77n.a.L515.210.7801988list
12714 Alkimos10.147.81961.0454.62L428.481991list
7352 Hypsenor9.947.73155.6747.07L56480.8501994list
1870 Glaukos10.647.64942.23n.a.L55.991971list
4138 Kalchas10.146.46253.1661.04L429.20.8101973list
23958 Theronice10.246.00150.7747.91L45620.9901998list
4828 Misenus10.445.95446.3043.22L512.870.9201988list
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 Pyraechmes10.443.53046.3051.53L52500.9061998list
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); andAkari catalog (Usui, 2011); RP:rotation period andV–I (color index) taken from theLCDB

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.

Naming

[edit]

Thisminor planet was named after the Trojan warrior,Deiphobus, son of KingPriam(also see108 Hecuba and884 Priamus).[3] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3935).[22]

Notes

[edit]
  1. ^abcLightcurve plots of (1867) Deiphobus fromNov 2015,Feb 2017 byRobert Stephens at the Center for Solar System Studies (U81). Quality code is 3/3- (lightcurve rating at CS3). Summary figures at theLCDB andCS3.
  2. ^Melita (2012), gives a rotation period of51.70±0.05. Summary figures listed atLCDB

References

[edit]
  1. ^abcde"1867 Deiphobus (1971 EA)".Minor Planet Center. Retrieved13 June 2018.
  2. ^'Deiphobe' in Noah Webster (1884)A Practical Dictionary of the English Language
  3. ^abcSchmadel, Lutz D. (2007). "(1867) Deiphobus".Dictionary of Minor Planet Names.Springer Berlin Heidelberg. p. 150.doi:10.1007/978-3-540-29925-7_1868.ISBN 978-3-540-00238-3.
  4. ^abcd"JPL Small-Body Database Browser: 1867 Deiphobus (1971 EA)" (2017-04-28 last obs.).Jet Propulsion Laboratory. Retrieved9 June 2017.
  5. ^abcdefghi"LCDB Data for (1867) Deiphobus". Asteroid Lightcurve Database (LCDB). Retrieved13 June 2018.
  6. ^"List of Jupiter Trojans".Minor Planet Center. 20 August 2016. Retrieved12 December 2016.
  7. ^ab"Asteroid (1867) Deiphobus – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved13 June 2018.
  8. ^abcdefg"Asteroid 1867 Deiphobus".Small Bodies Data Ferret. Archived fromthe original on 13 June 2018. Retrieved13 June 2018.
  9. ^abcdGrav, 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. ^abcdTedesco, 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-V6.0.12: IRAS-A-FPA-3-RDR-IMPS-V6.0.Bibcode:2004PDSS...12.....T. Retrieved15 June 2018.
  11. ^abcdUsui, 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)
  12. ^abStephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2016)."A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies".The Minor Planet Bulletin.43 (3):265–270.Bibcode:2016MPBu...43..265S.ISSN 1052-8091. Retrieved12 December 2016.
  13. ^abMottola, 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.
  14. ^abStephens, Robert D.; Coley, Daniel R. (July 2017)."Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March".The Minor Planet Bulletin.44 (3):252–257.Bibcode:2017MPBu...44..252S.ISSN 1052-8091.PMC 7243922.PMID 32455404.
  15. ^abCarvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010)."SDSS-based taxonomic classification and orbital distribution of main belt asteroids".Astronomy and Astrophysics.510: 12.Bibcode:2010A&A...510A..43C.doi:10.1051/0004-6361/200913322. Retrieved30 October 2019.(PDS data set)
  16. ^abChatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016)."Photometric colors of the brightest members of the Jupiter L5 Trojan cloud".Icarus.271:158–169.Bibcode:2016Icar..271..158C.doi:10.1016/j.icarus.2016.01.026.
  17. ^Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 – Preliminary results".Icarus.261:34–47.arXiv:1506.00762.Bibcode:2015Icar..261...34V.doi:10.1016/j.icarus.2015.08.007.S2CID 53493339.
  18. ^abFrench, L. M. (November 1987)."Rotation properties of four L5 Trojan asteroids from CCD photometry".Icarus.72 (2): 325–341.MIT–supportedresearch.Bibcode:1987Icar...72..325F.doi:10.1016/0019-1035(87)90178-3.ISSN 0019-1035. Retrieved12 December 2016.
  19. ^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.
  20. ^Broz, M.; Rozehnal, J. (June 2011)."Eurybates – the only asteroid family among Trojans?".Monthly Notices of the Royal Astronomical Society.414 (1):565–574.arXiv:1109.1109.Bibcode:2011MNRAS.414..565B.doi:10.1111/j.1365-2966.2011.18420.x.S2CID 118743237.
  21. ^French, Linda M.; Stephens, Robert D.; Coley, Daniel R.; Megna, Ralph; Wasserman, Lawrence H. (July 2012)."Photometry of 17 Jovian Trojan Asteroids".The Minor Planet Bulletin.39 (3):183–187.Bibcode:2012MPBu...39..183F.ISSN 1052-8091. Retrieved12 December 2016.
  22. ^Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs".Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221.Bibcode:2009dmpn.book.....S.doi:10.1007/978-3-642-01965-4.ISBN 978-3-642-01964-7.

External links

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