4060 Deipylos
Minorplanetyes
Background
  1. C2FFFF
DiscovererE. W. Elst
G. Pizarro
Discovery siteLa Silla Obs.
Discovered17 December 1987
Mpc name(4060) Deipylos
Alt names· 1942 ET
1950 UJ ·
1966 FN
AdjectiveDeipylian
Pronounced/diːɪpᵻləs/[1]
Named afterDeipylos[2]
(Greek mythology)
Mp categoryJupiter trojan[2][3][4]
Greek[5][6] · background[6]
Epoch23 March 2018 (JD 2458200.5)
Uncertainty0
Observation arc75.63 yr (27,624 d)
Aphelion6.0549 AU
Perihelion4.4428 AU
Semimajor5.2488 AU
Eccentricity0.1536
Period12.03 yr (4,392 d)
Mean anomaly166.69°
Mean motion/ day
Inclination16.148°
Asc node168.21°
Arg peri307.50°
Jupiter moid0.5481 AU
Tisserand2.8980
Mean diameter66.34 km (calculated)[4]
79.21 ± 4.3 km[7]
84.04 ± 0.57 km[8]
86.79 ± 3.10 km[9]
Rotation9.19 ± 0.02 h[10][a]
9.297 ± 0.007 h[11][a]
9.298 ± 0.007 h[11][a]
9.38 ± 0.02 h[12][a]
11.490 ± 0.0037 h[13]
Albedo0.043 ± 0.003[8]
0.057 (assumed)[4]
0.067 ± 0.005[9]
0.0776 ± 0.009[7]
Abs magnitude8.90[7][9]
9.169 ± 0.002 (R)[13]
9.3[3]
9.37 ± 0.28[14]
9.4[8]
9.62[4]

4060 Deipylos /diːɪpᵻləs/ is a large Jupiter trojan from the Greek camp, approximately 84 kilometers (52 miles) in diameter. It was discovered on 17 December 1987, by astronomers Eric Elst and Guido Pizarro at ESO's La Silla Observatory in northern Chile.[2] The transitional C-type asteroid belongs to the 40 largest Jupiter trojans and has rotation period of 9.3 hours.[4] It was named after Deipylos from Greek mythology.[2]

Orbit and classification

Deipylos is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's Lagrangian point, 60° ahead its orbit in a 1:1 resonance (see Trojans in astronomy). It is a non-family asteroid in the Jovian background population.[6][15] It orbits the Sun at a distance of 4.4–6.1 AU once every 12.03 years (4,392 days; semi-major axis of 5.25 AU). Its orbit has an eccentricity of 0.15 and an inclination of 16° with respect to the ecliptic.[3]

The body's observation arc begins with its first observation as ' at Turku Observatory in March 1942yxz years prior to its official discovery observation.[2]

Physical characteristics

Deipylos has been characterized as a carbonaceous C-type asteroid in the Tholen-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2). In their SMASS-like taxonomy, S3OS2 classified Deipylos as an Cb-subtype that transitions to the somewhat brighter B-type asteroids.[15][16] The Collaborative Asteroid Lightcurve Link also assumes it to be of carbonaceous composition.[4]

Rotation period

In December 2010, a rotational lightcurve of Deipylos was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 11.490 hours with a brightness amplitude of 0.11 magnitude (U=2)[13] Between 2015 and 2017, several observations by Robert Stephens in collaboration with Daniel Coley and Brian Warner at the Center for Solar System Studies in California gave a more refined period between 9.19 and 9.38 hours and an amplitude of 0.07–0.13 magnitude (U=3-/3-/3-/2+).[10][11][12] The best-rated result gave 9.298 hours with an amplitude of 0.07 ± 0.02 magnitude.[4][11][a]

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, Deipylos measures between 79.21 and 86.79 kilometers in diameter and its surface has an albedo between 0.043 and 0.078.[7][8][9] CALL assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 66.34 kilometers based on an absolute magnitude of 9.62.[4]

Naming

This minor planet was named after Deipylos a Greek hero in the Trojan War. He was a fellow of Sthenelus (Sthenelos), who ordered him to bring the horses captured from Aeneas to the Greek vessels.[2] The official naming citation was published by the Minor Planet Center on 15 September 1989 (M.P.C. 15090).[17]

Notes

  1. ^ Lightcurve plots of (4060) Deipylos from 2015, 2016 and 2017 by Robert Stephens at the Center for Solar System Studies . Quality code is 3/3-/3- (lightcurve rating at CS3). Summary figures at the LCDB.

References

  1. ^ 'Deipyle' in Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ "4060 Deipylos (1987 YT1)". Minor Planet Center. Retrieved 4 June 2018.
  3. ^ "JPL Small-Body Database Browser: 4060 Deipylos (1987 YT1)" (2017-10-28 last obs.). Jet Propulsion Laboratory. Retrieved 4 June 2018.
  4. ^ No. 4060. Retrieved 4 June 2018.
  5. ^ "List of Jupiter Trojans". Minor Planet Center. 2 February 2018. Retrieved 4 June 2018.
  6. ^ "Asteroid (4060) Deipylos". AstDyS-2, Asteroids – Dynamic Site. Retrieved 4 June 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. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
  8. ^ 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)
  9. ^ 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)
  10. ^ Stephens, Robert D.; Coley, Daniel, R.; French, Linda M. (January 2016). "Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (1): 15–22. Bibcode:2016MPBu...43...15S. ISSN 1052-8091
  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
  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. ^ Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. S2CID 8342929
  14. ^ 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
  15. ^ "Asteroid 4060 Deipylos". Small Bodies Data Ferret. Retrieved 4 June 2018.
  16. ^ Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids". Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 4 June 2018.
  17. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 June 2018.