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5259 Epeigeus

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5259 Epeigeus
Discovery [1]
Discovered byC. S. Shoemaker
E. M. Shoemaker
Discovery sitePalomar Obs.
Discovery date30 January 1989
Designations
(5259) Epeigeus
Pronunciation/ɪˈpiːdʒiːəs/
Named after
Επειγεύς [1]
(Greek mythology)
1989 BB1
Jupiter trojan [1][2]
Greek [3] · background [4]
AdjectivesEpeige(i)an
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc38.18 yr (13,946 d)
Aphelion5.5824 AU
Perihelion4.8187 AU
5.2005 AU
Eccentricity0.0734
11.86 yr (4,332 d)
27.038°
0° 4m 59.16s / day
Inclination15.921°
67.461°
200.12°
Jupiter MOID0.5047 AU
TJupiter2.9180
Physical characteristics
42.59±4.4 km[5]
44.42±2.34 km[6]
44.74±1.06 km[7]
18.42±0.03 h[8]
0.069±0.008[6]
0.073±0.007[7]
0.0739±0.018[5]
D (Pan-STARRS)[9][10]
D (SDSS-MOC)[11]
10.2[7]
10.30[1][2][5][6][9]

5259 Epeigeus /ɪˈpiːdʒiːəs/ is a mid-sized Jupiter trojan from the Greek camp, approximately 44 kilometers (27 miles) in diameter. It was discovered on 30 January 1989, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California.[1] The D-type asteroid has a rotation period of 18.4 hours.[9] It was named after the Myrmidon hero Epeigeus from Greek mythology.[1]

Orbit and classification[edit]

Epeigeus 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).[3] It is also a non-family asteroid of the Jovian background population.[4]

It orbits the Sun at a distance of 4.8–5.6 AU once every 11 years and 10 months (4,332 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.07 and an inclination of 16° with respect to the ecliptic.[2]

The body's observation arc begins with a precovery taken at the Siding Spring Observatory in March 1980, almost 8 years prior to its official discovery observation at Palomar.[1]

Physical characteristics[edit]

In the SDSS-based taxonomy, Epeigeus is a D-type asteroid.[11] It has also been characterized as a D-type by Pan-STARRS' survey.[9][10] It is the most common spectral type among the Jupiter trojans.

Rotation period[edit]

In August 1995, a rotational lightcurve of Epeigeus was obtained from photometric observations over five consecutive nights by Italian astronomer Stefano Mottola using the Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile. Lightcurve analysis gave a rotation period of 18.42±0.03 hours with a low brightness amplitude of 0.10 magnitude (U=2).[8][9]

Diameter and albedo[edit]

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, Epeigeus measures between 42.59 and 44.74 kilometers in diameter and its surface has an albedo between 0.069 and 0.074.[5][6][7]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0738 and a diameter of 42.59 kilometers based on an absolute magnitude of 10.3.[9]

100+ largest Jupiter trojans

Naming[edit]

This minor planet was named from Greek mythology after the Greek warrior Epeigeus, who belonged to the Myrmidons commanded by Achilles. He was killed by Hector, who hit him upon the crest of his helmet with a great stone.[1] The official naming citation was published by the Minor Planet Center on 12 July 1995 (M.P.C. 25443).[12]

References[edit]

  1. ^ Jump up to: a b c d e f g h "5259 Epeigeus (1989 BB1)". Minor Planet Center. Retrieved 21 June 2018.
  2. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 5259 Epeigeus (1989 BB1)" (2018-05-25 last obs.). Jet Propulsion Laboratory. Retrieved 21 June 2018.
  3. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 21 June 2018.
  4. ^ Jump up to: a b "Asteroid (5259) Epeigeus – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 21 June 2018.
  5. ^ Jump up to: a b c d 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 21 June 2018.
  6. ^ Jump up to: a b c d 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)
  7. ^ Jump up to: a b c d 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)
  8. ^ Jump up to: a b 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.
  9. ^ Jump up to: a b c d e f "LCDB Data for (5259) Epeigeus". Asteroid Lightcurve Database (LCDB). Retrieved 21 June 2018.
  10. ^ Jump up to: a b 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.
  11. ^ Jump up to: a b Carvano, 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. Retrieved 30 October 2019. (PDS data set)
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 21 June 2018.

External links[edit]

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