13062 Podarkes

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13062 Podarkes
Discovery [1]
Discovered by C. Shoemaker
E. Shoemaker
Discovery site Palomar Obs.
Discovery date 19 April 1991
MPC designation 13062 Podarkes
Named after
(Greek mythology)[2]
1991 HN · 1998 XC56
Jupiter trojan[1]
(Greek camp)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 24.40 yr (8,911 days)
Aphelion 5.2061 AU
Perihelion 5.1092 AU
5.1576 AU
Eccentricity 0.0094
11.71 yr (4,278 days)
0° 5m 2.76s / day
Inclination 8.2326°
Jupiter MOID 0.0129 AU
Jupiter Tisserand parameter 2.98
Physical characteristics
Dimensions 40 km (est. at 0.05)[3]

13062 Podarkes, provisional designation 1991 HN, is a Jupiter trojan from the Greek camp, roughly 40 kilometers in diameter. It was discovered by American astronomer couple Carolyn and Eugene Shoemaker at the U.S. Palomar Observatory, California, on 19 April 1991.[4]

The orbit of this Trojan asteroid is unstable.[5][6][7] It is orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit (see Trojans in astronomy). It orbits the Sun at a distance of 5.1–5.2 AU once every 11 years and 9 months (4,278 days). It has a low eccentricity of 0.01 and an inclination of 8° with respect to the ecliptic.[1] The first used precoveries were taken at Steward Observatory (Kitt Peak–Spacewatch), extending the asteroid's observation arc by just two weeks prior to its discovery.[4]

As of 2016, the asteroid's effective size, its composition and albedo, as well as its rotation period and shape remain unknown. Based on its absolute magnitude of 11.1, it has a calculated diameter between 15 and 40 kilometers, assuming an albedo in the range of 0.05 to 0.25.[3] Since Jupiter trojans are known to be of carbonaceous rather than of silicaceous composition with low albedos, typically around 0.05, the body's diameter is likely to measure around 40 kilometers.[3]

The minor planet is named from Greek mythology after the Greek warrior Podarkes, who took 40 ships to the Trojan War. He is the son of Ares and brother of Protesilaos, after whom the Jupiter trojan, 3540 Protesilaos, is named.[2] Protesilaos was the first Greek to set foot on the shores of Troy and to die in the war. Naming citation was published on 13 October 2000 (M.P.C. 41386).[8]


  1. ^ a b c d e "JPL Small-Body Database Browser: 13062 Podarkes (1991 HN)" (2015-08-14 last obs.). Jet Propulsion Laboratory. Retrieved 17 May 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (13062) Podarkes. Springer Berlin Heidelberg. p. 792. ISBN 978-3-540-00238-3. Retrieved 6 April 2016. 
  3. ^ a b c "Absolute Magnitude (H)". NASA/JPL. Retrieved 6 April 2016. 
  4. ^ a b "13062 Podarkes (1991 HN)". Minor Planet Center. Retrieved 6 April 2016. 
  5. ^ Celestial Mechanics and Dynamical Astronomy, Volume 78, Numbers 1-4, 125-136, DOI: 10.1023/A:1011120413687
  6. ^ Celestial Mechanics and Dynamical Astronomy, Volume 73, Numbers 1-4, 117-126, DOI: 10.1023/A:1008338811969
  7. ^ Bonnie A. Steves & A. J. Maciejewski (2001). The restless universe: applications of gravitational n-body dynamics to planetary, stellar and galactic systems : proceedings of the fifty-fourth Scottish Universities Summer School in Physics, Blair Atholl, 23 July - 5 August 2000. Scottish Graduate. Scottish Universities Summer School in Physics, Institute of Physics. ISBN 9780750308229. 
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016. 

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