13062 Podarkes
| Discovery [1] | |
|---|---|
| Discovered by |
C. Shoemaker E. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 19 April 1991 |
| Designations | |
| MPC designation | (13062) Podarkes |
| Pronunciation |
/pɒˈdɑːrkiːz/ po-DAR-keez |
Named after |
Podarkes (Greek mythology)[2] |
| 1991 HN · 1998 XC56 | |
|
Jupiter trojan [1][3] Greek [4] · background [5] | |
| Orbital characteristics [3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 26.51 yr (9,682 d) |
| Aphelion | 5.2114 AU |
| Perihelion | 5.1112 AU |
| 5.1613 AU | |
| Eccentricity | 0.0097 |
| 11.73 yr (4,283 d) | |
| 306.41° | |
| 0° 5m 2.76s / day | |
| Inclination | 8.2300° |
| 91.020° | |
| 281.35° | |
| Jupiter MOID | 0.0152 AU |
| TJupiter | 2.9790 |
| Physical characteristics | |
Mean diameter |
28.96±0.36 km[6] 40 km (est. at 0.05)[7] |
| 0.084±0.018[6] | |
| 11.1[1][3] | |
|
| |
13062 Podarkes (/pɒˈdɑːrkiːz/ po-DAR-keez), provisional designation 1991 HN, is a mid-sized Jupiter trojan from the Greek camp, approximately 29 kilometers (18 miles) in diameter. It was discovered on 19 April 1991, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory, California.[1] The dark Jovian asteroid is the principal body of the proposed Podarkes family. It was named after Podarkes from Greek mythology.[2]
Orbit and classification
The orbit of this Trojan asteroid is unstable.[8][9] 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 (4,283 days; semi-major axis of 5.16 AU). Its orbit has an eccentricity of 0.01 and an inclination of 8° with respect to the ecliptic.[3] The first used precoveries were taken by Spacewatch of the Steward Observatory at Kitt Peak, extending the asteroid's observation arc by just two weeks prior to its discovery.[1]
Podarkes family
Fernando Roig and Ricardo Gil-Hutton identified Podarkes as the principal body of a small Jovian asteroid family, using the hierarchical clustering method (HCM), which looks for groupings of neighboring asteroids based on the smallest distances between them in the proper orbital element space. According to the astronomers, the Podarkes family belongs to the larger Menelaus clan, an aggregation of Jupiter trojans which is composed of several families, similar to the Flora family in the inner asteroid belt.[10]:9,10
However this family is not included in David Nesvorný's HCM-analysis from 2014.[11] Instead, Podarkes is listed as a non-family asteroid of the Jovian background population on the Asteroids Dynamic Site (AstDyS) which based on another analysis by Milani and Knežević.[5]
Naming
This minor planet is named after the Greek warrior Podarkes from Greek mythology, 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. The official naming citation was published by the Minor Planet Center on 13 October 2000 (M.P.C. 41386).[12]
Physical characteristics
According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Podarkes measures 28.96 kilometers in diameter, and its surface has an albedo of 0.084,[6] while a generic diameter estimate, based on an absolute magnitude of 11.1 and an albedo at 0.05 gives a larger diameter of approximately 40 kilometers.[7] As of 2018, no rotational lightcurve of Podarkes has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[3][13]
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References
- 1 2 3 4 5 "13062 Podarkes (1991 HN)". Minor Planet Center. Retrieved 29 June 2018.
- 1 2 3 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.
- 1 2 3 4 5 "JPL Small-Body Database Browser: 13062 Podarkes (1991 HN)" (2017-09-23 last obs.). Jet Propulsion Laboratory. Retrieved 29 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 29 June 2018.
- 1 2 "Asteroid (13062) Podarkes – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 June 2018.
- 1 2 3 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. Retrieved 29 June 2018. (online catalog)
- 1 2 "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 29 June 2018.
- ↑ Pilat-Lohinger, E.; Dvorak, R.; Burger, Ch. (January 1999). "Trojans in Stable Chaotic Motion". Celestial Mechanics and Dynamical Astronomy (1/4): 117–126. Bibcode:1999CeMDA..73..117P. doi:10.1023/A:1008338811969. Retrieved 24 June 2017.
- ↑ 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.
- ↑ Roig, F.; Ribeiro, A. O.; Gil-Hutton, R. (June 2008). "Taxonomy of asteroid families among the Jupiter Trojans: comparison between spectroscopic data and the Sloan Digital Sky Survey colors" (PDF). Astronomy and Astrophysics. 483 (3): 911–931. arXiv:0712.0046. Bibcode:2008A&A...483..911R. doi:10.1051/0004-6361:20079177. Retrieved 29 June 2018.
- ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 29 June 2017.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 June 2018.
- ↑ "LCDB Data for (13062) Podarkes". Asteroid Lightcurve Database (LCDB). Retrieved 24 June 2017.
- Robutel, P. and Gabern, F. (2006), The resonant structure of Jupiter's Trojan asteroids – I. Long-term stability and diffusion. Monthly Notices of the Royal Astronomical Society, 372: 1463–1482. doi: 10.1111/j.1365-2966.2006.11008.x
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
- Asteroid 13062 Podarkes at the Small Bodies Data Ferret
- 13062 Podarkes at AstDyS-2, Asteroids—Dynamic Site
- 13062 Podarkes at the JPL Small-Body Database
