3709 Polypoites

3709 Polypoites
Discovery [1]
Discovered by C. Shoemaker
Discovery site Palomar Obs.
Discovery date 14 October 1985
Designations
MPC designation 3709 Polypoites
Named after
 Polypoites
(Greek mythology)[2]
1985 TL3 · 1971 OK1
1979 HQ2 · 1985 WK
Jupiter trojan [3][4]
(Greek camp)
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 36.99 yr (13,509 days)
Aphelion 5.5575 AU
Perihelion 4.9278 AU
5.2427 AU
Eccentricity 0.0601
12.00 yr (4,385 days)
153.32°
0° 4m 55.56s / day
Inclination 19.623°
187.15°
246.80°
Jupiter MOID 0.0845 AU
Jupiter Tisserand parameter 2.8800
Physical characteristics
Dimensions 65.30±0.89 km[5]
85.23±2.50 km[6]
99.09±15.1 km (IRAS:11)[1][3]
5.71±0.02 h[7]
14.19±0.02 h[8]
43 h[9]
0.0452±0.018 (IRAS:11)[1]
0.062±0.004[6]
0.087±0.017[5]
C [3]
9.0[1][3][6]
9.2[5]
9.31±0.46[10]

    3709 Polypoites, provisional designation 1985 TL3, is a large and very dark Jupiter trojan from the Greek camp, approximately 99 kilometers in diameter. It was discovered by American female astronomer Carolyn Shoemaker at the U.S. Palomar Observatory, California, on 14 October 1985.[4]

    The carbonaceous C-type asteroid 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 4.9–5.6 AU once every 12.01 years (4,385 days). Its orbit has an eccentricity of 0.06 and an inclination of 20° with respect to the plane of the ecliptic.[1] The first used observation was made at the discovering observatory on 21 September 1985, extending the asteroid's observation arc by just 23 days prior to its discovery, while the first unused observation at Crimea–Nauchnij dates back to 1971.[4]

    In April 2015, the first reliable photometric light-curve analysis by Robert Stevens at the U.S. Center for Solar System Studies, California, rendered a rotation period of 14.19±0.02 hours with a brightness variation of 0.15 in magnitude (U=3-).[8] Previous observations from 2007 and 2010, were based on fragmentary light curves and gave 43 and 5.71 hours, respectively (U=1+/1).[9][7]

    According to 11 observations made by the Infrared Astronomical Satellite, IRAS, the Trojan asteroid measures 99 kilometers and has a very low albedo of 0.045.[1] Other space-based surveys diverge significantly with higher albedos and smaller diameters: while the Japanese Akari satellite, gives an albedo of 0.062 and a diameter of 85.2,[6] the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer finds an albedo of 0.087 and a diameter of 65.3 kilometers.[5] The Collaborative Asteroid Lightcurve Link gives preference to the observations performed by IRAS.[3]

    The minor planet was named after the Greek hero Polypoites, who fought during the Trojan War. In a competition among the Greek warriors he was able to throw an iron meteorite the farthest and won the game against Leonteus, after whom the minor planet 3793 Leonteus is named. On landing, the meteorite formed an impact crater. The body's name was suggested by Dorothy and Jerome Preston, with the remark that, had the Shoemakers been present, they would have examined the event closely.[2] Naming citation was published on 2 April 1988 (M.P.C. 12976).[11]

    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 3709 Polypoites (1985 TL3)" (2016-04-18 last obs.). Jet Propulsion Laboratory. Retrieved 24 May 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (3709) Polypoites. Springer Berlin Heidelberg. p. 313. ISBN 978-3-540-00238-3. Retrieved 24 May 2016.
    3. 1 2 3 4 5 "LCDB Data for (3709) Polypoites". Asteroid Lightcurve Database (LCDB). Retrieved 24 May 2016.
    4. 1 2 3 "3709 Polypoites (1985 TL3)". Minor Planet Center. Retrieved 24 May 2016.
    5. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 24 May 2016.
    6. 1 2 3 4 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. Retrieved 24 May 2016.
    7. 1 2 French, Linda M.; Stephens, Robert D.; Lederer, Susan M.; Coley, Daniel R.; Rohl, Derrick A. (April 2011). "Preliminary Results from a Study of Trojan Asteroids". The Minor Planet Bulletin. 38 (2): 116–120. Bibcode:2011MPBu...38..116F. ISSN 1052-8091. Retrieved 24 May 2016.
    8. 1 2 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. Retrieved 24 May 2016.
    9. 1 2 Molnar, Lawrence A.; Haegert, Melissa, J.; Hoogeboom, Kathleen M. (June 2008). "Lightcurve Analysis of an Unbiased Sample of Trojan Asteroids". The Minor Planet Bulletin. 35 (2): 82–84. Bibcode:2008MPBu...35...82M. ISSN 1052-8091. Retrieved 24 May 2016.
    10. ↑ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 24 May 2016.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 May 2016.

    External links

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