3540 Protesilaos

3540 Protesilaos
Discovery [1]
Discovered by F. Börngen
Discovery site Karl Schwarzschild Obs.
Discovery date 27 October 1973
Designations
MPC designation 3540 Protesilaos
Named after
 Protesilaus
(Greek mythology)[2]
1973 UF5 · 1978 GJ2
1985 VO1
Jupiter trojan [1][3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 62.32 yr (22,762 days)    
Aphelion 5.8927 AU
Perihelion 4.6490 AU
5.2709 AU
Eccentricity 0.1180
12.10 yr (4,420 days)
89.445°
0° 4m 53.04s / day
Inclination 23.297°
26.438°
116.44°
Jupiter MOID 0.5255 AU
Jupiter Tisserand parameter 2.823
Physical characteristics
Dimensions 87.66±3.46 km[4]
70.22±1.08 km[5]
76.84 km (calculated)[3]
8.945 h[6]
8.95±0.02 h[7]
0.062±0.006[4]
0.062±0.014[5]
0.057 (assumed)[3]
C [3]
9.3[1][3]
9.00[4]
9.4[5]
9.38±0.38[8]

    3540 Protesilaos, provisional designation 1973 UF5, is a carbonaceous Jupiter trojan from the Greek camp, approximately 80 kilometers in diameter. It was discovered on 27 October 1973, by German astronomer Freimut Börngen at the Karl Schwarzschild Observatory in Tautenburg, Germany.[9]

    The dark 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) with an eccentricity of 0.12 and an inclination of 23° with respect to the ecliptic. It orbits the Sun at a distance of 4.6–5.9 AU once every 12 years and 1 month (4,420 days).[1] Due to a precovery obtained at the Palomar Observatory in 1953, the body's observation arc begins two decades earlier than its actual discovery date.[9]

    Two rotational light-curves were obtained by astronomer Stefano Mottola at the DLR Institute for Planetary Research (1989), and by Linda French using the Cerro Tololo Inter-American Observatory in Chile (2010). The first light-curve gave a rotation period of 8.945 hours with a brightness amplitude of 0.13 in magnitude (U=2).[6] The second light-curve showed a nearly identical period of 8.95±0.02 hours with no brightness variation given (U=2).[7]

    According to the surveys carried out by the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the Trojan asteroid has a concurring albedo of 0.062, but measures 87.7 and 70.2 kilometers in diameter, respectively.[4][5] The Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.057 and calculates a diameter of 76.8 kilometers.[3]

    The minor planet is named after the hero Protesilaus from Greek mythology. In the Trojan War, he was the first Greek to set foot on the shores of Troy. He was later killed by the Trojan Aeneas, after whom one of the largest Jupiter trojans, 1172 Äneas, is named.[2] Another Jupiter trojan, 13062 Podarkes, is named after his brother Podarkes.

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 3540 Protesilaos (1973 UF5)" (2015-06-11 last obs.). Jet Propulsion Laboratory. Retrieved 11 April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (3540) Protesilaos. Springer Berlin Heidelberg. p. 297. ISBN 978-3-540-00238-3. Retrieved April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (3540) Protesilaos". Asteroid Lightcurve Database (LCDB). Retrieved April 2016.
    4. 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 April 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved April 2016.
    6. 1 2 Mottola, S.; Gonano, M.; Rebhan, H.; Neukum, G. (December 1989). "CCD Photometry of a Trojan Asteroid". Asteroids: 151. Bibcode:1990acm..proc..151M. Retrieved April 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 April 2016.
    8. ↑ 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. Retrieved April 2016.
    9. 1 2 "3540 Protesilaos (1973 UF5)". Minor Planet Center. Retrieved April 2016.

    External links


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