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5511 Cloanthus

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5511 Cloanthus
Hubble Space Telescope image of Cloanthus taken in 2012
Discovery [1]
Discovered byC. S. Shoemaker
E. M. Shoemaker
Discovery sitePalomar Obs.
Discovery date8 October 1988
Designations
(5511) Cloanthus
Pronunciation/kloʊˈænθəs/
Named after
Cloanthus [1]
(Greco-Roman mythology)
1988 TH1 · 1989 VU3
1989 WA7
Jupiter trojan [1][2]
Trojan [3] · background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc66.82 yr (24,405 d)
Aphelion5.8529 AU
Perihelion4.6339 AU
5.2434 AU
Eccentricity0.1162
12.01 yr (4,385 d)
240.47°
0° 4m 55.56s / day
Inclination11.167°
172.67°
121.33°
Jupiter MOID0.0098 AU
TJupiter2.9490
Physical characteristics
39.77±0.43 km[5]
48.48 km (assumed)[6]
336±7 h[7]
0.057 (assumed)[6]
0.093±0.013[5]
C (assumed)[6]
B–V = 0.690±0.060[8]
V–R = 0.480±0.040[8]
V–I = 0.890±0.044[6]
BR = 1.210±0.057[6]
10.20[5]
10.3[1][2][6]

5511 Cloanthus /kloʊˈænθəs/ is a Jupiter trojan from the Trojan camp, approximately 40 kilometers (25 miles) in diameter. It was discovered on 8 October 1988, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California.[1] The dark and likely elongated Jovian asteroid is a slow rotator with a long rotation period of possibly 336 hours.[6] It was named after the wandering Trojan Cloanthus from Classical mythology.[1]

Orbit and classification[edit]

Cloanthus is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the trailing Trojan camp at its L5 Lagrangian point, 60° behind 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 4.6–5.9 AU once every 12 years (4,385 days; semi-major axis of 5.24 AU). Its orbit has an eccentricity of 0.12 and an inclination of 11° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar in July 1951, more than 37 years prior to its official discovery observation.[1]

Naming[edit]

This minor planet was named from Greco-Roman mythology after the Trojan Cloanthus, a companion of Aeneas in Classical mythology. He is one of the wandering Aeneads who traveled to Italy after the downfall of Troy. At the funeral games for Aeneas' father, Anchises, Cloanthus was the winner of the boat race because he called upon the gods of the sea to help him with his heavier ship.[1] The official naming citation was published by the Minor Planet Center on 12 July 1995 (M.P.C. 25444).[9] Other Jovian asteroids named after members of the Aeneads include 4827 Dares, 4828 Misenus, 5120 Bitias and 9023 Mnesthus.

Physical characteristics[edit]

Cloanthus is an assumed, carbonaceous C-type asteroid.[6] Most Jupiter trojans are D-types, with the remainder being mostly C and P-type asteroids. It has a V–I color index of 0.890 and a BR color of 1.21 (also see table below).[6]

Rotation period[edit]

In July 2010, a rotational lightcurve of Cloanthus was obtained from photometric observations by Italian astronomer Stefano Mottola using the 1.2-meter telescope at Calar Alto Observatory in Spain. Lightcurve analysis gave a very long rotation period of 336±7 hours with a high brightness amplitude of at least 0.49 magnitude, indicative of an elongated, rather than spherical shape.[6][7] Due to the lightcurve's low quality rating (U=2-), it is only a potentially slow rotator.[6]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Cloanthus measures 39.77 kilometers in diameter and its surface has an albedo of 0.093,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 48.48 kilometers based on an absolute magnitude of 10.3.[6]

100+ largest Jupiter trojans

References[edit]

  1. ^ Jump up to: a b c d e f g h "5511 Cloanthus (1988 TH1)". Minor Planet Center. Retrieved 27 June 2018.
  2. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 5511 Cloanthus (1988 TH1)" (2018-05-24 last obs.). Jet Propulsion Laboratory. Retrieved 27 June 2018.
  3. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 27 June 2018.
  4. ^ Jump up to: a b "Asteroid (5511) Cloanthus – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 27 June 2018.
  5. ^ 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)
  6. ^ Jump up to: a b c d e f g h i j k l "LCDB Data for (5511) Cloanthus". Asteroid Lightcurve Database (LCDB). Retrieved 27 June 2018.
  7. ^ 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.
  8. ^ Jump up to: a b Chatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016). "Photometric colors of the brightest members of the Jupiter L5 Trojan cloud". Icarus. 271: 158–169. Bibcode:2016Icar..271..158C. doi:10.1016/j.icarus.2016.01.026.
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 June 2018.

External links[edit]

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