11252_Laërtes

11252 Laërtes

11252 Laërtes

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11252 Laërtes (/leɪˈɜːrtiːz/ lay-UR-teez; provisional designation 1973 SA2) is a mid-sized Jupiter trojan from the Greek camp, approximately 41 kilometers (25 miles) in diameter. It was discovered during a follow-up campaign of the Palomar–Leiden survey in 1973, and named after the King Laërtes from Greek mythology. The dark Jovian asteroid has a rotation period of 9.2 hours.[8]

Quick Facts Discovery, Discovered by ...

Discovery

It was discovered on 19 September 1973, by Dutch astronomer couple Ingrid and Cornelis van Houten on photographic plates taken by Dutch–American astronomer Tom Gehrels at the Palomar Observatory in California.[1] The first precovery was taken at the discovering observatory in 1951, extending the asteroid's observation arc by 22 years prior to its discovery.[1]

As an anomaly, the asteroid did not receive a typical survey designation, although it was discovered in 1973, when the discovering trio of astronomers were conducting their second Palomar–Leiden Trojan survey (T-2).

Orbit and classification

Laërtes is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's L4 Lagrangian point, 60° ahead on its orbit (see Trojans in astronomy).[4] It is also a non-family asteroid of the Jovian background population.[5] It orbits the Sun at a distance of 5.0–5.3 AU once every 11 years and 8 months (4,260 days; semi-major axis of 5.14 AU). Its orbit has an eccentricity of 0.03 and an inclination of 6° with respect to the ecliptic.[3]

Physical characteristics

Laërtes is an assumed C-type asteroid, while the dominant type among the Jovian asteroid population is that of a D-type.[8]

Rotation period

In March 2015, a rotational lightcurve of Laërtes was obtained by Robert Stephens at the Center for Solar System Studies in California. The photometric observations showed a rotation period of 9.15±0.03 hours with a brightness variation of 0.18 magnitude (U=2).[7][lower-alpha 1]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 41.09 kilometers in diameter, and its surface has an albedo of 0.060,[6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous bodies of 0.057 and calculates a diameter of 42.23 kilometers with an absolute magnitude of 10.6.[8]

More information Largest Jupiter Trojans by survey(A) (mean-diameter in kilometers; YoD: Year of Discovery), Designation ...
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Naming

This minor planet was named for Laërtes, the king of Ithaca, Argonaut, husband of Anticleia, and father of Odysseus. The father of Laërtes was Arcisius, a son of the sky and thunder god and ruler of Mount Olympus, Zeus. The minor planets 651 Antikleia, 1143 Odysseus, 1151 Ithaka, 5731 Zeus were all named after these figures and places from Greek mythology.[2] The approved naming citation was published by the Minor Planet Center on 24 January 2000 (M.P.C. 38200).[9]

Notes

  1. Lightcurve plots of (11252) Laërtes from March 2015 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is 2+ (lightcurve rating at CS3). Summary figures at the LCDB and CS3.

References

  1. [1]
    "11252 Laertes (1973 SA2)". Minor Planet Center. Retrieved 22 June 2018.
  2. [2]
    Schmadel, Lutz D. (2007). "(11252) Laërtes". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 757. doi:10.1007/978-3-540-29925-7_8276. ISBN 978-3-540-00238-3.
  3. [3]
    "JPL Small-Body Database Browser: 11252 Laertes (1973 SA2)" (2017-07-04 last obs.). Jet Propulsion Laboratory. Archived from the original on 19 August 2020. Retrieved 22 June 2018.
  4. [4]
    "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 22 June 2018.
  5. [5]
    "Asteroid (11252) Laërtes – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 22 June 2018.
  6. [6]
    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. Retrieved 22 June 2018. (online catalog)
  7. [7]
    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 22 June 2018.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  8. [8]
    "LCDB Data for (11252) Laërtes". Asteroid Lightcurve Database (LCDB). Retrieved 22 June 2018.
  9. [9]
    "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 22 June 2018.
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