4832_Palinurus

4832 Palinurus

4832 Palinurus

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4832 Palinurus /pælɪˈnjʊərəs/ is a Jupiter trojan from the Trojan camp, approximately 52 kilometers (32 miles) in diameter. It was discovered on 12 October 1988, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The dark D-type asteroid belongs to the 90 largest Jupiter trojans and has a short rotation period of 5.3 hours.[7] It was named after Aeneas' navigator, Palinurus, from Greek mythology.[1]

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Orbit and classification

Palinurus is a Jovian asteroid in the so-called Trojan camp, located in the L5 Lagrangian point, 60° behind Jupiter, orbiting in a 1:1 resonance with the Gas Giant (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 4.5–6.0 AU once every 12 years and 1 month (4,416 days; semi-major axis of 5.27 AU). Its orbit has an eccentricity of 0.14 and an inclination of 19° with respect to the ecliptic.[3] The body's observation arc begins at Palomar in September 1988, one month prior to its official discovery observation.[1]

Physical characteristics

In the SDSS-based taxonomy, Palinurus is a dark D-type asteroid.[10] Pan-STARRS' survey has also characterized it as a D-type, which is the most common spectral type among the larger Jupiter trojans. It has a high V–I color index of 1.00.[7][9][11]

Rotation period

In July 2010, a rotational lightcurve of Palinurus was obtained during eight consecutive nights by Italian astronomer Stefano Mottola at the Calar Alto Observatory in Spain. Lightcurve analysis gave a rotation period of 5.319±0.002 hours with a brightness variation of 0.09 magnitude (U=2-).[7][8]

In January 2015, photometric observations by Robert Stephens at the Center for Solar System Studies in Landers, California, determined a period of 5.85±0.01 hours with an amplitude of 0.16 magnitude based on a fragmentary lightcurve (U=1).[7][12][lower-alpha 1]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Palinurus measures 52.06 kilometers in diameter and its surface has an albedo of 0.071,[6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a C-type asteroid of 0.057 and calculates a similar diameter of 53.16 kilometers based on an absolute magnitude of 10.1.[7]

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Naming

This minor planet was named by the discoverer from Greek mythology after Palinurus, the great helmsman of Aeneas's ship. After the fall of Troy in the Trojan War, he led the rest of the Trojan fleet to Carthage, Sicily, and finally to Italy. The official naming citation was published by the Minor Planet Center on 25 August 1991 (M.P.C. 18647).[13]

Notes

  1. Lightcurve plot of (4832) Palinurus from Feb 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 website.

References

  1. [1]
    "4832 Palinurus (1988 TU1)". Minor Planet Center. Retrieved 16 June 2018.
  2. [2]
    Noah Webster (1884) A Practical Dictionary of the English Language
  3. [3]
    "JPL Small-Body Database Browser: 4832 Palinurus (1988 TU1)" (2018-05-19 last obs.). Jet Propulsion Laboratory. Retrieved 16 June 2018.
  4. [4]
    "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 16 June 2018.
  5. [5]
    "Asteroid (4832) Palinurus – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 16 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. (online catalog)
  7. [7]
    "LCDB Data for (4832) Palinurus". Asteroid Lightcurve Database (LCDB). Retrieved 16 June 2018.
  8. [8]
    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.
  9. [9]
    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. S2CID 53493339.
  10. [10]
    Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 30 October 2019. (PDS data set)
  11. [11]
    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.
  12. [12]
    Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2015). "Dispatches from the Trojan Camp - Jovian Trojan L5 Asteroids Observed from CS3: 2014 October - 2015 January". The Minor Planet Bulletin. 42 (3): 216–224. Bibcode:2015MPBu...42R.216S. ISSN 1052-8091.
  13. [13]
    "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 16 June 2018.
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