2893_Peiroos

2893 Peiroos

2893 Peiroos

Jupiter trojan asteroid

2893 Peiroos /ˈpɪroʊəs/ is a large Jupiter trojan from the Trojan camp, approximately 87 kilometers (54 miles) in diameter. It was discovered on 30 August 1975, by astronomers of the Felix Aguilar Observatory at the Leoncito Astronomical Complex in Argentina.[1] The D-type asteroid has a rotation period of 8.96 hours and belongs to the 40 largest Jupiter trojans.[4] It was named after Peiroos (Peirous) from Greek mythology.[1]

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Orbit and classification

Peiroos is a dark Jovian asteroid orbiting in the trailing Trojan camp at Jupiter's L5 Lagrangian point, 60° behind its orbit in a 1:1 resonance (see Trojans in astronomy).[5] It is a non-family asteroid in the Jovian background population.[6] It orbits the Sun at a distance of 4.8–5.5 AU once every 11 years and 8 months (4,269 days; semi-major axis of 5.15 AU). Its orbit has an eccentricity of 0.08 and an inclination of 15° with respect to the ecliptic.[3]

The body's observation arc begins with its first observation as 1933 BJ at Heidelberg Observatory in January 1933, more than 42 years prior to its official discovery observation at Leoncito.[1]

Physical characteristics

In the Tholen classification, Peiroos has been characterized as a dark D-type asteroid.[13]

Rotation period

In October 1989, a rotational lightcurve of Peiroos was obtained from photometric observations by German and Italian astronomers. Lightcurve analysis gave a well-defined rotation period of 8.96 hours with a brightness variation of 0.30 magnitude (U=3).[11] Between 2015 and 2017, photometric observations by Robert Stephens and collaborators at the Center for Solar System Studies in Landers, California, gave two concurring periods of 8.951 and 8.99 hours, both with an amplitude of 0.31 magnitude (U=3-/3-).[10][12][lower-alpha 1]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Peiroos measures between 86.76 and 87.46 kilometers in diameter and its surface has an albedo between 0.0469 and 0.048.[7][8][9]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0588 and a diameter of 87.67 kilometers based on an absolute magnitude of 8.98.[4]

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Naming

This minor planet was named after Peiroos (Peirous), Thracian war leader from the city of Aenus and an ally of King Priam who fought courageously to defend Troy against the Greek during the Trojan War. The official naming citation was published by the Minor Planet Center on 25 September 1988 (M.P.C. 13608).[16]

Notes

  1. Lightcurve plots of (2893) Peiroos from 2015, 2016 and 2017 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is 3 (lightcurve rating at CS3). Summary figures at the LCDB

References

  1. [1]
    "2893 Peiroos (1975 QD)". Minor Planet Center. Retrieved 1 June 2018.
  2. [2]
    'Pirous' Noah Webster (1884) A Practical Dictionary of the English Language
  3. [3]
    "JPL Small-Body Database Browser: 2893 Peiroos (1975 QD)" (2018-05-25 last obs.). Jet Propulsion Laboratory. Retrieved 1 June 2018.
  4. [4]
    "LCDB Data for (2893) Peiroos". Asteroid Lightcurve Database (LCDB). Retrieved 1 June 2018.
  5. [5]
    "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 1 June 2018.
  6. [6]
    "Asteroid (2893) Peiroos – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 25 May 2018.
  7. [7]
    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. (online, AcuA catalog p. 153)
  8. [8]
    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)
  9. [9]
    Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
  10. [10]
    Stephens, Robert D. (April 2017). "Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2016 October - December". The Minor Planet Bulletin. 44 (2): 123–125. Bibcode:2017MPBu...44..123S. ISSN 1052-8091. PMC 7243949. PMID 32455395.
  11. [11]
    Gonano, M.; di Martino, M.; Mottola, S.; Neukum, G. (December 1990). "Physical study of outer belt asteroids". Space Dust and Debris; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission B /Meetings B2. 11 (12): 197–200. Bibcode:1991AdSpR..11l.197G. doi:10.1016/0273-1177(91)90563-Y. ISSN 0273-1177.
  12. [12]
    Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2016). "A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (3): 265–270. Bibcode:2016MPBu...43..265S. ISSN 1052-8091.
  13. [13]
    "Asteroid 2893 Peiroos". Small Bodies Data Ferret. Retrieved 1 June 2018.
  14. [14]
    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.
  15. [15]
    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.
  16. [16]
    "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 June 2018.
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