2893 Peiroos 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. The  D-type asteroid has a rotation period of 8.96 hours and belongs to the 40 largest Jupiter trojans. It was named after  Peiroos (Peirous) from Greek mythology.
Orbit and classification Peiroos is a dark Jovian asteroid orbiting in the trailing Trojan camp at Jupiter's L 5 Lagrangian point, 60 ° behind its orbit in a 1:1 resonance (see . Trojans in astronomy) It is a non-  family asteroid in the Jovian background population. 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.
observation arc begins with its first observation as at 1933 BJ Heidelberg Observatory in January 1933, more than 42 years prior to its official discovery observation at Leoncito.
Tholen classification, Peiroos has been characterized as a dark D-type asteroid.
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 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-  
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.  
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.
100+ largest Jupiter trojans
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
^ a b c Lightcurve plots of (2893) Peiroos from
2015, 2016 and 2017 by Robert Stephens at the Center for Solar System Studies ( ). Quality code is 3 (lightcurve rating at CS3). Summary figures at the U81 LCDB
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"Asteroid (2893) Peiroos – Proper Elements". AstDyS-2, Asteroids – Dynamic Site . Retrieved . 25 May 2018
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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.
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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.
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