astro.wikisort.org - 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]

2893 Peiroos

Discovery [1]
Discovered by	Felix Aguilar Obs.
Discovery site	El Leoncito Complex
Discovery date	30 August 1975
Designations
MPC designation	(2893) Peiroos
Pronunciation	/ˈpɪroʊəs/[2]
Named after	Peiroos (Peirous)[1] (Greek mythology)
Alternative designations	1975 QD · 1933 BJ 1970 EE · 1979 YV4 1981 AP
Minor planet category	Jupiter trojan [1][3][4] Trojan [5][6] · background [6]
Adjectives	Peiroian
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	85.33 yr (31,166 d)
Aphelion	5.5439 AU
Perihelion	4.7557 AU
Semi-major axis	5.1498 AU
Eccentricity	0.0765
Orbital period (sidereal)	11.69 yr (4,269 d)
Mean anomaly	234.12°
Mean motion	0° 5m 3.48s / day
Inclination	14.663°
Longitude of ascending node	108.77°
Argument of perihelion	171.63°
Jupiter MOID	0.3063 AU
TJupiter	2.9300
Physical characteristics
Mean diameter	86.76±2.05 km[7] 86.88±0.95 km[8] 87.46±6.9 km[9] 87.67 km (derived)[4]
Synodic rotation period	8.951±0.002 h[10][lower-alpha 1] 8.96 h[11] 8.99±0.01 h[12][lower-alpha 1]
Geometric albedo	0.0469±0.008[9] 0.048±0.003[7] 0.048±0.008[8] 0.0588 (derived)[4]
Spectral type	Tholen = D [3][13][4] U–B = 0.252±0.083[13] B–V = 0.720±0.060[14] V–R = 0.470±0.040[14] V–I = 0.950±0.020[4]
Absolute magnitude (H)	8.98[4][11] 9.17±0.33[15] 9.23[3][7][8][9]

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]

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

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 2893 Peiroos at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2893 Peiroos at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (2893) Peiroos

(2893) Peiroos ist ein Asteroid aus der Gruppe der Jupiter-Trojaner. Damit werden Asteroiden bezeichnet, die auf den Lagrange-Punkten auf der Bahn des Jupiter um die Sonne laufen. (2893) Peiroos wurde am 30. August 1975 vom Felix-Aguilar-Observatorium entdeckt.

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- [en] 2893 Peiroos

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[fr] (2893) Piros

(2893) Piros[Quoi ?], désignation internationale (2893) Peiroos, est un astéroïde troyen jovien.

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[ru] (2893) Перой

(2893) Перой (лат. Peiroos, др.-греч. Πειροος) — троянский астероид Юпитера, двигающийся в точке Лагранжа L5, в 60° позади планеты, который принадлежит к спектральному классу D. Астероид был открыт 30 августа 1975 года аргентинскими астрономами в обсерватории Сан-Хуан и назван в честь одного из персонажей древнегреческой мифологии[1].

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