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2893 Peiroos

Jupiter trojan asteroid

Field	Value
minorplanet	yes
name	2893 Peiroos
background	#C2FFFF
discovery_ref
discoverer	Felix Aguilar Obs.
discovery_site	El Leoncito Complex
discovered	30 August 1975
mpc_name	(2893) Peiroos
alt_names	1975 QD1933 BJ
1970 EE
1981 AP
adjective	Peiroian
pronounced
named_after	Peiroos (Peirous)
(Greek mythology)
mp_category	Jupiter trojan
Trojanbackground
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	85.33 yr (31,166 d)
aphelion	5.5439 AU
perihelion	4.7557 AU
semimajor	5.1498 AU
eccentricity	0.0765
period	11.69 yr (4,269 d)
mean_anomaly	234.12°
mean_motion	/ day
inclination	14.663°
asc_node	108.77°
arg_peri	171.63°
jupiter_moid	0.3063 AU
tisserand	2.9300
mean_diameter
87.67 km (derived)
rotation

albedo
(derived)
spectral_type	Tholen D
U–B
B–V
V–R
V–I
abs_magnitude	8.98
9.23

1970 EE 1981 AP (Greek mythology) Trojanbackground

87.67 km (derived)

(derived) U–B
B–V
V–R
V–I

9.23

2893 Peiroos is a large Jupiter trojan from the Trojan camp, approximately 87 km 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 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.

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

Physical characteristics

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

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 (). 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 ().

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.

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.

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).

Notes

References

'Pirous' Noah Webster (1884) ''A Practical Dictionary of the English Language''

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

jupiter-trojans-(trojan-camp) discoveries-by-the-félix-aguilar-observatory named-minor-planets d-type-asteroids-(tholen) astronomical-objects-discovered-in-1975

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