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2148 Epeios

Trojan asteroid

Field	Value
minorplanet	yes
name	2148 Epeios
background	#C2FFFF
discovery_ref
discoverer	R. M. West
discovery_site	La Silla Obs.
discovered	24 October 1976
mpc_name	(2148) Epeios
alt_names	1976 UW
pronounced
named_after	Epeius
(Greek mythology)
mp_category	Jupiter trojan
Greekbackground
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	40.69 yr (14,862 d)
aphelion	5.5118 AU
perihelion	4.9188 AU
semimajor	5.2153 AU
eccentricity	0.0569
period	11.91 yr (4,350 d)
mean_anomaly	243.53°
mean_motion	/ day
inclination	9.1481°
asc_node	176.56°
arg_peri	231.58°
jupiter_moid	0.0308 AU
tisserand	2.9710
mean_diameter
albedo
abs_magnitude	10.8

(Greek mythology) Greekbackground

2148 Epeios is a mid-sized Jupiter trojan from the Greek camp, approximately 38 km in diameter. It was discovered on 24 October 1976, by Danish astronomer Richard Martin West at ESO's La Silla Observatory in northern Chile. The dark Jovian asteroid is the principal body of the proposed Epeios family and was named after Epeius from Greek mythology.

Orbit and classification

Epeios is a Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's Lagrangian point, 60° ahead on its orbit . It orbits the Sun at a distance of 4.9–5.5 AU once every 11 years and 11 months (4,350 days; semi-major axis of 5.22 AU). Its orbit has an eccentricity of 0.06 and an inclination of 9° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at La Silla in October 1976.

Epeios family

Fernando Roig and Ricardo Gil-Hutton identified Epeios as the principal body of a small Jovian asteroid family, using the hierarchical clustering method (HCM), which looks for groupings of neighboring asteroids based on the smallest distances between them in the proper orbital element space. According to the astronomers, the Epeios family belongs to the larger Menelaus clan, an aggregation of Jupiter trojans which is composed of several families, similar to the Flora family in the inner asteroid belt.

However this family is not included in David Nesvorný HCM-analysis from 2014. Instead, Epeios is listed as a non-family asteroid of the Jovian background population on the Asteroids Dynamic Site (AstDyS) which based on another analysis by Milani and Knežević.

Naming

This minor planet was named from Greek mythology after the Greek warrior Epeius, leader of the contingent from Phocis during the Trojan War. Epeius also built the wooden Trojan Horse. He then chose the other 29 soldiers who would accompany him inside. The official was published by the Minor Planet Center on 1 July 1979 (M.P.C. 4788).

Physical characteristics

Rotation period

As of 2018, no rotational lightcurve of Epeios has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Epeios measures 37.98 kilometers in diameter and its surface has an albedo of 0.064.

References

'Epeus' in 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-(greek-camp) discoveries-by-richard-martin-west named-minor-planets astronomical-objects-discovered-in-1976

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