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4805 Asteropaios

Trojan asteroid

Field	Value
minorplanet	yes
name	4805 Asteropaios
background	#C2FFFF
discovery_ref
discoverer	C. Shoemaker
discovery_site	Palomar Obs.
discovered	13 November 1990
mpc_name	(4805) Asteropaios
alt_names
adjective	Asteropaian
pronounced
named_after	Asteropaios
(Greek mythology)
mp_category	Jupiter trojan
Trojanbackground
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	64.39 yr (23,520 d)
aphelion	5.6775 AU
perihelion	4.7410 AU
semimajor	5.2093 AU
eccentricity	0.0899
period	11.89 yr (4,343 d)
mean_anomaly	145.07°
mean_motion	/ day
inclination	12.014°
asc_node	278.39°
arg_peri	90.347°
jupiter_moid	0.0068 AU
tisserand	2.9480
mean_diameter

rotation
albedo

spectral_type	C (assumed)
abs_magnitude	9.9
10.0
10.10

(Greek mythology) Trojanbackground

10.0 10.10

4805 Asteropaios is a Jupiter trojan from the Trojan camp, approximately 53 km in diameter. It was discovered on 13 November 1990, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The dark Jovian asteroid is one of the 80 largest Jupiter trojans and has a rotation period of 12.4 hours. It was named after the spear-throwing hero Asteropaios, from Greek mythology.

Orbit and classification

Asteropaios is a dark Jovian asteroid orbiting in the trailering Trojan camp at Jupiter's Lagrangian point, 60° behind on the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid of the Jovian background population.

It orbits the Sun at a distance of 4.7–5.7 AU once every 11 years and 11 months (4,343 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.09 and an inclination of 12° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Palomar in December 1953, almost 37 years prior to its official discovery observation.

Physical characteristics

Asteropaios is an assumed, carbonaceous C-type asteroid.

Rotation period

In February 1994, a rotational lightcurve of Asteropaios was obtained from photometric observations by Stefano Mottola and Anders Erikson using the former ESO 1-metre telescope at La Silla Observatory in Chile. Lightcurve analysis gave a well-defined rotation period of hours with a brightness amplitude of 0.26 magnitude ().

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Asteropaios measures 43.44 and 57.65 kilometers in diameter and its surface has an albedo of 0.085 and 0.058, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 53.16 kilometers based on an absolute magnitude of 10.1.

Naming

This minor planet was named from Greek mythology after Asteropaios, commander of the Trojan-allied Paeonians during the Trojan War. The ambidextrous, spear-throwing warrior was able to draw blood from Achilles but was slain in the combat. The official naming citation was published by the Minor Planet Center on 27 June 1991 (M.P.C. 18466).

References

'Asteropæus' in Noah Webster (1884) ''A Practical Dictionary of the English Language'', modified for the spelling ''-ai-''

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.

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