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5126 Achaemenides

Trojan asteroid

Field	Value
minorplanet	yes
name	5126 Achaemenides
background	#C2FFFF
discovery_ref
discoverer	C. Shoemaker
discovery_site	Palomar Obs.
discovered	1 February 1989
mpc_name	(5126) Achaemenides
alt_names
adjective	Achaemenidian
pronounced
named_after	Achaemenides
(Greek mythology)
mp_category	Jupiter trojan
Greekbackground
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	65.36 yr (23,871 d)
aphelion	5.3722 AU
perihelion	5.1131 AU
semimajor	5.2427 AU
eccentricity	0.0247
period	12.00 yr (4,385 d)
mean_anomaly	180.28°
mean_motion	/ day
inclination	29.863°
asc_node	116.50°
arg_peri	353.06°
jupiter_moid	0.1391 AU
tisserand	2.7330
mean_diameter

rotation
albedo

spectral_type	C (assumed)
abs_magnitude	10.10
10.3
10.5

(Greek mythology) Greekbackground

10.3 10.5

5126 Achaemenides is a Jupiter trojan from the Greek camp, approximately 50 km in diameter. It was discovered on 1 February 1989, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The dark Jovian asteroid belongs the 100 largest Jupiter trojans and has a long rotation period of 32.4 hours. It was named after one of Odysseus's crew members, Achaemenides, from Greek mythology.

Orbit and classification

Achaemenides is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance . It is also a non-family asteroid in the Jovian background population. It orbits the Sun at a distance of 5.1–5.4 AU once every 12 years (4,385 days; semi-major axis of 5.24 AU). Its orbit has an eccentricity of 0.02 and an inclination of 30° with respect to the ecliptic. The body's observation arc begins with a precovery at Palomar in January 1953, more than 36 years prior to its official discovery observation.

Physical characteristics

Achaemenides is an assumed C-type asteroid.

Rotation period

In April 22015, a rotational lightcurve of Achaemenides was obtained from photometric observations by Daniel Coley at the Center for Solar System Studies, in collaboration with Robert Stephens and Linda French. Lightcurve analysis gave a rotation period of hours with a brightness amplitude of 0.36 magnitude (). While not being a slow rotator, Achaemenides has one of the longest periods of all larger Jupiter trojans (see table below).

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, Achaemenides measures 48.57 and 51.92 kilometers in diameter and its surface has an albedo of 0.068 and 0.050, respectively.

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 44.22 kilometers based on an absolute magnitude of 10.5.

Naming

This minor planet was named from Greek mythology after the Greek warrior Achaemenides, one of few surviving members of Odysseus's crew. Left behind when Odysseus fled the blinded Cyclops, he was later rescued by the Trojan Aeneas. The official naming citation was published by the Minor Planet Center on 4 June 1993 (M.P.C. 22249).

Notes

References

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.

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