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5284 Orsilocus

Trojan asteroid

Field	Value
minorplanet	yes
name	5284 Orsilocus
background	#C2FFFF
discovery_ref
discoverer	C. S. Shoemaker
E. M. Shoemaker
discovery_site	Palomar Obs.
discovered	1 February 1989
mpc_name	(5284) Orsilocus
alt_names
adjective	Orsilocian
pronounced
named_after	Orsilochus (Orsilocus)
(Greek mythology)
mp_category	Jupiter trojan
Greekbackground
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	65.27 yr (23,840 d)
aphelion	5.6580 AU
perihelion	4.7937 AU
semimajor	5.2259 AU
eccentricity	0.0827
period	11.95 yr (4,364 d)
mean_anomaly	203.67°
mean_motion	/ day
inclination	20.225°
asc_node	102.75°
arg_peri	343.29°
jupiter_moid	0.3804 AU
tisserand	2.8700
mean_diameter
53.16 km (calculated)
rotation
albedo	(assumed)

spectral_type	D (Pan-STARRS)
D (SDSS-MOC)
V–I
abs_magnitude	10.0
10.1

E. M. Shoemaker (Greek mythology) Greekbackground 53.16 km (calculated)

D (SDSS-MOC) V–I
10.1

5284 Orsilocus is a Jupiter trojan from the Greek camp, approximately 50 km in diameter. It was discovered on 1 February 1989, by American astronomers Carolyn and Eugene Shoemaker at the Palomar Observatory in California. The D-type asteroid belongs the 100 largest Jupiter trojans and has a rotation period of 10.3 hours. It was named after the hero Orsilochus (Orsilocus) from Greek mythology.

Orbit and classification

Orsilocus 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 4.8–5.7 AU once every 11 years and 11 months (4,364 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.08 and an inclination of 20° with respect to the ecliptic. The body's observation arc begins with a precovery at Palomar in February 1953, or 36 years prior to its official discovery observation.

Physical characteristics

In the SDSS-based taxonomy, Orsilocus is a D-type asteroid, the most common spectral type among the larger Jupiter trojans. It has also been characterized as a D-type by Pan-STARRS' survey, while the Collaborative Asteroid Lightcurve Link (CALL) assumes it to be a carbonaceous C-type asteroid. Its V–I color index of 0.97 is typical for most larger Jovian asteroids.

Rotation period

In February 2013, a rotational lightcurve of Orsilocus was obtained from photometric observations by Robert Stephens at the Center for Solar System Studies (CS3) in Landers, California. Lightcurve analysis gave a rotation period of hours with a variation amplitude of 0.12 magnitude ().

In 2015 and 2016, follow-up observations by Stephens at the CS3 gave two concurring periods of and hours with an amplitude of 0.20 and 0.16 magnitude, respectively ().

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Orsilocus measures 50.16 kilometers in diameter and its surface has an albedo of 0.070, while CALL 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 Orsilochus, son of Diocles (Diokles) and twin brother of Crethon (see 5285 Krethon). The Achaean warrior fought under Agamemnon and Menelaus in the Trojan War, where he was slain by Aeneas. The official naming citation was published by the Minor Planet Center on 12 July 1995 (M.P.C. 25444).

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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