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3240 Laocoon

Trojan asteroid

Field	Value
minorplanet	yes
name	3240 Laocoon
background	#C2FFFF
discovery_ref
discovered	7 November 1978
discoverer	E. F. Helin
S. J. Bus
discovery_site	Palomar Obs.
mpc_name	(3240) Laocoon
alt_names

adjective	Laocoontian
pronounced
named_after	Laocoön
(Greek mythology)
mp_category	Jupiter trojan
Trojanbackground
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	41.65 yr (15,212 d)
aphelion	5.8990 AU
perihelion	4.5704 AU
semimajor	5.2347 AU
eccentricity	0.1269
period	11.98 yr (4,375 d)
mean_anomaly	204.44°
mean_motion	/ day
inclination	2.3352°
asc_node	296.28°
arg_peri	15.393°
jupiter_moid	0.3117 AU
tisserand	2.9820
mean_diameter
rotation
albedo
spectral_type	D (Pan-STARRS)
D (SDSS-MOC)
B–V
V–R
V–I
abs_magnitude	10.1
10.2

S. J. Bus

(Greek mythology) Trojanbackground D (SDSS-MOC) B–V
V–R
V–I
10.2

3240 Laocoon is a carbonaceous Jupiter trojan from the Trojan camp, approximately 51 km in diameter. It was discovered on 7 November 1978, by American astronomers Eleanor Helin and Schelte Bus at Palomar Observatory in California. The D-type asteroid belongs to the 100 largest Jupiter trojans and has a rotation period of 11.3 hours. It was named after Laocoön from Greek mythology.

Classification and orbit

Laocoon resides in the Trojan camp of Jupiter's Lagrangian point, which lies 60° behind the gas giant's orbit. It is also a non-family asteroid of the Jovian background population.

It orbits the Sun at a distance of 4.6–5.9 AU once every 11 years and 12 months (4,375 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic. The asteroid was first observed as ** at Crimea–Nauchnij in September 1976, extending the body's observation arc by 2 years prior to its official discovery at Palomar.

Physical characteristics

Laocoon has been characterized as a D-type asteroid by Pan-STARRS survey and in the SDSS-based taxonomy. It has a V–I color index of 0.88.

Lightcurve

In April 1996, Laocoon was observed by Italian astronomer Stefano Mottola using the now decommissioned Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile. The lightcurve gave a rotation period of hours with a brightness variation of in magnitude ().

Diameter and albedo

According to the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the Jovian asteroid measures 51.7 kilometers in diameter and its surface has an albedo of 0.060, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 50.8 kilometers with an absolute magnitude of 10.2.

Naming

This minor planet was named after the Troyan priest Laocoön from Greek mythology. He and both his sons were killed by serpents sent by the gods because he tried to expose the Greek's deception of the Trojan Horse. The official naming citation was published by the Minor Planet Center on 7 September 1987 (M.P.C. 12210).

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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