1583 Antilochus

1583 Antilochus

Discovery
Discovered by	Sylvain Julien Victor Arend
Discovery date	19 September 1950
Designations
Named after	Antilochus
Alternative names	1950 SA
Minor planet category	Jupiter Trojan
Orbital characteristics[1][2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc	32616 days (89.30 yr)
Aphelion	5.39305 AU (806.789 Gm)
Perihelion	4.86165 AU (727.292 Gm)
Semi-major axis	5.12735 AU (767.041 Gm)
Eccentricity	0.051820
Orbital period	11.61 yr (4240.70 d)
Average orbital speed	13.17 km/s
Mean anomaly	188.174°
Mean motion	0° 5^m 5.61^s /day
Inclination	28.5209°
Longitude of ascending node	221.392°
Argument of perihelion	188.077°
Earth MOID	3.87099 AU (579.092 Gm)
Jupiter MOID	0.0324682 AU (4.85717 Gm)
Physical characteristics
Dimensions	101.6 km
Mean radius	50.81 ± 1.6 km
Mass	1.1×10^18 kg
Mean density	2.0 g/cm³
Equatorial surface gravity	0.0284 m/s²
Equatorial escape velocity	0.0537 km/s
Rotation period	31.52 h (1.313 d)
Sidereal rotation period	? d
Axial tilt	?°
Pole ecliptic latitude	?
Pole ecliptic longitude	?
Geometric albedo	0.0633 ± 0.004
Temperature	~123 K
Spectral type	D
Absolute magnitude (H)	8.60

1583 Antilochus is a Jupiter Trojan asteroid that orbits in the L₄ Lagrangian point of the Sun-Jupiter system, in the "Greek Camp" of Trojan asteroids. It was named after the Greek hero Antilochus. It was discovered by Sylvain Julien Victor Arend on September 19, 1950, in Uccle, Belgium.

References

1. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
2. "JPL Small-Body Database Browser: 1583 Antilochus (1950 SA)". Jet Propulsion Laboratory. Retrieved 31 March 2016.

External links

• Discovery Circumstances: Numbered Minor Planets
• Orbital simulation from JPL (Java) / Ephemeris

• 1583 Antilochus at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters