1863 Antinous

1863 Antinous
Discovery
Discovered by	C. A. Wirtanen
Discovery site	Lick Obs.
Discovery date	7 March 1948
Designations
MPC designation	(1863) Antinous
Pronunciation	/ænˈtɪnoʊəs/
Named after	Antinous (Greek mythology)
Alternative designations	1948 EA
Minor planet category	Apollo; NEO;
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	68.91 yr (25,168 days)
Earliest precovery date	5 March 1948
Aphelion	3.6293 AU
Perihelion	0.8895 AU
Semi-major axis	2.2594 AU
Eccentricity	0.6063
Orbital period (sidereal)	3.40 yr (1,240 days)
Mean anomaly	139.55°
Mean motion	0° 17m 24.72s / day
Inclination	18.398°
Longitude of ascending node	346.48°
Argument of perihelion	268.00°
Earth MOID	0.1836 AU (71.5 LD)
Physical characteristics
Dimensions	1.80 km (derived); 2.1 km (Gehrels); 3.16 km; 3.23 km;
Synodic rotation period	4.02 h; 4.386±0.004 h; 7.453±0.005 h; 7.4568±0.0017 h; 7.471±0.005 h;
Geometric albedo	0.10; 0.11±0.08; 0.24 (Gehrels); 0.29 (derived);
Spectral type	SU (Tholen); Sq (SMASS); L; SU;
Absolute magnitude (H)	15.00; 15.14±0.03 (R); 15.5; 15.54; 15.62; 15.639±0.058; 15.69±0.14;

1863 Antinous /ænˈtɪnoʊəs/, provisional designation 1948 EA, is a stony asteroid and near-Earth object, approximately 2–3 kilometers in diameter. It was discovered on 7 March 1948 by American astronomer Carl Wirtanen at Lick Observatory on the summit of Mount Hamilton, California. It was named after Antinous from Greek mythology.