584 Semiramis

584 Semiramis is a minor planet orbiting the Sun within the main asteroid belt. Photometric observations at the Mark Evans Observatory during 2014 gave a rotation period of 5.0689 ± 0.0001 hours. This value is in close agreement with previous studies.^[4] The spectrum shows it to be a stony S(IV)-type asteroid.^[5]

584 Semiramis

A three-dimensional model of 584 Semiramis based on its light curve
Discovery
Discovered by	A. Kopff
Discovery site	Heidelberg
Discovery date	15 January 1906
Designations
MPC designation	(584) Semiramis
Pronunciation	/sɪˈmɪrəmɪs/[1]
Named after	Semiramis
Alternative designations	1906 SY
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	110.26 yr (40272 d)
Aphelion	2.9282 AU (438.05 Gm)
Perihelion	1.8224 AU (272.63 Gm)
Semi-major axis	2.3753 AU (355.34 Gm)
Eccentricity	0.23276
Orbital period (sidereal)	3.66 yr (1337.1 d)
Mean anomaly	166.35°
Mean motion	0° 16m 9.228s / day
Inclination	10.718°
Longitude of ascending node	282.159°
Argument of perihelion	85.121°
Physical characteristics
Mean radius	27.005±0.7 km[2] 25.89 ± 1.075 km[3]
Mass	(8.23 ± 5.77) × 1017 kg[3]
Synodic rotation period	5.068 h (0.2112 d)
Geometric albedo	0.1987±0.011
Absolute magnitude (H)	8.71