584 Semiramis

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	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]
Rotation period	5.068 h (0.2112 d)
Geometric albedo	0.1987±0.011
Absolute magnitude (H)	8.71

Semiramis (minor planet designation: 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]

References

Noah Webster (1884) A Practical Dictionary of the English Language
"584 Semiramis (1906 SY)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 7 May 2016.
Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
Connour, Kyle; Wright, Tyler; French, Linda M. (April 2011), "Upon Further Review: VI. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory", The Minor Planet Bulletin, 42 (1): 4, Bibcode:2015MPBu...42....4C
Sasaki, Takanori; et al. (November 2004), "Mature and Fresh Surfaces on the Newborn Asteroid Karin", The Astrophysical Journal, 615 (2): L161–L164, Bibcode:2004ApJ...615L.161S, doi:10.1086/426431

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