58 Concordia

58 Concordia is a fairly large main-belt asteroid that is orbiting the Sun with a period of 4.44 years, a semimajor axis of 2.7 AU, and a low eccentricity of 0.043. It is classified as a C-type asteroid, meaning that its surface is very dark and it is likely carbonaceous in composition. The surface spectra displays indications of hydrated minerals created through aqueous alteration.^[5] The object is rotating with a sidereal period of 9.894541 h and pole orientations of (15.3°±0.7°, −4.2°±2.6°) and (195.9°±1.0°, 4.8°±1.2°).^[6] It belongs to the Hungaria family of asteroids and has a satellite with an orbital period of 14.29 h.^{[3][dubious – discuss]}

58 Concordia

Orbital diagram
Discovery
Discovered by	Karl Theodor Robert Luther
Discovery date	March 24, 1860
Designations
MPC designation	(58) Concordia
Pronunciation	/kənˈkɔːrdiə/[1]
Named after	Concordia
Minor planet category	Main belt Nemesis
Adjectives	Concordian
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion	2.818 AU (421.526 Gm)
Perihelion	2.583 AU (386.457 Gm)
Semi-major axis	2.701 AU (403.991 Gm)
Eccentricity	0.043
Orbital period (sidereal)	4.44 a (1620.946 d)
Mean anomaly	15.122°
Inclination	5.057°
Longitude of ascending node	161.290°
Argument of perihelion	34.465°
Physical characteristics
Dimensions	93.4 km
Mass	~5.89×1017 kg (calculated)
Mean density	1.38 g/cm3 (assumed)[2]
Synodic rotation period	9.895±0.001 h[3]
Geometric albedo	0.058[4]
Spectral type	C
Absolute magnitude (H)	8.86

Concordia was discovered by German astronomer Robert Luther on March 24, 1860. At Luther's request, it was named by Carl Christian Bruhns of the University of Leipzig after Concordia, the Roman goddess of harmony.^[7]