22 Kalliope

22 Kalliope
	Kalliope and satellite Linus as seen by the W.M. Keck II telescope in 2010
Discovery
Discovered by	John Russell Hind
Discovery date	16 November 1852
Designations
MPC designation	(22) Kalliope
Pronunciation	/kəˈlaɪ.əpi/ kə-LY-ə-pee
Named after	Καλλιόπη Kalliopē
Minor planet category	Main belt
Adjectives	Kalliopean /kəˌlaɪ.əˈpiːən/ kə-LY-ə-PEE-ən
Orbital characteristics
	Epoch 23 July 2010 (JD 2455400.5)
Aphelion	479.98 Gm (3.2085 AU)
Perihelion	391.03 Gm (2.6139 AU)
Semi-major axis	435.09 Gm (2.9112 AU)
Eccentricity	0.10213
Orbital period (sidereal)	1814.3 d (4.97 yr)
Mean anomaly	282.54°
Inclination	13.703°
Longitude of ascending node	66.17°
Argument of perihelion	355.03°
Known satellites	Linus
Physical characteristics
Dimensions	235 km × 144 km × 124 km; 190 km × 125 km
Mean diameter	150±5 km; 166.2±2.8 km; 167.536±3.053 km; 181.0±4.6 km (IRAS);
Flattening	0.41
Mass	(7.7±0.4)×1018 kg; (8.16±0.26)×1018 kg; 7.36×1018 kg; (6.30±0.50)×1018 kg
Mean density	4.36±0.50 g/cm3; 3.35±0.33 g/cm3; 2.37±0.40 g/cm3; 2.03±0.16 g/cm3;
Synodic rotation period	0.17285 days (4.1483 h)
Geometric albedo	0.198; 0.17; 0.166 ± 0.005
Spectral type	M (Tholen); X (SMASS); X (Bus-DeMeo);
Absolute magnitude (H)	6.81

22 Kalliope (/kəˈlaɪ.əpi/; kə-LY-ə-pee) is a large M-type asteroid from the asteroid belt discovered by J. R. Hind on 16 November 1852. It is named after Calliope, the Greek Muse of epic poetry. It is orbited by a small moon named Linus.