98 Ianthe

98 Ianthe

Discovery
Discovered by	Christian Heinrich Friedrich Peters
Discovery date	April 18, 1868
Designations
Named after	Ianthe
Alternative names
Minor planet category	Main belt
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion	477.729 Gm (3.193 AU)
Perihelion	325.503 Gm (2.176 AU)
Semi-major axis	401.616 Gm (2.685 AU)
Eccentricity	0.190
Orbital period	1606.670 d (4.40 a)
Average orbital speed	18.01 km/s
Mean anomaly	198.904°
Inclination	15.613°
Longitude of ascending node	354.137°
Argument of perihelion	158.566°
Physical characteristics
Dimensions	106.16 ± 3.76 km
Mass	(8.93 ± 1.99) × 1017 kg
Mean density	1.42 ± 0.35 g/cm3
Surface gravity	0.0292 m/s²
Escape velocity	0.0552 km/s
Rotation period	16.479 h
Albedo	0.047
Temperature	~170 K
Spectral type	C
Absolute magnitude (H)	8.84

98 Ianthe (/aɪˈænθiː/ eye-AN-thee) is a large main-belt asteroid, named for three figures in Greek mythology. It is very dark and is composed of carbonates. It was one of the numerous (for his time—the 19th century) discoveries by C. H. F. Peters, who found it on April 18, 1868, from Clinton, New York.

Photometric observations of this asteroid during 2007 at the Organ Mesa Observatory in Las Cruces, New Mexico were used to create a light curve plot. This showed a synodic rotation period of 16.479 ± 0.001 hours and a brightness variation of 0.27 ± 0.02 magnitude during each cycle.