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Discovery
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| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | April 18, 1868 |
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Designations
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| Named after | Ianthe |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| 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° |
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Physical characteristics
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| Dimensions | 104.5 km |
| Mass | 1.2×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0292 m/s² |
| Escape velocity | 0.0552 km/s |
| Rotation period | ? d |
| Albedo | 0.047 [1] |
| 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 the various Ianthe 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.
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