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Discovery[1] and designation
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| Discovered by | Alphonse Borrelly |
| Discovery date | May 28, 1868 |
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Designations
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| Named after | Dike |
| Alternate name(s) | A915 BA; 1935 UC; 1935 YL; 1939 UT; 1948 UE; 1948 WC; 1961 XJ; 1974 VB |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 476.928 Gm (3.188 AU) |
| Perihelion | 320.005 Gm (2.139 AU) |
| Semi-major axis | 398.467 Gm (2.664 AU) |
| Eccentricity | 0.197 |
| Orbital period | 1587.810 d (4.35 a) |
| Average orbital speed | 18.07 km/s |
| Mean anomaly | 304.205° |
| Inclination | 13.858° |
| Longitude of ascending node | 41.678° |
| Argument of perihelion | 196.045° |
| Dimensions | 71.9 km |
| Mass | ~3.9×1017 kg |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | ~0.0201 m/s² |
| Equatorial escape velocity | ~0.0380 km/s |
| Sidereal rotation period |
0.4313 d (10.35 h)[1] |
| Axial tilt | ?° |
| Pole ecliptic latitude | ? |
| Pole ecliptic longitude | ? |
| Geometric albedo | 0.058 [2] |
| Temperature | ~172 K |
| Spectral type | C |
| Absolute magnitude (H) | 9.43 |
99 Dike ( /ˈdaɪkiː/ dy-kee) is a quite large and dark main-belt asteroid. Dike was discovered by Alphonse Borrelly on May 28, 1868. It was his first asteroid discovery. It is named after Dike, the Greek goddess of moral justice.
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