| Discovery[1] and Designation | |
|---|---|
| Discovered by: | Alphonse Borrelly |
| Discovery date: | May 28, 1868 |
| Orbital characteristics[2] | |
| 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) |
| Avg. orbital speed: | 18.07 km/s |
| Mean anomaly: | 304.205° |
| Inclination: | 13.858° |
| Longitude of ascending node: | 41.678° |
| Argument of perihelion: | 196.045° |
| Physical characteristics | |
| 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: | 9.43 |
99 Dike (dye'-kee, IPA: /ˈdaɪki/) 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.
References
| Minor planets (see full list) |
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| Previous minor planet | 99 Dike | Next minor planet |
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| Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Neptune Trojans · Comets · Trans-Neptunians (Kuiper belt • Scattered disc objects • Oort cloud) |
| For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons, meteoroids and the Solar System. For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names. |
