|Discovery and designation|
|Discovered by||Alphonse Borrelly|
|Discovery date||May 28, 1868|
|Alternative names||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)|
|Orbital period||1587.810 d (4.35 a)|
|Average orbital speed||18.07 km/s|
|Longitude of ascending node||41.678°|
|Argument of perihelion||196.045°|
|Mean density||2.0? g/cm³|
|Equatorial surface gravity||~0.0201 m/s²|
|Equatorial escape velocity||~0.0380 km/s|
|Rotation period||18.127 h|
|Geometric albedo||0.058 |
|Spectral type||C (Tholen)
|Absolute magnitude (H)||9.43|
99 Dike (// 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.
Based upon a light curve that was generated from photometric observations of this asteroid at Pulkovo Observatory, it has a rotation period of 18.127 ± 0.002 hours and varies in brightness by 0.22 ± 0.02 in magnitude.
- Pilcher, Frederick (October 2011), "Rotation Period Determinations for 11 Parthenope, 38 Leda, 111 Ate 194 Prokne, 217 Eudora, and 224 Oceana", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 38 (4): 183–185, Bibcode:2011MPBu...38..183P.
- *JPL Small-Body Database Browser
- Asteroid Data Sets
- DeMeo, Francesca E. et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared", Icarus 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 2013-03-33. See appendix A.
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