99 Dike

99 Dike

Discovery
Discovered by	Alphonse Borrelly
Discovery date	May 28, 1868
Designations
Named after	Dike
Alternative names	A915 BA; 1935 UC; 1935 YL; 1939 UT; 1948 UE; 1948 WC; 1961 XJ; 1974 VB
Minor planet category	Main belt
Orbital characteristics
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°
Physical characteristics
Dimensions	71.9 km
Mass	~3.9×10^17 kg
Mean density	2.0? g/cm³
Equatorial surface gravity	~0.0201 m/s²
Equatorial escape velocity	~0.0380 km/s
Rotation period	18.127[1][2] h
Geometric albedo	0.058 [3]
Temperature	~172 K
Spectral type	C (Tholen) Xk (Bus)[4]
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.

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.^[1]

The asteroid is located near the Juno clump of asteroids, but is most likely unrelated.

References

1. Pilcher, Frederick (October 2011), "Rotation Period Determinations for 11 Parthenope, 38 Leda, 111 Ate 194 Prokne, 217 Eudora, and 224 Oceana", The Minor Planet Bulletin 38 (4), pp. 183–185, Bibcode:2011MPBu...38..183P.
2. • JPL Small-Body Database Browser
3. Asteroid Data Sets
4. DeMeo, Francesca E.; et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 22 March 2013. See appendix A.

External links

• 99 Dike at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters