164 Eva

164 Eva

Discovery
Discovered by	P. P. Henry
Discovery site	Paris
Discovery date	July 12, 1876
Designations
MPC designation	164
Minor planet category	Main belt
Orbital characteristics
Epoch November 4, 2013
Aphelion	3.5412 AU (529.76 Gm)
Perihelion	1.7262 AU (258.24 Gm)
Semi-major axis	2.6337 AU (394.00 Gm)
Eccentricity	0.3446
Orbital period	1561.1769 d 4.27 a
Mean anomaly	349.3173°
Inclination	24.4700°
Longitude of ascending node	77.1008°
Argument of perihelion	283.5634°
Physical characteristics
Dimensions	101.77 ± 3.61 km
Mass	(9.29 ± 7.76) × 1017 kg
Mean density	1.68 ± 1.41 g/cm3
Surface gravity	2.249 cm/s (mean)
Escape velocity	4.857 cm/s (mean)
Rotation period	13.672 h
Albedo	0.0447
Temperature	170 K (mean)
Spectral type	C
Absolute magnitude (H)	8.84

164 Eva is a main-belt asteroid that was discovered by the French brothers Paul Henry and Prosper Henry on July 12, 1876, in Paris. The reason the name Eva was chosen remains unknown. The orbital elements for 164 Eva were published in 1877 by American astronomer Winslow Upton. It is categorized as a C-type asteroid and is probably composed of primitive carbonaceous chondritic materials.

Photometric observations of this asteroid at the Palmer Divide Observatory in Colorado Springs, Colorado, during 2008 gave a light curve with a period of 13.672 ± 0.003 hours and a small brightness variation of 0.04 ± 0.01 in magnitude. This is consistent with a previous study reported in 1982 that listed a period estimate of 13.66 hours.

In 2000 Eva was reported occulting a dim star.

External links

• 164 Eva at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters