164 Eva

From Wikipedia, the free encyclopedia
Jump to: navigation, search
164 Eva
Discovery
Discovered by P. P. Henry
Discovery site Paris
Discovery date 12 July 1876
Designations
MPC designation 164
Named after
Unknown
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 118.93 yr (43438 d)
Aphelion 3.5444 AU (530.23 Gm)
Perihelion 1.7231 AU (257.77 Gm)
2.6338 AU (394.01 Gm)
Eccentricity 0.34577
4.27 yr (1561.2 d)
219.5472°
0° 13m 50.128s / day
Inclination 24.4564°
76.8519°
283.9561°
Earth MOID 0.882286 AU (131.9881 Gm)
Jupiter MOID 2.44116 AU (365.192 Gm)
Jupiter Tisserand parameter 3.191
Physical characteristics
Dimensions 104.87±1.9 km[1]
101.77 ± 3.61 km[2]
Mass (9.29 ± 7.76) × 1017 kg[2]
Mean density
1.68 ± 1.41 g/cm3[2]
Equatorial surface gravity
2.249 cm/s (mean)
Equatorial escape velocity
4.857 cm/s (mean)
13.66 h (0.569 d)[1]
13.672 h[3]
0.0447±0.002
Temperature 170 K (mean)
C
8.89,[1] 8.84[4]

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.[5] The orbital elements for 164 Eva were published in 1877 by American astronomer Winslow Upton.[6] 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.[3]

In 2000 Eva was reported occulting a dim star.

References[edit]

  1. ^ a b c d Yeomans, Donald K., "164 Eva", JPL Small-Body Database, retrieved 12 May 2016. 
  2. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336free to read, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  3. ^ a b Warner, Brian D. (January 2009), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September", The Minor Planet Bulletin, 36 (1), pp. 7–13, Bibcode:2009MPBu...36....7W. 
  4. ^ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin, 34, pp. 113–119, Bibcode:2007MPBu...34..113W. 
  5. ^ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names, Springer, pp. 28, 1341, ISBN 3642297188. 
  6. ^ Upton, Winslow (July 1877), "Elements of (164) Eva", Astronomische Nachrichten, 90, p. 85, Bibcode:1877AN.....90...85U, doi:10.1002/asna.18770900605. 

External links[edit]