164 Eva

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.[6] The orbital elements for 164 Eva were published in 1877 by American astronomer Winslow Upton.[7] It is categorized as a C-type asteroid and is probably composed of primitive carbonaceous chondritic materials.

164 Eva
Discovery
Discovered byP. P. Henry
Discovery siteParis
Discovery date12 July 1876
Designations
(164) Eva
Pronunciation/ˈiːvə/[1]
Named after
Unknown
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc118.93 yr (43438 d)
Aphelion3.5444 AU (530.23 Gm)
Perihelion1.7188 AU (257.13 Gm)
2.6338 AU (394.01 Gm)
Eccentricity0.34577
4.27 yr (1561.2 d)
219.5472°
0° 13m 50.128s / day
Inclination24.4564°
76.8519°
283.9561°
Earth MOID0.882286 AU (131.9881 Gm)
Jupiter MOID2.44116 AU (365.192 Gm)
TJupiter3.191
Physical characteristics
Dimensions104.87±1.9 km[2]
101.77 ± 3.61 km[3]
Mass(9.29 ± 7.76) × 1017 kg[3]
Mean density
1.68 ± 1.41 g/cm3[3]
Equatorial surface gravity
2.249 cm/s (mean)
Equatorial escape velocity
4.857 cm/s (mean)
13.66 h (0.569 d)[2]
13.672 h[4]
0.0447±0.002
Temperature170 K (mean)
C
8.89,[2] 8.84[5]

    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.[4]

    In 2000 Eva was reported occulting a dim star.

    With a perihelion of 1.718 AU 164 Eva is the closest asteroid over 100 kilometers to approach the orbit of Mars. Its closest approach is about 0.05 AU or about 19.5 lunar distances.[8]

    References
    1. "Eva". Dictionary.com Unabridged. Random House.
    2. Yeomans, Donald K., "164 Eva", JPL Small-Body Database, retrieved 12 May 2016.
    3. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    4. Warner, Brian D. (January 2009), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September", The Minor Planet Bulletin, 36 (1): 7–13, Bibcode:2009MPBu...36....7W.
    5. Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin, 34 (4): 113–119, Bibcode:2007MPBu...34..113W.
    6. Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names, Springer, pp. 28, 1341, ISBN 978-3642297182.
    7. Upton, Winslow (July 1877), "Elements of (164) Eva", Astronomische Nachrichten, 90 (6): 85–86, Bibcode:1877AN.....90...85U, doi:10.1002/asna.18770900605.
    8. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=164


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