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164 Eva information


164 Eva
3D convex shape model of 164 Eva
Discovery
Discovered byP. P. Henry
Discovery siteParis
Discovery date12 July 1876
Designations
MPC designation
(164) Eva
Pronunciation/ˈvə/[1]
Named after
Unknown
Alternative designations
A876 NA
Minor planet category
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)
Semi-major axis
2.6338 AU (394.01 Gm)
Eccentricity0.34577
Orbital period (sidereal)
4.27 yr (1561.2 d)
Mean anomaly
219.5472°
Mean motion
0° 13m 50.128s / day
Inclination24.4564°
Longitude of ascending node
76.8519°
Argument of perihelion
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)
Synodic rotation period
13.66 h (0.569 d)[2]
13.672 h[4]
Geometric albedo
0.0447±0.002
Temperature170 K (mean)
Spectral type
C
Absolute magnitude (H)
8.89,[2] 8.84[5]

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, though Karl Ludwig Littrow suspected a "worldly origin" ("Mit dem Namen könnten wir wie bei Miriam wieder den biblischen Boden zu betreten glauben, wenn wir bei diesem Entdecker nicht an Taufen weltlichen Ursprungs gewöhnt wären").[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.

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]

Between 2000 and 2021, 164 Eva has been observed to occult fourteen stars.

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]

  1. ^ "Eva". Dictionary.com Unabridged (Online). n.d.
  2. ^ a b c d Cite error: The named reference JPL was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Carry2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Warner2009 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Warner2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Schmadel2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Upton1877 was invoked but never defined (see the help page).
  8. ^ NASA.gov

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