_Eva.png) 3D convex shape model of 164 Eva | |
| Discovery | |
|---|---|
| Discovered by | P. P. Henry |
| Discovery site | Paris |
| Discovery date | 12 July 1876 |
| Designations | |
| (164) Eva | |
| Pronunciation | /ˈiːvə/[1] |
Named after | Unknown |
| A876 NA | |
| Main belt | |
| Orbital characteristics[2] | |
| 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 | 1.7188 AU (257.13 Gm) |
| 2.6338 AU (394.01 Gm) | |
| Eccentricity | 0.34577 |
| 4.27yr (1561.2d) | |
| 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) |
| TJupiter | 3.191 |
| Physical characteristics | |
| Dimensions | 104.87±1.9 km[2] 101.77 ± 3.61 km[3] |
| Mass | (9.29 ± 7.76) × 1017 kg[3] |
Meandensity | 1.68 ± 1.41 g/cm3[3] |
Equatorialsurface gravity | 2.249 cm/s (mean) |
Equatorialescape velocity | 4.857 cm/s (mean) |
| 13.66 h (0.569 d)[2] 13.672 h[4] | |
| 0.0447±0.002 | |
| Temperature | 170 K (mean) |
| C | |
| 8.89,[2] 8.84[5] | |
164 Eva is amain-beltasteroid that was discovered by the French brothersPaul Henry and Prosper Henry on July 12, 1876, in Paris. The reason the name Eva was chosen remains unknown, thoughKarl Ludwig Littrow suspected a "worldly origin" ("Mit dem Namen könnten wir wie beiMiriam wieder den biblischen Boden zu betreten glauben, wenn wir bei diesem Entdecker nicht an Taufen weltlichen Ursprungs gewöhnt wären").[6] Theorbital elements for 164 Eva were published in 1877 by American astronomerWinslow Upton.[7] It is categorized as aC-type asteroid and is probably composed of primitivecarbonaceouschondritic materials.
Photometric observations of this asteroid at the Palmer Divide Observatory inColorado Springs, Colorado, during 2008 gave alight curve with a period of 13.672 ± 0.003 hours and a small brightness variation of 0.04 ± 0.01 inmagnitude. 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 tooccult fourteen stars.
With a perihelion of 1.718 AU 164 Eva is the closest asteroid over 100 kilometers to approach theorbit of Mars. Its closest approach is about 0.05 AU or about 19.5 lunar distances.[8]
_mathilde.jpg) | This article about a C-type asteroid native to theasteroid belt is astub. You can help Wikipedia byadding missing information. |
