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[1] | |
| 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° |
| Proper orbital elements[1] | |
| Proper mean motion | 0.2306 deg / yr |
| Proper orbital period |
1561.14484 yr (570208.153 d) |
| Physical characteristics | |
| Dimensions | 101.77 ± 3.61[2] km |
| Mass | (9.29 ± 7.76) × 1017[2] kg |
| Mean density | 1.68 ± 1.41[2] g/cm3 |
| Equatorial surface gravity | 2.249 cm/s (mean) |
| Escape velocity | 4.857 cm/s (mean) |
| Rotation period | 13.672[3] h |
| Albedo | 0.0447 |
| Temperature | 170 K (mean) |
| Spectral type | C |
| Absolute magnitude (H) | 8.84[4] |
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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
- ↑ 1.0 1.1 Yeomans, Donald K., "164 Eva", JPL Small-Body Database, retrieved 2013-03-25.
- ↑ 2.0 2.1 2.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98-118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ 3.0 3.1 Warner, Brian D. (January 2009), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 36 (1): 7–13, Bibcode:2009MPBu...36....7W.
- ↑ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 34: 113–119, Bibcode:2007MPBu...34..113W.
- ↑ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names, Springer, p. 28, 1341, ISBN 3642297188.
- ↑ Upton, Winslow (July 1877), "Elements of (164) Eva", Astronomische Nachrichten 90: 85, Bibcode:1877AN.....90...85U, doi:10.1002/asna.18770900605.
External links
- 164 Eva at the JPL Small-Body Database
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