Astronomy:164 Eva
_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 | |
| Minor planet category | Main belt |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 118.93 yr (43438 d) |
| |{{{apsis}}}|helion}} | 3.5444 astronomical unit|AU (530.23 Gm) |
| |{{{apsis}}}|helion}} | 1.7188 AU (257.13 Gm) |
| 2.6338 AU (394.01 Gm) | |
| Eccentricity | 0.34577 |
| Orbital period | 4.27 yr (1561.2 d) |
| Mean anomaly | 219.5472° |
| Mean motion | 0° 13m 50.128s / day |
| Inclination | 24.4564° |
| Longitude of ascending node | 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] |
| 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) |
| Rotation period | 13.66 h (0.569 d)[2] 13.672 h[4] |
| Geometric albedo | 0.0447±0.002 |
| Physics | 170 K (mean) |
| 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.[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]
References
- ↑ "Eva". Dictionary.com Unabridged. Random House. https://www.dictionary.com/browse/Eva.
- ↑ 2.0 2.1 2.2 2.3 Yeomans, Donald K., "164 Eva", JPL Small-Body Database, https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=164, retrieved 12 May 2016.
- ↑ 3.0 3.1 3.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ 4.0 4.1 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.
- ↑ 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.
- ↑ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names, Springer, pp. 28, 1341, ISBN 978-3642297182, https://books.google.com/books?id=aeAg1X7afOoC&pg=PA1341.
- ↑ Upton, Winslow (July 1877), "Elements of (164) Eva", Astronomische Nachrichten 90 (6): 85–86, doi:10.1002/asna.18770900605, Bibcode: 1877AN.....90...85U, https://zenodo.org/record/1424701.
- ↑ NASA.gov
External links
- Lightcurve plot of 164 Eva, Palmer Divide Observatory, B. D. Warner (2008)
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 164 Eva at AstDyS-2, Asteroids—Dynamic Site
- 164 Eva at the JPL Small-Body Database
 |  |
