164 Eva
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet=yes
| background=#D6D6D6
| name=164 Eva
|image= 000164-asteroid shape model (164) Eva.png
|caption= 3D convex shape model of 164 Eva
| discovery_ref=
| discoverer=P. P. Henry
| discovery_site=Paris
| discovered=12 July 1876
| mpc_name=(164) Eva
| alt_names=A876 NA
| pronounced={{IPAc-en|'|iː|v|ə}}{{dict.com|Eva}}
| named_after=Unknown
| mp_category=Main belt
| epoch=31 July 2016 (JD 2457600.5)
| semimajor={{Convert|2.6338|AU|Gm|abbr=on}}
| perihelion={{Convert|1.7188|AU|Gm|abbr=on}}
| aphelion={{Convert|3.5444|AU|Gm|abbr=on|lk=on}}
| eccentricity=0.34577
| inclination=24.4564°
| asc_node=76.8519°
| arg_peri=283.9561°
| mean_anomaly=219.5472°
| avg_speed=
| dimensions={{val|104.87|1.9|ul=km}}
101.77 ± 3.61 km
| mass={{nowrap|(9.29 ± 7.76) × 1017 kg}}
| surface_grav=2.249 cm/s (mean)
| escape_velocity=4.857 cm/s (mean)
| rotation={{Convert|13.66|h|d|abbr=on|lk=on}}
13.672 h
| spectral_type=C
| magnitude=
| albedo={{val|0.0447|0.002}}
| single_temperature=170 K (mean)
| mean_motion={{Deg2DMS|0.230591|sup=ms}} / day
| observation_arc=118.93 yr (43438 d)
| uncertainty=0
| moid={{Convert|0.882286|AU|Gm|abbr=on}}
| jupiter_moid={{Convert|2.44116|AU|Gm|abbr=on}}
| tisserand=3.191
}}
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"). The orbital elements for 164 Eva were published in 1877 by American astronomer Winslow Upton. 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.
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.[https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=164 NASA.gov]
References
{{Reflist|refs=
| first1 = Donald K.
| last1 = Yeomans
| title = 164 Eva
| work = JPL Small-Body Database
| url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=164
| archive-url = https://web.archive.org/web/20190304133020/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=164
| url-status = dead
| archive-date = 4 March 2019
| accessdate= 12 May 2016
| postscript= .}}
| last1 = Upton
| first1 = Winslow
| title = Elements of (164) Eva
| journal = Astronomische Nachrichten
| volume = 90
| issue = 6
| pages = 85–86
|date=July 1877
| doi = 10.1002/asna.18770900605
| bibcode = 1877AN.....90...85U
| postscript= .| url = https://zenodo.org/record/1424701
}}
| first1 = B.
| last1 = Carry
| title = Density of asteroids
| journal = Planetary and Space Science
| volume = 73
| issue = 1
| pages = 98–118
|date=December 2012
| doi = 10.1016/j.pss.2012.03.009
| bibcode = 2012P&SS...73...98C
| postscript= .
|arxiv = 1203.4336}} See Table 1.
| last1 = Warner
| first1 = Brian D.
| title = Initial Results of a Dedicated H-G Project
| journal = The Minor Planet Bulletin
| volume = 34
| issue = 4
| pages = 113–119
|date=December 2007
| bibcode = 2007MPBu...34..113W
| postscript= .}}
| first1 = Lutz D.
| last1 = Schmadel
| title = Dictionary of Minor Planet Names
| publisher = Springer
| pages = 28, 1341
| year = 2012
| isbn = 978-3642297182
| url = https://books.google.com/books?id=aeAg1X7afOoC&pg=PA1341 | postscript= .}}
| last1 = Warner
| first1 = Brian D.
| title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September
| journal = The Minor Planet Bulletin
| volume = 36
| issue = 1
| pages = 7–13
|date=January 2009
| bibcode = 2009MPBu...36....7W
| postscript= .}}
}}
External links
- [http://www.minorplanetobserver.com/pdolc/A164_2008.HTM Lightcurve plot of 164 Eva], Palmer Divide Observatory, B. D. Warner (2008)
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|164}}
- {{JPL small body}}
{{Minor planets navigator |163 Erigone |number=164 |165 Loreley}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:000164}}
Category:CX-type asteroids (Tholen)
Category:X-type asteroids (SMASS)
Category:Objects observed by stellar occultation
{{C-beltasteroid-stub}}