164 Eva

Main-belt asteroid October 2019 yes #D6D6D6 164 Eva 000164-asteroid shape model (164) Eva.png 3D convex shape model of 164 Eva P. P. Henry Paris 12 July 1876 (164) Eva A876 NA ' iː v əEva Unknown Main belt 31 July 2016 (JD 2457600.5) 2.6338 AU Gm on 1.7188 AU Gm on 3.5444 AU Gm on on 0.34577 4.27 yr (1561.2 d) 24.4564° 76.8519° 283.9561° 219.5472° 0.230591 ms / day 118.93 yr (43438 d) 0 0.882286 AU Gm on 2.44116 AU Gm on 3.191 101.77 ± 3.61 km (composite estimate)104.87 1.9 km 1.15 0.49 18 kgCalculated from its standard gravitational parameter GM = 0.077 0.033 km3/s2. 2.19 g/cm3Assuming a diameter of 100 km. 2.249 cm/s (mean) 4.857 cm/s (mean) 13.66 h d on on13.672 h C 8.89, 8.84 0.0447 0.002 170 K (mean) 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. This asteroid is categorized as a C-type asteroid and is probably composed of primitive carbonaceous chondritic materials. Dust activity due to sublimation has been detected on this asteroid, suggesting the presence of water ice in its interior. This object has an estimated diameter of around 105 km. 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.March 2026 164 Eva is orbiting the Sun at a distance of 2.63 km with an eccentricity of 0.35 and an orbital period of 4.27 years. The orbital plane is inclined at an angle of 24.5° to the plane of the ecliptic. With a perihelion of 1.718 AU 164 Eva is the closest asteroid with a diameter over 100 kilometers to approach the orbit of Mars. Its closest approach is about 0.05 AU or about 19.5 lunar distances.NASA.gov Notes References Donald K. Yeomans 164 Eva JPL Small-Body Database https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=164 https://web.archive.org/web/20190304133020/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=164 dead 4 March 2019 12 May 2016 . Upton Winslow Elements of (164) Eva Astronomische Nachrichten 90 6 85–86 July 1877 10.1002/asna.18770900605 1877AN.....90...85U . https://zenodo.org/record/1424701 B. Carry Density of asteroids Planetary and Space Science 73 1 98–118 December 2012 10.1016/j.pss.2012.03.009 2012P&SS...73...98C . 1203.4336 See Table 1. Warner Brian D. Initial Results of a Dedicated H-G Project The Minor Planet Bulletin 34 4 113–119 December 2007 2007MPBu...34..113W . Lutz D. Schmadel Dictionary of Minor Planet Names Springer 28, 1341 2012 978-3642297182 https://books.google.com/books?id=aeAg1X7afOoC&pg=PA1341 . Warner Brian D. Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September The Minor Planet Bulletin 36 1 7–13 January 2009 2009MPBu...36....7W . Sublimation-Driven Dust Activity of Primitive-Type Asteroids as a Sign of the Presence of H2O Ice Busarev V. V. Petrova E. V. Shcherbina M. P. Burlak M. A. Ikonnikova N. P. Maksimova M. V. 1 Solar System Research 58 6 715–731 December 2024 10.1134/S0038094624700503 2024SoSyR..58..715B Fuentes-Muñoz Oscar Farnocchia Davide Giorgini Jon D. Park Ryan S. 2025-12-01 Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release The Astronomical Journal 170 6 353 10.3847/1538-3881/ae0cc9 0004-6256 free 2025AJ....170..353F 283347135 External links Lightcurve plot of 164 Eva, Palmer Divide Observatory, B. D. Warner (2008) Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 164 163 Erigone 164 165 Loreley Category:Background asteroids Eva Eva Category:CX-type asteroids (Tholen) Category:X-type asteroids (SMASS) 18760712 Category:Objects observed by stellar occultation