140 Siwa

Main-belt asteroid October 2019 yes #D6D6D6 140 Siwa 140 Siwa.png Lightcurve-based 3D model of 140 Siwa J. Palisa Austrian Naval Obs. 13 October 1874 (140) Siwa A874 TB; 1948 AL ˈ ʃ iː w əMarch 2020 Main belt 31 July 2016 (JD 2457600.5) 139.10 yr (50805 d) 0 2.73283 AU Gm on 2.14323 AU Gm on 3.3224 AU Gm on on 0.21575 4.52 yr (1650.1 d) 3.1860° 107.263° 196.711° 200.674° 17.80 km/s 109.79 3.0 km 1.418 kg 34.445 h d on on34.407 h C-type asteroid 8.34 0.0676 0.004 0.218166 ms / day Živa 140 Siwa is a large and dark main-belt asteroid that was discovered by Austrian astronomer Johann Palisa on October 13, 1874. It was named after Živa (Šiwa), a Slavic goddess of fertility. This object is orbiting the Sun at a distance of 2.73 AU with an eccentricity of 0.22 and an orbital period of 4.52 years. The orbital plane is inclined at an angle of 3.2°. A 2004 study of the spectrum of 140 Siwa matched a typical C-type asteroid with typical carbonaceous chondrite makeup. There are no absorption features of mafic minerals found. The classification was later revised to a P-type asteroid. Infrared measurement yields a diameter estimate of 110 km. Attempts to measure the rotation period of 140 Siwa have produced inconsistent results ranging from 14.7 to 32 hours. Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2010 gave an irregular light curve with a period of 34.407 ± 0.002 hours and a brightness variation of 0.05 ± 0.01 in magnitude. The Rosetta comet probe was to visit Siwa on its way to comet 46P/Wirtanen in July, 2008. However, the mission was rerouted to comet 67P/Churyumov-Gerasimenko and the flyby had to be abandoned. References Donald K. Yeomans 140 Siwa JPL Small-Body Database Browser NASA Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=140 https://web.archive.org/web/20160130063020/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=140 dead 30 January 2016 12 May 2016 . Greyzeck Ed Rosetta NSS Data Center NASA 2013 https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2004-006A 2013-03-30 . Pilcher Frederick Rotation Period Determinations for 25 Phocaea, 140 Siwa, 149 Medusa 186 Celuta, 475 Ocllo, 574 Reginhild, and 603 Timandra The Minor Planet Bulletin 38 2 76–78 April 2011 2011MPBu...38...76P . Birlan Mirel Barucci Maria Antonietta Vernazza Pierre Fulchignoni Marcello Binzel Richard P. Bus Schelte J. Belskaya Irina Fornasier Sonia 1 Near-IR spectroscopy of asteroids 21 Lutetia, 89 Julia, 140 Siwa, 2181 Fogelin and 5480 (1989YK8), potential targets for the Rosetta mission; remote observations campaign on IRTF New Astronomy 9 5 343–351 April 2004 10.1016/j.newast.2003.12.005 2004NewA....9..343B . astro-ph/0312638 https://hal.archives-ouvertes.fr/hal-00000987 Takir Driss Emery Joshua P. Outer Main Belt asteroids: Identification and distribution of four 3-μm spectral groups Icarus 219 2 641–654 June 2012 10.1016/j.icarus.2012.02.022 2012Icar..219..641T . External links 139 139 Juewa 140 141 Lumen 000140 Category:Discoveries by Johann Palisa Category:Named minor planets 000140 000140 18741013