1131 Porzia

Asteroid within the Asteroid Belt October 2019 yes 1131 Porzia #FA8072 10 September 1929 K. Reinmuth Heidelberg Obs. (1131) Porzia 1929 RO1939 TJ1962 MB de ˈpɔʁtsi̯aː lang Porcia Catonis(in Shakespeare's play)Julius Caesar Mars-crosser 4 September 2017 (JD 2458000.5) 0 87.55 yr (31,978 days) 2.8667 AU 1.5893 AU 2.2280 AU 0.2867 3.33 yr (1,215 days) 165.22° 0.2964 ms / day 3.2292° 100.71° 248.01° 6.53 0.65 km7.13 km (calculated) 4.0 0.2 h (dated)4.6584 0.0005 h4.6601 0.0006 h 0.20 (assumed)0.287 0.057 SMASS = SS 11.94 0.7012.0012.9013.013.10 0.14 1131 Porzia, provisional designation 1929 RO, is a stony asteroid and sizable Mars-crosser from the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 10 September 1929, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The asteroid was named after Porcia wife of Brutus, who assassinated Julius Caesar. Orbit and classification Porzia is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.666 AU. It orbits the Sun at a distance of 1.6–2.9 AU once every 3 years and 4 months (1,215 days). Its orbit has an eccentricity of 0.29 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins at Heidelberg, 19 days after its official discovery observation. Physical characteristics In the SMASS taxonomy, Porzia is a common stony S-type asteroid. Lightcurves Two rotational lightcurves of Porzia were obtained by Vladimir Benishek at Belgrade Observatory shortly before its opposition in November 2009, and by French amateur astronomer René Roy in December 2012. Lightcurve analysis gave a well defined rotation period of 4.6584 and 4.6601 hours with a brightness variation of 0.15 and 0.19 magnitude, respectively (U=3/3). The results supersede photometric observations taken by Polish astronomer Wiesław Wiśniewski in January 1990, which rendered a lightcurve with a period 4.0 0.2 hours and an amplitude of 0.23 magnitude (U=2). Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, Porzia measures 6.53 kilometers in diameter and its surface has an albedo of 0.287, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.13 kilometers with an absolute magnitude of 13.10. This makes Porzia one of the larger mid-sized Mars-crossing asteroids comparable with 1065 Amundsenia (9.75 km), 1139 Atami (9.35 km), 1474 Beira (8.73 km), 1011 Laodamia (7.5 km), 1727 Mette (est. 9 km), 1235 Schorria (est. 9 km), 985 Rosina (8.18 km), 1310 Villigera (15.24 km) and 1468 Zomba (7 km), but far smaller than the largest members of this dynamical group, namely, 132 Aethra, 323 Brucia, 1508 Kemi, 2204 Lyyli and 512 Taurinensis, which are all larger than 20 kilometers in diameter. Naming This minor planet was named after the wife of Brutus, Porcia Catonis, who kills herself at news of her husband's death in Shakespeare's play Julius Caesar. The official naming citation was also published by Paul Herget in The Names of the Minor Planets in 1955 (H 106). References 30em 2017-03-30 last obs. JPL Small-Body Database Browser: 1131 Porzia (1929 RO) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001131 Jet Propulsion Laboratory 26 July 2017 Dictionary of Minor Planet Names – (1131) Porzia Schmadel Lutz D. Springer Berlin Heidelberg 96 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1132 (1131) Porzia 1131 Porzia (1929 RO) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1131 8 February 2017 Asteroids and comets rotation curves – (1131) Porzia Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page3cou.html#001131 8 February 2017 3 December 2002 https://web.archive.org/web/20021203214643/http://obswww.unige.ch/~behrend/page3cou.html#001131 dead 1131 8 February 2017 W. Z. Wisniewski T. M. Michalowski A. W. Harris R. S. McMillan March 1995 Photoelectric Observations of 125 Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995LPI....26.1511W Abstracts of the Lunar and Planetary Science Conference 26 1511 1995LPI....26.1511W 8 February 2017 Vladimir Benishek Vojislava Protitch-Benishek April 2010 Period Determination for 1131 Porzia and 1819 Laputa http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...64B The Minor Planet Bulletin 37 2 64–65 1052-8091 2010MPBu...37...64B 8 February 2017 Petr Pravec Alan W. Harris Peter Kusnirák Adrián Galád Kamil Hornoch September 2012 Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P Icarus 221 1 365–387 2012Icar..221..365P 10.1016/j.icarus.2012.07.026 8 February 2017 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 8 February 2017 B. Carry E. Solano S. Eggl F. E. DeMeo April 2016 Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016Icar..268..340C Icarus 268 340–354 2016Icar..268..340C 10.1016/j.icarus.2015.12.047 1601.02087 8 February 2017 V. Alí-Lagoa M. Delbo' July 2017 Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data https://www.aanda.org/articles/aa/pdf/2017/07/aa29917-16.pdf Astronomy and Astrophysics 603 8 2017A&A...603A..55A 10.1051/0004-6361/201629917 1705.10263 20 October 2017 External links Photometry of Asteroids at The Belgrade Astronomical Observatory, Vladimir Benishek's Page 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/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1131 1130 Skuld 1131 1132 Hollandia 001131 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 001131 19290910