127 Johanna

Main-belt asteroid September 2018 yes #D6D6D6 127 Johanna 127Johanna (Lightcurve Inversion).png A three-dimensional model of 127 Johanna based on its lightcurve Paul Henry and Prosper Henry 5 November 1872 (127) Johanna A872 VB dʒ oʊ- ' h æ n əNoah Webster (1884) A Practical Dictionary of the English Language Joan of Arc Main belt 31 July 2016 (JD 2457600.5) 2.75615 AU Gm ri2 2 on 2.57138 AU Gm ri2 2 on 2.9409 AU Gm ri2 2 on on 0.067041 1671.3 days years 2 flip on 8.2449° 31.154° 94.611° 67.782° 17.92 km/s 122116.14 3.93 km (3.08 ± 1.35) × 1018 kg 3.75 1.68 g/cm3 12.7988 h d on on CX (Tholen)Ch (Bus) 8.6, 8.30 0.0557 0.0039 ~168 K 0.21540 ms / day 98.53 yr (35989 d) 0 1.60141 AU Gm ri2 2 on 2.11199 AU Gm ri2 2 on 3.325 127 Johanna is a large, dark main-belt asteroid that was discovered by French astronomers Paul Henry and Prosper Henry on 5 November 1872, and is believed to be named after Joan of Arc. It is classified as a CX-type asteroid, indicating the spectrum shows properties of both a carbonaceous C-type asteroid and a metallic X-type asteroid. A photoelectric study was performed of this minor planet in 1991 at the Konkoly Observatory in Hungary. The resulting light curve showed a synodic rotation period of 6.94 ± 0.29 hours with a brightness variation of 0.2 in magnitude. It was estimated to have an absolute magnitude of 8.459 ± 0.013 with a diameter of 96-118 km and an albedo of 0.06–0.04. Infrared observations made in 1982 at Konkoly showed a rapid variation that seemed to suggest a shorter rotation period of 1.5 hours; one of the fastest known at the time. However, an irregular shape was suggested as an alternative cause of the rapid variation. The present day established rotation period of this object is 12.7988 hours. During 2001, 127 Johanna was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 117 ± 21 km. A larger diameter value of 123.41 ± 4.07 km was obtained from the Midcourse Space Experiment observations, with an albedo of 0.0557 ± 0.0039. A 2012 study gave a refined diameter estimate of 116.14 ± 3.93 km. References Donald K. Yeomans 127 Johanna JPL Small-Body Database Browser NASA Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=127 12 May 2016 . Schmadel Lutz D. International Astronomical Union Dictionary of minor planet names 2003 Springer-Verlag Berlin; New York 978-3-540-00238-3 27 https://books.google.com/books?id=KWrB1jPCa8AC&pg=PA27 . B. Carry Density of asteroids Planetary and Space Science 73 98–118 December 2012 10.1016/j.pss.2012.03.009 2012P&SS...73...98C . 1203.4336 See Table 1. Toth Imre First lightcurve observations and rotation of minor planet 127 Johanna Planetary and Space Science 45 1625–1637 December 1997 10.1016/S0032-0633(97)00141-4 1997P&SS...45.1625T . Szecsenyi-Nagy G. 127 Johanna - Is it really the most quickly spinning asteroid known at this moment? Asteroids, comets, meteors; Proceedings of the Meeting, Uppsala, Sweden, June 20–22, 1983 45 49–53 1983 10.1016/S0032-0633(97)00141-4 1983acm..proc...49S . Magri Christopher Nolan Michael C. Ostro Steven J. Giorgini Jon D. 1 A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999–2003 Icarus 186 1 126–151 January 2007 10.1016/j.icarus.2006.08.018 2007Icar..186..126M Tedesco Edward F. Egan Michael P. Price Stephan D. 1 The Midcourse Space Experiment Infrared Minor Planet Survey The Astronomical Journal 124 124 583–591 July 2002 10.1086/340960 2002AJ....124..583T . free Behrend Raoul Courbes de rotation d'astéroïdes et de comètes Observatoire de Genève French http://obswww.unige.ch/~behrend/page_cou.html 2013-03-29 29 July 2016 https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html dead External links 127 126 Velleda 127 128 Nemesis 000127 Category:Discoveries by Paul Henry and Prosper Henry Category:Named minor planets 000127 000127 18721105