1803 Zwicky

Main-belt asteroid binary October 2019 yes 1803 Zwicky #D6D6D6 P. Wild Zimmerwald Obs. 6 February 1967 (1803) Zwicky 1967 CA1931 DL Fritz Zwicky(Swiss astronomer) main-belt(inner)Phocaea 17 December 2020 (JD 2459200.5) 0 90.09 yr (32,907 d) 2.9312 AU 1.7685 AU 2.3498 AU 0.2474 3.60 yr (1,316 d) 284.97° 0.2736 ms / day 21.553° 337.24° 253.96° 1 (0.26Ds/Dp; P: 28.5 h) 9.20 0.24 km 9.934 0.080 km (Prim.: 9.61 0.08 km) (Sec.: 2.50 0.19 km) 2.73364 0.00005 h 0.259 0.038 0.337 S 12.2312.24 1803 Zwicky, prov. designation: 1967 CA, is a stony Phocaea asteroid and binary system from the inner regions of the asteroid belt, approximately 10 km mi off 2 us in diameter. It was discovered on 6 February 1967, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland. It was later named after Swiss astronomer Fritz Zwicky. The discovery of a 2.5-kilometer sized companion was announced on 8 March 2021. Classification and orbit Zwicky is a member of the Phocaea family (701), an asteroid family with two thousand members, named after their largest member, 25 Phocaea. It orbits the Sun in the inner main-belt at a distance of 1.8–2.9 AU once every 3 years and 7 months (1,316 days; semi-major axis of 2.35 AU). Its orbit has an eccentricity of 0.25 and an inclination of 22° with respect to the ecliptic. It was first identified as 1931 DL at Lowell Observatory in 1931, extending the body's observation arc by 36 years prior to its official discovery observation. Naming This minor planet was named after Swiss astronomer Fritz Zwicky (1898–1974), who was a professor at Caltech and a pioneer in many fields, most notably in the study of galaxy clusters and supernovas, in high-energy astrophysics, and in developing jet propulsion for spacecraft and airplanes. He was the first to infer the existence of unseen matter and coined the term dark matter. The lunar crater Zwicky is also named in his honour. The official 1803 naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4156). Physical characteristics Zwicky is a bright, stony S-type asteroid, in line with the overall spectral type for members of the Phocaea family. Lightcurves In July 2018, a rotational lightcurve of Zwicky was obtained from photometric observations by the TESS-team which gave a rotation period of (2.73364 0.00005) hours and an amplitude of (0.06 0.01) magnitude (U=2). Observations by Tom Polakis, who also discovered a satellite, determined a very similar period of (2.7329 0.0002) hours with a brightness variation of (0.105 0.035) (U=2). These more recent result are replacing a previous observation from March 2003, of a fragmentary lightcurve by French amateur astronomer Laurent Bernasconi that gave a tentative period of 27.1 hours and an amplitude of 0.08 (U=1). Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Zwicky measures between 9.20 0.24 and 9.934 0.080 kilometers in diameter, and its surface has an albedo of 0.337 and 0.259 0.038, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for Phocaea asteroids of 0.23, and calculates a diameter of 10.06 kilometers based on an absolute magnitude of 12.2. The WISE team also published an alternative mean-diameters of (8.03 1.37) and (10.229 0.082) kilometers with a corresponding albedo of (0.35) and (0.2466). Satellite Photometric observations at the Command Module Observatory V02 by Tom Polakis on 21 February 2021 revealed that Zwicky has a satellite in its orbit. The moon has a diameter of approximately 2.50 kilometers, or 26% of that of its primary, and an orbital period of 28.46 hours. References 30em 2021-03-23 last obs. JPL Small-Body Database Browser: 1803 Zwicky (1967 CA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001803 Jet Propulsion Laboratory 27 June 2021 Dictionary of Minor Planet Names Schmadel Lutz D. Springer Berlin Heidelberg (1803) Zwicky 144 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1804 1803 Zwicky (1967 CA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1803 27 June 2021 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) Appendix – Publication Dates of the MPCs Schmadel Lutz D. 2009 Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 2009dmpn.book.....S Asteroids and comets rotation curves – (1803) Zwicky Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001803 16 December 2016 1 April 2019 https://web.archive.org/web/20190401181659/http://obswww.unige.ch/~behrend/page4cou.html#001803 dead Asteroid 1803 Zwicky – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1803+Zwicky#Asteroid%201803%20ZwickyEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 October 2026 InternetArchiveBot 1803 27 June 2021 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 27 June 2021 (online, AcuA catalog p. 153) 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results http://iopscience.iop.org/0004-637X/741/2/68/fulltext/apj398969t1_mrt.txt The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 35447010 27 June 2021 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 119293330 6 C. R. Nugent A. Mainzer J. Masiero J. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett R. Stevenson E. L. Wright December 2015 NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 6 A. K. Mainzer J. M. Bauer R. M. Cutri T. Grav E. A. Kramer J. R. Masiero C. R. Nugent S. M. Sonnett R. A. Stevenson E. L. Wright June 2016 NEOWISE Diameters and Albedos V1.0 https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab NASA Planetary Data System 2016PDSS..247.....M 27 June 2021 Asteroids with Satellites Database – (1803) Zwicky Johnston's Archive 14 March 2021 Johnston Wm. Robert https://www.johnstonsarchive.net/astro/astmoons/am-01803.html 26 June 2021 6 Pál András Szakáts Róbert Kiss Csaba Bódi Attila Bognár Zsófia Kalup Csilla Kiss László L. Marton Gábor Molnár László Plachy Emese Sárneczky Krisztián Szabó Gyula M. Szabó Róbert March 2020 Solar System Objects Observed with TESS—First Data Release: Bright Main-belt and Trojan Asteroids from the Southern Survey The Astrophysical Journal Supplement Series 247 1 26 2020ApJS..247...26P 0067-0049 10.3847/1538-4365/ab64f0 2001.05822 210718903 free 6 Popescu M. Licandro J. Carvano J. M. Stoicescu R. de León J. Morate D. Boacă I. L. Cristescu C. P. September 2018 Taxonomic classification of asteroids based on MOVIS near-infrared colors Astronomy and Astrophysics 617 A12 2018A&A...617A..12P 0004-6361 10.1051/0004-6361/201833023 1807.00713 119030733 (VizieR online cat) External links Minor Planet 1803 Zwicky -- Discovery of Binary Companion, Tom Polakis on YouTube Lightcurve Database (LCDB), query form (info) 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 – Geneva Observatory, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1803 1802 Zhang Heng 1803 1804 Chebotarev 001803 Category:Discoveries by Paul Wild (Swiss astronomer) Category:Named minor planets 001803 19670206