145534 Jhongda

Main-belt asteroid December 2018 yes 145534 Jhongda #D6D6D6 1 April 2006 T.-C. YangQ.-Z. Ye Lulin Obs. (145534) Jhongda 2006 GJ National Central University(Taiwanese University) main-belt(middle)Merxia 27 April 2019 (JD 2458600.5) 0 25.91 yr (9,464 d) 3.0903 AU 2.3208 AU 2.7055 AU 0.1422 4.45 yr (1,625 d) 262.51° 0.2215 ms / day 6.2031° 105.82° 189.48° 2.1 km (est. at 0.23)3.54 km (calculated) 4.49 0.040 h 0.057 (assumed)0.23 (family albedo) C (assumed)S (family based) 15.6 145534 Jhongda, provisional designation 2006 GJ, is an asteroid and member of the stony Merxia family, orbiting in the central region of the asteroid belt, approximately 2–3 km mi off 1 us in diameter. It was discovered by Taiwanese astronomers Yang Tingzhang and Ye Quanzhi at the Lulin Observatory on 1 April 2006. The likely elongated asteroid has a rotation period of 4.5 hours. It was named for the Taiwanese National Central University. Orbit and classification Jhongda is a member of the Merxia family (513), a large family of stony S-type asteroids named after its parent body 808 Merxia.23 It orbits the Sun in the central main-belt at a distance of 2.3–3.1 AU once every 4 years and 5 months (1,625 days; semi-major axis of 2.71 AU). Its orbit has an eccentricity of 0.14 and an inclination of 6° with respect to the ecliptic. The first precovery was taken by Spacewatch in February 1992, extending the asteroid's observation arc by 14 years prior to its discovery at the Lulin Observatory. Naming This minor planet was named after the Taiwanese National Central University, which controls the discovering Lulin Observatory. "Jhongda" is the University's abbreviation in Mandarin Chinese. The official 145534 naming citation was published by the Minor Planet Center on 2 April 2007 (M.P.C. 59389). Physical characteristics In January 2014, a rotational lightcurve of Jhongda was obtained from photometric observation by astronomers at the Intermediate Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 4.490 0.040 hours with a high brightness variation of 0.67 in magnitude (U=2) indicative of an elongated, non-spherical shape. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 3.54 kilometers with an absolute magnitude of 15.98. Conversely, Jhongda measure only 2.1 kilometers for an albedo of 0.23, which is typical for the stony members of the Merxia family.23 References 2018-01-23 last obs. JPL Small-Body Database Browser: 145534 Jhongda (2006 GJ) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2145534 Jet Propulsion Laboratory 4 December 2018 145534 Jhongda (2006 GJ) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=145534 4 December 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 4 December 2018 Asteroid (145534) Jhongda AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=145534&pc=1.1.6 4 December 2018 Asteroid 145534 Jhongda Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=145534+Jhongda 4 December 2018 https://web.archive.org/web/20181205003233/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=145534+Jhongda 5 December 2018 dead D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 119280014 Asteroid Size Estimator CNEOS NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 4 December 2018 145534 4 December 2018 6 Chan-Kao Chang Wing-Huen Ip Ip Wing-huen Hsing-Wen Lin Yu-Chi Cheng Chow-Choong Ngeow Ting-Chang Yang Adam Waszczak Shrinivas R. Kulkarni David Levitan Branimir Sesar Russ Laher Jason Surace Thomas. A. Prince August 2015 Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory The Astrophysical Journal Supplement Series 219 2 19 2015ApJS..219...27C 10.1088/0067-0049/219/2/27 1506.08493 17093124 External links 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 Discovery Circumstances: Numbered Minor Planets (145001)-(150000) – Minor Planet Center 145534 145534 145534 Category:Discoveries by Yang Tingzhang Category:Discoveries by Quanzhi Ye Category:Named minor planets 20060401