139 Juewa

Main-belt asteroid October 2019 yes Lightcurve-based 3D model of 139 Juewa #D6D6D6 139 Juewa 139 Juewa.png James Craig Watson 10 October 1874 (139) Juewa lang dʒ u ˈ eɪ w ɑː joo AY wahMandarin: r ui 4 h ua 2 A874 TA Main belt 31 July 2016 (JD 2457600.5) 2.78073 AU Gm on 2.29261 AU Gm on 3.26884 AU Gm on on 0.17553 4.64 yr (1693.7 d) 10.9127° 1.83417° 165.566° 60.2817° 148.3 4.3 km × 142.3 15.6 km 151.116 1.596 km161.43 7.38 km 5.54 2.20 18 kg(3.262 ± 0.778/0.933)18 kg 2.51 1.05 g/cm31.805 ± 0.430/0.516 g/cm3 0.0438 m/s² 0.0828 km/s 20.991 h d on on CP (Tholen) 8.06, 7.924 0.052 0.0150.0444 0.0164 ~167 K 0.212552 ms / day 121.07 yr (44222 d) 0 瑞 華 星 瑞华星 "Auspicious star of Huaxia" / "Star of China's fortune" Ruìhuáxīng r ui 4 h ua 2 x ing 1 jui4 hua2 hsing1 139 Juewa (dʒ u ˈ eɪ w ɑː joo AY wah) is a very large and dark main belt asteroid. It is probably composed of primitive carbonaceous material. It was the first asteroid discovered from China. Juewa was discovered from Beijing by the visiting American astronomer James Craig Watson on 10 October 1874; Watson was in China to observe the transit of Venus. Watson asked Prince Gong to name the asteroid. Gong's choice was zh 瑞華星 (roughly, "Star of China's fortune"). Watson used the first two characters ('star' being redundant), transliterating them Juewa in Wade convention of the time. (In pinyin, zh 瑞華 is transliterated zh ruìhuá.)Schmadel Lutz D. Dictionary of Minor Planet Names https://books.google.com/books?id=KWrB1jPCa8AC&pg=PA28 2003 Springer Science & Business Media 978-3-540-00238-3 28 thumb|left|Multichord occultation by 139 Juewa, observed 31 August 2013 from N.S.W., Australia. Since 1988 there have been 8 reported stellar occultations by Juewa. From the occultation on 31 August 2013 the best fit ellipse measures 148.3 4.3 km × 142.3 15.6 km.https://sbn.psi.edu/pds/resource/occ.html Asteroid Occultations sbn.psi.edu en 2018-06-22 13-cm radar observations of this asteroid from the Arecibo Observatory between 1980 and 1985 were used to produce a diameter estimate of 172 km. Based upon radar data, the near surface solid density of the asteroid is 1.5 0.5 g/cm3. References Donald K. Yeomans 139 Juewa JPL Small-Body Database Browser NASA Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=139 12 May 2016 . 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. Pravec P. Harris A. W. Kusnirak P. Galad A. Hornoch K. 1 Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan 1667 May 2012 2012LPICo1667.6089P . See Table 4. Ostro S. J. Campbell D. B. Shapiro I. I. 1 Mainbelt asteroids - Dual-polarization radar observations Science 229 442–446 August 1985 10.1126/science.229.4712.442 1985Sci...229..442O . 17738665 4712 Magri C. Consolmagno G. J. Ostro S. J. Benner L. A. M. Beeney B. R. 1 Radar constraints on asteroid regolith compositions using 433 Eros as ground truth Meteoritics & Planetary Science 36 12 1697–1709 December 2001 10.1111/j.1945-5100.2001.tb01857.x 2001M&PS...36.1697M . Fienga A. Avdellidou C. Hanuš J. February 2020 Asteroid masses obtained with INPOP planetary ephemerides https://academic.oup.com/mnras/article/492/1/589/5658701 Monthly Notices of the Royal Astronomical Society 492 1 10.1093/mnras/stz3407 free subscription External links 139 138 Tolosa 139 140 Siwa 000139 Category:Discoveries by James Craig Watson Category:Named minor planets 000139 000139 000139 18741010