(119979) 2002 WC19

Trans-Neptunian object yes #C2E0FF (119979) 2002 WC 19 2002 WC19.jpg 2002 WC 19 and its satellite imaged by the Hubble Space Telescope in 2006 Palomar Observatory 16 November 2002 (119979) 2002 WC 19 twotinobinary 13 January 2016 (JD 2457400.5) 48.010 AU Tm on 35.289 AU Tm on ≈ 5 November 2056JPL Horizons Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is 3-sigma.)±3 days 60.732 AU Tm on on 0.26498 332.67 yr (121,507 d) 9.1746° 109.7547° 44.356° 316.02° 1 (81 km) 338 44 km 8.13 1.0 19 kg (prograde) or 7.263 0.87 19 kg (retrograde) 1.97 1.00 g/cm3 for the average of prograde and retrograde masses(2.08 1.06 g/cm3 if prograde,1.86 0.94 g/cm3 if retrograde) 0.05 4.66 0.0029628 ms / day 3978 days (10.89 yr) 3 34.3056 AU Tm on 29.9229 AU Tm on (119979) 2002 WC 19 is a twotino, that is, a trans-Neptunian object in a 1:2 orbital resonance with Neptune. It was discovered on November 16, 2002, at the Palomar Observatory. Its estimated diameter predicts a density comparable to that of Pluto, which would be unusual as it is much smaller than the expected size at which a Kuiper belt object would normally becomes solid. However, the error bar for the density is 50%, consistent with the density of water ice to within one sigma. Knowing how many twotinos there are may reveal whether Neptune took roughly 1 million or 10 million years to migrate about 7 AU from its birth location. Satellite Satellite K. S. Noll, W. M. Grundy, S. D. Kern, H. F. Levison, D. C. Stephens Hubble Space Telescope 5 November 2006 4092 94 km 0.21 0.05 8.403 0.001 d 24.0 0.7 ° (119979) 2002 WC 19 81 km (assuming similar albedo) primary + 2.5 On February 27, 2007, a natural satellite was reported to be orbiting 2002 WC 19. It is estimated to be 4092 94 km from the primary, with an orbital period of 8.403 0.001 days, an eccentricity of 0.21 0.05 and an inclination of 24.0 0.7 °. Assuming similar albedos, it is a quarter the diameter of its primary, or around 81 km mi in diameter. left References Marc W. Buie Marc W. Buie 2004-12-14 Orbit Fit and Astrometric record for 119979 (using 61 of 65 observations) SwRI (Space Science Department) http://www.boulder.swri.edu/~buie/kbo/astrom/119979.html 2009-03-04 MPEC 2009-C70 :Distant Minor Planets (2009 February 28.0 TT) 2009-02-10 Minor Planet Center http://www.cfa.harvard.edu/mpec/K09/K09C70.html 2009-03-04 2012-11-06 last obs; arc: 10.89 years JPL Small-Body Database Browser: 119979 (2002 WC19) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=119979 7 April 2016 27 May 2019 (119979) 2002 WC19 Johnston's Archive Wm. Robert Johnston http://www.johnstonsarchive.net/astro/astmoons/am-119979.html 2020-10-16 2009-01-04 On the Fringe ScienceNews Ron Cowen http://www.sciencenews.org/view/feature/id/52225/title/On_the_Fringe 2010-01-04 https://web.archive.org/web/20100107053508/http://www.sciencenews.org/view/feature/id/52225/title/On_the_Fringe 7 January 2010 Grundy W.M. Noll K.S. Roe H.G. Buie M.W. Porter S.B. Parker A.H. Nesvorný D. Levison H.F. Benecchi S.D. Stephens D.C. Trujillo C.A. Mutual orbit orientations of transneptunian binaries Icarus December 2019 334 62–78 10.1016/j.icarus.2019.03.035 External links 119979 119979 (119979) 2002 WC 19 Category:Twotinos Category:Discoveries by the Palomar Observatory Category:Binary trans-Neptunian objects 20021116