IAUC 8747: (134340); 178P; P/2006 R1; 2006ev

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                                                  Circular No. 8747Central Bureau for Astronomical TelegramsINTERNATIONAL ASTRONOMICAL UNIONMailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)CBAT@CFA.HARVARD.EDU (science)URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304Phone 617-495-7440/7244/7444 (for emergency use only)(134340) PLUTO, (136199) ERIS, AND (136199) ERIS I (DYSNOMIA)     Following the Aug. 24 resolution by the IAU to the effect thatthe solar system contains eight "planets" (Mercury-Neptune), with(1) Ceres, Pluto (cf.IAUC 255), and 2003 UB_313 (cf.IAUC 8577) tobe considered representative "dwarf planets", the Minor PlanetCenter included Pluto and 2003 UB_313 (along with two other newpotential dwarf-planet candidates) in the standard catalogue ofnumbered objects with well-determined orbits as (134340) and(136199), respectively (see MPC 57525).  Following near-unanimousacceptance by both the Committee on Small-Body Nomenclature and theWorking Group on Planetary-System Nomenclature (in consultationwith the discovery team), the IAU Executive Committee has nowapproved the names Eris for (136199) and Dysnomia for its satellite(136199) Eris I [formerly S/2005 (2003 UB_313) 1; cf.IAUC 8610].COMET 178P/HUG-BELL     Comet P/1999 X1 = 2006 O1 (cf.IAUC 8730) has been given thepermanent number 178P (cf. MPC 57382).COMET P/2006 R1 (SIDING SPRING)     Additional astrometry and the following improved orbitalelements for this comet (cf.IAUC 8744) appear onMPEC 2006-R47.The orbital period, P, is the shortest known for a comet with aretrograde orbit.     T = 2006 Sept. 3.833 TT          Peri. = 249.322     e = 0.68901                      Node  = 218.561   2000.0     q = 1.66976 AU                   Incl. = 160.021       a =  5.36919 AU     n = 0.079221     P =  12.4 yearsSUPERNOVA 2006ev IN UGC 11758     Michel Ory, Vicques, Switzerland, reports the discovery of anapparent supernova (red mag approximately 16.6) on CCD images takenon Sept. 12.9 and 13.8 UT with a 0.61-m f/3.88 reflector.  The newobject is located at R.A. = 21h30m59s.26 +/- 0s.05, Decl. =+13o59'21".2 +/- 0".2 (equinox 2000.0), which is 23" east and 11"north of the nucleus of UGC 11758.  Nothing is visible at thislocation on a red Palomar Sky Survey plate from 1953 Aug. 19 or ared U.K. Schmidt Telescope plate from 1991 Aug. 14.                      (C) Copyright 2006 CBAT2006 September 13              (8747)            Daniel W. E. Green

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