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

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IAUC number


                                                  Circular No. 8747
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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 0081-0304
Phone 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 that
the solar system contains eight "planets" (Mercury-Neptune), with
(1) Ceres, Pluto (cf. IAUC 255), and 2003 UB_313 (cf. IAUC 8577) to
be considered representative "dwarf planets", the Minor Planet
Center included Pluto and 2003 UB_313 (along with two other new
potential dwarf-planet candidates) in the standard catalogue of
numbered objects with well-determined orbits as (134340) and
(136199), respectively (see MPC 57525).  Following near-unanimous
acceptance by both the Committee on Small-Body Nomenclature and the
Working Group on Planetary-System Nomenclature (in consultation
with the discovery team), the IAU Executive Committee has now
approved 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 the
permanent number 178P (cf. MPC 57382).


COMET P/2006 R1 (SIDING SPRING)
     Additional astrometry and the following improved orbital
elements for this comet (cf. IAUC 8744) appear on MPEC 2006-R47.
The orbital period, P, is the shortest known for a comet with a
retrograde 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 years


SUPERNOVA 2006ev IN UGC 11758
     Michel Ory, Vicques, Switzerland, reports the discovery of an
apparent supernova (red mag approximately 16.6) on CCD images taken
on Sept. 12.9 and 13.8 UT with a 0.61-m f/3.88 reflector.  The new
object 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 this
location on a red Palomar Sky Survey plate from 1953 Aug. 19 or a
red U.K. Schmidt Telescope plate from 1991 Aug. 14.

                      (C) Copyright 2006 CBAT
2006 September 13              (8747)            Daniel W. E. Green

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