Circular No. 8747 Central Bureau For Astronomical Telegrams ...
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 UB313 (cf. IAUC 8577) to be considered
representative “dwarf planets”, the Minor Planet Center included Pluto
and 2003 UB313 (along with two other new potential dwarf-planet candi-
dates) 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 Nomen-
clature 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 UB313) 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
o
= 2006 Sept. 3.833 TT
ω = 249.322
e = 0.68901
Ω = 218.561
2000.0
q = 1.66976 AU
i = 160.021
a = 5.36919 AU
no = 0.079221
P = 12.4 years
SUPERNOVA 2006ev IN UGC 11758
Michel Ory, Vicques, Switzerland, reports the discovery of an appar-
ent supernova (red mag ≈ 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 α =
21h30m59s.26 ± 0s.05, δ = +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.
2006 September 13
c Copyright 2006 CBAT
Daniel W. E. Green
