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IAUC 8668: P/2005 SB_216; 2006Y, 2006Z

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                                                  Circular No. 8668
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

COMET P/2005 SB_216 (LONEOS)
     An apparently asteroidal object discovered by the LONEOS
project that was designated 2005 SB_216 by the Minor Planet Center
(discovery position below from MPS 144403) has been found to show
cometary appearance.  S. Foglia, Novara Veveri, Italy, reports that
CCD observations that he obtained with G. Galli, S. Minuto, and D.
Crespi using a 0.40-m f/4 reflector on 2005 Dec. 7 and 29 show the
object to be slightly diffuse; Foglia adds that CCD frames taken by
L. Buzzi with a 0.60-m f/4.6 reflector at Varese on 2006 Feb. 4.8
UT also show diffuseness.  F. Bernardi, D. J. Tholen, and J.
Pittichova, University of Hawaii (UH), report that two R-band 600-s
exposures taken with the UH 2.2-m reflector at Mauna Kea on Feb.
7.27 show the object to be fuzzy and slightly elongated about 2".7
in p.a. about 78 deg; in an aperture of 4".4, the magnitude was

     2005 UT             R.A. (2000) Decl.       Mag.
     Sept.30.38046    0 54 39.28   +14 22 54.3   19.1

The following orbital elements are taken from MPEC 2006-C48:

                    Epoch = 2007 Mar.  1.0 TT
     T = 2007 Feb. 11.3910 TT         Peri. =  83.5889
     e = 0.463528                     Node  =   1.6983  2000.0
     q = 3.817862 AU                  Incl. =  24.0974
       a =  7.116613 AU    n = 0.0519151    P =  18.98 years

     Two apparent supernovae have been reported:  2006Y by P.
Luckas, O. Trondal, and M. Schwartz (cf. IAUC 8655; unfiltered CCD
frames, 0.35-m Tenagra telescope at Perth) and 2006Z by the SDSS
collaboration (found in spectra; communicated by M. SubbaRao,
University of Chicago and Adler Planetarium; cf. IAUC 8513; r-band
magnitude given below).

SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2006Y   Feb. 3.58    7 13 17.19  -51 41 18.8  17.7  1".7 W, 5".2 N
2006Z   Feb. 1.51   13 44 58.07  +26 18 25.7  20.4      --

Additional unfiltered magnitudes of 2006Y:  Jan. 27.59 UT, [18.5;
Feb. 7.60, 17.3.  SN 2006Z, which appears to be a type-Ia supernova
with an age of approximately -7 +/- 4 days after maximum light, is
coincident with the center of the host galaxy (r = 17.0 from an
image taken on 2004 June 12; z = 0.1232).

                      (C) Copyright 2006 CBAT
2006 February 8                (8668)            Daniel W. E. Green

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