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IAUC 8790: C/2006 XA_1; 2006tf

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IAUC number 

                                                  Circular No. 8790
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)


COMET C/2006 XA_1 (LINEAR)
     An apparently asteroidal object discovered by the LINEAR
survey (discovery observation tabulated below, from MPS 192575;
also rediscovered by LINEAR on 2007 Jan. 8), and posted on the
Minor Planet Center's 'NEOCP' website, has been reported as being
cometary in appearance by numerous CCD observers, including D.
Healy (Sierra Vista, AZ, U.S.A., 0.81-m f/4.4 Ritchey-Chretien
telescope; Jan. 9.11-9.17 UT, diffuse coma), E. Cortes (Mataro,
Spain, 0.25-m f/4.4 Schmidt-Cassegrain telescope; Jan. 9.8,
concentrated coma with no tail), J. E. McGaha (Tucson, AZ, U.S.A.,
0.36-m f/10 Schmidt-Cassegrain telescope; Jan. 10.15-10.16, four
stacked 60-s CCD images show a round 24" coma and a faint, stellar
nucleus with no tail), E. Guido and G. Sostero (Castellammare di
Stabia, Italy, observing remotely using a 0.25-m f/3.4 reflector
near Mayhill, NM, U.S.A.; Jan. 10.34-10.35, 10" tail in p.a. 310
deg), and J. Young (Table Mountain, 0.61-m f/16 Cassegrain
reflector; Jan. 10.2, 12" faint outer coma surrounding a 5"
centrally condensed area; no tail seen in moderate cirrus overcast).

     2006 UT             R.A. (2000) Decl.       Mag.
     Dec.  9.20056    2 39 54.17   +58 47 10.8   17.6

Additional astrometry, the following parabolic orbital elements,
and an ephemeris appear on MPEC 2007-A34.

     T = 2007 July 20.959 TT          Peri. = 187.386
                                      Node  = 318.611   2000.0
     q = 1.80118 AU                   Incl. =  30.634


SUPERNOVA 2006tf
     Further to IAUC 8622, R. Quimby, F. Castro, and P. Mondol,
University of Texas, report the discovery of a supernova on
unfiltered CCD images taken on 2006 Dec. 12.48 and 16.48 UT (both
at mag about 16.7) using the 0.45-m ROTSE-IIIb telescope at the
McDonald Observatory.  SN 2006tf is located at R.A. = 12h46m15s.82,
Decl. = +11o25'56".3 (equinox 2000.0), which is 0".2 east and 0".7
north of the center of the faint apparent host galaxy; nothing
appeared at this location in co-added of ROTSE-IIIb images taken
between 2004 Dec. and 2005 June (limiting mag about 19.1).  A
spectrum (range 420-890 nm) of 2006tf, obtained on Dec. 22.50,
shows it to be a type-IIn supernova (details on CBET 793).

                      (C) Copyright 2007 CBAT
2007 January 10                (8790)            Daniel W. E. Green

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