[IAUC] IAUC 8690: C/2006 F1; 2006at, 2006av, 2006aw [25139-2006/04-R1]

Vie Jun 22 17:08:24 ART 2007

                                                  Circular No. 8690
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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COMET C/2006 F1 (KOWALSKI)
     R. A. Kowalski reports the discovery of a comet on CCD images
taken in poor seeing (4" FWHM) with the 1.5-m reflector in the
course of the Mt. Lemmon Survey (discovery observation tabulated
below); the object appeared slightly condensed with a diameter of
approximately 8", elongated in p.a. approximately p.a. 265 deg
(though no obvious tail).  On images taken with the same telescope
by E. J. Christensen on Mar. 23.5 UT, the object displays a
condensed 8" coma and a 10" tail in p.a. about 245 deg.  CCD images
taken by P. Birtwhistle with a 0.40-m f/6 Schmidt-Cassegrain
reflector at Great Shefford, U.K., on Mar. 23.1 show the object
with a 8" coma and a tail 15" long in p.a. 245 deg.

     2006 UT             R.A. (2000) Decl.       Mag.
     Mar. 21.49155   16 21 29.96   + 2 00 22.3   18.8

The available astrometry, the following parabolic orbital elements,
and an ephemeris appear on MPEC 2006-F20.

     T = 2007 May  19.709 TT          Peri. = 208.890
                                      Node  = 124.985   2000.0
     q = 1.93896 AU                   Incl. =  21.585

SUPERNOVA 2006at, 2006av, 2006aw
     Further to IAUC 8666, L. A. G. Monard reports his discovery of
two apparent supernovae on unfiltered CCD images:

SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2006av  Feb. 19.776  2 57 46.48  -36 42 26.2  18.3  30" W, 38" N
2006aw  Mar. 15.747  5 04 18.18  -63 34 57.3  14.9  7" W, 2" S

Additional approximate magnitudes from Monard for 2006av in ESO
356-22:  Jan. 31.757 UT, [18.5; Feb. 28.80, 18.7 +/- 0.4 (mediocre
conditions; stacked images); Mar. 5.735, 19.0 +/- 0.2; 20.774, 18.3
+/- 0.3.  Nothing is visible at the location of 2006av on the
Digitized Sky Survey in all bands (including limiting red mag 20.5).
Additional approximate magnitudes for 2006aw in ESO 85-G38:  Feb.
16.783, [18.5; Mar. 15.858, 14.9 +/- 0.2; 19.751, 15.2.  Nothing is
present at the location of 2006aw on a red Digitized Sky Survey
image (limiting mag 20.5).
     SN 2006at (cf. IAUC 8687) has been confirmed to be a type-II
supernova by S. Blondin et al. (details on CBET 441).

                      (C) Copyright 2006 CBAT
2006 March 24                  (8690)            Daniel W. E. Green