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IAUC 8749: P/2006 S1; 2006ew-2006fn

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                                                  Circular No. 8749
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 P/2006 S1 (CHRISTENSEN)
     E. J. Christensen reports the discovery of another comet on
Catalina Sky Survey images taken with the 0.68-m Schmidt telescope,
the object displaying a well-condensed 15" coma and a 2' straight
and narrow tail in p.a. 245 deg (discovery observation tabulated
below).  Following posting on the 'NEO Confirmation Page', numerous
CCD observers have reported information on the comet's coma
diameter:  Sept. 16.9 UT, 13" (J. Lacruz, Madrid, Spain, 0.30-m
reflector); 17.3, 10" (J. Young, Table Mountain, 0.61-m reflector;
with a bright, round central condensation); 17.3, 6" (J. E. McGaha,
Tucson, AZ, 0.62-m reflector, six 60-s stacked images); 17.35-17.38,
>/= 12" FWHM (D. T. Durig, T. E. Stegall, and E. A. Pierce, Sewanee,
TN, 0.30-m reflector).  Reported tail lengths and position angles:
Sept. 16.9, 32", 235 deg (Lacruz); 16.9, 3', 237 deg (A. Baransky,
Kiev, 0.7-m reflector); 16.94, 25", 230 deg (G. Sostero and E.
Guido, Remanzacco, Italy, 0.25-m reflector); 16.95-16.96, --, 229
deg (R. Ferrando and M. Ferrando, Valencia, Spain, 0.36-m
reflector); 17.3, 80", 235 deg (Young; tail curves slightly after
30" with a p.a. spanning 235 deg-265 deg, showing a slight fan
shape); 17.3, 211" (10" wide), 217 deg (McGaha); 17.35-17.38, 1'.5,
about 237 deg (Durig et al.).

     2006 UT             R.A. (2000) Decl.       Mag.
     Sept.16.24646   23 25 47.64   +24 50 12.9   17.4

The available astrometry, the following preliminary elliptical
orbital elements, and an ephemeris appear on MPEC 2006-S07.

     T = 2006 Aug. 27.422 TT          Peri. = 124.815
     e = 0.61999                      Node  = 214.641   2000.0
     q = 1.35354 AU                   Incl. =  11.610
       a =  3.56182 AU     n = 0.146621     P =   6.7 years


SUPERNOVAE 2006ew-2006fn
     On CBETs 621 and 623, J. Frieman reports the discovery details
for 18 supernovae on behalf of the Sloan Digital Sky Survey II
collaboration.  All the new objects are at g magnitude 20 or
fainter except for 2006ez (predicted to reach mag 19.3 in mid-
Sept.), 2006fd (reported at mag 19.4 on Aug. 27), and 2006fg (at
mag 19.1 on Aug. 28).  All are type-Ia events except for two type-
II supernovae (2006ez and 2006fg) and 2006fe (whose type was not
yet determined).

                      (C) Copyright 2006 CBAT
2006 September 17              (8749)            Daniel W. E. Green

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