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IAUC 9153: C/2010 L3; C/1997 S6

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IAUC number 

                                                  Circular No. 9153
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


COMET C/2010 L3 (CATALINA)
     An apparently asteroidal object discovered by the Catalina Sky
Survey (discovery observation tabulated below), and posted on the
Minor Planet Center's 'NEOCP' webpage, has been found by other CCD
astrometrists to show cometary appearance.  R-band images taken by
W. H. Ryan with the Magdalena Ridge Observatory 2.4-m f/8.9
reflector on June 15.4 and 16.3 UT show the object to be diffuse
with a distinct coma (mag 19.2-19.4) and a tail in p.a. about 80
deg.  P. Birtwhistle (Great Shefford, Berkshire, England, 0.40-m
f/6 Schmidt-Cassegrain reflector; June 16.0) notes that the object
appears to be slightly more diffuse than nearby stars of similar
brightness, with a diameter of about 6" and no tail.  S. Foglia
writes that forty stacked 60-s exposures taken by R. Holmes
(Ashmore, IL, U.S.A., 0.61-m astrograph; June 16.3) show a round
coma of diameter 6".  E. Guido, Castellammare di Stabia, Italy,
reports that 25 stacked 120-s images taken by G. Sostero and
himself remotely with a 0.25-m f/3.4 reflector located near Mayhill,
NM, U.S.A., on June 16.3 show a coma that is about 12" in diameter.
D. Balam reports that images obtained on June 16.34 with the 1.82-m
Plaskett telescope of the Dominion Astrophysical Observatory
(National Research Council of Canada) show that the object has a
coma of diameter 6".  H. Sato (Ota-ku, Tokyo, Japan) writes that
his images, taken remotely with a 0.25-m f/3.4 reflector at the RAS
Observatory near Mayhill on June 16.4, show a condensed coma of
diameter 8" and total mag 19.0.

     2010 UT             R.A. (2000) Decl.       Mag.   Observer
     June 15.30348   16 50 44.30   +45 30 34.5   19.6   Catalina

The available astrometry, the following preliminary parabolic
orbital elements by B. G. Marsden, and an ephemeris appear on MPEC
2010-M09.

     T = 2011 July 10.279 TT          Peri. = 189.154
                                      Node  = 140.824   2000.0
     q = 2.33597 AU                   Incl. =  57.354


COMET C/1997 S6 (SOHO)
     Further to IAUC 9138, another Kreutz sungrazer (stellar in
appearance with peak magnitude about 7.5) has been found on SOHO C3
website images.

 Comet       1997 UT        R.A.(2000)Decl.   Inst.  F    MPEC
 C/1997 S6   Sept. 20.490   11 32.7  + 0 02    C3    JR   2010-L60

                      (C) Copyright 2010 CBAT
2010 June 16                   (9153)            Daniel W. E. Green

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