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IAUC 8893: COMET P/2007 V1 (LARSON); C/2004 E5

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IAUC number

                                                  Circular No. 8893
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     S. M. Larson reports his discovery of a comet (discovery
observation tabulated below) on CCD images obtained with the 0.68-m
Schmidt reflector in the course of the Catalina Sky Survey; he
reported a 40" tail in p.a. 230 deg.  Following posting on the
Minor Planet Center's NEOCP webpage, several other CCD
astrometrists have commented on the comet's physical appearance.  P.
Birtwhistle (Great Shefford, Berkshire, England, 0.40-m f/6 Schmidt-
Cassegrain reflector, Nov. 9.0 UT) found a concentrated coma of
diameter 6" with a 30" tail in p.a. 235 deg.  J. Lacruz (Madrid,
Spain, 0.40-m Ritchey-Chretien reflector, Nov. 9.0) measured a 30"
tail in p.a. 240 deg.  G. Hug (Eskridge, KS, U.S.A., 0.7-m
reflector, Nov. 9.4) reports detecting "a short defined tail" in
p.a. about 250 deg.  E. Guido and G. Sostero (Castellammare di
Stabia, Italy, remotely using a 0.25-m f/3.4 reflector located near
Mayhill, NM, U.S.A., Nov. 9.4) write that a co-addition of forty
60-s unfiltered exposures on Nov. 9.4 reveals the presence of a
diffuse coma nearly 12" in diameter with total mag about 18.3.
J. G. Ries (McDonald Observatory, 0.76-m reflector + prime-focus
corrector, Nov. 9.3) finds a very clear tail approximately 64" long
pointing almost exactly southwest.  R. E. Hill (Mt. Lemmon 1.5-m
reflector, Nov. 9.4) adds that a co-addition of four 60-s exposures
shows a broad 7' tail in p.a. 240 deg and a well-defined nuclear
condensation 5"-6" across; the total mag was given as 17.7.

     2007 UT             R.A. (2000) Decl.       Mag.
     Nov.  8.31007    3 14 10.71   +30 01 12.8   17.3

The available astrometry, the following elliptical orbital elements,
and an ephemeris appear on MPEC 2007-V72.

     T = 2007 Dec.  8.5940 TT         Peri. =  51.4714
     e = 0.461170                     Node  =   8.1899  2000.0
     q = 2.676678 AU                  Incl. =  10.7903
       a =  4.967569 AU    n = 0.0890201    P =  11.07 years

     Further to IAUC 8892, another slightly diffuse Kreutz-
sungrazing comet of mag about 7.5 has been found on archival SOHO
website images.

 Comet        2004 UT      R.A.(2000)Decl.   Inst.  F    MPEC
 C/2004 E5    Mar. 1.321  23 03.3   - 8 08   C3     BZ   2007-U23

                      (C) Copyright 2007 CBAT
2007 November 9                (8893)            Daniel W. E. Green

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