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IAUC 8932: C/2008 F1; C/2008 G1

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IAUC number 

                                                  Circular No. 8932
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2008 F1 (SOHO)
     Further to IAUC 8926, an additional apparent Meyer-group comet
has been found on SOHO website images; first appearing in images as
fairly bright (mag about 6) but fading fast, it was elongated in
the direction of motion (but not diffuse at all) -- typical for
Meyer-group objects.

 Comet        2008 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2008 F1    Mar. 19.938    0 03.9  + 1 22   C2     RK   2008-F32


COMET C/2008 G1 (GIBBS)
     A. R. Gibbs reports his discovery of a comet (discovery
observation tabulated below) on images taken with the Mt. Lemmon
1.5-m reflector, noting that four co-added 30-s unfiltered CCD
exposures show a very compact coma of diameter 4" and a narrow 65"
tail in p.a. 225 deg.  Following posting on the Minor Planet
Center's 'NEOCP' webpage, other astrometric observers have also
noted the object's cometary appearance, including L. Buzzi (Varese,
Italy, 0.60-m reflector, Apr. 7.92-7.96 UT; slightly diffuse with a
possible 10" tail in p.a. 225 deg), L. Donato and M. Gonano
(Remanzacco, Italy, 0.45-m reflector, Apr. 7.95-7.96; 100 stacked
unfiltered 60-s exposures show a coma diameter of nearly 10" and a
20" tail in p.a. 230 deg), E. Guido and G. Sostero (Castellammare
di Stabia, Italy, remotely using a 0.25-m reflector near Mayhill,
NM, U.S.A., Apr. 8.33-8.35; 50 co-added 60-s unfiltered exposures
show a short tail nearly 15" long toward p.a. 190 deg and a coma of
diameter 8"), J. G. Ries (McDonald Observatory, 0.76-m reflector,
Apr. 8.41-8.42; narrow tail approximately 20' long toward the
southwest), J. E. McGaha (Tucson, AZ, U.S.A., 0.36-m reflector, Apr.
9.32-9.34; eight co-added 60-s exposures show a 7" coma and a 22"
tail in p.a. 220 deg), and A. C. Gilmore and P. M. Kilmartin (Mt.
John 1.0-m reflector, Apr. 9.63-9.64; asteroidal head with narrow
15" tail in p.a. about 200 deg).

     2008 UT             R.A. (2000) Decl.       Mag.
     Apr.  7.35552   15 29 45.12   + 4 54 32.1   19.4

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2008-G58.

     T = 2009 Feb.  7.311 TT          Peri. =  71.159
                                      Node  = 215.550   2000.0
     q = 3.72077 AU                   Incl. =  72.036

                      (C) Copyright 2008 CBAT
2008 April 9                   (8932)            Daniel W. E. Green

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