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IAUC 8818: C/2007 E1

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                                                  Circular No. 8818
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 C/2007 E1 (GARRADD)
     G. J. Garradd reports the discovery of a comet with a 35" coma
on Siding Spring Survey exposures taken with the 0.5-m Uppsala
Schmidt telescope (discovery observation tabulated below).
Following posting on the Minor Planet Center's 'NEOCP' webpage,
numerous CCD observers have reported on the object's cometary
appearance, including A. Lepardo, V. Santini, and G. Sostero
(Remanzacco, Italy, 0.45-m reflector, Mar. 14.1 UT, co-addition of
60 unfiltered 60-s exposures reveals a diffuse coma of mag 15.2
almost 30" in diameter, elongated toward p.a. 290 deg); P.
Birtwhistle (Great Shefford, Berkshire, U.K., 0.40-m reflector,
Mar. 14.1, poor seeing at low altitude; coma diameter 20" with only
moderately condensed center, with 20" elongation of the coma in p.a.
300 deg); E. Guido (Castellammare di Stabia, Italy, remotely using
a 0.25-m reflector at Mayhill, NM, Mar. 14.4, coma diameter almost
30"); D. Tibbets and G. Hug (Eskridge, KS, 0.7-m reflector, Mar.
14.4, obvious coma about 15" wide extending more toward p.a. about
280 deg); J. Young (Table Mountain Observatory, 0.61-m reflector,
Mar. 14.4, round, 12" coma with bright central condensation and a
hint of a poorly defined faint, broad tail structure spanning p.a.
240-310 deg, extending for 40" in very long exposures); D. Mayes
(Table Mountain Observatory, 0.4-m reflector, Mar. 14.44-14.46,
bright round coma with a 7"-diameter central condensation, with an
ill-defined 8" tail in p.a. 265-275 deg); J. E. McGaha (Tucson, AZ,
0.62-m reflector, Mar. 14.5, bright central coma with a faint 60"
outer coma elongated at p.a. 275 deg); J. G. Ries (McDonald
Observatory, 0.76-m reflector + R filter, Mar. 14.5, object diffuse
and approximately 15" in diameter, slightly elongated toward the
northwest).

     2007 UT             R.A. (2000) Decl.       Mag.
     Mar. 13.71914   15 25 49.16   -26 24 42.2   14.6

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2007-E70.

     T = 2007 May  22.701 TT          Peri. =   3.341
                                      Node  = 152.260   2000.0
     q = 1.31547 AU                   Incl. = 174.495

                      (C) Copyright 2007 CBAT
2007 March 14                  (8818)            Daniel W. E. Green

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