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IAUC 8247: P/2003 UY_275; P/2001 RG_100 = 1979 O1; C/2001 Q4

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IAUC number


                                                  Circular No. 8247
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/2003 UY_275 (LINEAR)
     An apparently asteroidal object discovered by the LINEAR
project (discovery observation below from MPS 90712; other
observations on MPS 91955, orbital elements on MPEC 2003-W49) has
been found to show cometary appearance on CCD images taken with the
Mt. Hopkins 1.2-m reflector on Nov. 30.25 UT by C. W. Hergenrother;
his co-added 1200-s R-band exposures show a highly condensed 16"
coma and a narrow tail 100" long in p.a. 280 deg (mag 18.5
determined by T. B. Spahr).  Also, R. S. McMillan noted the object
as diffuse in Spacewatch incidental observations made on Nov. 30.4.

     2003 UT             R.A. (2000) Decl.       Mag.
     Oct. 29.32233    4 57 33.53   +26 23 38.1   20.2

     Additional astrometry, the following improved orbital elements
from observations Oct. 5-Dec. 1, and an ephemeris appear on MPEC
2003-X17.

     T = 2003 July  2.0831 TT         Peri. = 119.3746
     e = 0.508882                     Node  = 245.7513  2000.0
     q = 1.831486 AU                  Incl. =  16.3301
       a =  3.729221 AU    n = 0.1368601    P =   7.202 years


COMET P/2001 RG_100 = 1979 O1
     Further to IAUC 8244, S. Nakano (Sumoto, Japan) reports that
comet P/2001 RG100 (LINEAR) is identical with C/1979 O1 = 1979h
(Kowal; cf. IAUC 3395 and 3397; MPC 4904 and 4998), suspected at
the time as being of short period but lost immediately after
discovery.  Nakano's improved orbital elements, given on Nakano
Note 995, are very similar to those for the 2002 and 1992 epochs on
MPEC 2003-W74, and he also gives elements for a 1981 epoch (T =
1981 Sept. 14).


COMET C/2001 Q4 (NEAT)
     Visual total-magnitude estimates:  Aug. 26.56 UT, 12.0 (D. A.
J. Seargent, Cowra, N.S.W., 0.25-m reflector); Sept. 1.82, 12.2 (A.
Pearce, Nedlands, W. Australia, 0.41-m reflector); 17.56, 11.6
(Seargent, 25x100 binoculars); Oct. 2.13, 12.0 (A. Amorim,
Florianopolis, Brazil, 0.14-m reflector); Nov. 3.27, 11.1 (Amorim);
11.43, 10.4 (Seargent); 20.02, 10.6 (Amorim); 27.45, 10.2
(Seargent).

                      (C) Copyright 2003 CBAT
2003 December 2                (8247)            Daniel W. E. Green

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