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IAUC 7167: P/1999 DN_3

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                                                  Circular No. 7167
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET P/1999 DN_3
     The apparently asteroidal object 1999 DN_3, observed by K.
Korlevic and M. Juric at Visnjan (0.41-m f/4.3 reflector + CCD) on
Feb. 19.0 and 24.0 UT (MPC 33833, MPS 4018), was linked by G. V.
Williams, Minor Planet Center, to observations on Apr. 6 and 14 in
routine asteroidal astrometry from LINEAR.  Owing to the unusual
nature of the orbit, computed yesterday, the object was added to
The NEO Confirmation Page.  In response to this, further
observations were reported on May 14.2 by D. A. Klinglesmith, III,
and R. Huber (Etscorn Observatory) and by G. Hug (Farpoint
Observatory).  Williams also identified LONEOS observations of the
object on Apr. 10.  In addition, C. W. Hergenrother, Lunar and
Planetary Laboratory, reports that observations made last night
with the 1.5-m Catalina reflector show the object to be cometary,
with a compact, well-condensed 10" coma and a strongly curved 30"
tail, starting in p.a. 45 deg and curving to p.a. 335 deg.  The
discovery observation is given below; all the available astrometric
observations appear on MPEC 1999-J39.

     1999 UT             R.A. (2000) Decl.        m2
     Feb. 18.97279   13 02 10.41   - 6 47 52.8   18.7

The following orbital elements by Williams are from 20
observations, Feb. 18-May 14 (mean residual 0".85):

                    Epoch = 1998 Sept.24.0 TT
     T = 1998 Sept.27.0993 TT         Peri. = 160.8131
     e = 0.135067                     Node  =   5.9635  2000.0
     q = 3.909738 AU                  Incl. =  18.7527
       a =  4.520279 AU    n = 0.1025548    P =   9.611 years

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m2
May  12    12 16.32   - 6 39.8   3.193   3.975  135.4   10.3   18.5
     22    12 14.05   - 6 47.7   3.310   3.981  125.3   12.0   18.6
June  1    12 13.41   - 7 02.9   3.442   3.987  115.7   13.3   18.7
     11    12 14.34   - 7 25.7   3.584   3.993  106.5   14.1   18.8
     21    12 16.75   - 7 56.0   3.734   3.999   97.7   14.6   18.9
July  1    12 20.52   - 8 33.4   3.886   4.006   89.3   14.7   19.0
     11    12 25.49   - 9 17.3   4.039   4.013   81.3   14.5   19.1
     21    12 31.54   -10 07.1   4.188   4.020   73.5   14.0   19.2
     31    12 38.52   -11 02.2   4.332   4.027   66.0   13.3   19.2

                      (C) Copyright 1999 CBAT
1999 May 14                    (7167)            Daniel W. E. Green

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