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IAUC 7338: C/1999 Y1

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                                                  Circular No. 7338
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 C/1999 Y1 (LINEAR)
     An object with unusual motion and reported as asteroidal by
LINEAR (discovery observation below) has been found to be cometary
in appearance following posting on the NEO Confirmation Page.  Z.
Moravec, Klet, reports that the object appeared slightly diffuse
with a possible coma of diameter about 10" on images taken in poor
seeing on Dec. 21 and 22.  G. Billings, Calgary, AB, reported an
apparent nebulosity of diameter about 12" on Dec. 23 CCD images
taken with a 0.36-m reflector, and he noted a faint tail about 20"
long in p.a. 70 deg on Dec. 27.  S. Nakano, Sumoto, Japan, reports
that H. Abe (Yatsuka, 0.26-m reflector) found the comet to be
evidently diffuse, T. Kojima (Chiyoda, 0.25-m reflector) found a
10" coma and a short tail toward the northeast, and T. Oribe (Saji
Observatory, 1.03-m reflector) found a 20" coma and a 30" tail in
p.a. 60 deg, all on Dec. 27.  A. Nakamura, Kuma, Japan, found coma
diameter 0'.35 and a faint tail in p.a. 60 deg on Dec. 27 (0.60-m
reflector).

     1999 UT             R.A. (2000) Decl.        m2
     Dec. 20.22291    3 47 47.39   +73 27 48.0   17.5

     The following parabolic orbital elements are taken from MPEC
1999-Y28, where the additional reported astrometry also appears:

     T = 2001 Mar. 23.798 TT          Peri. = 181.845
                                      Node  = 188.490   2000.0
     q = 3.19981 AU                   Incl. = 134.843

1999/00     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Dec. 28     3 20.6    +72 01.2   4.589   5.215  124.9    8.9   16.0
Jan.  7     2 54.40   +69 43.6   4.586   5.149  120.0    9.5   15.9
     17     2 36.87   +67 10.8   4.610   5.083  113.5   10.2   15.9
     27     2 26.12   +64 35.2   4.658   5.018  105.9   10.9   15.8
Feb.  6     2 20.39   +62 05.3   4.723   4.952   97.7   11.4   15.8
     16     2 18.33   +59 46.5   4.799   4.887   89.3   11.7   15.8
     26     2 18.92   +57 41.8   4.881   4.823   80.8   11.7   15.8
Mar.  7     2 21.45   +55 52.4   4.963   4.759   72.5   11.5   15.8
     17     2 25.40   +54 18.4   5.039   4.695   64.4   11.0   15.7

                      (C) Copyright 1999 CBAT
1999 December 27               (7338)            Daniel W. E. Green

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