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IAUC 7553: P/2000 Y3; P/2000 S4; Poss. N IN Pup

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                                                  Circular No. 7553
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/2000 Y3 (SCOTTI)
     Additional astrometry, including prediscovery observations by
LINEAR on Nov. 29 and Dec. 21 identified by B. G. Marsden, appear
on MPEC 2000-Y47, together with the following orbital elements
showing this to be a short-period comet.  The elements indicate an
approach to within 0.05 AU of Jupiter in Sept. 1998.  Further to
IAUC 7552, J. V. Scotti notes that the comet showed a 7" coma and a
1'.16 tail in p.a. 270 deg on a Spacewatch CCD image taken on Dec.
31.174 UT.  An image obtained at Klet on Dec. 30.79 shows a coma
diameter of 8" and m_1 = 17.5.

     T = 2000 Nov.  6.5067 TT         Peri. =  89.3025
     e = 0.200779                     Node  = 355.0977  2000.0
     q = 4.044148 AU                  Incl. =   2.2469
       a =  5.060113 AU    n = 0.0865892    P =  11.383 years

2000/01     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Dec. 22     6 01.96   +26 23.6   3.065   4.048  177.0    0.7   17.5
Jan.  1     5 55.30   +26 22.0   3.083   4.050  168.0    2.9   17.5
     11     5 49.28   +26 17.8   3.130   4.052  156.6    5.5   17.6
     21     5 44.44   +26 11.8   3.206   4.054  145.4    7.9   17.6
     31     5 41.18   +26 04.9   3.305   4.057  134.5   10.0   17.7
Feb. 10     5 39.73   +25 58.0   3.424   4.061  124.1   11.6   17.8
     20     5 40.15   +25 51.6   3.559   4.064  114.1   12.8   17.8
Mar.  2     5 42.41   +25 46.0   3.704   4.068  104.6   13.6   17.9
     12     5 46.38   +25 41.1   3.856   4.072   95.5   14.1   18.0


COMET P/2000 S4 (LINEAR-SPACEWATCH)
     The IAU Committee on Small Bodies Nomenclature has given to
comet P/2000 S4 (cf. IAUC 7502) the name LINEAR-Spacewatch.


POSSIBLE NOVA IN PUPPIS
     T. Kato, Kyoto University, forwards the following additional
prediscovery photographic magnitudes for the new variable reported
on IAUC 7552, from T-Max 400 film exposures obtained by K. Haseda,
Aichi, Japan:  Nov. 23.78 UT, 8.8; Dec. 1.77, 8.8.

                      (C) Copyright 2000 CBAT
2000 December 31               (7553)            Daniel W. E. Green

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