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IAUC 7372: C/2000 D2; 2000L; V4633 Sgr

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IAUC number

                                                  Circular No. 7372
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

     An apparently asteroidal object discovered by LINEAR and
posted on the NEO Confirmation Page has been observed to be
cometary by F. B. Zoltowski (Edgewood, NM; very diffuse image on
Feb. 28.1 UT; 12" tail in p.a. 270 deg on Mar. 1.1) and by C.
Hergenrother (Catalina 1.54-m reflector; 8" coma and very faint 15"
tail in p.a. 105 deg on Mar. 1.3).  Full astrometry and parabolic
orbital elements (T = 2000 Mar. 2.3 TT, q = 2.323 AU, i = 156.9
deg) appear on MPEC 2000-E04.

     2000 UT             R.A. (2000) Decl.        m2
     Feb. 25.19852    6 48 19.35   +52 53 53.6   18.1

     T. Puckett, Mountain Town, GA, reports the discovery of an
apparent supernova (mag 17.8) on an unfiltered CCD frame (limiting
mag 19.3) taken with the Puckett Observatory 0.35-m supernova
patrol telescope on Feb. 29.13 UT.  The candidate is located at
R.A. = 10h15m01s.82, Decl. = +65o08'03".5 (equinox 2000.0), which
is 6".9 east and 19".3 south of the center of UGC 5520.  The new
object was also present on an unfiltered CCD frame taken on Mar.
1.02, but it was not present on a frame taken on 2000 Jan. 7.25,
and it does not appear on Palomar Sky Survey images taken on 1997
Jan. 11 (limiting mag about 21.2) and 1953 Feb. 8 (limiting mag
about 20.1).

     Y. Lipkin and E. M. Leibowitz, Wise Observatory, Tel Aviv
University, report:  "We performed CCD photometry of V4633 Sgr with
the Wise Observatory 1-m telescope through an I filter during 36
nights in 1999.  Time-series analysis of the data reveals two
distinct periodicities at 0.128791 +/- 0.000004 and 0.125573 +/-
0.000005 day.  The full amplitudes of the periodicities are 0.097
and 0.081 mag, respectively.  We cannot rule out that the 1-day
aliases of these periodicities, at 0.147833 and 0.143674 day, are
the true periods.  The former alias is, to within the accuracy of
our measurments, one of the periods reported in 1998 by Lipkin et
al. (IAUC 6963).  After re-examining the data of our six observing
nights in 1998, we find that the second periodicity of 1999 is
present in 1998 as well, with the same period as in 1999, to within
the accuracy of our measurments.  The full amplitudes of the
periodicities in 1998 are 0.026 and 0.020 mag, respectively."

                      (C) Copyright 2000 CBAT
2000 March 1                   (7372)            Daniel W. E. Green

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