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IAUC 7552: Poss. N IN Pup; 2000 Y3; RZ Leo

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                                                  Circular No. 7552
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)


POSSIBLE NOVA IN PUPPIS
     T. Kato, Kyoto University, reports the discovery by Kazuyoshi
Kanatsu (Matsue, Shimane, Japan) on his T-Max 400 film exposures of
a new variable star at R.A. = 7h37m58s, Decl. = -25o56'51" (equinox
2000.0).  Kanatsu finds no apparent counterpart on the Digital Sky
Survey.  K. Takamizawa (Saku-machi, Nagano) reports that the new
object was not present on 22 T-Max 400 exposures (limiting mag 14)
taken by himself between between 1994 Mar. 14 and 1999 Dec. 3; he
notes the presence of a close stellar companion of mag 14.5, which
is apparently a red star (red mag 13.6) in the USNO A2.0 catalogue
having position end figures 58s.43, 46".8.  Available magnitudes:
2000 Jan. 15.72 UT, [11.7 (Kanatsu; T-Max 400); Nov. 28.703, 8.6
(Takamizawa; T-Max 400); Dec. 22.578, 8.8 (Takamizawa); 22.731, 8.7
(Kanatsu); 30.585, 8.8 (A. Takao, Kitakyushu, Fukuoka, Japan;
unfiltered CCD); 30.612, 9.2 (R. Stubbings, Drouin, Victoria,
Australia; visual).


COMET 2000 Y3
     J. V. Scotti, Lunary and Planetary Laboratory, reports his
discovery of a comet with the 0.9-m Spacewatch telescope.  The
comet shows a coma diameter of 7" and a 0'.93 tail in p.a. 269 deg;
he also measures m_2 = 19.7.

     2000 UT             R.A. (2000) Decl.        m1
     Dec. 30.16318    5 56 29.44   +26 22 31.7
          30.18693    5 56 28.56   +26 22 31.2   18.9
          30.21016    5 56 27.63   +26 22 31.0   18.8


RZ LEONIS
     R. Ishioka, M. Uemura, T. Kato, H. Iwamatsu, and K. Matsumoto,
Kyoto University, report on behalf of the VSNET collaboration team:
"Unfiltered and V-band CCD photometry of RZ Leo (cf. IAUC 7547)
since Dec. 20.37 UT by G. Billings, G. Masi, S. Kiyota, and us
shows a complex feature with amplitude about 0.2 mag and period
0.07616 +/- 0.00021 day (close to the quiescent photometric period
of 0.0756 +/- 0.0012 day; Mennickent et al. 1999, A.Ap. 352, 239)
on Dec. 21 and 22 and a normal superhump feature (rapid rise;
slower decline) with amplitude about 0.4 mag and period 0.07857 +/-
0.00022 day on Dec. 23 and 24.  This suggests that the early
modulations are 'early superhumps' observed in WZ Sge-type dwarf
novae (cf. IAUC 6164, 6517) and current modulations are genuine
superhumps."

                      (C) Copyright 2000 CBAT
2000 December 30               (7552)            Daniel W. E. Green

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