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Alert Notice 279

          THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
                25 Birch Street, Cambridge, MA 02138 USA
                       INTERNET:  aavso@aavso.org
                Tel. 617-354-0484       Fax 617-354-0665


                AAVSO ALERT NOTICE 279 (January 2, 2001)


0733-25 N? PUP 2000  -  POSSIBLE NOVA IN PUPPIS

We have been informed by the Central Bureau for Astronomical Telegrams (IAU
Circular 7552, December 30), and we announced in AAVSO News Flash No. 717,
that T. Kato, Kyoto University, Japan, reports that Kazuyoshi Kanatsu, Matsue,
Shimane, Japan, photographically discovered a possible nova in Puppis on
December 22.731 UT at photographic magnitude 8.7, using T-Max 400 film.
According to Kanatsu, nothing is seen at the location of the object on the
Digitized Sky Survey, or down to magnitude 11.7 on a T-Max image taken by
himself on Jan. 15.72 UT.

The object is located at:

       R.A. = 07h 37m 58s     Decl. = -25 degrees 56' 51"   (2000.0)

K. Takamizawa, Saku-machi, Nagano, Japan, who found the object at photographic
magnitude 8.6 on Nov. 28.703 UT and 8.8 on Dec. 22.578 UT on T-Max film,
reports that nothing was present at the location of the object down to
photographic magnitude 14 on his 22 T-Max exposures taken between 1994 Mar. 14
and 1999 Dec. 3.  Takamizawa also notes the presence of a magnitude 14.5 close
stellar companion, listed in the USNO A2.0 catalogue at red magnitude 13.6 and
position end figures 58.43s, 46.8". (IAU Circular 7552)

Observations of N? Pup 00 reported to the AAVSO include: Nov. 23.78 UT, 8.8
photographic, K. Haseda, Aichi, Japan (T-Max 400 film; via T. Kato, IAU
Circular 7553); Dec. 01.77, 8.8 photographic, Haseda (via T. Kato, IAU Circular
7553); 30.585 UT, 8.8 CCD, A. Takao, Kitakyushu, Fukuoka, Japan (IAU Circular
7552); 30.612, 9.2, R. Stubbings, Drouin, Victoria, Australia; 30.662, 9.2,
Stubbings; 30.772, 9.0, D. Overbeek, Edenvale, South Africa; 31.0743, 9.1, S.
Otero, Buenos Aires, Argentina; 31.3056, 9.2, Otero; 31.3225, 9.1 CCD, C.
Pullen, Wilton, CA; 31.569, 9.2, Stubbings; 31.600, 9.3, Stubbings; Jan.
01.026, 9.0, M. Reszelski, Szamotuly, Poland; 01.0777, 9.1, Otero; 01.504,
9.2, Stubbings; 02.0333, 9.1:, Otero.

Accompanying are AAVSO preliminary 'b' and 'd' scale charts of N? Pup 00
prepared by C. Scovil and K. Malatesta, AAVSO Headquarters.  Please
use them to observe the nova, and report your observations to AAVSO
Headquarters, making sure to indicate which comparison stars you used.

Congratulations to Kazuyoshi Kanatsu on his discovery!


SUPEROUTBURSTS OF 1132+02 RZ LEONIS AND 0203+56A UV PERSEI

Two SU UMa-type cataclysmic variables are undergoing rare superoutbursts at
present.

As reported in AAVSO News Flash No. 714 and updated in No. 716, RZ Leo went
into outburst on Dec. 20 UT. It is declining from maximum, and as of Jan.
02 UT was at visual magnitude approximately 14.0.

As reported in AAVSO News Flash No. 716, UV Per went into outburst on
Dec. 25 UT. It, too, is declining from maximum, and as of Jan. 02 UT was at
visual magnitude approximately 12.7.

Both of these stars have been closely monitored by AAVSO observers.  The
observations of RZ Leo and UV Per reported to the AAVSO may be found in the
Quick Look files on the AAVSO website (http://www.aavso.org).

Ronald Zissell, South Hadley, MA, obtained excellent runs of CCD observations
of the superhumps of both these stars.  Analyses of these observations for
publication are underway.


REMINDER - CHANDRA and RXTE OBSERVATIONS PLANNED FOR 2138+43 SS CYGNI

As announced in AAVSO News Flash No. 712, astronomers at Lawrence Livermore
National Laboratory and the University of Leicester, England, are planning to
use the Chandra and RXTE satellites to make observations of the dwarf nova
SS Cyg during its next outburst.  Please keep a very close eye on this star
and inform AAVSO Headquarters when you see it going into outburst, i.e., become
brighter than magnitude 11.5.


CHARTS AVAILABLE ON AAVSO WEB AND FTP SITES

Electronic copies of the charts of Nova Pup 2000, UV Per, and SS Cyg mentioned
in this Alert Notice are available through our web site at the following
address:

                         http://www.aavso.org

They may also be obtained directly from our FTP site:

             ftp.aavso.org (198.116.78.2), in /alerts/alert279

The answering machine at AAVSO Headquarters is on nights and weekends for
your convenience. Please call our charge-free number (888-802-STAR =
888-802-7827) to report your observations. We also encourage observers to
send observations by fax to 617-354-0665 or by e-mail through the Internet
to observations@aavso.org.

Many thanks for your valuable astronomical contributions and your efforts.

Good observing!

Janet A. Mattei
Director

Elizabeth O. Waagen
Senior Technical Assistant

Keywords:
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484