THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
Tel. 617-354-0484 Fax 617-354-0665
AAVSO ALERT NOTICE 273 (March 20, 2000)
1828-14 NOVA SCUTI 2000
We have been informed by the Central Bureau for Astronomical Telegrams (IAU
Circular 7382) that Katsumi Haseda, Toyohashi, Aichi, Japan, discovered a nova
photographically on Mar. 5.81 UT using 10-cm f/4.0 twin patrol cameras. The
object was confirmed on a photo taken by Haseda on Mar. 13.819 UT at magnitude
11.6, and at magnitude 11.24 on unfiltered CCD images taken Mar. 14.9 UT by M.
Uemura and T. Kato, Kyoto University, Japan. No object appears on the
Digitized Sky Survey at the location of the nova to magnitude 19. Earlier
observations reported to the IAU (IAU Circular 7382) include: by Haseda,
Feb. 6.844 UT, 12.0 CCD; and photographic observations by K. Takamizawa,
Saku-machi, Nagano, Japan, using T-Max 400 film, Feb. 9.84, 12.2; 11.84, 12.0;
16.83, 11.8; Mar. 2.80, 9.9; 8.78, 12.0. Other images by Takamizawa and Haseda
taken between 16 August 1998 and 10 November 1999 show nothing down to
magnitude 13.0-14.5 at the location of the nova.
Spectroscopic confirmation was obtained by M. Fujii, Kurashiki, Okayama,
Japan, who obtained spectra on Mar 16.81 UT using an 0.28-m reflector that
showed the object to be a nova.
H. Yamaoka, Kyushu University, Japan, measured the CCD image taken by Uemura
and Kato, and gives the following position for N Sgr 2000:
R.A. = 18h 34m 03.16s Decl. = -14 degrees 45' 11.46" (2000)
Accompanying is a CCD image obtained on Mar. 16.5 UT by J. Quinn and P.
Garnavich, University of Notre Dame, using the 1.8-m Vatican Advanced
Technology Telescope at Mt. Graham, and showing the nova at R magnitude
11.3 +/- 0.1, and quite blue in color. The image may also be seen at
S. O'Connor, Montreal, Quebec, Canada, observed N Sct 00 at CCDV magnitude
11.88 on Mar. 18.429 UT.
Also ccompanying is an AAVSO "d" scale Preliminary chart prepared by C. Scovil
and K. Malatesta showing the nova. Please use this chart to observe 1828-14
N Sct 00 and report your observations to AAVSO Headquarters. Please be sure
to indicate which comparison stars you used to make your observations.
Congratulations to Katsumi Haseda on discovering this nova!
2138+43 SS CYGNI BEING OBSERVED WITH RXTE FOR THREE MONTHS
Astronomers at the University of Leicester, England, have informed us that they
have obtained time to make extended observations of the cataclysmic variable
SS Cyg with the RXTE satellite. Observations began last week, and the
satellite will continue to observe SS Cyg every twelve hours for the next three
months. Our assistance has been requested to monitor SS Cyg throughout this
period in order to provide good optical data for correlation with the x-ray
data from the satellite.
Please monitor SS Cyg closely throughout the coming three months and report
your observations to AAVSO Headquarters so we may keep the astronomers
informed. SS Cyg is somewhat difficult to observe during this season for all
but observers at far northern latitudes, so whatever efforts you can make will
be very valuable and very much appreciated. Good visual coverage will be
crucial to the success of this unique, extended observing run.
AAVSO Standard charts for SS Cyg may be downloaded from the AAVSO website, or
obtained from Headquarters on request. When reporting your observations,
please be sure to indicate which comparison stars you used.
CHARTS AVAILABLE ON AAVSO WEB AND FTP SITES
Electronic copies of the charts of N Sct 00 and SS Cyg mentioned in this Alert
Notice are available through our web site at the following address:
The charts may also be obtained directly from our FTP site:
ftp.aavso.org (184.108.40.206), in /alerts/alert273
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
Many thanks for your valuable astronomical contributions and your efforts.
Janet A. Mattei
Elizabeth O. Waagen
Senior Technical Assistant