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			THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS 
				25 Birch Street, Cambridge, MA 02138 USA
			BITNET: aavso@cfa8 SPAN: nssdca::cfa8::aavso 
				INTERNET: aavso@cfa0.harvard.edu 
			Tel. 617-354-0484	FAX 617-354-0665

			AAVSO ALERT NOTICE 177 (September 17,1993)

1806-29 NOVA SAGITTARII 1993

We have been informed by our member William Liller, Vina del Mar, Chile, and the 
Central Bureau for Astronomical Telegrams of the independent photographic discoveries 
of a nova in Sagittarius by Matsuo Sugano, Minami-Oda, Japan, and William Liller. 
Magnitude estimates are August 27.02 UT, < 11.5 (Liller, with Tech Pan film and orange 
filter); September 14.508, 9.0 (Sugano, with Tri-x film) (IAU Circular 5862); September 
16.043, 7.9 (Liller, averaged from 2 photographs); September 17.058, 8.41 (Liller, CCD plus 
Optec V filter). A. C. Gilmore, Mt. John University, New Zealand, provides the following 
precise position for this nova:

		R.A.18h 09m 38.40s Decl. -29deg 29'54.0" (1950).

A. C. Gilmore also provides the following V magnitudes for this nova: September 17.414 
UT, 8.59; 17.434, 8.57. These magnitudes were obtained using the following comparison 
and check stars: SAO 186445, V = 7.747; and SAO 186457, V = 9.100. An additional visual 
observation was reported by R. Royer, Wrightwood, CA, on September 17.146 UT at 8.5.

Spectra obtained at the European Southern Observatory, La Silla, Chile, on September 
16.97 UT confirms this object as a nova a few days past maximum (IAU Circular 5863).

Please use the accompanying "b" scale AAVSO chart, prepared by C. Scovil, and the 
accompanying "d" scale chart for VZ Sgr from the Royal Astronomical Society of New 
Zealand, Variable Star Section, which has the nova marked on it and shows the field in 
more detail, to observe N Sgr 93, and report your observations to AAVSO Headquarters. 
The answering machine is on nights and weekends for your convenience.

Our sincere congratulations to M. Sugano and W. Liller!

OUTBURST OF 0409-71 VW HYDRI

Our member Danie Overbeek, Edenvale, South Africa, has just telephoned us to report 
that the dwarf nova VW Hyi has started to brighten, as indicated by the following 
observations: September 17.078 UT, 12.4; 17.096, 12.3; 17.125,

This star is one of the observing targets for the ORFEUS mission. It has also been 
scheduled to be observed with the Hubble Space Telescope on September 25. Please 
monitor VW Hyi closely, and telephone your observations to AAVSO Headquarters so that 
we may inform the astronomers who are interested in observing this star with two NASA 
satellites.

Our sincere thanks to our observers who have been calling in their observations of 
cataclysmic variables to aid the ORFEUS mission. We very much appreciate your 
dedicated efforts and your valuable astronomical contributions.

Good observing!

Janet A. Mattei 
Director

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