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Alert Notice 177: Nova Sagittarii 1993 [V4327 Sgr] AND Outburst of 0409-71 VW Hydri

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
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AAVSO ALERT NOTICE 177 (September 17, 1993)

1806-29 NOVA SAGITTARII 1993 [V4327 SGR]

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.

Clear skies and good observing!


Director

files: Nova Sgr 1993 'b' scale chart; VZ Sgr RASNZ chart (use for Nova Sgr 1993)

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