Alert Notice 190: 1753-25 Var Sgr - New variable in Sgr AND FN Sgr - chart correction [V4683 Sgr]
AAVSO ALERT NOTICE 190 (August 12, 1994)
1753-25 VAR SGR - NEW VARIABLE IN SAGITTARIUS [V4683 SGR]
We have been informed by H. Satoh, National Astronomical Observatory, Japan,
and by the Central Bureau of Astronomical Telegrams (IAU Circular 6051) of the
discovery of a new variable star by Yukio Sakurai, Mito, Japan, on Aug 8.548 UT
at photographic magnitude 11.4, using Fuji SG400 film.
The 1950 position of Var Sgr is
R.A. = 17h 56m 35.54s Decl. = -25 degrees 13' 15.7"
The object has been confirmed as a Mira or symbiotic star undergoing an
outburst, according to spectroscopic observations made by T. Beers, Michigan
State University, W. Brandner and T. Lehmann, European Southern Observatory,
and H. Duerbeck, Astronomical Institute Munster, on Aug 10.084 UT with the ESO
1.52-meter telescope. Additional spectroscopic observations by M. Della Valle,
Universite di Padova, and A. Smette, Groningen, on Aug 10.0 with the La Silla
3.6-meter telescope (+ EFOSC) yield an Me spectrum for this object.
Photographic surveys examined by Della Valle and Smette show the following
magnitudes: July 1950, B = ~19, Palomar; May 1976, B = 14-15, ESO; June 1977,
R = ~12, Palomar.
Recent photographic observations of Var Sgr by Sakurai include: May 20 UT,
<12.5; June 17, <11.5; July 3, <11:; 28.520, 11.4; Aug 8.548, 11.4. Beers,
et al. observed Var Sgr on Aug 10.161 UT at 12.41 V PEP.
Enclosed is a "d" scale AAVSO chart of Var Sgr prepared by C. Scovil. Please
use it to observe this object and report your observations to AAVSO
Headquarters, indicating which comparison stars you used in making your
estimates. The answering machine at Headquarters, with our charge free number
(1-800-642-3883), is on nights and weekends for your convenience.
Congratulations to Y. Sakurai!
Chart links are obsolete; 01/2014 create charts using VSP at http://www.aavso.org/vsp
1848-19 FN SAGITTARII - CHART CORRECTION
Our attention was drawn by Drs. Arlo Landolt and Bruce Sumner to an error in
the identification of FN Sgr on the "d" chart issued with AAVSO Alert Notice
183. On that chart, FN Sgr is in fact the star labeled 130 to the West of
Enclosed is a revised chart with FN Sgr correctly identified. A star to the
West of FN Sgr, left off the earlier version of the chart, has also been
added. We thank our observers for their attention and apologize for the error.
Many thanks for your efforts and your valuable astronomical contributions.
Janet A. Mattei
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