Event: Nova in Sagittarius [subsequently named V5581 Sgr]
Discovered By: K. Nishiyama (Kurume, Fukuoka-ken, Japan) and F. Kabashima (Miyaki-cho, Saga-ken, Japan)
Discovery Date: 2009 April 21.711 UTC (JD 2454943.211)
Discovery Magnitude: m=11.7 (unfiltered)
Position: RA = 17h 44m 08.44s , Dec = -26d 05m 48.7s (from K. Kinugasa, S. Honda, and O. Hashimoto, Gunma Astronomical Obs.)
Charts: Finder charts for this object may be plotted by entering the coordinates above into VSP: http://www.aavso.org/vsp 
Notes: This object was announced as Nova Sagittarius 2009 in IAU Circular Number 9041 (Daniel W.E. Green, editor). Spectroscopy by Kinugasa et al. indicates a classical nova in the decline phase. This nova apparently reached a maximum of m ~ 11.7 (unfiltered) on or about 2009 April 21.711. The nova was originally reported as a brightening of the USNO-B1.0 star 0639-0570762, but further astrometry suggests the progenitor is approximately 1.8 arcseconds away, and is thus not the USNO-B1.0 object; the coordinates listed above are the revised coordinates.
This object has been assigned the name "VSX J174408.4-260548" with the AUID "000-BJP-183"; the name "Nova Sgr 2009" may also be used.
Congratulations to K. Nishiyama and F. Kabashima for their discovery.
Clear skies, and good observing,
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