Alert Notice 409: V5584 Sgr = Nova Sagittarii 2009 Number 4

October 29, 2009


Event: Nova in Sagittarius (V5584 Sgr = N Sgr 2009 No. 4)

Discovered By: Koichi Nishiyama, Kurume, Fukuoka-ken, Japan, and F. Kabashima, Miyaki-cho, Saga-ken, Japan

Discovery Date: Oct. 26.439 UT (two frames from Oct. 26.439 and 26.440)

Discovery Magnitude: unfiltered CCD magnitude 9.3, using a 105-mm f/4 camera lens

Position: R.A. 18:31:32.79, Decl. -16:19:07.5 (equinox 2000.0) from the discoverers based on their five unfiltered CCD frames taken around Oct. 26.455 UT.

Spectra: The object was confirmed as a classical nova through spectra obtained by K. Kinugasa, S. Honda, O. Hashimoto, H. Taguchi, and H. Takahashi, Gunma Astronomical Observatory, Japan, on Oct. 27.4 UT; by H. Maehara, Kwasan Observatory, Kyoto University, Japan, on Oct. 27.42 UT; and (reported by Maehara) by M. Fujii, Okayama, Japan, on Oct. 27.43 UT. Additional information is available in IAU Circular 9089.

Observations Reported to the AAVSO: Oct. 27.4167 UT, 10.0 (green channel of DSLR image), R. Kaufman, Bright, Victoria, Australia; 27.7300, 9.9, R. Fidrich, Budapest, Hungary; 27.7396, 9.8, D. Vansteelant, Belgium; 27.9865, 9.78, G. Beltran, Cochabamba, Bolivia; 28.0646, 9.8, S. Aguirre, Hermosillo, Mexico; H. Maehara, Kwasan Observatory, Kyoto University (via IAU Circular 9089) - Oct. 27.460, 8.66 Ic; 27.461, 9.29 Rc; 27.461, 9.90 V; 27.463, 11.06 B.

Charts: Finder charts for V5584 may be plotted by entering the coordinates above into VSP at

Report Observations: V5584 Sgr has been added to VSX and been assigned the identifier VSX J183132.7-161907 and the AUID 000-BJQ-768. Please report observations to the AAVSO International Database as V5584 SGR.

a. The discoverers report nothing was visible on survey frames taken Oct. 20.449 UT (to magnitude 13.9) and 21.451 (to magnitude 13.4).

b. Following posting on the Central Bureau's unconfirmed-objects webpage, other observers reported CCD magnitudes and astrometry - Oct. 26.764, mag 9.3, position end figures 32.79s, 07.8" (P. Corelli, Pagnacco, Italy, 0.45-m reflector); Oct. 27.09, about 9.0, 32.81s, 07.5" (E. Guido and G. Sostero, remotely with a 0.25-m reflector at the GRAS Observatory near Mayhill, NM). Corelli adds that nothing was visible on a Palomar plate down to magnitude 21.0.

c. N Sgr 2009 No. 4 has been assigned the name V5584 Sgr by the GCVS team, according to N. Samus and E. V. Kazarovets.

d. N Sgr 2009 No. 4 was originally announced in CBET 1994 (Daniel W. E. Green, Ed.) and AAVSO Special Notice #173 (E. Waagen). Additional non-AAVSO information in this Alert Notice was announced in IAU CBET No. 1995 and IAU Circular 9089 (Daniel W. E. Green, Ed.).

Congratulations to Koichi Nishiyama and F. Kabashima on their discovery!

Good observing,
Elizabeth O. Waagen, AAVSO



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