Alert Notice 420: Nova in Sagittarius (V5586 Sgr = Nova Sgr 2010 No. 2)
Event: Nova in Sagittarius (V5586 Sgr = Nova Sgr 2010 No. 2)
Discovered By: Koichi Nishiyama, Kurume, Japan, and Fujio Kabashima, Miyaki, Japan
Discovery Date: Apr. 23.782 UT using a 105-mm f/4 camera lens (+ SBIG STL6303E camera)
Discovery Magnitude: unfiltered CCD magnitude 11.2
Position: R.A = 17:53:02.99 +/- 0.01s, Decl. = -28:12:19.4 +/-0.1" (equinox 2000.0)
from five unfiltered CCD frames taken around Apr. 23.791
Spectra: Spectroscopic observations by L. A. Helton, T. Vonderharr, and C. E. Woodward, University of Minnesota; and G. J. Schwarz, American Astronomical Society, obtained at the Steward Observatory Bok 2.29-m telescope on Apr. 25.4 UT confirm that V5586 Sgr is a post-maximum classical nova. The emission lines are superimposed on a continuum that rises sharply to the red. The lack of any blue emission lines in the spectrum, along with the climbing red continuum, suggests that the nova is subjected to an exceptionally high degree of extinction. The red spectrum is similar to that of Nova Pup 1991 (V351 Pup; Williams et al. 1994, Ap.J. Suppl. 90, 297).
Reporting Observations: Please report all observations to the AAVSO as V5586 SGR. N Sgr 2010 No. 2 or its AUID 000-BJV-281 may also be used, but V5586 SGR is preferred.
Congratulations to Koichi Nishiyama and Fujio Kabashima on their latest discovery!
Good observing, Elizabeth O. Waagen Senior Technical Assistant
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