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AAVSO Alert Notice 420: Nova in Sagittarius (V5586 Sgr = Nova Sgr 2010 No. 2) AAVSO HOME > publications > alert notice

AAVSO Alert Notice 420

Nova in Sagittarius (V5586 Sgr = Nova Sgr 2010 No. 2)
April 26, 2010

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).

Observations Reported to the AAVSO (via IAU Circular 9140): 
(via unfiltered CCD, and from Nishiyama and Kabashima, unless 
noted otherwise): 1996 Sept. 12, <17.5 (Digitized Sky Survey, 
red plate); 2010 Apr. 2.831, <12.9; 16.749, <13.1; 20.262, 
<11.0, W. Liller, Vina del Mar, Chile (Kodak TP film, orange 
filter, 85-mm camera lens); 24.660, 11.1, T. Yusa, Osaki, 
Japan; 24.673, 11.6, Nishiyama and Kabashima; 24.752, 
10.21 Ic, H. Maehara, Kwasan Observatory, Kyoto University; 
24.754, 12.47 Rc, Maehara; 24.755, 15.33 V, Maehara; 25.4, 
12.1, E. Guido and G. Sostero (remotely with a 0.25-m 
reflector from GRAS Observatory near Mayhill, NM).

Charts: Finder charts for V5586 Sgr may be plotted by entering 
the coordinates above into VSP: 
http://www.aavso.org/observing/charts/vsp/

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.

Notes:
a. A USNO-B1.0-catalogue star of red mag 17.4 has position 
end figures 03.11s, 19.0". T. Yusa, Osaki, Japan, reports 
position end figures 02.98s, 19.3" on an image taken April 
24.660 UT. E. Guido and G. Sostero report position end figures 
02.99s, 19.3" on CCD images obtained Apr. 25.4 UT remotely 
with a 0.25-m reflector from GRAS Observatory near Mayhill, 
NM. A comparison between their image and a Digitized Sky Survey 
1980cinfrared plate is posted at website URL 
http://bit.ly/bH6fps.

b. E. V. Kazarovets reports that the GCVS team has assigned 
Nova Sgr 2010 No. 2 the name V5586 SGR.

c. Initially announced in CBET 2261 (Daniel W. E. Green, ed.), 
with additional information in CBET 2264 (Daniel W. E. Green, 
ed.). The information in this Alert Notice is taken from the 
IAU CBETs and IAU Circular 9140 (Daniel W. E. Green, ed.).

Congratulations to Koichi Nishiyama and Fujio Kabashima on 
their latest discovery!

Good observing,

Elizabeth O. Waagen
Senior Technical Assistant


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