Apri1 3, 2011
Event: V5588 SGR = NOVA SAGITTARII 2011 No. 2 = PNV J18102135-2305306
Discovered by: Koichi Nishiyama, Kurume, Japan, and Fujio Kabashima, Miyaki, Japan
Discovery Date: ~ 2011 March 27.832 UT
Discovery Magnitude: unfiltered CCD magnitude mag 11.7 on two 40-s unfiltered CCD frames using a 105-mm f/4 camera lens (+ SBIG STL6303E camera)
Position: R.A. = 18:10:21.35, Decl. = -23:05:30.6 (equinox 2000.0)
Spectra: Low-resolution spectra obtained by A. Arai, M. Nagashima, T. Kajikawa, and C. Naka, Koyama Astronomical Observatory, Kyoto Sangyo University, on Mar. 28.725 UT under a hazy sky suggest that the object is a classical nova that is reddened by interstellar matter.
Charts: Finder charts for V5588 Sgr (Nova Sgr 2011 No. 2) may be plotted by entering the name or the coordinates above into VSP: http://www.aavso.org/vsp 
Reporting Observations: Please report all observations to the AAVSO as V5588 SGR.
Observations reported to the AAVSO International Database: Mar 29.4668 UT, 12.198 B +/-0.080, M. Simonsen, Imlay City, MI, using the AAVSONet telescope K35 (Krajci-35, Astrokolkhoz Observatory, Cloudcroft, NM); 29.4694, 11.100 V +/-0.014, Simonsen; 30.4604 UT, <12.0, S. Aguirre, Hermosillo, Mexico; 30.4653, 12.184 B +/-0.087, Simonsen; 30.4720, 11.098 V +/-0.015, Simonsen; Apr 01.4596, 13.557 B +/-0.555, Simonsen; 1.4663, 13.326 V +/-0.076, Simonsen; 2.4578, 13.900 B +/-0.094, Simonsen; 2.4624, 13.364 V +/-0.014, Simonsen; 2.4542, <11.8, Aguirre; 3.1662, 14.219 B +/-0.093 M. Bonnardeau, Chateau Bernard, France.
Notes: a. Initially announced in CBET 2679 (Daniel W. E. Green, ed.) and AAVSO Special Notice #237  (Waagen). Additional information published in IAU Circular 9203 (Green, ed.). Except for observations reported to the AAVSO, all information in this Alert Notice comes from the CBET and IAU Circular.
b. Nova confirmed by discoverers on five 3-s unfiltered CCD frames taken around 2011 March 27.854 UT using a Meade 200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera). Nothing is visible at this position on survey frames taken on March 17.814 and 26.837 down to magnitude 13.4 and 13.2, respectively.
c. H. Maehara, Kyoto University, reports that CCD images of the variable obtained with a 0.25-m telescope at Kwasan Observatory yield the following magnitudes: March 28.788, Ic = 10.17; 28.789, Rc = 11.40; 28.791, V = 12.86; 28.798, B = 14.47. S. Kiyota (Tsukuba,Japan) writes that images obtained remotely with a 31-cm reflector at the GRAS Observatory, Officer, Victoria, Australia, on March 28.670 yield magnitudes V = 12.81, Rc = 11.54, Ic = 10.38, B = 14.66, and position end figures 21.36s, 29.9" for the nova.
d. According to Green, the object was designated PNV J18102135-2305306 when posted on the Central Bureau's Transient Objects Confirmation Page (TOCP) webpage, and was designated Nova Sgr 2011 No. 2 based on spectroscopic reports.
e. E. Kazarovets, on behalf of the GCVS team, reports that the name V5588 Sgr has been assigned to this nova.
Congratulations to Koichi Nishiyama and Fujio Kabashima on their discovery!
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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