July 20, 2012
Nova Sagittarii 2012 No. 5 = PSN J18193700-1907400 [V5593 Sgr]
Discovered by: Tadashi Kojima (Tsumagoi, Agatsuma-gun, Gunma-ken, Japan) (reported by S. Nakano (Sumoto, Japan)
Discovery Magnitude: mag 12.6 on two frames using a Canon EOS 40D camera (+ 150-mm f/2.8 lens)
Discovery date: 2012 July 16.512 UT
Coordinates: R.A. 18 19 37.0 Decl. -19 07 40 (2000.0)
Spectra: Spectra by Kazuyoshi Imamura and Minako Ogi (Okayama University of Science) on 2012 July 18.529 UT, and by M. Fujii (Kurashiki, Okayama, Japan) on July 18.572 UT (reported by Kazuya Ayani, Bisei Astronomical Observatory) indicate Nova Sgr 2012 No. 5 to be a classical nova and a Fe II-type nova, respectively. Details regarding these spectra reports and image URLs are in CBET 3182. In CBET 3184, spectra by U. Munari and P. Ochner (Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova) and A. Maitan, S. Tomaselli, and S. Dallaporta ("Asiago Novae and Symbiotic Stars" collaboration) on 2012 July 18.88 confirm it as a Fe II-type nova close to maximum brightness and as being affected by large interstellar reddening. Spectra by Terry Bohlsen (Armidale, NSW, Australia) on July 19 confirm reddening.
Observations reported to the AAVSO:
1991 Aug. 30 UT, <19 (Toru Yusa, Osaki, Japan; red Digitized Sky Survey plate, via CBET 3182);
2012 Jun. 27.629, <13.5 (Kojima, via CBET 3182);
Jul. 20.2812, 13.212 B +/-0.044 (C. Hergenrother, Tucson, AZ);
20.2821, 9.152 I +/-0.048 (Hergenrother);
20.2831, 10.292 R +/-0.034 (Hergenrother);
20.2840, 11.509 V +/-0.031 (Hergenrother);
Charts: Charts for N Sgr 2012 No. 5 may be created using the AAVSO Variable Star Plotter (VSP) at http://www.aavso.org/vsp.
Please submit observations to the AAVSO International Database using the name "N SGR 2012 NO. 5" until an GCVS name is assigned and announced.
a. Announced on IAU CBAT Central Bureau Electronic Telegram 3182 (Daniel W. E. Green, ed.) at http://www.cbat.eps.harvard.edu/iau/cbet/003100/CBET003182.txt and followed up on CBET 3184 (Green) at http://www.cbat.eps.harvard.edu/iau/cbet/003100/CBET003184.txt. All information in this Alert Notice except for observations submitted to the AAVSO come from CBETs 3182 and 3184.
b. Nova Sgr 2012 No. 5 designated PSN J18193700-1907400 when it was posted on the CBAT TOCP webpage.
c. Nothing is seen down to magnitude 13.5 on Kojima's patrol frames from 2011 Apr. 9.746 UT, July 5.514, Sept. 23.427, 2012 Mar. 25.789, Apr. 14.718, May 23.687, and June 22.547 (limiting mag 13.5).
d. CCD photometry by U. Munari and P. Ochner for 2012 July 18.92 UT: V = 12.28, B-V = +1.77, V-R_c = +1.13, V-I_c = +2.27 (CBET 3184).
e. Additional magnitudes, end position figures, and image URLs are available on CBET 3182 and CBET 3184.
Congratulations to Tadashi Kojima on his discovery!
This AAVSO Alert Notice was prepared by Elizabeth O. Waagen.
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