July 3, 2012:
Event: Nova Sagittarii 2012 No. 3 = PNV J17522579-2126215 [V5591 Sgr]
Discovered independently by:
- Koichi Itagaki (Yamagata, Japan, reported by Hitoshi Yamaoka, Kyushu University)
- Yukio Sakurai (Mito, Ibaraki-ken, Japan)
Discovery Magnitude:
- Itagaki: magnitude 10.3 on an unfiltered CCD image taken with a 0.21-m reflector
- Sakurai: magnitude 9.9 on four 20-s frames taken with a Fuji FinePix S2 Digital Camera + Nikon 180-mm f/2.8 lens
Discovery date:
- Itagaki: 2012 June 26.5494 UT
- Sakurai: 2012 June 26.540 UT
Coordinates:
- Itagaki: R.A. 17 52 25.79 Dec. -21 26 21.5 (2000.0)
- Sakurai: R.A. 17 52 25.59 Dec. -21 26 22.9 (2000.0), measured by S. Nakano, Sumoto, Japan, +/- 5" and limiting magnitude ~11.5;
Spectra: Spectra by L. Kiss and K. Sarneczky (Konkoly Observatory, Hungary) and J. Kovacs and T. Borkovits (ELTE Gothard Observatory, Hungary); Kazuyoshi Imamura (Okayama University of Science, Japan); Hiroyuki Maehara (Kwasan Observatory, Kyoto University, Japan); Christian Buil (Castanet Observatory, France); and by Ulisse Munari (Istituto Nazionale di Astrofisica, Padova Astronomical Observatory, Italy) confirm the object as a nova. The spectra by Munari on June 28.95 UT indicate Nova Sgr 2012 No. 3 is of the He/N type. Details regarding these spectra reports and image URLs are in CBET 3156.
Observations reported to the AAVSO: To date, 412 visual and BVRI observations of N Sgr 2012 No. 3 have been submitted to the AAVSO International Database:
2012 Jun 21.985 UT, <12.0 (H. Mikuz, Crni Vrh Observatory; 120-mmf/4 camera lens + CCD; object near edge of field, via CBET 3156);
22.988, <12.0 (Mikuz, via CBET 3156);
24.050, <12.0 (Mikuz, via CBET 3156);
25.666, <16.0 (Itagaki, via CBET 3156);
26.640, 10.0 (Itagaki, via CBET 3156);
26.9264, 9.6 (A. Amorim, Florianopolis, Brazil);
27.3101, 9.719 V +/-0.026 (C. Hergenrother, Tucson, AZ);
27.3129, 11.273 B +/-0.060 (Hergenrother);
27.3138, 8.767 R +/-0.030 (Hergenrother);
27.4867, 10.029 V +/-0.006 (A. Henden, Cambridge, MA; AAVSOnet BSM telescope, Astrokolkhoz Observatory, Cloudcroft, NM);
27.4867, 11.628 B +/-0.014 (Henden; AAVSONET BSM);
27.4867, 7.775 I +/-0.011 (Henden; AAVSONET BSM);
27.4867, 8.824 R +/-0.009 (Henden; AAVSONET BSM);
27.9264, 11.2 (Amorim):
28.1014, 10.9 (L. Shotter (Uniontown, PA);
28.1125, 11.0 (J. Bortle (Stormville, NY);
28.1750, 11.1 (Bortle);
28.1982, 10.805 V +/-XXX (Henden; AAVSONET BSM);
28.1982, 12.283 B +/-XXX (Henden; AAVSONET BSM);
28.1982, 8.360 I +/-0.023 (Henden; AAVSONET BSM);
28.1982, 9.423 R +/-0.021 (Henden; AAVSONET BSM);
28.2207-.3074, 9.407-9.440 R +/-0.003 (S. Padovan, Foixa, Spain; 92 R obs)
28.3075, 10.927 V +/-0.070 (Hergenrother);
28.3083, 12.248 B +/-0.085 (Hergenrother);
28.3083, 9.458 R +/-0.003 (Padovan);
28.3092, 9.445 R +/-0.003 (Padovan);
28.3099, 10.970 V +/-0.039 (K. Paxson, Spring, TX; Sierra Stars 24")
28.3101, 9.432 R +/-0.003 (Padovan);
28.3107, 9.485 R +/-0.026 (Hergenrother);
28.3109-.3586, 9.457-9.445 R +/-0.003 (Padovan; 56 R obs);
28.3864-.6154, 11.0951-11.2819 V +/-0.0031-0.0041 (P. Starr, Coonabarabran, NSW, Australia; 76 V obs);
28.8167, 11.232 V +/-0.01 (A. Sonka, Bucharest, Romania);
28.9278, 11.3 (Amorim);
29.2567-.2985, 11.400-11.437 V +/- 0.011-0.012 (Padovan; 23 V obs);
29.3046, 11.432 V +/-0.019 (Hergenrother);
29.3074, 12.722 B +/-0.049 (Hergenrother);
29.3083, 9.839 R +/-0.013 (Hergenrother);
29.3092, 11.440 V +/-0.026 (Paxson; Sierra Stars 24");
29.3550-.3725, 11.6096-11.6280, V +/-0.0022-0.0020 (Padovan; 21 V obs);
29.8721, 11.807 V +/-0.01 (Sonka);
30.3009, 11.834 V +/-0.016 (Hergenrother);
30.3048, 10.148 R +/-0.014 (Hergenrother);
30.3946, 11.839 V +/-0.012 (Paxson; Sierra Stars 24");
30.8658, 12.048 V +/-0.01 (Sonka);
30.9160, <11.4 (Amorim);
Jul 01.2527, 10.297 R +/-0.007 (Padovan);
01.2561, 12.071 V +/-0.030 (Padovan);
02.2508-.2752, 12.270-12.363 V +/-0.027-0.026 (Padovan; 8 R obs);
02.2518-.2762, 10.579-10.559 R +/-0.009 (Padovan; 8 V obs);
03.2578, 12.397 V +/-0.061 (Padovan);
03.2632, 12.442 V +/-0.061 (Padovan);
03.2681, 12.298 V +/-0.059 (Padovan);
03.2730, 12.432 V +/-0.066 (Padovan);
Charts: Charts for N Sgr 2012 No. 3 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. 3" until a GCVS name is assigned and announced.
Notes:
a. Announced on IAU CBAT Central Bureau Electronic Telegram 3156 (Daniel W. E. Green, ed.).
b. Confirmed by Itagaki at magnitude ~10.2 on unfiltered image taken 2012 June 26.565; his image of the variable posted at: http://www.k-itagaki.jp/images/pnv.jpg.
c. Nova Sgr 2012 No. 3 designated PSN J17522579-2126215 when it was posted on the CBAT TOCP webpage.
d. C. Jacques and E. Pimentel note that no progenitor star could be identified on a Palomar Sky Survey plate from Sept. 1950.
e. Multiple additional magnitudes, end position figures, and image URLs are available on CBET 3156.
Congratulations to the Koichi Itagaki on his latest discovery!
This AAVSO Alert Notice was prepared by Elizabeth O. Waagen.
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