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Alert Notice 547: Nova Sgr 2016 No. 2 = ASASSN-16ig = TCP J18010780-2631434 [V5853 Sgr]

August 11, 2016

Event: Nova in Sagittarius  [V5853 Sgr]

Discovered by:  
- Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan) (CBET 4295);
- All Sky Automated Survey for SuperNovae (ASAS-SN) (K. Z. Stanek et al., ATel #9343)

Discovery magnitude:
- Nishiyama and Kabashima - 10.7 unfiltered CCD (2 frames using a 135-mm f/4 camera lens (+FLI 09000 camera))
- ASAS-SN - V~13.3

Discovery date:
- Nishiyama and Kabashima - 2016 Aug. 8.53233 UT
- ASAS-SN - 2016 Aug. 6.96 UT
 
Coordinates (2000.0): R.A. 18 01 07.75  Dec. -26 31 44.8  (from VSX)

Spectra: Spectroscopy indicating that ASASSN-16ig is a Fe-II type classical nova were obtained by A. Arai (Kyoto Sangyo University) and Paulo Cacella (DogsHeaven Observatory, Brasilia, Brazil) (ATel #9359), and by M. Fujii (Okayama, Japan, via H. Maehara, CBET 4295), whose spectrum is at http://otobs.org/FBO/fko/nova/asassn-16ig_20160808.png.

Observing recommendations: Observations of all types (visual, CCD, DSLR, spectroscopy) and all bands as instrumentation permits are strongly encouraged as the nova evolves.

Observations reported to the AAVSO:
2016 Aug. 02.535 UT, <12.9 unfiltered CCD (Nishiyama and Kabashima, via CBET 4295);
04.97, <17.74 V (ASAS-SN, quad 14-cm "Cassius" telescope, CTIO, Chile, via ATel #9343);
05.97, <17.36 V (ASAS-SN);
06.96, 13.3 V +/-0.02 (ASAS-SN, discovery image);
08.17, 12.9 V +/-0.02(ASAS-SN);
08.149, 12.95 V (S. Kiyota, Chiba, Japan, remotely with iTelescope 43-cm telescope, New Mexico, via H. Maehara, CBET 4295);
08.151, 11.70 Rc (Kiyota);
08.153, 10.54 Ic (Kiyota);
08.155, 14.79 B (Kiyota);
08.409, 12.80 V (Kiyota);
08.411, 11.53 Rc (Kiyota);
08.414, 10.43 Ic (Kiyota);
08.416, 14.99 B (Kiyota);
08.472, 12.2 unfiltered CCD (M. Yamamoto, Okazaki, Japan, via S. Nakano, CBET 4295);
08.503, 11.8 unfiltered CCD (A. Takao, Fukuoka, Japan, via H. Maehara, CBET 4295);
08.53233, 10.7 unfiltered CCD (Nishiyama and Kabashima, discovery image);
08.554, 11.6 unfiltered CCD (Takao);
08.556, <11.9 unfiltered CCD (Nishiyama and Kabashima);
08.570, 11.5 unfiltered CCD (Takao);
08.595, 11.5 unfiltered CCD (Takao);
09.477, 11.2 unfiltered CCD (Yamamoto);
09.491, 9.57 Ic (Maehara, via CBET 4295);
09.491, 12.02 V (Maehara);
09.598, 11.81 V (H. Itoh, Tokyo, Japan, via H. Maehara, CBET 4295);
09.599, 9.20 Ic (Itoh);
09.599, 10.58 Rc (Itoh);
09.603, 14.30 B (Itoh);
09.491, 9.57 Ic (Maehara);
09.491, 12.02 V (Maehara);
10.486, 9.11 Ic (Maehara);
10.486, 11.49 V (Maehara);
11.533, 9.25 Ic (Maehara);
11.533, 11.86 V (Maehara);

Charts: Charts for Nova Sgr 2016 No. 2 may be created using the AAVSO Variable Star Plotter (VSP). Be sure to include the spaces in the name as shown.

Submit observations: Please submit observations to the AAVSO International Database using the name NOVA SGR 2016 NO. 2. Be sure to include spaces in name as shown.

Notes:
a. Announced in IAU Central Bureau for Astronomical Telegrams Central Bureau Electronic Telegram 4295 (Daniel W. E. Green, ed.). Designated TCP J18010780-2631434 when when posted to the IAU CBAT Transient Object Confirmation Page (TOCP) at http://www.cbat.eps.harvard.edu/unconf/tocp.html. Most of the information in this Alert Notice is taken from IAU CBET 4295 or ATel #9343 and #9359.

b. Nishiyama and Kabashima confirmed their discovery on five 5-s unfiltered CCD frames taken around 2016 Aug 08.5323 UT.

c. Nishiyama and Kabashima report that the nearest star in USNO B1.0 has position end figures 07.74s, 45.0", distance 1.8", magnitudes R1=20.71, I=18.58.

d. Position end figures:
- ASAS-SN (discovery image), 2016 Aug. 6.96 UT, 07.735s, 42.01"
-  M. Yamamoto (Okazaki, Japan, via CBET 4295), 2016 Aug. 8.472 UT, 07s.7, 47" (+/- 5")
- Nishiyama and Kabashima (discovery image), 2016 Aug. 8.532 UT, 07s.80s, 43.4"

Congratulations to K. Stanek and colleagues at ASAS-SN and to Koichi Nishiyama and Fujio Kabashima on their discoveries!

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.

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