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Alert Notice 550: Nova Sco 2016 No. 2 = PNV J17225112-3158349 = ASASSN-16kd [V1656 Sco]

September 9, 2016:

Event: Nova in Scorpius  [V1656 Sco]

Discovered by:  
- Shigehisa Fujikawa (Kan'onji, Kagawa, Japan; reported to CBAT via M. Soma (National Astronomical Observatory of Japan, Mitaka, Tokyo))
- All Sky Automated Survey for SuperNovae (ASAS-SN) (K. Z. Stanek et al., ATel #9469, published September 7; reported to CBAT via L. Chomiuk (Michigan State University))

Discovery magnitude:
- Fujikawa - 11.6 unfiltered CCD, using a 120-mm-f.l. f/3.5 camera lens
- ASAS-SN - 12.13 V, using ASAS-SN robotic 14-cm telescopes

Discovery date:
- Fujikawa - 2016 September 06.481 UT
- ASAS-SN - 2016 September 06.00 UT
Coordinates (2000.0): R.A. 17 22 51.46  Dec. -31 58 37.1  (from VSX)

Spectra: Spectroscopy indicating that Nova Sco 2016 No. 2 is a highly reddened classical Fe II-type nova was obtained by A. Arai (Koyama Astronomical Observatory, Kyoto Sangyo U.) and S. Honda (Nishi-Harima Astronomical Observatory (NHAO), U. Hyogo) on 2016 Sep. 7.43 UT at NHAO (CBET 4320); by T. Bohlsen (ARAS Group, Armidale, NSW, Australia) 2016 Sep. 8.41725-8.54828 UT at Armidale (ATel #9477); by D. Bersier (Liverpool JMU) et al. on Sep. 8 UT at La Silla (ATel #9478); and by J. Prieto (UDP/MAS) et al. on Sep. 8 UT at Las Campanas (ATel #9479).

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 Sep. 02.04 UT, <16.96 (ASAS-SN, via ATel #9469);
03.0, <17.5 (ASAS-SN, via CBET 4320);  
05, <12.9 unfiltered CCD (S. Fujikawa, Kan'onji, Kagawa, Japan);
06.00, 12.13 V =/-0.01 (ASAS-SN, discovery image);
06.481, 11.6 unfiltered CCD (Fujikawa, discovery image);
07.6, 11.4 V +/-0.01 (ASAS-SN);
07.93750, 11.8 (A. Amorim, Florianopolis, Brazil);
08.04167, 11.9 (L. Camargo da Silva, Brazil);
08.0623, 11.79 V (S. Kiyota, Kamagaya, Japan, remotely using 0.61-m f/6.5 CDK astrograph + FLI PL09000 CCD at iTelescope, Sierra Remote Observatory, Auberry, CA; via CBET 4320);
08.0623, 9.33 Ic (Kiyota);
08.91667, 11.9 (Amorim);
09.04167, <11.6 (L. Shotter, Uniontown, PA);

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

a. Announced in IAU Central Bureau for Astronomical Telegrams Central Bureau Electronic Telegram 4319 (Daniel W. E. Green, ed.), corrected version in CBET 4320 (Daniel W. E. Green, ed.). Designated PNV J17225112-3158349 when when posted to the IAU CBAT Transient Object Confirmation Page (TOCP) at Most of the information in this Alert Notice is taken from IAU CBET 4320 or ATel #9469 (, #9477, #9478, #9479, and #9480.

b. Position end figures:
- Fujikawa - 2016 Sep. 6.481 UT (discovery image), 51.12s, 34.9"
- ASAS-SN - 2016 Sep. 6.00 UT (discovery image), 51.43s, 36.3"

c. R. Saito et al. (ATel #9480) report the progenitor likely to be located at position end figures 51.465s, 37.08", with magnitudes Z =19.41+/-0.19, Y =18.67+/-0.17, J =17.69+/-0.15, H =16.85+/-0.17, and Ks=16.53+/-0.21.

Congratulations to Shigehisa Fujikawa and to K. Stanek and colleagues at ASAS-SN on their discoveries!

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


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