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Alert Notice 544: Nova Scorpii 2016 = PNV J17381927-3725077 [V1655 Sco]

June 13, 2016

Event: Nova in Scorpius

Discovered by: Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan) (reported by S. Nakano, Sumoto, Japan, via CBET 4285)

Discovery magnitude: 12.4 unfiltered CCD on three 10-s CCD frames, using a 200-mm-f.l. f/3.2 lens with a Canon EOS 5D digital camera

Discovery date: 2016 June 10.629 UT
 
Coordinates (2000.0): R.A. 17 38 19.31  Dec. -37 25 08.7   (from VSX)

Spectra (via CBET 4285): Spectroscopy obtained by K. Ayani (Bisei Astronomical Observatory, BAO) on 2016 Jun. 11.65 UT with the BAO 1.01-m telescope shows the star to be a nova in early stages. Ayani's spectrogram is posted at http://tinyurl.com/zqjkgjd.

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

Charts: Charts for Nova Sco 2016 may be created using the AAVSO Variable Star Plotter (VSP). Be sure to include spaces in the name as shown.

Observations reported to the AAVSO:
2016 May 14.712 UT, <12.5 CCD (Nishimura; from CBET 4285);
18.602 <12.9 CCD (Nishimura; from CBET 4285);
Jun. 5.532, <13.0 CCD (Nishimura; from CBET 4285);
5.582, <13 CCD (T. Kojima, Gunma-ken, Japan; 135-mm-f.l. lens + Canon EOS 6D digital camera; from CBET 4285);
9.596, 11.8 CCD (Kojima; pre-discovery image found on three frames; from CBET 4285);
11.255, 12.36 V (S. Kiyota, Kamagaya, Japan, remotely with a 0.50-m f/4.5 CDK astrograph near Mayhill, NM, USA; from CBET 4285);
11.255, 11.42 Rc (Kiyota; from CBET 4285);
11.255, 10.00 Ic (Kiyota; from CBET 4285);
11.25716, 11.461 CV +/-0.004 (HMB, F.-J. Hambsch, Mol Belgium; selected from 30 V obs Jun 11.25716-11.37339);
11.31119, 11.396 CV +/-0.004 (Hambsch, as above);
11.37339, 11.397 CV +/-0.005 CV (Hambsch, as above);
11.506, 10.4 CCD (K. Itagaki, Yamagata, Japan, 0.50-m f/7.7 reflector at Tochigi station; from CBET 4285);
11.513, 11.3 CCD (T. Noguchi, Katori, Chiba-ken, Japan, 0.23-m f/6.3 Schmidt-Cassegrain reflector; from CBET 4285);
11.612, 10.95 R (F. Watanabe and H. Naito, Nayoro Observatory, 0.4-m Meili telescope; from CBET 4285);
11.63091, 11.2697 CV +/-0.0238 (SPET, P. Starr, Coonabarabran, NSW, Australia, selected from 68 BVR obs 2016 Jun. 11.63091-11.78534);
11.63216, 13.2949 B +/-0.0130 (Starr, as above);
11.63332, 12.3166 V +/-0.0096 (Starr, as above);
11.67197, 12.2 (PAW, A. Plummer, Linden, NSW, Australia);
11.70072, 11.3373 CV +/-0.0122 (Starr, as above);
11.70197, 13.5749 B +/-0.0059 (Starr, as above);
11.70312, 12.3926 V +/-0.0025 (Starr, as above);
11.78296, 11.2928 CV +/-0.0083 (Starr, as above);
11.78421, 13.5515 B +/-0.0072 (Starr, as above);
11.78534, 12.3602 V +/-0.0028 (Starr, as above);
11.99389, 12.037 V +/-0.008 (NRNA, R. Nogues Naves, Cabrils, Spain);
12.16295, 12.380 V +/-0.009 (Hambsch);
12.18378, 12.348 V +/-0.008 (Hambsch);
12.19627, 12.362 V +/-0.008 (Hambsch);
12.42710, 9.16 I +/-0.03 (OCN, S. O'Connor, St. George, Bermuda);
12.42800, 10.61 R +/-0.02 (O'Connor);
12.42880, 12.22 V +/-0.02 (O'Connor);
12.42990, 13.65 B +/-0.03 (O'Connor);
12.47258, 12.125 V +/-0.004 (NLX, P. Nelson, Ellinbank, VIC, Australia, selected from 266 V obs Jun. 12.47258-12.78428 UT);
12.57032, 12.173 V +/-0.004 (Nelson, as above);
12.67065, 12.197 V +/-0.006 (Nelson, as above);
12.77050, 12.251 V +/-0.008 (Nelson, as above);
12.78428, 12.351 V +/-0.009 (Nelson, as above);
13.19722, <12.6 (SLH, L. Shotter, Uniontown, PA);
13.43300, 13.92 B +/-0.02 (O'Connor);
13.43510, 12.60 V +/-0.01 (O'Connor);

Submit observations: Please submit observations to the AAVSO International Database using the name NOVA SCO 2016. Be sure to include spaces in name as shown.

Notes:
done a. Announced in IAU Central Bureau for Astronomical Telegrams Central Bureau Electronic Telegram 4285 (Daniel W. E. Green, ed.). Designated PNV J17381927-3725077 when when posted to the IAU CBAT Transient Object Confirmation Page (TOCP). Most of the information in this Alert Notice is taken from IAU CBET 4285.

b. P. Schmeer (Bischmisheim, Germany) reports a star of red magnitude 17.1-17.4 in the USNO-B1.0 catalogue with position end figures 19.26s, 07.7". Schmeer also reports a potentially better progenitor candidate on the Digitized Sky Survey infrared image just southwest of the USNO-B1.0 star.

c. Position end figures (from CBET 4285):
 - T. Kojima (Tsumagoi, Gunma-ken, Japan, pre-discovery image on three frames), 2016 Jun. 9.596 UT, 18.8s, 10"
 - H. Nishimura (discovery), 2016 June 10.629 UT, 19.27s, 07.7"
 - K. Itagaki (Yamagata, Japan), 2016 Jun. 11.506 UT, 19.22s, 07.8"
 - T. Noguchi (Katori, Chiba-ken, Japan), 2016 Jun. 11.513 UT, 19.27s, 09.1"

d. Images posted (from CBET 4285):
 - S. Kiyota (Kamagaya, Japan), 2016 Jun. 11.255 UT:
http://meineko.sakura.ne.jp/ccd/PNV_J17381927-3725077.jpg
- T. Noguchi (Katori, Chiba-ken, Japan), 2016 Jun. 11.513 UT:
http://park8.wakwak.com/~ngc/images/PNVinSco_20160611.jpg

Congratulations to Hideo Nishimura on his latest discovery!

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

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