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Alert Notice 679: Nova in Scorpius: N Sco 2019 No. 2 = PNV J17370958-3510211

September 16, 2019

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
 - Time Sensitive Alerts: https://www.aavso.org/pnv-j17370958-3510211-possible-nova-110-mag-scorpius-0
 - Novae: https://www.aavso.org/pnv-j17370958-3510211-possible-nova-110-mag-scorpius

Event:  Nova in Scorpius: N Sco 2019 No. 2 = PNV J17370958-3510211

Discovered independently by:
Tadashi Kojima (Gunma-ken, Japan)
Koichi Itagaki (Yamagata, Japan)
Hideo Nishimura (Shizuoka-ken, Japan)
Minoru Yamamoto (Okazaki, Aichi, Japan)
Yuji Nakamura (Kameyama, Mie, Japan)

Discovery magnitude:
Kojima: 11.5 (unfiltered, using Canon EOS 6D + 200-mm f/3.2)
Itagaki: 11.0 (unfiltered, using 180-mm lens + CCD)
Nishimura: 10.9 (unfiltered, using Canon EOS 6D + 200-mm lens f/3.2)
Yamamoto: 10.5 (unfiltered, using a 180mm F3.5 lens)
Nakamura: 10.9 (unfiltered, using a 135mm F4 lens)

Discovery date:
Kojima: 2019 September 15.412 UT
Itagaki: 2019 Sep. 15.4247 UT
Nishimura: 2019 Sep. 15.442 UT
Yamamoto: 2019 Sep. 15.4237 UT (reported to NAOJ on Sep 15.488)
Nakamura: 2019 Sep. 15.4203 UT (reported to NAOJ on Sep 15.582)

Coordinates (2000.0): R.A. 17 37 09.53   Decl. -35 10 23.4  (from VSX)

Spectra: Spectroscopy obtained by J. Strader et al. (ATel #13112) on 2019 Sep. 16.01 UT using the Goodman Spectrograph on the SOAR telescope confirms that the object is a substantially reddened classical nova. They report that ASAS-SN imaging indicates the nova is still brightening.

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

Observations reported to the AAVSO:
2019 Sept 09.4251 UT, <13 unfiltered CCD (Y. Nakamura, Kameyama, Mie, Japan, via CBAT TOCP);
12.145, <15.8 g (ASAS-SN Sky Patrol, provided by P. Schmeer, Saarbrueken-Bischmisheim, Germany);
13.138, <14.6 g (ASAS-SN Sky Patrol, provided by Schmeer);
14.04265, 12.2 unfiltered (C. Jacques, L. Amaral, C. Colesanti, E. Pimentel, I. Mussi, J. Ribeiro, M. Domingues, P. Holvorcem, T. Napoleao on behalf of the Brazilian Transient Search (BraTS), SONEAR Observatory, Oliveira, Brazil, using an telephoto 200m f/1.8 + Canon 6D, via CBAT TOCP);
14.137, 13.4 g (ASAS-SN Sky Patrol, provided by Schmeer);
14.884, 13.1 g (ASAS-SN Sky Patrol, provided by Schmeer);
15.01775, 11.0 (Jacques et al., via CBAT TOCP);
15.412, 11.5 unfiltered CCD (T. Kojima, discovery image, via CBAT TOCP);
15.4203, 10.9 unfiltered CCD (Y. Nakamura, discovery image, via CBAT TOCP);
15.4237, 10.5 unfiltered CCD (M. Yamamoto, discovery image, via CBAT TOCP);
15.4247, 11.0 unfiltered CCD (K. Itagaki, discovery image, via CBAT TOCP);
15.44016, 10.3 unfiltered? CCD (Itagaki, via CBAT TOCP);
15.442, 10.9 unfiltered (H. Nishimura, discovery image, via CBAT TOCP);
15.451, 14.07 B (K. Yoshimoto, Yamaguchi, Japan, remotely, Siding Spring, NSW, Australia; via CBAT TOCP);
15.451, 11.75 V (K. Yoshimoto, via CBAT TOCP);
15.451, 8.91 Ic (K. Yoshimoto, via CBAT TOCP);
15.49306, 12.0 (A. Pearce, Nedlands, W. Australia);
15.50969, 11.8609 V +/-0.0042 (P. Starr, Coonabarabran, NSW, Australia);
15.51420, 13.8250 B +/-0.0346 (Starr);
15.51667, 12.0 (Pearce);
15.51946, 9.0780 I +/-0.0431 (Starr);
15.52218, 10.5719 R +/-0.0084 (Starr);
15.54050, 11.8592 V +/-0.0104 (Starr);
15.54176, 9.0385 I +/-0.0399 (Starr);
15.54322, 11.8339 V +/-0.0094 (Starr);
15.54446, 9.0272  I +/-0.0376 (Starr);
15.54593, 11.8359  V +/-0.0095 (Starr);
15.54718, 9.0174  I +/-0.0371 (Starr);
15.54865, 11.8376 V +/-0.0095 (Starr);
15.54990, 9.0383 I +/-0.0383 (Starr);
15.55138, 11.8301 V +/-0.0098 (Starr);
15.55260, 9.0208 I +/-0.0387 (Starr);
15.55411, 11.8355 V +/-0.0096 (Starr);
15.83140, 11.905 TG +/-0.03 (D. Blane, Henley-on-Klip, S. Africa);
16.36597, 12.5 (C. Wyatt, Walcha, NSW, Australia);
16.70890, 12.272 TG +/-0.03 (Blane);

Charts: Charts with comparison stars for N Sco 2019 No. 2 may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations to the AAVSO International Database using the name N SCO 2019 No. 2. When a GCVS name is announced in an IAU Circular or CBET, please use that name.

Notes:
a. Designated PNV J17370958-3510211 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP). Some information in this Alert Notice is taken from the TOCP page.
 
b. P. Schmeer (Saarbruecken-Bischmisheim, Germany) reports that the two Gaia sources that are closest to Itagaki's improved position (17 37 09.53 -35 10 23.4) are both 5" away (g magnitudes 20.5 and 20.6). The Vista variable VVV J173709.36-351023.01 is 2.1" to the west of thenova. No previous eruptions (or outbursts) were recorded by the ASAS-SN Sky Patrol since 2012 March 31/2016 March 9.

c. Position end figures
 - C. Jacques et al. (2019 Sep. 14.04265 UT, via CBAT TOCP): 09.63s, 20.0"
 - T. Kojima (2019 Sep. 15.412 UT, via CBAT TOCP): 09.45s, 21.4"
 - H. Nishimura (2019 Sep. 15.442 UT, via CBAT TOCP): 09.56s, 25.3"
 - K. Yoshimoto (2019 Sep. 15.451 UT, via CBAT TOCP): 09.53s, 23.3"
 - M. Yamamoto (2019 Sep. 15.4237 UT, via CBAT TOCP): 09.58s, 24.1"
 - Y. Nakamura (2019 Sep. 15.4203 UT, via CBAT TOCP): 09.5s, 25"

d. Images
 - K. Itagaki, Yamagata, Japan (2019 Sep. 15.440 UT, via CBAT TOCP): http://k-itagaki.jp/PN-Sco.jpg
 - K. Yoshimoto, Yamaguchi, Japan (2019 Sep. 15.451 UT, via CBAT TOCP): http://orange.zero.jp/k-yoshimoto/PNV_J17370958-3510211.jpg

Congratulations to Tadashi Kojima, Koichi Itagaki, Hideo Nishimura, Minoru Yamamoto, and Yuji Nakamura on their independent discoveries!

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