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Alert Notice 683: Nova in Scutum = V659 Sct (N Sct 2019 = ASASSN-19aad, TCP J18395972-102541)

November 1, 2019

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
 - Time Sensitive Alerts:
https://www.aavso.org/asassn-19aad-tcp-j18395972-1025415-probable-nova-94-mag-scutum
 - Novae: https://www.aavso.org/asassn-19aad-tcp-j18395972-1025415-probable-nova-94-mag-scutum-0

Event:  Nova in Scutum: V659 Sct = N Sct 2019 (= ASASSN-19aad, TCP J18395972-102541)

Discovered independently by:
- Koichi Nishiyama (Kurume, Japan)
- Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan; reported to CBAT by S. Nakano, Sumoto, Japan)
- Shizuo Kaneko (Shizuoka-ken, Japan; reported by Nakano)
- All-Sky Automated Survey for Supernovae (ASAS-SN; reported via P. Schmeer, Saarbruecken-Bischmisheim, Germany)

Discovery magnitude:  
- Nishiyama: unfiltered magnitude 9.4
- Nishimura: unfiltered magnitude 9.8 (on three CCD frames with a Canon EOS 6D digital camera + 200-mm-f.l. f/3.2 lens)
- Kaneko: unfiltered magnitude 9.8 (with a Canon 6D digital camera + 200-mm-f.l. f/3 lens)
- ASAS-SN: mag 11.5 (Sloan g filter)

Discovery date:
- Nishiyama: 2019 October 29.397 UT
- Nishimura: 2019 October 29.421 UT
- Kaneko: 2019 October 29.462 UT
- ASAS-SN: 2019 October 29.05 UT

Coordinates (2000.0): R.A. 18 39 59.70   Decl. -10 25 41.5  (from VSX)

Spectra: Spectroscopy obtained by S. C. Williams et al. (ATel #13241) on 2019 October 29.81 UT with the 2-m Liverpool Telescope at the Observatorio del Roque de Los Muchachos, La Palma, indicates that the object is a Galactic nova in the early stages of eruption.

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 Oct. 28.064 UT, [17.1 CCD (ASAS-SN, via CBET 4690);
29.453, 9.4 CCD (A. Takao, Kitakyushu, Japan, via CBET 4690);
29.469, 9.0 CCD (K. Itagaki, Yamagata, Japan, via CBET 4690);
29.70210, 9.4 (F. Vohla, Altenburg, Germany);
29.71320, 9.228 TG +/-0.01 (D. Blane, Henley-on-Klip, S. Africa);
29.749, 9.3 (P. Schmeer, Saarbruecken-Bischmisheim, Germany);
29.75000, 9.34 (M. Deconinck, Artignosc sur Verdon, France);
29.78819, 9.32 (Deconinck);
29.82850, 9.3 (C. Labordena, Castellon, Spain);
30.00643, 7.601 R +/-0.018 (F.-J. Hambsch, Mol, Belgium);
30.00652, 7.647 R +/-0.018 (Hambsch);
30.00672, 9.843 B +/-0.020 (Hambsch);
30.00693, 9.835 B +/-0.019 (Hambsch);
30.00714, 8.589 V +/-0.013 (Hambsch);
30.00729, 8.605 V +/-0.014 (Hambsch);
30.00745, 6.722 I +/-0.038 (Hambsch);
30.00755, 6.757 I +/-0.034 (Hambsch);
30.07324, 8.657 V +/-0.003 (R. Fidrich, Budapest, Hungary);
30.07420, 8.674 V +/-0.003 (Fidrich);
30.425, 8.3 CCD (Takao, via CBET 4690);
30.72410, 8.554 TG +/-0.006 (Blane);
30.72430, 8.9 (Vohla);
30.74167, 8.5 (Deconinck);
30.74306, 8.6 (Deconinck);
30.77710, 8.5 (Labordena);
31.07363, 8.384 V +/-0.005 (F. Romanov, Yuzhno-Morskoy, Nakhodka, Russia);
31.07426, 8.421 V +/-0.05 (Romanov);
31.07515, 8.412 V +/-0.05 (Romanov);
31.07604, 9.914 B +/-0.06 (Romanov);
31.07665, 9.975 B +/-0.006 (Romanov);
31.07756, 9.983 B +/-0.001 (Romanov);
31.08307, 8.359 V +/-0.003 (Fidrich);
31.08359, 8.378 V +/-0.003 (Fidrich);
31.08420, 9.968 B +/-0.005 (Fidrich);
31.08490, 9.944 B +/-0.005 (Fidrich);
31.11597, 8.5 (C. Hergenrother, Tucson, AZ);
31.44479, 8.742 TG +/-0.08 (Romanov);
31.44501, 8.798 TG +/-0.12 (Romanov);
31.71180, 9.0 (W. Kriebel, Schierling/Walkenstetten, Germany);
31.71780, 8.972 TG +/-0.05 (Blane);
31.73958, 9.1 (A. Kammerer, Karlsruhe, Germany);
31.74281, 8.792 V +/-0.009 (M. Morales Aimar, Sencelles, Spain);
31.74670, 8.9749 TG +/-0.04 (Blane);
31.95278, 8.9 (C. Adib, Porto Alegre, Brazil);

Charts: Charts with comparison stars for V659 Sct may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations to the AAVSO International Database using the name V659 SCT.

Notes:
a. Designated TCP J18395972-102541 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP). Most information in this Alert Notice is taken from IAU CBAT CBET 4690 (D. W. E. Green, ed.).

b. P. Schmeer reports that the Pan-STARRS1 source PSO J183959.711-102541.689 is a possible progenitor (magnitudes i = 20.8, z = 20.0; position end figures 59.71s, 41.7"); it is 0.2" from the position reported by Itagaki.

c. N. Samus reports the GCVS name V659 Sct has been assigned to N Sct 2019.

d. Position end figures
- ASAS-SN (2019 Oct. 29.05 UT): 59.82s, 41.9"
- Nishiyama (2019 Oct. 29.397 UT): 59.72s, 41.5"
- Nishimura (2019 Oct. 29.421 UT): 59.64s, 42.4"
- Kaneko (2019 Oct. 29.462 UT): 59.86s, 40.8"
- Takao (2019 Oct. 29.453 UT):59.54s, 42.2"
- Itagaki (2019 Oct. 29.469 UT): 59.70s, 41.5"

e. Images
- K. Itagaki (2019 Oct. 29.469 UT): http://k-itagaki.jp/images/PN-sct.jpg

Congratulations to Koichi Nishiyama, Hideo Nishimura, Shizuo Kaneko, and the ASAS-SN team on their independent discoveries!

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

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