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Alert Notice 697: Nova in Sagittarius: V6566 Sgr = N Sgr 2020 = PNV J17561375-2942546

February 4, 2020

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
 - Time Sensitive Alerts: https://www.aavso.org/pnv-j17561375-2942546-possible-nova-115-mag-sagittarius
 - Novae: https://www.aavso.org/v6566-sgr-n-sgr-2020-pnv-j17561375-2942546

Event: Nova in Sagittarius: V6566 Sgr = N Sgr 2020 = PNV J17561375-2942546

Discovered independently by:
- Minoru Yamamoto (Okazaki, Aichi, Japan) (reported to CBAT by I. Endoh (NAO Japan))
- Yukio Sakurai (Mito, Ibaraki-ken, Japan) (reported to CBAT by S. Nakano (Sumoto, Japan))

Discovery magnitude:  
- Yamamoto: unfiltered CCD mag 11.5 (using a Canon 6D DSLR camera with a 180-mm f/3.5 lens)
- Sakurai: unfiltered CCD mag 10.5 (using a Nikon D7100 camera with a 180-mm f/2.8 lens)
 
Discovery date:
- Yamamoto: 2020 January 30.8568 UT
- Sakurai: 2020 January 31.841 UT

Coordinates (2000.0): R.A. 17 56 14.04   Decl. -29 42 58.2  (from VSX)

Spectra: Spectroscopy obtained by H. Akazawa (Funao, Kurashiki, Okayama, Japan) on 2020 Feb. 1.888 UT using a 0.35-m telescope (+ DSS-7 spectrograph + ST-402 camera) shows prominent H-alpha emission, characteristic of a nova.

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

Observations reported to the AAVSO:
2020 Jan. 30.8568 UT, 11.5 CCD (M. Yamamoto, discovery image, via CBET 4720);
31.839, 11.5 CCD (Yamamoto, confirming image, via CBET 4720);  
31.841, 10.5 CCD (Y. Sakurai, discovery image, via CBET 4720);
Feb. 01.39604, 11.182 V +/-0.013 (J. Hambsch, Mol, Belgium);
01.39631, 11.187 V +/-0.014 (Hambsch);
01.39658, 9.303 I +/-0.031 (Hambsch);
01.39680, 9.344 I +/-0.031 (Hambsch);
01.39719, 12.451 B +/-0.028 (Hambsch);
01.39758, 12.385 B +/-0.029 (Hambsch);
01.752, 12.20 B (S. Kiyota, Kamagaya, Japan, iTelescope 0.50-m f/4.5 astrograph, Siding Spring, NSW, via CBET 4720);
01.752, 11.03 V (Kiyota);
01.752, 10.11 Rc (Kiyota);
01.752, 9.30 Ic (Kiyota);
01.83540, 11.6 (A. Pearce, Nedlands, WA, Australia);
01.876, 10.5 (K. Itagaki, Yamagata, Japan, via CBET 4720);
02.32569, <11.1 (C. Adib, Porto Alegre, Brazil);
02.39672, 11.673 V +/-0.016 (Hambsch);
02.39699, 11.666 V +/-0.017 (Hambsch);
02.39727, 9.662 I +/-0.033 (Hambsch);
02.39748, 9.685 I +/-0.035 (Hambsch);
02.39787, 12.926 B +/-0.039 (Hambsch);
02.39826, 12.855 B +/-0.041 (Hambsch);
02.83470, 11.7 (Pearce);
03.39734, 11.578 V +/-0.015 (Hambsch);
03.39762, 11.575 V +/-0.015 (Hambsch);
03.39790, 9.696 I +/-0.031 (Hambsch);
03.39811, 9.750 I +/-0.029 (Hambsch);
03.39851, 12.853 B +/-0.035 (Hambsch);
03.39889, 12.773 B +/-0.036 (Hambsch);
04.39804, 11.387 V +/-0.014 (Hambsch);
04.39831, 11.416 V +/-0.014 (Hambsch);
04.39859, 9.557 I +/-0.035 (Hambsch);
04.39880, 9.496 I +/-0.040 (Hambsch);
04.39920, 12.648 B +/-0.032 (Hambsch);
04.39958, 12.611 B +/-0.032 (Hambsch);

Charts: A sequence for V6566 Sgr is being prepared by the AAVSO Sequence Team. Once it is available, charts with comparison stars for the nova may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations to the AAVSO International Database using the name V6566 SGR.

Notes:
a. Designated PNV J17561375-2942546 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP). Information in this Alert Notice is taken from IAU CBAT CBET 4720 (D. W. E. Green, ed.) except for observations not indicated as coming via CBET 4720.

b. E. Kazarovets reports that a red star (magnitudes B = 18.6, R = 16.6) is located at position end figures 13.781s, 57.68" (USNO-A2.0 0600-29573251).

c. E. Kazarovets reports the GCVS name V6566 Sgr has been assigned to N Sgr 2020.

d. Position end figures
- H. Kaneda (measured Yamamoto's image of 2020 January 30.8568 UT): 13.75s, 54.6"
- Sakurai (2020 Jan. 31.841 UT): 14.11s, 54.9"
- S. Kiyota (2020 Feb. 01.752 UT): 14.04s, 58.0"
- K. Itagaki (2020 Feb. 01.876 UT): 14.06s, 58.6"

e. Images
- S. Kiyota (2020 Feb. 01.752 UT): http://meineko.sakura.ne.jp/ccd/PNV_J17561375-2942546.jpg)
- K. Itagaki (2020 Feb. 01.876 UT): http://k-itagaki.jp/images/sgr-2020-1.jpg)

Congratulations to Minoru Yamamoto and Yukio Sakurai on their independent discoveries!

This Alert Notice was compiled by Elizabeth O. Waagen.
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