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Alert Notice 722: N Sgr 2020 No. 4 = PNV J17545999-2122401 [V6593 Sgr]

The GCVS name V6593 Sgr has been assigned to this nova. Please use this name when submitting observations to the AAVSO International Database.  -  Elizabeth O. Waagen, 9 October 2020

October 5, 2020

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Time Sensitive Alerts: https://www.aavso.org/pnv-j17545999-2122401-possible-nova-mag-11-sagittarius-0
- Novae: https://www.aavso.org/pnv-j17545999-2122401-possible-nova-mag-11-sagittarius

Please subscribe to these threads if you are observing this nova so you can be updated as to its behavior and any observing campaigns on it. Join in the discussion or ask questions there!

Event: Nova in Sagittarius: N Sgr 2020 No. 4 = PNV J17545999-2122401 = BraTS-SON-T2-020 = AT 2020urz

Discovered by: C. Jacques et al., on behalf of the Brazilian Transient Search (BraTS; SONEAR Observatory, Oliveira, Brazil)

Discovery magnitude: unfiltered CCD 11.1

Discovery date: 2020 October 2.9799 UT

Coordinates (2000.0): R.A. 17 55 00.00   Decl. -21 22 40.1   (from VSX page for N Sgr 2020 No. 4)

Spectra: E. Aydi et al. (ATel #14064) report that a spectrum obtained by them on 2020 Oct. 4.75 UT using the High Resolution Spectrograph mounted on the 11-m Southern African Large Telescope as part of the SALT Large Science Program on Transients shows the object to be a classical nova before or at optical peak. They also report high levels of extinction in the direction of the nova.

Observing recommendations: Please observe the nova as it continues to evolve, with observations of all types (visual, CCD, DSLR, spectroscopy) and multiple bands as instrumentation permits.

Observations reported to the AAVSO:
2020 Oct. 2.9799 UT, 11.1 unfiltered CCD (C. Jacques et al., on behalf of the Brazilian Transient Search (discovery observation);
03.51264, 13.65 B (E. Pimental et al. on behalf of BraTS, using 0.50-m f/6.8 reflector + CCD at iTelescope.NET, SSO,Australia, via TOCP);
03.51264, 11.17 V (Pimental et al., via TOCP);
03.51264, 10.06 R (Pimental et al., via TOCP);
03.56736, 11.5 (A. Pearce, Nedlands, W. Australia);
03.70770, 11.200 TG +/-0.027 (D. Blane, Henley-on-Klip, S. Africa);
03.80280, 11.080 TG +/-0.022 (Blane);
03.93194, 11.0 (P. Reis Fernandes, Brasilia, Brazil);
03.98044, 9.561 I +/- 0.007 (J.-F. Hambsch, Mol, Belgium);
03.98071, 9.574 I +/- 0.007 (Hambsch);
03.98111, 10.842 V +/- 0.006 (Hambsch);
03.98150, 10.842 V +/- 0.006 (Hambsch);
03.98201, 12.262 B +/- 0.010 (Hambsch);
03.98256, 12.279 B +/- 0.010 (Hambsch);
04.41927, 12.243 B +/- 0.009 (Pearce);
04.42127, 10.722 V +/- 0.006 (Pearce);
04.42287, 8.759 I +/- 0.018 (Pearce);
04.47360, 10.6 (Pearce);
04.78333, 10.318 V +/-0.09 (V. Tuboly, Hungary);
04.91667, 10.8 (Reis Fernandes);
04.98054, 9.181 I +/- 0.010 (Hambsch);
04.98071, 9.183 I +/- 0.010 (Hambsch);
04.98100, 10.523 V +/- 0.008 (Hambsch);
04.98126, 10.510 V +/- 0.008 (Hambsch);
04.98171, 12.093 B +/- 0.010 (Hambsch);
04.98227, 12.075 B +/- 0.010 (Hambsch);
04.0983, 12.19 B (S. Kiyota, Kamagaya, Japan, using 0.43-m Astrograph + FLI PL6303E CCD (T21, iTelescope.NET) at Mayhill, NM, USA, via TOCP);
04.0983, 10.81 V (Kiyota, via TOCP);
04.0983, 9.97 Rc (Kiyota, via TOCP);
04.0983, 9.05 Ic (Kiyota, via TOCP);
05.02508, 10.709 TG +/- 0.007 (G. Williamson, UK);
05.38344, 10.480 V +/- 0.004 (Pearce);
05.38361, 12.198 B +/- 0.024 (Pearce);
05.38549, 10.486 V +/- 0.002 (Pearce);
05.38574, 10.418 V +/- 0.007 (Pearce);
05.38729, 8.718 I +/- 0.015 (Pearce);
05.38741, 8.546 I +/- 0.020 (Pearce);
05.49380, 10.5 (Pearce);
05.93056, 10.6 (Reis Fernandes);

Charts: Charts with comparison stars for N Sgr 2020 No. 4 may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations using the name N Sgr 2020 NO. 4. When a GCVS name is assigned to this nova, please use it when submitting observations.
 - Submit optical observations to the AAVSO International Database using WebObs (see below).
 - Submit spectra to the AAVSO Spectroscopy Database (AVSpec).

Notes:
a. Designated PNV J17545999-2122401 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP).

b. The discoverers report the object was not visible down to magnitude 17.1 on images obtained on 2020 Aug 16.0103 UT. (via CBAT TOCP)

c. S. Korotkiy (Ka-Dar Obs./Astrovert) et al. report nothing was visible to magnitude 13.0 on images obtained on 2020 Oct. 01.6901 UT at Ka-Dar Observatory's TAU Station/Astrovert, Nizhny Arkhyz, Russia. (via TOCP)

d. K. Sokolovsky (MSU/SAI MSU) et al. report a G=19.99 source Gaia DR2 4070608344975320960 is located 1.75 arcsec north-east of the reported transient position; the color is consistent with early M type. (via TOCP)

e. P. Schmeer (Saarbrücken-Bischmisheim, Germany) reports that Gaia DR2 4070608344910091776 ((Gmag. 18.59, BPmag. 19.43, RPmag. 17.32); Gaia DR2 position end figures 55m00.00s, 40.9" (epoch J2015.5, equinox J2000.0)),is only 0.8" south of the reported position of the nova. Other names include USNO-A2.0 0675-23344754 (Bmag. 19.6, Rmag. 17.9). (via TOCP)

f.  P. Schmeer reports ASAS-SN Sky Patrol observations: 2020 Sep. 29.111 UT, gmag. <15.5; Oct. 3.098 UT, gmag. 12.16; 3.099, 12.23; 3.101, 12.25. (via TOCP)

g. Position end figures:
- E. Pimental et al. (2020 Oct. 03.51264 UT, via TOCP): 55m 00.00s, 40.1"

Congratulations to C. Jacques et al. and BraTS on this discovery!

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