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Alert Notice 715: N Cas 2020 = TCP J00114297+6611190

August 13, 2020

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Time Sensitive Alerts: https://www.aavso.org/tcp-j001142976611190-galactic-classical-fe-ii-nova-13-mag-cassiopeia-0
- Novae: https://www.aavso.org/tcp-j001142976611190-galactic-classical-fe-ii-nova-13-mag-cassiopeia

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Event: Nova in Cassiopeia: N Cas 2020 = TCP J00114297+6611190

Discovered by: Stanislav Korotkiy (Ka-Dar Obs./Astrovert, Kuz'minskoye, Russian Fed.) and Kirill Sokolovsky (MSU/SAI MSU/ASC Lebedev) (via ATel #13903)

Discovery magnitude: unfiltered magnitude 12.9 (V zero-point) (using a 135-mm f/2.0 telephoto lens + SBIG ST-8300M CCD camera as part of the NMW survey)
 
Discovery date: 2020 July 27.9302 UT

Coordinates (2000.0): R.A. 00 11 42.96   Decl. +66 11 20.8   (from VSX page for N Cas 2020)

Spectra: K. Sokolvsky et al. (ATel #13903) report that spectroscopy obtained on 2020 Jul. 29.025 UT with the Sternberg Astronomical Institute telescope show the object to be an FeII type classical nova near optical peak.

A spectrum obtained by U. Munari et al. (ATel #13905) on 2020 Jul. 29.960 UT with the Asiago 1.22-m telescope shows significant changes from the one by Sokolovsky et al. 23 hours earlier and demonstrates significant interstellar extinction.
 
S. Shore et al. (ATel #13939) report that ongoing monitoring of the nova through 2020 Aug. 11.9 UT shows very substantial evolution of the spectrum since their first observations on Jul. 30.7 UT.

Observing recommendations: An AAVSO Alert Notice was not issued for this object at the time of discovery. However, the nova has continued to brighten and is being studied by the astronomical community, and ongoing optical coverage will be valuable. 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 (selected from over 760 in the AAVSO International Database):
2020 Jul. 26.10000 UT, <13.5 V (FRAM-ORM cameras, Observatorio del Roque de los Muchachos, La Palma, Spain (via Sokolovsky et al. ATel #13904);
26.10104, <12.7 R (FRAM-ORM);
27.23087, 13.15 V +/- 0.22 (FRAM-ORM);
27.23156, 12.47 R +/- 0.17 (FRAM-ORM);
27.9302, 12.9 unfiltered (V zero-point, S. Korotkiy and K. Sokolovsky, discovery observation, via ATel #13903);
28.22301, 13.74 V +/-0.30 (FRAM-ORM);
28.22370, 12.11 R +/-0.11 (FRAM-ORM);
28.457, 12.4 R (S. Kiyota, Kamagaya, Japan, remotely with T11, ITelescope.NET, Mayhill, NM, via CBAT TOCP);
28.79432, 15.164 B +/-0.035 (A. Novichonok, Kondopoga, Russian Fed.);
28.79444, 13.642 V +/-0.014 (Novichonok);
28.89500, 13.51 TG +/-0.05 (I. Sergey, Molodechno, Belarus);
28.91237, 15.11 B +/- 0.08 (FRAM-ORM);
28.91385, 13.68 V +/- 0.02 (FRAM-ORM);
28.91533, 12.39 R +/- 0.01 (FRAM-ORM);
29.80157, 15.34 B +/-0.045 (Novichonok);
29.80208, 13.931 V +/-0.021 (Novichonok);
29.89494, 13.740 CV +/-0.013 (R. Kneip, Contern, Luxembourg);
29.89722, 13.9 V (K. Wenzel, Grossostheim, Germany);
30.12280, 13.749 V +/-0.020 (J. DeYoung, Palmyra, VA);
30.12280, 13.760 R +/-0.030 (DeYoung);
30.12280, 15.053 B +/-0.039 (DeYoung);
30.83960, 13.8 (B. Bago, Piliscsaba, Hungary);
30.86756, 13.390 V +/-0.011 (M. Morales Aimar, Sencelles, Spain);
30.91459, 15.026 B +/-0.021 (D. Boyd, West Challow, UK);
30.91519, 13.391 V +/-0.011 (Boyd);
31.00420, 13.5 (E. Muyllaert, Oostende, Belgium);
31.05536, 13.422 TG +/-0.029 (R. Tyson, Glen Burnie, MD);
31.16443, 13.273 V +/-0.050 (G. Holmberg, Lund, Sweden);
31.16649, 13.526 TG +/-0.053 (J. Dos Santos, Buenos Aires, Argentina);
31.82324, 11.875 TR (P. Jordanov, Dimitrovgrad, Bulgaria);
31.82324, 12.994 TG (Jordanov);
31.82324, 14.431 TB (Jordanov);
31.85417, 12.95 CV +/-0.01 (Y. Solomonov, Moscow, Russian Fed.);
31.86260, 14.584 B +/-0.014 (T. Eenmae, Toravere, Estonia);
31.86470, 13.009 V +/-0.004 (Eenmae);
31.86596, 11.878 R +/-0.055 (Eenmae);
31.86688, 10.858 I +/-0.074 (Eenmae);
Aug. 01.18749, 10.739 I +/-0.026 (B. Vietje, South Ryegate, VT);
01.18814, 11.820 R +/-0.031 (Vietje);
01.18889, 14.436 B +/-0.012 (Vietje);
01.18971, 12.916 V +/-0.014 (Vietje);
01.85764, 12.81 TG +/-0.05 (Sergey);
02.42569, 13.1 (B. Cudnik, Houston, TX);
02.550, 11.80 unfiltered (R zero-point, Y. Sano, Nayoro Hokkaido, Japan), via CBAT TOCP);
02.83899, 13.150 TG +/-0.06 (Sergey);
02.98084, 12.441 V +/-0.010 (Boyd);
02.98446, 14.027 B +/-0.011 (Boyd);
03.12880, 12.680 TG +/-0.067 (Tyson);
03.86485, 12.049 V +/-0.010(Morales Aimar);
04.12874, 10.961 TR +/-0.107 (J. Backman, Lappeenranta, Finland);
04.12931, 12.086 TG +/-0.047 (Backman);
04.12987, 13.336 TB +/-0.023 (Backman);
04.98540, 11.9 (Muyllaert);
05.13225, 11.755 V +/-0.009 (E. Schwendeman, Fincastle, VA);
05.13402, 13.401 B +/-0.028 (Schwendeman);
05.13588, 9.675 I +/-0.018 (Schwendeman);
05.80131, 11.668 V +/-0.013 (Y. Yatsenkov, Novokuznetsk, Russian Fed.);
05.80639, 12.481 B +/-0.038 (Yatsenkov);
05.81118, 10.564 R +/-0.042 (Yatsenkov);
05.95700, 11.9 (G. Poyner, Birmingham, UK);
06.30700, 11.89 TG +/-0.08 (K. Sokolovsky, Moscow, Russian Fed.);
06.83150, 11.619 V +/-0.017 (M. Pyatnytskyy, Kyiv, Ukraine);
06.93819, 11.5 (H. De Angelis, Bromma, Sweden);
07.12847, 11.2 (W. Pittendreigh, Orlando, FL);
07.33200, 11.49 TG +/-0.06 (Sokolovsky);
07.84552, 11.394 V +/-0.006 (Morales Aimar);
07.94455, 11.500 CV +/-0.056 (Kneip);
08.31458, 11.8 (L. Shotter, Uniontown, PA);
08.80556, 11.30 TG +/-0.01 (Solomonov);
09.19345, 8.924 I +/-0.003 (R. Schmidt, Washington, DC);
09.41250, 11.4 (Cudnik);
09.80840, 10.803 V +/-0.018 (Pyatnytskyy);
10.08300, 10.717 (Poyner);
10.95670, 10.801 V +/-0.067 (T. Karlsson, Varberg, Sweden);
11.83052, 11.419 TG +/-0.007 (Sergey);
11.89743, 11.159 V +/-0.010 (Boyd);
11.89789, 13.080 B +/-0.010 (Boyd);
11.97917, 11.5 (A. Uhrin, Hungary);
12.31944, 11.5 (Shotter);
12.84170, 11.9 (W. Kriebel, Schierling/Walkenstetten, Germany);
12.99880, 11.977 V +/-0.048 (Karlsson);
13.10800, 11.827 CV (Poyner);
13.20350, 12.1 (M. Komorous, London, ONT, Canada);
13.94792, 12.1 (L. Lindhard, Esbjerg N, Denmark);

Charts: Charts with comparison stars for N Cas 2020 may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations using the name N CAS 2020. 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 TCP J00114297+6611190 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 13.5 on images obtained on Jul. 06.9054 UT (via CBAT TOCP).

c. P. Schmeer (Saarbruecken-Bischmisheim, Germany) reports there is a 17.7 V magnitude star 5" to the N (via CBAT TOCP).

d. S. Korotkiy reports the progenitor is PS1 ID=187420029290157666 (PanSTARRS-1 Image Access images), RA=00:11:42.963 DEC=+66:11:20.82, Imag ~ 21.3. (via CBAT TOCP).
 
e. Sokolovsky et al. (ATel #13919) report that an observation with Swift on 2020 Aug. 2.888 UT showed no X-ray source at the position of the nova.

f. Position end figures:
- T. Noguchi (2020 Aug. 04.548 UT, via CBAT TOCP): 42.95s, 20.8"
- J. Caron and F. Kugel (Banon, France, 2020 Aug. 7.0723 UT, via CBAT TOCP): 42.98s, 21.2"

g. Images:
- T. Noguchi (2020 Aug. 04.548 UT, via CBAT TOCP): http://park8.wakwak.com/~ngc/images/TCPinCas_20200804.jpg

Congratulations to Stanislav Korotkiy and Kirill Sokolovsky on this discovery!

This Alert Notice was compiled by Elizabeth O. Waagen.
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