Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J00114297+6611190

TCP J00114297+6611190   2020 07 27.9302*  00 11 42.97 +66 11 19.0  12.9 U             Cas       2 0

2020 07 27.9302

A transient variable objects in Cassiopeia was discovered by Stanislav Korotkiy (Ka-Dar Obs./Astrovert) and Kirill Sokolovsky (MSU/SAI MSU/ASC Lebedev) on three images, obtained on 2020 Jul 27.9302UT with a wide-field survey camera (F=135mm f/2.0 telephoto lens and ST8300M unfiltered CCD, 20sec exposure time) at Ka-Dar Observatory's TAU Station/Astrovert, Nizhny Arkhyz, Russia (MPC COD C32). The object is clearly visible at magnitude 12.9 +/-0.1. The limiting magnitude of the images is ~14.0 (the scale is calibrated using V magnitudes of Tycho-2 stars in the field). Initial astrometry using nearby Tycho-2 stars (RA, Dec, J2000): 00:11:42.70 +66:11:19.10 +/-5". The object is not visible on our previous images obtained on Jul 06.9054UT (limiting mag. 13.5). The object could not be identified as a previously known one using MPChecker, AAVSO VSX and SIMBAD.

2020 07 28.7944

A. Novichonok observed on 2020 Jul 28.7944UT with telescope RC-36 (D=360mm, F=2880mm and CCD PL-09000 with filter I, 90sec exposure time) at Kitab Observatory. Initial astrometry using nearby Gaia DR2 stars (RA, Dec, J2000): 00:11:42.960 +66:11:20.78 +/-0.2". The object is not visible on PanSTARRS-1 Image Access images (~21 mag). Stanislav Korotkiy

2020 07 29.00

We found the progenitor of the TCP J00114297+6611190 on PanSTARRS-1 Image Access images: this is PS1 ID=187420029290157666 (RA=00:11:42.963 DEC=+66:11:20.82) with Imag ~ 21.3.

2020 07 28.79

The previous message about the progenitor was from Stanislav Korotkiy. 2020-07-28.79UT photometry results were B=15.1, V=13.6 and R=12.5 with 0.36-m f/8 Ritchey-Chrétien telescope + PL-09000 CCD (Kitab observatory). A. Novichonok.

2020 07 28.457

follow-up : mag is +12.4U(Rmag) Comparison star UCAC-4 with 0.36m FLI ML1001E 30 secX84, obs by, Yasuo Sano(Nayoro Hokkaido, Japan) http://sn1997ef.web.fc2.com/sn/other/20200728/02.html

2020 07 29.4308

Photometry results were B=15.45, V=13.85 and Ic=12.31 with 0.50-m f/4.5 CDK astrograph + FLI-PL11002M CCD (T11, ITelescope.NET) at Mayhill, NM, USA. Seiichiro Kiyota (Kamagaya, Japan)

2020 07 28.4376

Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) observations: 2020 July 23.452 UT, gmag. fainter than 17.6; 28.438, gmag. 14.21; 29.582, 14.72; no previous brightenings were recorded since 2014 December 17, light curves and data at https://asas-sn.osu.edu/light_curves/b3d5ac06-3d2e-40c1-8e8d-8dd8c5cf551f and https://asas-sn.osu.edu/light_curves/375b0005-f3ee-4bd9-84a3-69e280a44af7 —— Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2020 07 29.50

Further follow-up photometry reported via the Russian-language astronomy forum ( https://astronomy.ru/forum/index.php/topic=184524.0.html ) or communicated directly to us: 2459059.31736 TG 13.340 Konstantin Makarov 2459059.31814 V 13.162 Alexander Ivanov 2459059.35860 CR 12.617 Henryk Sielewicz 2459059.3950 TG 13.51 Ivan Sergey 2459059.41846 CV 13.021 Stanislav Korotkiy 2459059.54191 CV 13.136 Stanislav Korotkiy 2459059.55770 B 14.936 Edward Emelianov 2459059.56000 B 14.940 Edward Emelianov 2459059.56230 B 14.941 Edward Emelianov 2459059.56462 B 14.948 Edward Emelianov 2459059.56917 V 13.863 Edward Emelianov 2459059.57078 V 13.858 Edward Emelianov 2459059.57240 V 13.863 Edward Emelianov 2459059.57400 V 13.867 Edward Emelianov 2459059.57561 V 13.860 Edward Emelianov 2459059.57767 R 13.140 Edward Emelianov 2459059.57928 R 13.147 Edward Emelianov 2459059.58089 R 13.148 Edward Emelianov 2459059.58251 R 13.155 Edward Emelianov 2459059.58412 R 13.154 Edward Emelianov ---- Stanislav Korotkiy, Kirill Sokolovsky

2020 08 02.550

brightening!! mag is +11.80U(Rmag) Comparison star UCAC-4 with 0.36m FLI ML1001E 30 sec, obs by, Yasuo Sano(Nayoro Hokkaido, Japan) http://sn1997ef.web.fc2.com/sn/other/20200728/02.html

2020 08 04.548

Mag.= 10.7, pisition end figures 42s.95, 20".8 observed by T. Noguchi, Chiba-ken, Japan, using 0.23-m f/10 Schmidt Cassegrain + unfiltered CCD (KAF-0261E). An image at http://park8.wakwak.com/~ngc/images/TCPinCas_20200804.jpg.

2020 08 06.000

Lightcurve of Nova Cas 2020 (TCP J00114297+6611190) constructed with the FRAM-ORM 0.25m telescope (V-band), the NMW campera (135mm/f2.0 + ST-8300M) and the 8cm refractor (ED80 + ST-8300M) (both unfiltered with V zero-point = CV-band). Filtered photometry collected by FRAM-ORM on 2020-08-05.0138 shows the near-peak magnitude V=11.84 +/-0.01. Lightcurve of Nova Cas 2020 http://scan.sai.msu.ru/~kirx/ATel/TCPJ00114297+6611190/ Kirill Sokolovsky, Stanislav Korotkiy, Sergey Karpov

2020 08 07.0723

N Cas 2020 2020 08 07.0723 00:11:42.98 +66:11:21.2 12.6 U (comparison stars GSC) 3x30s unfiltered CCD + F=195mm f/2.8 telephoto lens. Mag lim around 14.5. J. Caron, F. Kugel Observatoire Chante-Perdrix, Dauban, 04150 Banon, France. MPC station #A77.