Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J04291884+4354232

TCP J04291884+4354232   2020 11 25.8071*  04 29 18.84 +43 54 23.2  10.6 U             Per       4 0

2020 11 25.807

Discovered by Seiji Ueda, Kushiro, Hokkaido, Japan, with on 14-s exposure on six frames using Canon EOS 6D digital camera + f/3.2 200-mm lens under the limiting mag = 13.9, who writes that nothing is visible at this location on a frame taken on 2020 Nov. 23 UT with the limit mag= 13.6 using same instruments. Also he writes that there is a faint star (mag.= 19.1) on USNO-B1 catalog. He confirmed this star on three frames (limit mag.= 15.6) using 0.16-m f/6.3 reflector on Nov. 25.813 UT.

2020 11 25.3654

The "faint star (mag.= 19.1)" mentioned by Ueda-san is USNO-B1.0 1339-0102783. No brightenings were recorded by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) between 2012 February 14 / 2014 December 16 and 2020 November 25; latest observation 2020 November 25.365 UT, fainter than gmag. 16.8; complete "light curve" and data at https://asas-sn.osu.edu/light_curves/d1dc7531-94b3-44b7-bd0f-8f70680a1459 --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2020 11 26.115

Mag. V= 10.22, I= 9.08, B= 10.90, position end figures 18s.88, 22".8 observed by K. Yoshimoto, Yamaguchi-ken, Japan, using 0.25-m f/3.4 reflector + CCD near Mayhill, New Mexico, remotoly. An I-band image at http://orange.zero.jp/k-yoshimoto/TCP_J04291884+4354232_20201126.jpg.

2020 11 26.358

Mag.= 10.0, position end figures 18s.84, 23".1 observed by T. Noguchi, Katori, Chiba-ken, Japan, using 0.23-m f/10 Schmidt Cassegrain + unfiltered CCD (KAF-0261E), An image at http://park8.wakwak.com/~ngc/images/TCPinPer_20201126.jpg.

2020 11 26.349

follow-up : mag is +9.76U(Rmag) Comparison star UCAC-4 with 0.36m FLI ML1001E 20 sec x 15, obs by, Yasuo Sano(Nayoro Hokkaido, Japan) http://sn1997ef.web.fc2.com/sn/nova/2020-tcpj04291884_4354232-nova.html

2020 11 26.0645

Photometry results were B=10.84, V=10.25 and Ic=9.33 with 0.25m Reflector + SBIG ST-10XME CCD at Mayhill, NM, USA. Position end figures were 18.85 and 23.3in R.A. and Dec., respectively. Seiichiro Kiyota (Kamagaya, Japan)

2020 11 26.38704

Follow-up observation: November 26.38704, 2020. Mag.= 10.025 TG +/-0.02 using Canon EOS 60D camera with 135-mm F/5.6 lens (stacked 46x5 sec., ISO-6400). Filipp Romanov (Yuzhno-Morskoy, Nakhodka, Russia). My photo: https://www.flickr.com/photos/filipp-romanov/50648272161

2020 11 26.363

F. Watanabe (Nayoro Observatory, Nayoro, Japan) also performed a follow-up observation for this transient using a 0.4-m f/10 Meili telescope (Meade LX200-40ACF) + R-filtered CCD (SBIG STL-1001E) on Nov. 26.363 UT. The magnitude is measured to be R = 9.6 +/- 0.1 (reference stars from UCAC4 Rmag) and the position end figures are given as 18s.81, 22”.0

2020 11 27.43551

My new follow-up observation: November 27.43551, 2020. Mag.= 9.038 TG +/-0.01 using Canon EOS 60D camera with 135-mm f/5.6 lens (stacked 46x5 sec., ISO-6400). It is getting brighter. Filipp Romanov (Yuzhno-Morskoy, Nakhodka, Russia). My new photo: https://www.flickr.com/photos/filipp-romanov/50653035586

2020 11 26.024

Visual magnitude estimates by P. Schmeer, Bischmisheim, Germany: 2020 November 26.024 UT, 10.2; 26.792, 9.5. Instrument: 203-mm SCT, sequence: AAVSO (V magnitudes).

2020 11 27.84104

New follow-up observation: 2020 November 27.84104 UT. Mag. = 8.681 TG +/- 0.005 using Canon EOS 60D camera with 135-mm f/5.6 lens (stacked 46x5 sec., ISO-6400), after moonset. Filipp Romanov (Yuzhno-Morskoy, Nakhodka, Russia). New photo: https://www.flickr.com/photos/filipp-romanov/50654723251

2020 11 28.44382

Probably, the maximum brightness is passed. Observation: 2020 Nov. 28.44382 UT, mag.= 8.753 TG +/-0.01. Canon EOS 60D camera, 135-mm f/5.6 lens (stacked 46x5 sec., ISO-6400), from Yuzhno-Morskoy, Nakhodka, Russia (Filipp Romanov). Photo: https://www.flickr.com/photos/filipp-romanov/50657001287