Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J20225930+5239030

TCP J20225930+5239030   2019 07 07.6524*  20 22 59.30 +52 39 03.0  12.2 U             Cyg       9 0

2019 07 07.6524

Yuji Nakamura, Kameyama, Mie, Japan, reports his discovery of this TCP (mag 12.2) in Cyg on a CCD frame taken on 2019 Jul 07.6524 UT (limiting mag 13.0, exposure time 15s) using a 135mm F4.0 lens. The object was not shown on a frame taken on 2019 Jul 04.5161 UT (limiting mag 13.0).

2019 07 08.25

The likely (blue) progenitor is USNO-B1.0 1426-0409109 with Gaia DR2 position end figures 59.393s, 05.61" (equinox J2000.0, epoch 2015.5, Gmag. 20.08, parallax 0.9657 ± 0.5002 mas). Other designations are GSC2.3 N2H3009280 (Fmag. 19.70, Bjmag. 19.95), PSO J202259.394+523905.824 (gmag. 19.93, rmag. 19.95), WD J202259.39+523905.61; a fainter Gaia DR2 source (Gmag. 21.10) is 0.9" to the NE. No outbursts were recorded by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) between 2015 March 2 and 2019 July 6; complete light curve at https://asas-sn.osu.edu/light_curves/194cc108-7b48-40a9-9adc-cd658bdd623f. The transient is probably a dwarf nova outburst with an amplitude of more than 7 magnitudes (WZ Sge type?). Spectroscopy as well as multiband and time-resolved photometry are strongly recommended. --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2019 07 08.27

Correction: Gaia DR2 position end figures for the candidate are 59.393s, 05.61" (equinox J2000.0, epoch 2000.0); 59.369s, 05.48" (equinox J2000.0, epoch 2015.5) --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2019 07 09.3814

Photometry results were B=12.13 and V=12.60 with 0.25-m f/3.4 astrograph + SBIG ST-10XME CCD (T05, iTelescope.NET, Mayhill, USA). Position end figures were 59.33 and 05.6 in R.A. and Dec., respectively. http://meineko.sakura.ne.jp/ccd/TCPJ20225930+5239030.jpg　Seiichiro Kiyota (Kamagaya, Japan)

2019 07 10.4868

F. Watanabe (Nayoro Observatory, Nayoro, Japan) performed a follow-up observation for this transient using a 0.4-m f/10 Meili telescope (Meade Schmidt-Cassegrain telescope) + unfiltered CCD (SBIG STL-1001E) on Jul. 10.4868 UT. The magnitude is measured to be R = 13.1 +/- 0.1 (reference stars from UCAC4 Rmag).

2019 07 10.4868

(Correction) "unfiltered" CCD in the previous report by F. Watanabe should be "R-filtered" CCD.