Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J22194001+0452101

TCP J22194001+0452101   2021 05 09.7138*  22 19 40.01 +04 52 10.1  13.0 U             Peg       9 0

2021 05 09.714

Discovered by Hideo Nishimura, Kakegawa, Shizuoka-ken, Japan, who found this star on three frames (limit mag.= 14) taken using Canon EOS 6D digital camera + 200-mm f/3.2 lens with 20-s exposure, who confirmed this star on six frames taken after discovery and also who writes nothing is visible at this location on three frames taken on 2021 May 7.795 UT with same instrument. Nishimura writes a faint blue star (mag.= 19) on DSS.

2021 05 08.5637

The "faint blue star (mag.= 19) on DSS" is PSO J221940.115+045208.941 at RA 22 19 40.12, DE +04 52 08.8 (equinox J2000.0; gmag. 21.2, rmag. 21.1, imag. 21.2). Other designations are USNO-B1.0 0948-0578912 (Bmag. 20.5), GSC2.3 N0HN003922 (Fmag. 20.5, Bjmag. 21.5), SDSS J221940.12+045208.8 (umag. 20.9, gmag. 20.7, rmag. 20.7, imag. 20.8), and GALEX J221940.1+045207 (nuv_mag 22.7). Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) observations: 2021 May 3.359 UT, fainter than gmag. 16.2; 8.564 UT, gmag. 12.86; complete light curve and data at https://asas-sn.osu.edu/sky-patrol/coordinate/8a455734-723a-452b-aff0-041d79e7401b – This transient is likely a large-amplitude (WZ Sagittae-type?) dwarf nova outburst. Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)