ZTF23aajjayv = ATLAS23khx = TCPJ13070070+0659214: likely WZ Sge star
(ASAS-SN positive data before May 13 may have been false detections)
Large-amplitude outburst.
YYYYMMDD(UT) mag observer 20230512.0661 <16.962g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.0673 <17.048g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.0686 16.874g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2494 <15.386g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2507 <15.026g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2519 <14.876g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4247 <17.254g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4260 16.854g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4273 16.891g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3678 15.602g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3691 15.647g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3703 15.463g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.2359 14.480o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2438 14.520o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2479 14.494o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.3689 14.031g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.3701 14.026g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.3714 14.040g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.3262 14.161g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.3274 14.166g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.3287 14.186g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9732 14.266g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9745 14.256g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9757 14.302g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3228 14.295g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3240 14.314g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3253 14.279g (ASAS-SN survey (Shappee+2014; Kochanek+2017))
Also at 14.0 on May 16 (Yuji Nakamura) from TOCP. ZTF caught at 16.55 on May 13 on the rise.