Hanjie Tan and Xing Gao, report ~3.2 mag outburst in a known variable star ( 15.4 r ) which is 18.65 rmag in Pan-STARRS DR1 catalogue. The transient was discovered on several 120-s survey images ( limiting mag about 18.0 ) taken by Xing Gao at Xingming Observatory #3 ( N88 ) around Sep. 02.68172 UT using a unfiltered CCD ( 0.3-m f/3.6 reflector ). Images can be found at: http://xjltp.china-vo.org/xm12ht.html
XM12HT C2020 12 02.68172 22 54 17.72 +62 17 28.3 15.4 r N88
*Known VS ZTF J225417.79+621730.2
