Hanjie Tan, Guoyou Sun, Mi Zhang, Xing Gao (Xingming Observatory), report ~4.2 mag outburst in a known variable star ( 16.52 r ) which is 20.76 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 Dec. 31.54201 UT using a unfiltered CCD ( 0.3-m f/3.6 reflector ). Images can be found at: http://xjltp.china-vo.org/xm28ht.html
XM28HT C2020 12 31.54201 21 05 58.29 +52 13 13.3 16.52 r N88
*Known VS ATO J316.4913+52.2212
