CH UMa faint outburst? CH UMa may be undergoing a rather rare outburst. The latest reported major outburst occurred in 1997 September - October. A few possible brief brightenings (reaching to 13.3-13.8 mag) reported in late 1998 - 1999 January. YYMMDD(UT) mag observer 990310.024 <137 (H. McGee) 990310.142 148 (G. Hanson) 990310.849 147 (G. Poyner) 990310.851 <137 (E. Muyllaert) 990313.349 148 (R. J. Modic) 990313.951 148 (G. Poyner) 990314.863 <137 (E. Muyllaert) 990315.860 149: (G. Poyner) 990315.878 <140 (E. Muyllaert) 990316.155 148 (G. Hanson) 990316.278 149 (R. J. Modic) 990316.599 <127 (H. Maehara) 990316.908 148 (G. Poyner) 990316.940 150 (T. Kinnunen) 990317.278 150 (R. J. Modic) 990317.860 147 (G. Poyner) 990317.980 140: (H. McGee) 990318.858 150: (G. Poyner) 990318.864 <137 (E. Muyllaert) 990321.930 132 (J. Ripero)