HT Cas possible superoutburst (early photometry update) YYMMDD(UT) mag observer 990720.947 <128 (P. A. Dubovsky) 990720.985 <139 (H. McGee) 990720.985 <139 (E. Muyllaert) 990721.975 <139 (P. A. Dubovsky) 990723.072 <159 (G. Poyner) 990724.049 <155 (G. Poyner) 990724.051 <139 (H. McGee) 990725.931 <133 (P. Schmeer) 990726.087 <136 (P. Schmeer) 990726.925 125: (P. Schmeer) 990726.941 129 (E. Muyllaert) 990727.090 127 (P. Schmeer) 990727.092 123 (P. Schmeer)