Delta Sco still bright YYYYMMDD(UT) mag observer 20001223.871 22 (T. Watanabe) 20001229.866 21 (K. Hirosawa) 20001231.316 19 (S. Otero) 20001231.769 21 (F. Farrell) 20010104.855 20 (T. Watanabe)