Table 5: The orbital phase of minimum light for those seasons of the available data where the V amplitude was large enough to allow an accurate determination. The first column gives the mean equinox of all the observations in each season. The second column gives the activity cycle phase derived from the ephemeris in Eq. (1). The fourth column gives the orbital phase drift of minimum light from the previous season (this season minus previous season) in units of $\mbox{phase yr}^{-1}$.
Mean Activity Phase Phase
equinox phase $\varphi_{\rm a}$ of $V_{\rm min}$ drift ( $\mbox{yr}^{-1}$)
1972.19 0.134 - -
1972.79 0.158 0.7335 -
1974.95 0.246 - -
1975.99 0.289 - -
1976.86 0.324 - -
1979.94 0.450 - -
1981.99 0.534 0.6414 -
1983.00 0.575 0.6111 -0.0300
1984.10 0.620 0.6388 +0.0252
1984.95 0.654 0.5534 -0.1005
1985.85 0.691 0.6001 +0.0519
1987.11 0.743 0.5892 -0.0087
1988.00 0.779 0.5456 -0.0490
1988.94 0.817 0.4368 -0.1157
1989.94 0.858 0.4036 -0.0332
1991.01 0.902 - -
1992.94 0.981 0.7694 -
1993.96 0.022 0.6606 -0.1067
1995.01 0.065 0.5511 -0.1043
1995.93 0.103 0.7908 +0.2605
1997.03 0.148 0.7808 -0.0091
1997.95 0.185 0.6912 -0.0974
1998.95 0.226 0.6513 -0.0399
1999.93 0.266 0.6603 +0.0092
2000.95 0.308 - -
2001.90 0.346 - -


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