| E | O (JD) | O (dat) | Period |
| -37 | 2423640 | 1923-08-08 | 186.14 |
| -30 | 2424950 | 1927-03-10 | 186.25 |
| -23 | 2426260 | 1930-10-10 | 186.69 |
| -18 | 2427180 | 1933-04-17 | 186.78 |
| -16 | 2427555 | 1934-04-27 | 186.43 |
| -14 | 2427930 | 1935-05-07 | 185.77 |
| -12 | 2428310 | 1936-05-21 | 185.97 |
| -10 | 2428680 | 1937-05-26 | 186.79 |
| -8 | 2429045 | 1938-05-26 | 186.36 |
| -6 | 2429410 | 1939-05-26 | 186.36 |
| -4 | 2429795 | 1940-06-14 | 186.25 |
| -2 | 2430170 | 1941-06-24 | 185.67 |
| 0 | 2430533 | 1942-06-22 | 185.62 |
| 2 | 2430925 | 1943-07-19 | 185 |
| 4 | 2431280 | 1944-07-08 | 184.37 |
| 8 | 2432015 | 1946-07-13 | 184.44 |
| 10 | 2432380 | 1947-07-13 | 184.44 |
| 12 | 2432745 | 1948-07-12 | 184.47 |
| 14 | 2433120 | 1949-07-22 | 184.45 |
| 16 | 2433485 | 1950-07-22 | 184.32 |
| 18 | 2433875 | 1951-08-16 | 184.23 |
| 63 | 2442165 | 1974-04-27 | 184.07 |
| 67 | 2442895 | 1976-04-26 | 183.95 |
| 68 | 2443065 | 1976-10-13 | 183.82 |
| 71 | 2443615 | 1978-04-16 | 183.38 |
| 73 | 2443970 | 1979-04-06 | 182.22 |
| 76 | 2444525 | 1980-10-12 | 182.5 |
| 77 | 2444710 | 1981-04-15 | 183.26 |
| 78 | 2444900 | 1981-10-22 | 183.81 |
| 79 | 2445080 | 1982-04-20 | 183.89 |
| 80 | 2445260 | 1982-10-17 | 184.06 |
| 82 | 2445635 | 1983-10-27 | 183.12 |
| 83 | 2445810 | 1984-04-19 | 183.12 |
| 84 | 2445995 | 1984-10-21 | 184.06 |
| 85 | 2446185 | 1985-04-29 | 183 |
| 86 | 2446355 | 1985-10-16 | 182.14 |
| 87 | 2446555 | 1986-05-04 | 182.5 |
| 88 | 2446730 | 1986-10-26 | 182.14 |
| 89 | 2446910 | 1987-04-24 | 181.37 |
| 90 | 2447085 | 1987-10-16 | 180.59 |
| 91 | 2447275 | 1988-04-23 | 180.12 |
| 92 | 2447455 | 1988-10-20 | 180.17 |
| 114 | 2451433 | 1999-09-11 | 180.4 |
| 141 | 2456285 | 2012-12-23 | 180.49 |
| 142 | 2456453 | 2013-06-09 | 180.37 |
| 143 | 2456645 | 2013-12-18 | 180.14 |
| 144 | 2456833 | 2014-06-24 | 180.05 |
| 145 | 2457020 | 2014-12-28 | 181.93 |
| 146 | 2457190 | 2015-06-16 | 181.21 |
| 147 | 2457370 | 2015-12-13 | 180 |
| 148 | 2457550 | 2016-06-10 | 180.36 |
| 149 | 2457735 | 2016-12-12 | 180 |
| 150 | 2457900 | 2017-05-26 | 179.29 |
| 151 | 2458098 | 2017-12-10 | 178.57 |
| 152 | 2458280 | 2018-06-10 | 178.93 |
| 153 | 2458450 | 2018-11-27 | 181.07 |
| 154 | 2458620 | 2019-05-16 | 179.43 |
| 155 | 2458800 | 2019-11-12 | 176.57 |
| 156 | 2458990 | 2020-05-20 | 177.14 |
| 157 | 2459180 | 2020-11-26 | 177.5 |
| 158 | 2459330 | 2021-04-25 | 178.49 |
| 159 | 2459520 | 2021-11-01 | 177.71 |
| 160 | 2459690 | 2022-04-20 | 172.08 |
| 161 | 2459865 | 2022-10-12 | 168.5 |
| E | Cycle number from the GCVS4 epoch. |
| O (JD) | Julian date at observed time for maximum. |
| O (Dat) | Same as above, expressed as date. |
| Period | Calculated mean period at cycle number E. |