| E | O (JD) | O (dat) | Period |
| -58 | 2433890 | 1951-08-31 | 337.29 |
| -50 | 2436542 | 1958-12-04 | 336.74 |
| -49 | 2436883 | 1959-11-10 | 334.29 |
| -48 | 2437219 | 1960-10-11 | 332.72 |
| -47 | 2437567 | 1961-09-24 | 334.04 |
| -46 | 2437899 | 1962-08-22 | 335.05 |
| -43 | 2438886 | 1965-05-05 | 334.62 |
| -41 | 2439545 | 1967-02-23 | 335.14 |
| -40 | 2439906 | 1968-02-19 | 335.23 |
| -39 | 2440220 | 1968-12-29 | 336.1 |
| -37 | 2440909 | 1970-11-18 | 337.06 |
| -36 | 2441250 | 1971-10-25 | 335.88 |
| -35 | 2441591 | 1972-09-30 | 335.69 |
| -34 | 2441916 | 1973-08-21 | 333.6 |
| -33 | 2442245 | 1974-07-16 | 328.36 |
| -32 | 2442580 | 1975-06-16 | 327.07 |
| -31 | 2442917 | 1976-05-18 | 328.5 |
| -30 | 2443216 | 1977-03-13 | 330.07 |
| -29 | 2443540 | 1978-01-31 | 329.21 |
| -28 | 2443880 | 1979-01-06 | 326.93 |
| -27 | 2444226 | 1979-12-18 | 328.07 |
| -26 | 2444556 | 1980-11-12 | 330.07 |
| -25 | 2444878 | 1981-09-30 | 328.5 |
| -24 | 2445196 | 1982-08-14 | 328.33 |
| -23 | 2445530 | 1983-07-14 | 328.12 |
| -22 | 2445847 | 1984-05-26 | 328.12 |
| -21 | 2446172 | 1985-04-16 | 330.25 |
| -19 | 2446859 | 1987-03-04 | 331.56 |
| -18 | 2447173 | 1988-01-12 | 332.81 |
| -17 | 2447511 | 1988-12-15 | 334.88 |
| -16 | 2447847 | 1989-11-16 | 335.4 |
| -15 | 2448184 | 1990-10-19 | 335.71 |
| -14 | 2448518 | 1991-09-18 | 335.64 |
| -13 | 2448859 | 1992-08-24 | 335.21 |
| -12 | 2449203 | 1993-08-03 | 336.14 |
| -11 | 2449529 | 1994-06-25 | 336.07 |
| -10 | 2449854 | 1995-05-16 | 335.79 |
| -9 | 2450197 | 1996-04-23 | 335 |
| -8 | 2450540 | 1997-04-01 | 335.14 |
| -7 | 2450867 | 1998-02-22 | 336.71 |
| -6 | 2451211 | 1999-02-01 | 335.93 |
| -5 | 2451541 | 1999-12-28 | 334.21 |
| -4 | 2451883 | 2000-12-04 | 333.93 |
| -3 | 2452214 | 2001-10-31 | 333.64 |
| -2 | 2452540 | 2002-09-22 | 331.87 |
| -1 | 2452876 | 2003-08-24 | 330.75 |
| 0 | 2453206 | 2004-07-19 | 331.19 |
| 1 | 2453543 | 2005-06-21 | 331.75 |
| 3 | 2454187 | 2007-03-27 | 331.5 |
| 4 | 2454529 | 2008-03-03 | 331.37 |
| 5 | 2454867 | 2009-02-04 | 331.31 |
| 6 | 2455195 | 2009-12-29 | 332.47 |
| 7 | 2455525 | 2010-11-24 | 333.93 |
| 8 | 2455859 | 2011-10-24 | 333.14 |
| 9 | 2456191 | 2012-09-20 | 332.57 |
| 10 | 2456526 | 2013-08-21 | 333 |
| 11 | 2456865 | 2014-07-26 | 332.93 |
| 12 | 2457195 | 2015-06-21 | 331.93 |
| 13 | 2457523 | 2016-05-14 | 331.29 |
| 14 | 2457859 | 2017-04-15 | 329.93 |
| 15 | 2458186 | 2018-03-08 | 328.36 |
| 16 | 2458511 | 2019-01-27 | 327.5 |
| 17 | 2458844 | 2019-12-26 | 326.83 |
| 18 | 2459166 | 2020-11-12 | 326.37 |
| 19 | 2459491 | 2021-10-03 | 326.58 |
| 20 | 2459812 | 2022-08-20 | 326.9 |
| 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. |