| E | O (JD) | O (dat) | Period |
| -87 | 2428540 | 1937-01-06 | 298.15 |
| -62 | 2435865 | 1957-01-26 | 295.18 |
| -61 | 2436189 | 1957-12-16 | 291.45 |
| -60 | 2436493 | 1958-10-16 | 291.77 |
| -59 | 2436806 | 1959-08-25 | 292.3 |
| -56 | 2437641 | 1961-12-07 | 293.63 |
| -55 | 2437920 | 1962-09-12 | 294.34 |
| -52 | 2438762 | 1965-01-01 | 294.38 |
| -51 | 2439089 | 1965-11-24 | 295.53 |
| -45 | 2440893 | 1970-11-02 | 297.66 |
| -44 | 2441208 | 1971-09-13 | 299.47 |
| -41 | 2442100 | 1974-02-21 | 299.93 |
| -40 | 2442395 | 1974-12-13 | 298.13 |
| -39 | 2442691 | 1975-10-05 | 296.72 |
| -38 | 2442975 | 1976-07-15 | 295.56 |
| -37 | 2443274 | 1977-05-10 | 294.64 |
| -36 | 2443565 | 1978-02-25 | 294.36 |
| -35 | 2443877 | 1979-01-03 | 294.5 |
| -34 | 2444160 | 1979-10-13 | 294.14 |
| -33 | 2444460 | 1980-08-08 | 292.79 |
| -32 | 2444747 | 1981-05-22 | 291.29 |
| -31 | 2445042 | 1982-03-13 | 290.79 |
| -30 | 2445325 | 1982-12-21 | 291.86 |
| -29 | 2445613 | 1983-10-05 | 291.36 |
| -28 | 2445907 | 1984-07-25 | 291.64 |
| -27 | 2446201 | 1985-05-15 | 292.14 |
| -26 | 2446505 | 1986-03-15 | 291.5 |
| -25 | 2446781 | 1986-12-16 | 291.07 |
| -24 | 2447091 | 1987-10-22 | 291 |
| -23 | 2447366 | 1988-07-23 | 290.14 |
| -22 | 2447653 | 1989-05-06 | 289.79 |
| -21 | 2447942 | 1990-02-19 | 289.43 |
| -20 | 2448240 | 1990-12-14 | 288.71 |
| -19 | 2448528 | 1991-09-28 | 289.36 |
| -18 | 2448815 | 1992-07-11 | 289.5 |
| -17 | 2449109 | 1993-05-01 | 288.79 |
| -16 | 2449390 | 1994-02-06 | 288.93 |
| -15 | 2449680 | 1994-11-23 | 290.36 |
| -14 | 2449968 | 1995-09-07 | 290.93 |
| -13 | 2450257 | 1996-06-22 | 292.29 |
| -12 | 2450556 | 1997-04-17 | 293.86 |
| -11 | 2450852 | 1998-02-07 | 294.8 |
| -10 | 2451145 | 1998-11-27 | 294.69 |
| -9 | 2451446 | 1999-09-24 | 292.63 |
| -8 | 2451738 | 2000-07-12 | 290.88 |
| -6 | 2452332 | 2002-02-26 | 290.88 |
| -5 | 2452608 | 2002-11-29 | 290.75 |
| -4 | 2452887 | 2003-09-04 | 290.06 |
| -3 | 2453175 | 2004-06-18 | 287.73 |
| -2 | 2453476 | 2005-04-15 | 287 |
| -1 | 2453767 | 2006-01-31 | 289.71 |
| 0 | 2454058 | 2006-11-18 | 289.5 |
| 1 | 2454328 | 2007-08-15 | 287.29 |
| 2 | 2454630 | 2008-06-12 | 285.43 |
| 3 | 2454921 | 2009-03-30 | 284.93 |
| 4 | 2455194 | 2009-12-28 | 285.86 |
| 5 | 2455479 | 2010-10-09 | 284.86 |
| 6 | 2455760 | 2011-07-17 | 283.21 |
| 7 | 2456054 | 2012-05-06 | 284.21 |
| 8 | 2456334 | 2013-02-10 | 285.13 |
| 9 | 2456612 | 2013-11-15 | 286.31 |
| 10 | 2456904 | 2014-09-03 | 288.19 |
| 11 | 2457190 | 2015-06-16 | 289.19 |
| 13 | 2457760 | 2017-01-06 | 291.06 |
| 14 | 2458060 | 2017-11-02 | 293.31 |
| 15 | 2458365 | 2018-09-03 | 294.56 |
| 16 | 2458650 | 2019-06-15 | 296.33 |
| 17 | 2458953 | 2020-04-13 | 297.83 |
| 18 | 2459256 | 2021-02-10 | 296.66 |
| 19 | 2459551 | 2021-12-02 | 297.83 |
| 20 | 2459844 | 2022-09-21 | 300.4 |
| 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. |