| E | O (JD) | O (dat) | Period |
| -52 | 2414898 | 1899-08-31 | 459.33 |
| -51 | 2415286 | 1900-09-23 | 458.57 |
| -29 | 2425413 | 1928-06-15 | 458.47 |
| -28 | 2425850 | 1929-08-26 | 458.44 |
| -27 | 2426333 | 1930-12-22 | 459.39 |
| -26 | 2426772 | 1932-03-05 | 461.13 |
| -24 | 2427710 | 1934-09-29 | 461.96 |
| -23 | 2428180 | 1936-01-12 | 460.3 |
| -21 | 2429108 | 1938-07-28 | 464.42 |
| -20 | 2429575 | 1939-11-07 | 467.56 |
| -13 | 2432775 | 1948-08-11 | 467.59 |
| -12 | 2433217 | 1949-10-27 | 467.77 |
| 2 | 2439858 | 1968-01-02 | 468.4 |
| 3 | 2440340 | 1969-04-28 | 470.43 |
| 4 | 2440800 | 1970-08-01 | 473.15 |
| 5 | 2441280 | 1971-11-24 | 472.81 |
| 6 | 2441760 | 1973-03-18 | 473.93 |
| 7 | 2442230 | 1974-07-01 | 477.43 |
| 8 | 2442688 | 1975-10-02 | 481 |
| 9 | 2443153 | 1977-01-09 | 482.86 |
| 10 | 2443680 | 1978-06-20 | 482.79 |
| 11 | 2444144 | 1979-09-27 | 485.79 |
| 12 | 2444670 | 1981-03-06 | 491.36 |
| 13 | 2445130 | 1982-06-09 | 494.47 |
| 14 | 2445619 | 1983-10-11 | 497.44 |
| 15 | 2446100 | 1985-02-03 | 503.69 |
| 16 | 2446620 | 1986-07-08 | 513.75 |
| 18 | 2447630 | 1989-04-13 | 523.81 |
| 19 | 2448153 | 1990-09-18 | 531.25 |
| 20 | 2448720 | 1992-04-07 | 540.13 |
| 21 | 2449300 | 1993-11-08 | 550.87 |
| 22 | 2449830 | 1995-04-22 | 562.21 |
| 23 | 2450389 | 1996-11-01 | 568.5 |
| 24 | 2450973 | 1998-06-08 | 570.36 |
| 25 | 2451540 | 1999-12-27 | 576.21 |
| 26 | 2452114 | 2001-07-23 | 583.29 |
| 27 | 2452718 | 2003-03-19 | 583.36 |
| 28 | 2453287 | 2004-10-08 | 585.57 |
| 29 | 2453910 | 2006-06-23 | 587.29 |
| 30 | 2454475 | 2008-01-09 | 586.21 |
| 31 | 2455054 | 2009-08-10 | 587.21 |
| 32 | 2455657 | 2011-04-05 | 586.36 |
| 33 | 2456219 | 2012-10-18 | 584 |
| 34 | 2456820 | 2014-06-11 | 584.43 |
| 35 | 2457406 | 2016-01-18 | 584 |
| 36 | 2458000 | 2017-09-03 | 584.76 |
| 37 | 2458561 | 2019-03-18 | 586.09 |
| 38 | 2459150 | 2020-10-27 | 583 |
| 39 | 2459737 | 2022-06-06 | 582.4 |
| 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. |