| E | O (JD) | O (dat) | Period |
| -58 | 2412730 | 1893-09-23 | 426.21 |
| -55 | 2414050 | 1897-05-05 | 422.47 |
| -53 | 2414850 | 1899-07-14 | 421.29 |
| -52 | 2415286 | 1900-09-23 | 421.86 |
| -51 | 2415735 | 1901-12-16 | 422.44 |
| -50 | 2416150 | 1903-02-04 | 424.32 |
| -47 | 2417375 | 1906-06-13 | 425.04 |
| -46 | 2417800 | 1907-08-12 | 427.65 |
| -45 | 2418250 | 1908-11-04 | 429.52 |
| -44 | 2418680 | 1910-01-08 | 432.02 |
| -41 | 2419995 | 1913-08-15 | 435.34 |
| -40 | 2420420 | 1914-10-14 | 441.1 |
| -39 | 2420860 | 1915-12-28 | 443.52 |
| -37 | 2421750 | 1918-06-05 | 447.1 |
| -36 | 2422205 | 1919-09-03 | 450.03 |
| -35 | 2422640 | 1920-11-11 | 453.74 |
| -33 | 2423580 | 1923-06-09 | 455.42 |
| -32 | 2424030 | 1924-09-01 | 456.52 |
| -29 | 2425413 | 1928-06-15 | 457.69 |
| -28 | 2425850 | 1929-08-26 | 458.83 |
| -27 | 2426333 | 1930-12-22 | 460.34 |
| -26 | 2426772 | 1932-03-05 | 459.94 |
| -25 | 2427230 | 1933-06-06 | 460.44 |
| -24 | 2427697 | 1934-09-16 | 460.42 |
| -23 | 2428180 | 1936-01-12 | 460.96 |
| -21 | 2429108 | 1938-07-28 | 460.18 |
| -20 | 2429544 | 1939-10-07 | 466 |
| -17 | 2430925 | 1943-07-19 | 467.64 |
| -16 | 2431380 | 1944-10-16 | 468.35 |
| -13 | 2432775 | 1948-08-11 | 469.05 |
| -12 | 2433217 | 1949-10-27 | 470.08 |
| 2 | 2439858 | 1968-01-02 | 471.1 |
| 3 | 2440340 | 1969-04-28 | 471.87 |
| 4 | 2440800 | 1970-08-01 | 472.31 |
| 5 | 2441280 | 1971-11-24 | 473.47 |
| 6 | 2441760 | 1973-03-18 | 474.57 |
| 7 | 2442230 | 1974-07-01 | 478.09 |
| 8 | 2442688 | 1975-10-02 | 479.86 |
| 9 | 2443153 | 1977-01-09 | 482.23 |
| 10 | 2443680 | 1978-06-20 | 483.55 |
| 11 | 2444144 | 1979-09-27 | 487.06 |
| 12 | 2444670 | 1981-03-06 | 491.65 |
| 13 | 2445130 | 1982-06-09 | 494.68 |
| 14 | 2445619 | 1983-10-11 | 497.38 |
| 15 | 2446100 | 1985-02-03 | 501.54 |
| 16 | 2446632 | 1986-07-20 | 510.19 |
| 17 | 2447150 | 1987-12-20 | 517.15 |
| 18 | 2447630 | 1989-04-13 | 526.53 |
| 19 | 2448153 | 1990-09-18 | 535.55 |
| 20 | 2448720 | 1992-04-07 | 543.89 |
| 21 | 2449300 | 1993-11-08 | 550.74 |
| 22 | 2449830 | 1995-04-22 | 559.38 |
| 23 | 2450389 | 1996-11-01 | 566.82 |
| 24 | 2450973 | 1998-06-08 | 572.96 |
| 25 | 2451540 | 1999-12-27 | 576.23 |
| 26 | 2452114 | 2001-07-23 | 579.26 |
| 27 | 2452718 | 2003-03-19 | 583.76 |
| 28 | 2453287 | 2004-10-08 | 584.93 |
| 29 | 2453910 | 2006-06-23 | 585.82 |
| 30 | 2454475 | 2008-01-09 | 586.74 |
| 31 | 2455054 | 2009-08-10 | 587.1 |
| 32 | 2455657 | 2011-04-05 | 585.55 |
| 33 | 2456219 | 2012-10-18 | 585.1 |
| 34 | 2456820 | 2014-06-11 | 583.9 |
| 35 | 2457406 | 2016-01-18 | 584.72 |
| 36 | 2458000 | 2017-09-03 | 584.58 |
| 37 | 2458561 | 2019-03-18 | 583.71 |
| 38 | 2459150 | 2020-10-27 | 584.61 |
| 39 | 2459737 | 2022-06-06 | 582.23 |
| 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. |