| E | O (JD) | O (dat) | Period |
| -55 | 2414700 | 1899-02-14 | 518.59 |
| -53 | 2415735 | 1901-12-16 | 519.19 |
| -52 | 2416235 | 1903-04-30 | 518.87 |
| -51 | 2416770 | 1904-10-16 | 516.87 |
| -50 | 2417280 | 1906-03-10 | 515.95 |
| -49 | 2417817 | 1907-08-29 | 514.97 |
| -48 | 2418331 | 1909-01-24 | 513.77 |
| -47 | 2418842 | 1910-06-19 | 513.28 |
| -46 | 2419330 | 1911-10-20 | 511.84 |
| -45 | 2419850 | 1913-03-23 | 511.94 |
| -44 | 2420355 | 1914-08-10 | 512.49 |
| -43 | 2420869 | 1916-01-06 | 515.21 |
| -42 | 2421390 | 1917-06-10 | 518.19 |
| -41 | 2421900 | 1918-11-02 | 521 |
| -40 | 2422425 | 1920-04-10 | 522.35 |
| -39 | 2422954 | 1921-09-21 | 524.35 |
| -38 | 2423492 | 1923-03-13 | 525.93 |
| -37 | 2424016 | 1924-08-18 | 526.66 |
| -36 | 2424536 | 1926-01-20 | 527.4 |
| -35 | 2425057 | 1927-06-25 | 527 |
| -34 | 2425593 | 1928-12-12 | 525.69 |
| -33 | 2426126 | 1930-05-29 | 524.25 |
| -32 | 2426645 | 1931-10-30 | 523.75 |
| -31 | 2427175 | 1933-04-12 | 523.26 |
| -30 | 2427695 | 1934-09-14 | 522.52 |
| -29 | 2428204 | 1936-02-05 | 521.78 |
| -28 | 2428722 | 1937-07-07 | 522 |
| -27 | 2429251 | 1938-12-18 | 522.28 |
| -26 | 2429774 | 1940-05-24 | 522.99 |
| -25 | 2430296 | 1941-10-28 | 523.76 |
| -24 | 2430823 | 1943-04-08 | 525.31 |
| -23 | 2431354 | 1944-09-20 | 526.28 |
| -22 | 2431868 | 1946-02-16 | 527.16 |
| -21 | 2432403 | 1947-08-05 | 527.91 |
| -20 | 2432920 | 1949-01-03 | 527.88 |
| -19 | 2433462 | 1950-06-29 | 527.65 |
| -18 | 2433992 | 1951-12-11 | 526.88 |
| -17 | 2434526 | 1953-05-28 | 527.1 |
| -16 | 2435049 | 1954-11-02 | 526.33 |
| -15 | 2435564 | 1956-03-31 | 525.47 |
| -14 | 2436091 | 1957-09-09 | 524.05 |
| -13 | 2436606 | 1959-02-06 | 523.35 |
| -12 | 2437147 | 1960-07-31 | 523.24 |
| -11 | 2437667 | 1962-01-02 | 523.95 |
| -10 | 2438183 | 1963-06-02 | 524.35 |
| -9 | 2438706 | 1964-11-06 | 524.02 |
| -8 | 2439229 | 1966-04-13 | 524.01 |
| -7 | 2439759 | 1967-09-25 | 523.66 |
| -6 | 2440290 | 1969-03-09 | 523.43 |
| -5 | 2440808 | 1970-08-09 | 522.45 |
| -4 | 2441326 | 1972-01-09 | 521.45 |
| -3 | 2441853 | 1973-06-19 | 520.9 |
| -2 | 2442380 | 1974-11-28 | 520.36 |
| -1 | 2442888 | 1976-04-19 | 519.92 |
| 0 | 2443396 | 1977-09-09 | 520.03 |
| 1 | 2443922 | 1979-02-17 | 520.3 |
| 2 | 2444452 | 1980-07-31 | 520.35 |
| 3 | 2444974 | 1982-01-04 | 520.83 |
| 4 | 2445489 | 1983-06-03 | 521.92 |
| 5 | 2446010 | 1984-11-05 | 522.41 |
| 6 | 2446536 | 1986-04-15 | 522.04 |
| 7 | 2447055 | 1987-09-16 | 522.14 |
| 8 | 2447578 | 1989-02-20 | 522.26 |
| 9 | 2448104 | 1990-07-31 | 522.71 |
| 10 | 2448626 | 1992-01-04 | 522.72 |
| 11 | 2449145 | 1993-06-06 | 523.02 |
| 12 | 2449674 | 1994-11-17 | 522.88 |
| 13 | 2450189 | 1996-04-15 | 521.79 |
| 14 | 2450717 | 1997-09-25 | 521.27 |
| 15 | 2451238 | 1999-02-28 | 520.51 |
| 16 | 2451769 | 2000-08-12 | 519.24 |
| 17 | 2452280 | 2002-01-05 | 517.75 |
| 18 | 2452785 | 2003-05-25 | 517.17 |
| 19 | 2453316 | 2004-11-06 | 516.74 |
| 20 | 2453827 | 2006-04-01 | 516.69 |
| 21 | 2454334 | 2007-08-21 | 516.89 |
| 22 | 2454848 | 2009-01-16 | 517.75 |
| 23 | 2455374 | 2010-06-26 | 519.41 |
| 24 | 2455899 | 2011-12-03 | 520.35 |
| 25 | 2456416 | 2013-05-03 | 521.93 |
| 26 | 2456936 | 2014-10-05 | 523.36 |
| 27 | 2457453 | 2016-03-05 | 523.88 |
| 28 | 2457994 | 2017-08-28 | 524.02 |
| 29 | 2458515 | 2019-01-31 | 524.49 |
| 30 | 2459038 | 2020-07-07 | 525.57 |
| 31 | 2459566 | 2021-12-17 | 526.46 |
| 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. |