| E | O (JD) | O (dat) | Period |
| -55 | 2411722 | 1890-12-20 | 539.28 |
| -53 | 2412801 | 1893-12-03 | 534.93 |
| -52 | 2413329 | 1895-05-15 | 529.85 |
| -51 | 2413888 | 1896-11-24 | 531.65 |
| -50 | 2414418 | 1898-05-08 | 530.74 |
| -49 | 2414929 | 1899-10-01 | 531.65 |
| -48 | 2415455 | 1901-03-11 | 533.47 |
| -47 | 2415984 | 1902-08-22 | 533.31 |
| -46 | 2416500 | 1904-01-20 | 534.94 |
| -45 | 2417073 | 1905-08-15 | 537.12 |
| -43 | 2418146 | 1908-07-23 | 535.94 |
| -42 | 2418693 | 1910-01-21 | 536.55 |
| -41 | 2419213 | 1911-06-25 | 537.11 |
| -39 | 2420302 | 1914-06-18 | 533.36 |
| -38 | 2420784 | 1915-10-13 | 532.63 |
| -37 | 2421358 | 1917-05-09 | 536.87 |
| -36 | 2421883 | 1918-10-16 | 538.26 |
| -35 | 2422403 | 1920-03-19 | 540 |
| -34 | 2422958 | 1921-09-25 | 543.5 |
| -33 | 2423538 | 1923-04-28 | 543.14 |
| -32 | 2424051 | 1924-09-22 | 543.78 |
| -31 | 2424595 | 1926-03-20 | 543 |
| -30 | 2425156 | 1927-10-02 | 538.87 |
| -29 | 2425689 | 1929-03-18 | 537.15 |
| -28 | 2426210 | 1930-08-21 | 538.22 |
| -27 | 2426753 | 1932-02-15 | 535.14 |
| -26 | 2427287 | 1933-08-02 | 532.21 |
| -25 | 2427822 | 1935-01-19 | 532.42 |
| -24 | 2428359 | 1936-07-09 | 532.57 |
| -23 | 2428884 | 1937-12-16 | 530.07 |
| -22 | 2429412 | 1939-05-28 | 527.8 |
| -21 | 2429941 | 1940-11-07 | 527.94 |
| -20 | 2430478 | 1942-04-28 | 528.44 |
| -19 | 2430983 | 1943-09-15 | 527.81 |
| -17 | 2432043 | 1946-08-10 | 527.5 |
| -16 | 2432585 | 1948-02-03 | 529 |
| -15 | 2433113 | 1949-07-15 | 531.06 |
| -14 | 2433628 | 1950-12-12 | 532.2 |
| -13 | 2434165 | 1952-06-01 | 531.35 |
| -12 | 2434718 | 1953-12-06 | 531.43 |
| -11 | 2435240 | 1955-05-12 | 533.72 |
| -10 | 2435769 | 1956-10-22 | 533.65 |
| -9 | 2436298 | 1958-04-04 | 531.57 |
| -8 | 2436840 | 1959-09-28 | 531 |
| -7 | 2437373 | 1961-03-14 | 532.21 |
| -6 | 2437891 | 1962-08-14 | 532.14 |
| -5 | 2438434 | 1964-02-08 | 527.71 |
| -4 | 2438958 | 1965-07-16 | 525.42 |
| -3 | 2439502 | 1967-01-11 | 526.71 |
| -2 | 2440015 | 1968-06-07 | 526.22 |
| -1 | 2440511 | 1969-10-16 | 523.37 |
| 0 | 2441058 | 1971-04-16 | 519.3 |
| 1 | 2441580 | 1972-09-19 | 516.72 |
| 2 | 2442112 | 1974-03-05 | 518.57 |
| 3 | 2442607 | 1975-07-13 | 519.14 |
| 4 | 2443123 | 1976-12-10 | 517.92 |
| 5 | 2443628 | 1978-04-29 | 518.78 |
| 6 | 2444158 | 1979-10-11 | 520.35 |
| 7 | 2444679 | 1981-03-15 | 523.14 |
| 8 | 2445210 | 1982-08-28 | 525.85 |
| 9 | 2445745 | 1984-02-14 | 527 |
| 10 | 2446259 | 1985-07-12 | 528.44 |
| 11 | 2446795 | 1986-12-30 | 527.72 |
| 12 | 2447318 | 1988-06-05 | 524.07 |
| 13 | 2447846 | 1989-11-15 | 523.28 |
| 14 | 2448389 | 1991-05-12 | 522.71 |
| 15 | 2448888 | 1992-09-22 | 521 |
| 16 | 2449404 | 1994-02-20 | 519.57 |
| 17 | 2449926 | 1995-07-27 | 517.21 |
| 18 | 2450446 | 1996-12-28 | 517.35 |
| 19 | 2450961 | 1998-05-27 | 520.15 |
| 20 | 2451477 | 1999-10-25 | 521.3 |
| 21 | 2451999 | 2001-03-30 | 521.43 |
| 22 | 2452521 | 2002-09-03 | 524 |
| 23 | 2453053 | 2004-02-17 | 526.35 |
| 24 | 2453575 | 2005-07-23 | 527.64 |
| 25 | 2454097 | 2006-12-27 | 528.57 |
| 26 | 2454646 | 2008-06-28 | 529.07 |
| 27 | 2455161 | 2009-11-25 | 528.5 |
| 28 | 2455702 | 2011-05-20 | 526.65 |
| 29 | 2456218 | 2012-10-17 | 526.15 |
| 30 | 2456763 | 2014-04-15 | 526.72 |
| 31 | 2457264 | 2015-08-29 | 524.86 |
| 32 | 2457781 | 2017-01-27 | 522 |
| 33 | 2458328 | 2018-07-28 | 520.44 |
| 34 | 2458853 | 2020-01-04 | 521.28 |
| 35 | 2459358 | 2021-05-23 | 526.58 |
| 36 | 2459870 | 2022-10-17 | 528.49 |
| 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. |