| E | O (JD) | O (dat) | Period |
| -78 | 2400988 | 1861-07-31 | 485.77 |
| -53 | 2413127 | 1894-10-25 | 486.34 |
| -52 | 2413625 | 1896-03-06 | 487.31 |
| -51 | 2414092 | 1897-06-16 | 486.55 |
| -50 | 2414587 | 1898-10-24 | 486.46 |
| -49 | 2415083 | 1900-03-04 | 486.87 |
| -48 | 2415574 | 1901-07-08 | 490.69 |
| -47 | 2416063 | 1902-11-09 | 494.07 |
| -45 | 2417024 | 1905-06-27 | 494.37 |
| -44 | 2417518 | 1906-11-03 | 496.44 |
| -43 | 2418050 | 1908-04-18 | 495.94 |
| -42 | 2418534 | 1909-08-15 | 496.26 |
| -41 | 2419046 | 1911-01-09 | 498.35 |
| -40 | 2419554 | 1912-05-31 | 493.86 |
| -39 | 2420018 | 1913-09-07 | 492.14 |
| -38 | 2420513 | 1915-01-15 | 493.57 |
| -37 | 2421006 | 1916-05-22 | 488.64 |
| -36 | 2421476 | 1917-09-04 | 484.93 |
| -35 | 2421998 | 1919-02-08 | 484.93 |
| -34 | 2422492 | 1920-06-16 | 483.64 |
| -33 | 2422949 | 1921-09-16 | 484.14 |
| -32 | 2423412 | 1922-12-23 | 482.72 |
| -31 | 2423908 | 1924-05-02 | 478.86 |
| -30 | 2424382 | 1925-08-19 | 481 |
| -29 | 2424878 | 1926-12-28 | 486.14 |
| -28 | 2425354 | 1928-04-17 | 487.99 |
| -27 | 2425840 | 1929-08-16 | 486.64 |
| -26 | 2426335 | 1930-12-24 | 486.29 |
| -25 | 2426832 | 1932-05-04 | 489.79 |
| -24 | 2427320 | 1933-09-04 | 493.93 |
| -23 | 2427783 | 1934-12-11 | 494.72 |
| -22 | 2428285 | 1936-04-26 | 493.43 |
| -21 | 2428804 | 1937-09-27 | 493.22 |
| -20 | 2429305 | 1939-02-10 | 495.5 |
| -19 | 2429796 | 1940-06-15 | 495.86 |
| -18 | 2430279 | 1941-10-11 | 493.22 |
| -17 | 2430778 | 1943-02-22 | 490.93 |
| -16 | 2431262 | 1944-06-20 | 489.72 |
| -15 | 2431748 | 1945-10-19 | 490.29 |
| -14 | 2432246 | 1947-03-01 | 490.72 |
| -13 | 2432736 | 1948-07-03 | 489.86 |
| -12 | 2433221 | 1949-10-31 | 490.21 |
| -11 | 2433718 | 1951-03-12 | 490.14 |
| -10 | 2434209 | 1952-07-15 | 490.43 |
| -9 | 2434689 | 1953-11-07 | 491.07 |
| -8 | 2435184 | 1955-03-17 | 490.14 |
| -7 | 2435672 | 1956-07-17 | 488.36 |
| -6 | 2436176 | 1957-12-03 | 489.64 |
| -5 | 2436656 | 1959-03-28 | 490.86 |
| -4 | 2437145 | 1960-07-29 | 490.36 |
| -3 | 2437619 | 1961-11-15 | 489.07 |
| -2 | 2438134 | 1963-04-14 | 487.43 |
| -1 | 2438611 | 1964-08-03 | 487.93 |
| 0 | 2439110 | 1965-12-15 | 486.64 |
| 1 | 2439585 | 1967-04-04 | 483.57 |
| 2 | 2440071 | 1968-08-02 | 481.86 |
| 3 | 2440561 | 1969-12-05 | 481.36 |
| 4 | 2441016 | 1971-03-05 | 480.14 |
| 5 | 2441507 | 1972-07-08 | 480.93 |
| 6 | 2441984 | 1973-10-28 | 479.86 |
| 7 | 2442476 | 1975-03-04 | 481.72 |
| 8 | 2442941 | 1976-06-11 | 485.14 |
| 9 | 2443448 | 1977-10-31 | 484.85 |
| 10 | 2443902 | 1979-01-28 | 486.22 |
| 11 | 2444419 | 1980-06-28 | 488.35 |
| 12 | 2444896 | 1981-10-18 | 487.92 |
| 13 | 2445383 | 1983-02-17 | 490.07 |
| 14 | 2445884 | 1984-07-02 | 491.64 |
| 15 | 2446370 | 1985-10-31 | 489.57 |
| 16 | 2446850 | 1987-02-23 | 490.72 |
| 17 | 2447361 | 1988-07-18 | 490.43 |
| 18 | 2447843 | 1989-11-12 | 487.29 |
| 19 | 2448326 | 1991-03-10 | 488.07 |
| 20 | 2448823 | 1992-07-19 | 486.22 |
| 21 | 2449310 | 1993-11-18 | 481.85 |
| 22 | 2449766 | 1995-02-17 | 481.49 |
| 23 | 2450287 | 1996-07-22 | 481 |
| 24 | 2450731 | 1997-10-09 | 479.93 |
| 25 | 2451219 | 1999-02-09 | 481.86 |
| 26 | 2451691 | 2000-05-26 | 482.43 |
| 27 | 2452192 | 2001-10-09 | 481.72 |
| 28 | 2452660 | 2003-01-20 | 483.36 |
| 29 | 2453162 | 2004-06-05 | 483.72 |
| 30 | 2453645 | 2005-10-01 | 484.64 |
| 31 | 2454117 | 2007-01-16 | 485.86 |
| 32 | 2454600 | 2008-05-13 | 485.5 |
| 33 | 2455082 | 2009-09-07 | 485.79 |
| 34 | 2455586 | 2011-01-24 | 490 |
| 35 | 2456068 | 2012-05-20 | 494.72 |
| 36 | 2456551 | 2013-09-15 | 494.43 |
| 37 | 2457057 | 2015-02-03 | 493.36 |
| 38 | 2457565 | 2016-06-25 | 496.14 |
| 39 | 2458078 | 2017-11-20 | 498.69 |
| 40 | 2458526 | 2019-02-11 | 499.94 |
| 41 | 2459049 | 2020-07-18 | 496.65 |
| 42 | 2459551 | 2021-12-02 | 494.38 |
| 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. |