| E | O (JD) | O (dat) | Period |
| -70 | 2401020 | 1861-09-01 | 620.85 |
| -69 | 2401613 | 1863-04-17 | 618.57 |
| -67 | 2402837 | 1866-08-23 | 613.63 |
| -66 | 2403464 | 1868-05-11 | 610.51 |
| -65 | 2404096 | 1870-02-02 | 610 |
| -64 | 2404701 | 1871-09-30 | 608.58 |
| -62 | 2405911 | 1875-01-22 | 605.61 |
| -60 | 2407120 | 1878-05-15 | 602.72 |
| -59 | 2407713 | 1879-12-29 | 602.05 |
| -58 | 2408300 | 1881-08-07 | 603.64 |
| -57 | 2408902 | 1883-04-01 | 601.86 |
| -56 | 2409507 | 1884-11-26 | 601.57 |
| -55 | 2410127 | 1886-08-08 | 607.79 |
| -54 | 2410747 | 1888-04-19 | 610.64 |
| -53 | 2411312 | 1889-11-05 | 614.07 |
| -52 | 2411943 | 1891-07-29 | 619.22 |
| -51 | 2412579 | 1893-04-25 | 619.07 |
| -50 | 2413172 | 1894-12-09 | 619.36 |
| -49 | 2413834 | 1896-10-01 | 620.36 |
| -48 | 2414469 | 1898-06-28 | 619.93 |
| -47 | 2415072 | 1900-02-21 | 618.5 |
| -46 | 2415658 | 1901-09-30 | 614.36 |
| -45 | 2416282 | 1903-06-16 | 608.86 |
| -44 | 2416919 | 1905-03-14 | 608.22 |
| -43 | 2417491 | 1906-10-07 | 613.79 |
| -42 | 2418116 | 1908-06-23 | 613.99 |
| -41 | 2418711 | 1910-02-08 | 610.78 |
| -40 | 2419345 | 1911-11-04 | 614.36 |
| -39 | 2419978 | 1913-07-29 | 616.71 |
| -38 | 2420558 | 1915-03-01 | 616.49 |
| -37 | 2421194 | 1916-11-26 | 614.93 |
| -36 | 2421817 | 1918-08-11 | 613.36 |
| -35 | 2422424 | 1920-04-09 | 616.07 |
| -34 | 2423034 | 1921-12-10 | 614.93 |
| -33 | 2423631 | 1923-07-30 | 613.14 |
| -32 | 2424279 | 1925-05-08 | 613.57 |
| -31 | 2424882 | 1927-01-01 | 612.93 |
| -30 | 2425479 | 1928-08-20 | 613.43 |
| -29 | 2426116 | 1930-05-19 | 610.85 |
| -28 | 2426715 | 1932-01-08 | 607.49 |
| -27 | 2427324 | 1933-09-08 | 606.64 |
| -26 | 2427929 | 1935-05-06 | 604.07 |
| -25 | 2428533 | 1936-12-30 | 600.93 |
| -24 | 2429133 | 1938-08-22 | 600.14 |
| -23 | 2429721 | 1940-04-01 | 602.22 |
| -22 | 2430331 | 1941-12-02 | 602.43 |
| -21 | 2430913 | 1943-07-07 | 602.5 |
| -20 | 2431528 | 1945-03-13 | 604.43 |
| -19 | 2432156 | 1946-12-01 | 607.22 |
| -18 | 2432740 | 1948-07-07 | 611.07 |
| -17 | 2433361 | 1950-03-20 | 616.22 |
| -16 | 2433955 | 1951-11-04 | 617 |
| -15 | 2434598 | 1953-08-08 | 617.36 |
| -14 | 2435201 | 1955-04-03 | 620.14 |
| -13 | 2435867 | 1957-01-28 | 621.14 |
| -12 | 2436455 | 1958-09-08 | 619.92 |
| -11 | 2437084 | 1960-05-29 | 618.57 |
| -10 | 2437699 | 1962-02-03 | 617.22 |
| -9 | 2438313 | 1963-10-10 | 615.14 |
| -8 | 2438919 | 1965-06-07 | 616.42 |
| -7 | 2439540 | 1967-02-18 | 617.22 |
| -6 | 2440169 | 1968-11-08 | 617.29 |
| -5 | 2440765 | 1970-06-27 | 618.57 |
| -4 | 2441404 | 1972-03-27 | 618.43 |
| -3 | 2442020 | 1973-12-03 | 615.14 |
| -2 | 2442634 | 1975-08-09 | 615.93 |
| -1 | 2443258 | 1977-04-24 | 616.93 |
| 0 | 2443859 | 1978-12-16 | 614.43 |
| 1 | 2444462 | 1980-08-10 | 614 |
| 2 | 2445095 | 1982-05-05 | 613.29 |
| 3 | 2445711 | 1984-01-11 | 612 |
| 4 | 2446315 | 1985-09-06 | 614.07 |
| 5 | 2446935 | 1987-05-19 | 614.79 |
| 6 | 2447543 | 1989-01-16 | 613.29 |
| 7 | 2448142 | 1990-09-07 | 614 |
| 8 | 2448776 | 1992-06-02 | 612.28 |
| 9 | 2449388 | 1994-02-04 | 611.85 |
| 10 | 2450004 | 1995-10-13 | 615.36 |
| 11 | 2450618 | 1997-06-18 | 613.78 |
| 12 | 2451204 | 1999-01-25 | 611.64 |
| 13 | 2451840 | 2000-10-22 | 612.57 |
| 14 | 2452460 | 2002-07-04 | 612.5 |
| 15 | 2453051 | 2004-02-15 | 612.14 |
| 16 | 2453676 | 2005-11-01 | 610.79 |
| 17 | 2454292 | 2007-07-10 | 609.29 |
| 18 | 2454905 | 2009-03-14 | 609.64 |
| 19 | 2455487 | 2010-10-17 | 611.86 |
| 20 | 2456108 | 2012-06-29 | 610.86 |
| 21 | 2456722 | 2014-03-05 | 609.07 |
| 22 | 2457324 | 2015-10-28 | 612.35 |
| 23 | 2457969 | 2017-08-03 | 614.49 |
| 24 | 2458551 | 2019-03-08 | 613.36 |
| 25 | 2459173 | 2020-11-19 | 616.08 |
| 26 | 2459792 | 2022-07-31 | 618.91 |
| 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. |