| E | O (JD) | O (dat) | Period |
| -51 | 2415680 | 1901-10-22 | 548.9 |
| -50 | 2416196 | 1903-03-22 | 559.15 |
| -49 | 2416762 | 1904-10-08 | 561.26 |
| -48 | 2417313 | 1906-04-12 | 559.83 |
| -47 | 2417860 | 1907-10-11 | 559.31 |
| -35 | 2424621 | 1926-04-15 | 559.5 |
| -34 | 2425180 | 1927-10-26 | 560.03 |
| -33 | 2425740 | 1929-05-08 | 561.14 |
| -32 | 2426271 | 1930-10-21 | 560.56 |
| -31 | 2426829 | 1932-05-01 | 558.21 |
| -30 | 2427407 | 1933-11-30 | 558.07 |
| -29 | 2427967 | 1935-06-13 | 559.29 |
| -28 | 2428528 | 1936-12-25 | 561.79 |
| -27 | 2429088 | 1938-07-08 | 561.29 |
| -26 | 2429645 | 1940-01-16 | 560.07 |
| -25 | 2430196 | 1941-07-20 | 559.5 |
| -24 | 2430769 | 1943-02-13 | 559.5 |
| -23 | 2431325 | 1944-08-22 | 561.14 |
| -22 | 2431890 | 1946-03-10 | 563.14 |
| -21 | 2432438 | 1947-09-09 | 565.86 |
| -20 | 2433011 | 1949-04-04 | 568.14 |
| -19 | 2433578 | 1950-10-23 | 571.29 |
| -18 | 2434147 | 1952-05-14 | 576.14 |
| -17 | 2434740 | 1953-12-28 | 578.36 |
| -16 | 2435308 | 1955-07-19 | 578.93 |
| -15 | 2435905 | 1957-03-07 | 580 |
| -14 | 2436489 | 1958-10-12 | 578.57 |
| -13 | 2437057 | 1960-05-02 | 577.36 |
| -12 | 2437637 | 1961-12-03 | 572.79 |
| -11 | 2438208 | 1963-06-27 | 569.29 |
| -10 | 2438779 | 1965-01-18 | 568.29 |
| -9 | 2439352 | 1966-08-14 | 566.21 |
| -8 | 2439880 | 1968-01-24 | 565.29 |
| -7 | 2440484 | 1969-09-19 | 563.71 |
| -6 | 2441018 | 1971-03-07 | 563 |
| -5 | 2441603 | 1972-10-12 | 565.71 |
| -4 | 2442156 | 1974-04-18 | 566.21 |
| -3 | 2442723 | 1975-11-06 | 565.57 |
| -2 | 2443290 | 1977-05-26 | 567.29 |
| -1 | 2443862 | 1978-12-19 | 568.14 |
| 0 | 2444429 | 1980-07-08 | 569.07 |
| 1 | 2444991 | 1982-01-21 | 567.71 |
| 2 | 2445572 | 1983-08-25 | 565.79 |
| 3 | 2446141 | 1985-03-16 | 565.21 |
| 4 | 2446705 | 1986-10-01 | 566.14 |
| 5 | 2447256 | 1988-04-04 | 566.93 |
| 6 | 2447817 | 1989-10-17 | 566.21 |
| 7 | 2448387 | 1991-05-10 | 565.21 |
| 8 | 2448959 | 1992-12-02 | 566.14 |
| 9 | 2449541 | 1994-07-07 | 567.79 |
| 10 | 2450099 | 1996-01-16 | 568.43 |
| 11 | 2450660 | 1997-07-30 | 569 |
| 12 | 2451227 | 1999-02-17 | 568.29 |
| 13 | 2451795 | 2000-09-07 | 567.93 |
| 14 | 2452367 | 2002-04-02 | 570.36 |
| 15 | 2452945 | 2003-11-01 | 573.21 |
| 16 | 2453511 | 2005-05-20 | 574.71 |
| 17 | 2454080 | 2006-12-10 | 574.86 |
| 18 | 2454664 | 2008-07-16 | 575.29 |
| 19 | 2455248 | 2010-02-20 | 576.29 |
| 20 | 2455820 | 2011-09-15 | 578.36 |
| 21 | 2456390 | 2013-04-07 | 579.29 |
| 22 | 2456976 | 2014-11-14 | 578.07 |
| 23 | 2457548 | 2016-06-08 | 577.86 |
| 24 | 2458140 | 2018-01-21 | 579.02 |
| 25 | 2458714 | 2019-08-18 | 579.71 |
| 26 | 2459291 | 2021-03-17 | 580.33 |
| 27 | 2459867 | 2022-10-14 | 582 |
| 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. |