| E | O (JD) | O (dat) | Period |
| -49 | 2415009 | 1899-12-20 | 547.56 |
| -47 | 2416141 | 1903-01-26 | 547.53 |
| -46 | 2416749 | 1904-09-25 | 547.13 |
| -37 | 2421660 | 1918-03-07 | 548.19 |
| -34 | 2423276 | 1922-08-09 | 548.17 |
| -33 | 2423823 | 1924-02-07 | 546.03 |
| -32 | 2424363 | 1925-07-31 | 544.46 |
| -31 | 2424890 | 1927-01-09 | 546.88 |
| -30 | 2425446 | 1928-07-18 | 552.93 |
| -29 | 2426009 | 1930-02-01 | 557.36 |
| -28 | 2426556 | 1931-08-02 | 565.5 |
| -27 | 2427130 | 1933-02-26 | 576.5 |
| -26 | 2427710 | 1934-09-29 | 581.14 |
| -25 | 2428279 | 1936-04-20 | 585.43 |
| -24 | 2428891 | 1937-12-23 | 589.21 |
| -23 | 2429516 | 1939-09-09 | 595.53 |
| -22 | 2430075 | 1941-03-21 | 604.13 |
| -21 | 2430686 | 1942-11-22 | 603.81 |
| -20 | 2431249 | 1944-06-07 | 600.37 |
| -18 | 2432524 | 1947-12-04 | 601.19 |
| -17 | 2433131 | 1949-08-02 | 599.88 |
| -16 | 2433700 | 1951-02-22 | 599.5 |
| -15 | 2434313 | 1952-10-27 | 594.53 |
| -14 | 2434897 | 1954-06-03 | 584.14 |
| -13 | 2435462 | 1955-12-20 | 582.21 |
| -12 | 2436065 | 1957-08-14 | 578.21 |
| -11 | 2436626 | 1959-02-26 | 573 |
| -10 | 2437207 | 1960-09-29 | 570.64 |
| -9 | 2437775 | 1962-04-20 | 564.5 |
| -8 | 2438333 | 1963-10-30 | 558.14 |
| -7 | 2438899 | 1965-05-18 | 555.86 |
| -6 | 2439449 | 1966-11-19 | 550.29 |
| -5 | 2439981 | 1968-05-04 | 546.43 |
| -4 | 2440524 | 1969-10-29 | 544.5 |
| -3 | 2441091 | 1971-05-19 | 542 |
| -2 | 2441595 | 1972-10-04 | 542.43 |
| -1 | 2442163 | 1974-04-25 | 544.57 |
| 0 | 2442692 | 1975-10-06 | 544.43 |
| 1 | 2443244 | 1977-04-10 | 546.86 |
| 2 | 2443780 | 1978-09-28 | 550.21 |
| 3 | 2444349 | 1980-04-19 | 552.29 |
| 4 | 2444888 | 1981-10-10 | 557.07 |
| 5 | 2445454 | 1983-04-29 | 561 |
| 6 | 2446007 | 1984-11-02 | 563.79 |
| 7 | 2446580 | 1986-05-29 | 567.79 |
| 8 | 2447155 | 1987-12-25 | 572.14 |
| 9 | 2447723 | 1989-07-15 | 575.21 |
| 10 | 2448299 | 1991-02-11 | 579.93 |
| 11 | 2448887 | 1992-09-21 | 582.71 |
| 12 | 2449465 | 1994-04-22 | 585.79 |
| 13 | 2450049 | 1995-11-27 | 590.07 |
| 14 | 2450657 | 1997-07-27 | 592 |
| 15 | 2451236 | 1999-02-26 | 596.36 |
| 16 | 2451843 | 2000-10-25 | 602 |
| 17 | 2452440 | 2002-06-14 | 603 |
| 18 | 2453034 | 2004-01-29 | 604.14 |
| 19 | 2453667 | 2005-10-23 | 602.86 |
| 20 | 2454275 | 2007-06-23 | 600.21 |
| 21 | 2454873 | 2009-02-10 | 602.29 |
| 22 | 2455478 | 2010-10-08 | 597.21 |
| 23 | 2456041 | 2012-04-23 | 590 |
| 24 | 2456645 | 2013-12-18 | 586.86 |
| 25 | 2457261 | 2015-08-26 | 581.43 |
| 26 | 2457801 | 2017-02-16 | 581.79 |
| 27 | 2458401 | 2018-10-09 | 585.09 |
| 28 | 2458963 | 2020-04-23 | 573.42 |
| 29 | 2459528 | 2021-11-09 | 564.9 |
| 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. |