| E | O (JD) | O (dat) | Period |
| -46 | 2417950 | 1908-01-09 | 454.23 |
| -42 | 2419760 | 1912-12-23 | 443.79 |
| -41 | 2420220 | 1914-03-28 | 439.78 |
| -40 | 2420685 | 1915-07-06 | 438.02 |
| -39 | 2421130 | 1916-09-23 | 436.25 |
| -29 | 2425500 | 1928-09-10 | 433.47 |
| -27 | 2426360 | 1931-01-18 | 431.63 |
| -21 | 2428890 | 1937-12-22 | 430.48 |
| -19 | 2429760 | 1940-05-10 | 429.79 |
| -15 | 2431460 | 1945-01-04 | 430.47 |
| -14 | 2431890 | 1946-03-10 | 435 |
| -13 | 2432310 | 1947-05-04 | 441.7 |
| -8 | 2434520 | 1953-05-22 | 445.25 |
| -5 | 2435850 | 1957-01-11 | 447.73 |
| -1 | 2437670 | 1962-01-05 | 449 |
| 8 | 2441740 | 1973-02-26 | 450.44 |
| 9 | 2442188 | 1974-05-20 | 451.52 |
| 13 | 2443996 | 1979-05-02 | 450.8 |
| 15 | 2444899 | 1981-10-21 | 449.2 |
| 16 | 2445354 | 1983-01-19 | 447 |
| 17 | 2445786 | 1984-03-26 | 444.84 |
| 18 | 2446217 | 1985-05-31 | 441.73 |
| 19 | 2446669 | 1986-08-26 | 439.36 |
| 20 | 2447093 | 1987-10-24 | 439 |
| 21 | 2447543 | 1989-01-16 | 440.64 |
| 22 | 2447978 | 1990-03-27 | 440.43 |
| 23 | 2448426 | 1991-06-18 | 440.71 |
| 24 | 2448860 | 1992-08-25 | 441.79 |
| 25 | 2449312 | 1993-11-20 | 441.64 |
| 26 | 2449740 | 1995-01-22 | 442.57 |
| 27 | 2450192 | 1996-04-18 | 443.29 |
| 28 | 2450629 | 1997-06-29 | 443.57 |
| 29 | 2451075 | 1998-09-18 | 444.14 |
| 30 | 2451525 | 1999-12-12 | 445.07 |
| 31 | 2451967 | 2001-02-26 | 444.64 |
| 32 | 2452415 | 2002-05-20 | 445 |
| 33 | 2452855 | 2003-08-03 | 446.29 |
| 34 | 2453308 | 2004-10-29 | 446.71 |
| 35 | 2453738 | 2006-01-02 | 445.47 |
| 36 | 2454196 | 2007-04-05 | 445.29 |
| 37 | 2454652 | 2008-07-04 | 444.83 |
| 38 | 2455094 | 2009-09-19 | 445.44 |
| 40 | 2455970 | 2012-02-12 | 446.22 |
| 42 | 2456870 | 2014-07-31 | 444.28 |
| 43 | 2457300 | 2015-10-04 | 442.67 |
| 44 | 2457764 | 2017-01-10 | 441.35 |
| 45 | 2458202 | 2018-03-24 | 438.67 |
| 46 | 2458643 | 2019-06-08 | 438.48 |
| 47 | 2459071 | 2020-08-09 | 438.63 |
| 48 | 2459496 | 2021-10-08 | 433.5 |
| 49 | 2459924 | 2022-12-10 | 432.6 |
| 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. |