| E | O (JD) | O (dat) | Period |
| -65 | 2411531 | 1890-06-12 | 442.16 |
| -61 | 2413245 | 1895-02-20 | 443.24 |
| -56 | 2415469 | 1901-03-25 | 443.2 |
| -55 | 2415901 | 1902-05-31 | 442.1 |
| -53 | 2416800 | 1904-11-15 | 442.47 |
| -51 | 2417700 | 1907-05-04 | 443.03 |
| -47 | 2419456 | 1912-02-23 | 444.9 |
| -46 | 2419930 | 1913-06-11 | 446.23 |
| -42 | 2421660 | 1918-03-07 | 446.1 |
| -41 | 2422117 | 1919-06-07 | 447.72 |
| -39 | 2423045 | 1921-12-21 | 448.45 |
| -38 | 2423489 | 1923-03-10 | 450.84 |
| -37 | 2423948 | 1924-06-11 | 455.69 |
| -36 | 2424401 | 1925-09-07 | 454.73 |
| -35 | 2424851 | 1926-12-01 | 452.86 |
| -34 | 2425305 | 1928-02-28 | 452.86 |
| -33 | 2425763 | 1929-05-31 | 453.07 |
| -32 | 2426220 | 1930-08-31 | 451.86 |
| -31 | 2426654 | 1931-11-08 | 450.29 |
| -30 | 2427123 | 1933-02-19 | 447.57 |
| -29 | 2427569 | 1934-05-11 | 445.14 |
| -28 | 2428009 | 1935-07-25 | 445.5 |
| -27 | 2428451 | 1936-10-09 | 441.64 |
| -26 | 2428883 | 1937-12-15 | 437.21 |
| -25 | 2429332 | 1939-03-09 | 437 |
| -24 | 2429779 | 1940-05-29 | 437.71 |
| -23 | 2430181 | 1941-07-05 | 440.29 |
| -22 | 2430632 | 1942-09-29 | 440.14 |
| -21 | 2431064 | 1943-12-05 | 437.86 |
| -20 | 2431524 | 1945-03-09 | 440.21 |
| -19 | 2431974 | 1946-06-02 | 442.21 |
| -18 | 2432403 | 1947-08-05 | 441 |
| -17 | 2432838 | 1948-10-13 | 439.71 |
| -16 | 2433285 | 1950-01-03 | 438.36 |
| -15 | 2433719 | 1951-03-13 | 439.43 |
| -14 | 2434151 | 1952-05-18 | 441.36 |
| -13 | 2434593 | 1953-08-03 | 442.79 |
| -12 | 2435042 | 1954-10-26 | 444.21 |
| -11 | 2435487 | 1956-01-14 | 446.07 |
| -10 | 2435933 | 1957-04-04 | 447.86 |
| -9 | 2436389 | 1958-07-04 | 449 |
| -8 | 2436834 | 1959-09-22 | 450.21 |
| -7 | 2437281 | 1960-12-12 | 451.57 |
| -6 | 2437733 | 1962-03-09 | 449.71 |
| -5 | 2438188 | 1963-06-07 | 448.57 |
| -4 | 2438644 | 1964-09-05 | 450.21 |
| -3 | 2439098 | 1965-12-03 | 449.93 |
| -2 | 2439520 | 1967-01-29 | 448.07 |
| -1 | 2439983 | 1968-05-06 | 445.93 |
| 0 | 2440435 | 1969-08-01 | 443.93 |
| 1 | 2440878 | 1970-10-18 | 443.79 |
| 2 | 2441316 | 1971-12-30 | 442.93 |
| 3 | 2441759 | 1973-03-17 | 441.43 |
| 4 | 2442198 | 1974-05-30 | 441.14 |
| 5 | 2442633 | 1975-08-08 | 441.14 |
| 6 | 2443071 | 1976-10-19 | 442.5 |
| 7 | 2443527 | 1978-01-18 | 443.71 |
| 8 | 2443962 | 1979-03-29 | 444.71 |
| 9 | 2444408 | 1980-06-17 | 445.64 |
| 10 | 2444862 | 1981-09-14 | 445.43 |
| 11 | 2445307 | 1982-12-03 | 445 |
| 12 | 2445750 | 1984-02-19 | 445.29 |
| 13 | 2446193 | 1985-05-07 | 445.64 |
| 14 | 2446641 | 1986-07-29 | 445.43 |
| 15 | 2447078 | 1987-10-09 | 444.93 |
| 16 | 2447526 | 1988-12-30 | 444.36 |
| 17 | 2447983 | 1990-04-01 | 444.36 |
| 18 | 2448422 | 1991-06-14 | 445.86 |
| 19 | 2448864 | 1992-08-29 | 446.36 |
| 20 | 2449300 | 1993-11-08 | 446.21 |
| 21 | 2449755 | 1995-02-06 | 446.86 |
| 22 | 2450206 | 1996-05-02 | 446.14 |
| 23 | 2450647 | 1997-07-17 | 446.64 |
| 24 | 2451109 | 1998-10-22 | 447.21 |
| 25 | 2451552 | 2000-01-08 | 445.93 |
| 26 | 2451980 | 2001-03-11 | 445.5 |
| 27 | 2452437 | 2002-06-11 | 444 |
| 28 | 2452879 | 2003-08-27 | 443.43 |
| 29 | 2453325 | 2004-11-15 | 445.93 |
| 30 | 2453765 | 2006-01-29 | 447.07 |
| 31 | 2454207 | 2007-04-16 | 446.93 |
| 32 | 2454662 | 2008-07-14 | 444.86 |
| 33 | 2455113 | 2009-10-08 | 443.14 |
| 34 | 2455563 | 2011-01-01 | 444.5 |
| 35 | 2456010 | 2012-03-23 | 442.64 |
| 36 | 2456422 | 2013-05-09 | 439.57 |
| 37 | 2456872 | 2014-08-02 | 437.93 |
| 38 | 2457323 | 2015-10-27 | 436.5 |
| 39 | 2457743 | 2016-12-20 | 437.93 |
| 40 | 2458186 | 2018-03-08 | 439.24 |
| 41 | 2458621 | 2019-05-17 | 435.74 |
| 42 | 2459063 | 2020-08-01 | 436.5 |
| 43 | 2459500 | 2021-10-12 | 439.8 |
| 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. |