| E | O (JD) | O (dat) | Period |
| -72 | 2406371 | 1876-04-26 | 487.91 |
| -71 | 2406844 | 1877-08-12 | 487.63 |
| -58 | 2413201 | 1895-01-07 | 487.51 |
| -57 | 2413682 | 1896-05-02 | 487.34 |
| -56 | 2414160 | 1897-08-23 | 487.19 |
| -55 | 2414664 | 1899-01-09 | 487.25 |
| -54 | 2415131 | 1900-04-21 | 487.49 |
| -53 | 2415623 | 1901-08-26 | 486.08 |
| -52 | 2416104 | 1902-12-20 | 487.56 |
| -51 | 2416590 | 1904-04-19 | 487.37 |
| -50 | 2417090 | 1905-09-01 | 486.89 |
| -48 | 2418065 | 1908-05-03 | 487.38 |
| -47 | 2418539 | 1909-08-20 | 487.16 |
| -45 | 2419541 | 1912-05-18 | 487.67 |
| -44 | 2420001 | 1913-08-21 | 487.61 |
| -43 | 2420486 | 1914-12-19 | 487.47 |
| -42 | 2420980 | 1916-04-26 | 487.73 |
| -41 | 2421466 | 1917-08-25 | 488.49 |
| -40 | 2421970 | 1919-01-11 | 488.27 |
| -39 | 2422450 | 1920-05-05 | 489.49 |
| -38 | 2422940 | 1921-09-07 | 489.95 |
| -37 | 2423423 | 1923-01-03 | 490.19 |
| -36 | 2423921 | 1924-05-15 | 490.54 |
| -35 | 2424404 | 1925-09-10 | 490.77 |
| -34 | 2424894 | 1927-01-13 | 491.85 |
| -33 | 2425396 | 1928-05-29 | 492.92 |
| -32 | 2425888 | 1929-10-03 | 493.94 |
| -31 | 2426378 | 1931-02-05 | 494.94 |
| -30 | 2426872 | 1932-06-13 | 496.63 |
| -29 | 2427367 | 1933-10-21 | 497.47 |
| -28 | 2427870 | 1935-03-08 | 498.22 |
| -27 | 2428365 | 1936-07-15 | 499.22 |
| -26 | 2428870 | 1937-12-02 | 500.27 |
| -25 | 2429377 | 1939-04-23 | 500.46 |
| -24 | 2429870 | 1940-08-28 | 500.05 |
| -23 | 2430373 | 1942-01-13 | 499.45 |
| -22 | 2430872 | 1943-05-27 | 498.31 |
| -21 | 2431378 | 1944-10-14 | 496.26 |
| -20 | 2431869 | 1946-02-17 | 494.49 |
| -19 | 2432361 | 1947-06-24 | 493.4 |
| -18 | 2432861 | 1948-11-05 | 492.51 |
| -17 | 2433344 | 1950-03-03 | 492.21 |
| -16 | 2433825 | 1951-06-27 | 492.1 |
| -15 | 2434317 | 1952-10-31 | 493.16 |
| -14 | 2434813 | 1954-03-11 | 494.55 |
| -13 | 2435313 | 1955-07-24 | 496.14 |
| -12 | 2435811 | 1956-12-03 | 498.41 |
| -11 | 2436304 | 1958-04-10 | 500.79 |
| -10 | 2436809 | 1959-08-28 | 502.15 |
| -9 | 2437313 | 1961-01-13 | 503.94 |
| -8 | 2437816 | 1962-05-31 | 505.82 |
| -7 | 2438322 | 1963-10-19 | 507.3 |
| -6 | 2438837 | 1965-03-17 | 507.43 |
| -5 | 2439336 | 1966-07-29 | 506.5 |
| -4 | 2439857 | 1968-01-01 | 504.47 |
| -3 | 2440372 | 1969-05-30 | 501.61 |
| -2 | 2440875 | 1970-10-15 | 497.69 |
| -1 | 2441360 | 1972-02-12 | 494.83 |
| 0 | 2441855 | 1973-06-21 | 492.01 |
| 1 | 2442335 | 1974-10-14 | 489.1 |
| 2 | 2442817 | 1976-02-08 | 487.13 |
| 3 | 2443291 | 1977-05-27 | 485.98 |
| 4 | 2443802 | 1978-10-20 | 485.75 |
| 5 | 2444281 | 1980-02-11 | 485.66 |
| 6 | 2444769 | 1981-06-13 | 486.96 |
| 7 | 2445251 | 1982-10-08 | 488.82 |
| 8 | 2445730 | 1984-01-30 | 490.67 |
| 9 | 2446218 | 1985-06-01 | 492.35 |
| 10 | 2446708 | 1986-10-04 | 495.86 |
| 11 | 2447214 | 1988-02-22 | 499.81 |
| 12 | 2447722 | 1989-07-14 | 503.23 |
| 13 | 2448221 | 1990-11-25 | 507.55 |
| 14 | 2448729 | 1992-04-16 | 509.84 |
| 15 | 2449244 | 1993-09-13 | 511.25 |
| 16 | 2449767 | 1995-02-18 | 510.51 |
| 17 | 2450267 | 1996-07-02 | 509.61 |
| 18 | 2450808 | 1997-12-25 | 507.97 |
| 19 | 2451300 | 1999-05-01 | 504.95 |
| 20 | 2451809 | 2000-09-21 | 501.93 |
| 21 | 2452292 | 2002-01-17 | 499.36 |
| 22 | 2452798 | 2003-06-07 | 496.82 |
| 23 | 2453289 | 2004-10-10 | 495.85 |
| 24 | 2453773 | 2006-02-06 | 496.94 |
| 25 | 2454274 | 2007-06-22 | 497.52 |
| 26 | 2454775 | 2008-11-04 | 498.77 |
| 27 | 2455254 | 2010-02-26 | 499.77 |
| 28 | 2455786 | 2011-08-12 | 501.26 |
| 29 | 2456286 | 2012-12-24 | 501.82 |
| 30 | 2456780 | 2014-05-02 | 502.16 |
| 31 | 2457280 | 2015-09-14 | 502.15 |
| 32 | 2457789 | 2017-02-04 | 502.37 |
| 33 | 2458292 | 2018-06-22 | 500.83 |
| 34 | 2458781 | 2019-10-24 | 501.15 |
| 35 | 2459294 | 2021-03-20 | 501.68 |
| 36 | 2459789 | 2022-07-28 | 501.4 |
| 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. |