| E | O (JD) | O (dat) | Period |
| -89 | 2415140 | 1900-04-30 | 303.12 |
| -84 | 2416649 | 1904-06-17 | 303.34 |
| -83 | 2416950 | 1905-04-14 | 303.86 |
| -78 | 2418470 | 1909-06-12 | 302.56 |
| -73 | 2419985 | 1913-08-05 | 301.98 |
| -72 | 2420293 | 1914-06-09 | 301.67 |
| -71 | 2420601 | 1915-04-13 | 301.2 |
| -66 | 2422085 | 1919-05-06 | 300.61 |
| -63 | 2422991 | 1921-10-28 | 300.25 |
| -55 | 2425390 | 1928-05-23 | 300.3 |
| -50 | 2426897 | 1932-07-08 | 300.35 |
| -45 | 2428392 | 1936-08-11 | 300.18 |
| -44 | 2428700 | 1937-06-15 | 300.37 |
| -43 | 2429011 | 1938-04-22 | 300.5 |
| -40 | 2429894 | 1940-09-21 | 300.43 |
| -39 | 2430191 | 1941-07-15 | 300.17 |
| -38 | 2430505 | 1942-05-25 | 298.68 |
| -33 | 2431999 | 1946-06-27 | 298.65 |
| -32 | 2432303 | 1947-04-27 | 299.22 |
| -27 | 2433794 | 1951-05-27 | 298.87 |
| -20 | 2435864 | 1957-01-25 | 298.83 |
| -17 | 2436779 | 1959-07-29 | 299.34 |
| -16 | 2437070 | 1960-05-15 | 299.32 |
| -15 | 2437374 | 1961-03-15 | 299.92 |
| -14 | 2437681 | 1962-01-16 | 301.06 |
| -13 | 2437996 | 1962-11-27 | 301.85 |
| -12 | 2438278 | 1963-09-05 | 302.71 |
| -11 | 2438578 | 1964-07-01 | 301.87 |
| -10 | 2438882 | 1965-05-01 | 301.32 |
| -9 | 2439193 | 1966-03-08 | 303.06 |
| -8 | 2439489 | 1966-12-29 | 304.05 |
| -6 | 2440094 | 1968-08-25 | 303.45 |
| -5 | 2440404 | 1969-07-01 | 303 |
| -2 | 2441325 | 1972-01-08 | 302.67 |
| 0 | 2441916 | 1973-08-21 | 302.48 |
| 1 | 2442220 | 1974-06-21 | 301.41 |
| 2 | 2442521 | 1975-04-18 | 299.88 |
| 5 | 2443425 | 1977-10-08 | 299.4 |
| 6 | 2443720 | 1978-07-30 | 299.25 |
| 7 | 2444012 | 1979-05-18 | 298.96 |
| 11 | 2445214 | 1982-09-01 | 299.28 |
| 12 | 2445512 | 1983-06-26 | 299.5 |
| 13 | 2445806 | 1984-04-15 | 300.2 |
| 14 | 2446110 | 1985-02-13 | 300.94 |
| 15 | 2446420 | 1985-12-20 | 301.22 |
| 16 | 2446715 | 1986-10-11 | 301.72 |
| 17 | 2447021 | 1987-08-13 | 301.35 |
| 18 | 2447321 | 1988-06-08 | 300.07 |
| 19 | 2447622 | 1989-04-05 | 299.43 |
| 20 | 2447920 | 1990-01-28 | 299.22 |
| 21 | 2448215 | 1990-11-19 | 298.36 |
| 22 | 2448516 | 1991-09-16 | 298.35 |
| 23 | 2448811 | 1992-07-07 | 298.57 |
| 24 | 2449114 | 1993-05-06 | 298.72 |
| 25 | 2449405 | 1994-02-21 | 298.58 |
| 26 | 2449715 | 1994-12-28 | 298.64 |
| 27 | 2450007 | 1995-10-16 | 298.71 |
| 28 | 2450310 | 1996-08-14 | 298.21 |
| 29 | 2450601 | 1997-06-01 | 297.86 |
| 30 | 2450907 | 1998-04-03 | 297.94 |
| 31 | 2451200 | 1999-01-21 | 299.07 |
| 32 | 2451494 | 1999-11-11 | 300.28 |
| 33 | 2451796 | 2000-09-08 | 300.35 |
| 34 | 2452097 | 2001-07-06 | 301 |
| 35 | 2452407 | 2002-05-12 | 302.44 |
| 36 | 2452708 | 2003-03-09 | 302.93 |
| 37 | 2453005 | 2003-12-31 | 303.64 |
| 38 | 2453316 | 2004-11-06 | 303.21 |
| 39 | 2453612 | 2005-08-29 | 302.79 |
| 40 | 2453919 | 2006-07-02 | 304.15 |
| 41 | 2454225 | 2007-05-04 | 303.14 |
| 42 | 2454524 | 2008-02-27 | 301.92 |
| 43 | 2454830 | 2008-12-29 | 302.49 |
| 44 | 2455141 | 2009-11-05 | 301.86 |
| 45 | 2455424 | 2010-08-15 | 302.22 |
| 46 | 2455731 | 2011-06-18 | 303.14 |
| 47 | 2456035 | 2012-04-17 | 302.64 |
| 48 | 2456335 | 2013-02-11 | 303.92 |
| 49 | 2456645 | 2013-12-18 | 306 |
| 50 | 2456953 | 2014-10-22 | 305.65 |
| 51 | 2457255 | 2015-08-20 | 305.79 |
| 52 | 2457565 | 2016-06-25 | 304.99 |
| 53 | 2457874 | 2017-04-30 | 303.42 |
| 54 | 2458171 | 2018-02-21 | 303.07 |
| 55 | 2458480 | 2018-12-27 | 302.58 |
| 56 | 2458770 | 2019-10-13 | 301.67 |
| 57 | 2459076 | 2020-08-14 | 301.11 |
| 58 | 2459375 | 2021-06-09 | 300 |
| 59 | 2459681 | 2022-04-11 | 298.2 |
| 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. |