| E | O (JD) | O (dat) | Period |
| -38 | 2415290 | 1900-09-27 | 251.42 |
| -35 | 2416055 | 1902-11-01 | 251.67 |
| -34 | 2416303 | 1903-07-07 | 251.79 |
| -32 | 2416807 | 1904-11-22 | 251.5 |
| -31 | 2417063 | 1905-08-05 | 251.26 |
| -28 | 2417803 | 1907-08-15 | 251.18 |
| -25 | 2418569 | 1909-09-19 | 251.03 |
| -22 | 2419325 | 1911-10-15 | 251.1 |
| -19 | 2420070 | 1913-10-29 | 250.72 |
| -16 | 2420820 | 1915-11-18 | 250.66 |
| -13 | 2421575 | 1917-12-12 | 250.53 |
| -12 | 2421830 | 1918-08-24 | 249.92 |
| -9 | 2422585 | 1920-09-17 | 249.48 |
| -6 | 2423315 | 1922-09-17 | 249.38 |
| -4 | 2423830 | 1924-02-14 | 249.15 |
| -3 | 2424071 | 1924-10-12 | 249.11 |
| -1 | 2424560 | 1926-02-13 | 248.68 |
| 0 | 2424804 | 1926-10-15 | 248.64 |
| 2 | 2425315 | 1928-03-09 | 248.82 |
| 3 | 2425565 | 1928-11-14 | 249 |
| 4 | 2425825 | 1929-08-01 | 249.67 |
| 7 | 2426550 | 1931-07-27 | 249.8 |
| 9 | 2427055 | 1932-12-13 | 249.97 |
| 10 | 2427300 | 1933-08-15 | 250.02 |
| 12 | 2427815 | 1935-01-12 | 250.69 |
| 13 | 2428067 | 1935-09-21 | 251.44 |
| 15 | 2428555 | 1937-01-21 | 252.94 |
| 16 | 2428817 | 1937-10-10 | 253.4 |
| 17 | 2429072 | 1938-06-22 | 253.3 |
| 18 | 2429335 | 1939-03-12 | 253.03 |
| 19 | 2429587 | 1939-11-19 | 252.55 |
| 20 | 2429837 | 1940-07-26 | 252.84 |
| 21 | 2430095 | 1941-04-10 | 252.57 |
| 22 | 2430333 | 1941-12-04 | 252.21 |
| 23 | 2430591 | 1942-08-19 | 251.79 |
| 25 | 2431083 | 1943-12-24 | 251.76 |
| 26 | 2431350 | 1944-09-16 | 251.62 |
| 27 | 2431609 | 1945-06-02 | 251.7 |
| 28 | 2431853 | 1946-02-01 | 252.52 |
| 29 | 2432102 | 1946-10-08 | 251.98 |
| 30 | 2432352 | 1947-06-15 | 251.72 |
| 31 | 2432600 | 1948-02-18 | 251.07 |
| 32 | 2432858 | 1948-11-02 | 251.9 |
| 33 | 2433120 | 1949-07-22 | 252.13 |
| 35 | 2433609 | 1950-11-23 | 252.34 |
| 36 | 2433860 | 1951-08-01 | 252.41 |
| 38 | 2434365 | 1952-12-18 | 252.27 |
| 61 | 2440167 | 1968-11-06 | 252.19 |
| 62 | 2440425 | 1969-07-22 | 252.14 |
| 64 | 2440940 | 1970-12-19 | 252.19 |
| 70 | 2442450 | 1975-02-06 | 252.13 |
| 77 | 2444197 | 1979-11-19 | 252.01 |
| 79 | 2444705 | 1981-04-10 | 251.57 |
| 80 | 2444954 | 1981-12-15 | 251.41 |
| 81 | 2445206 | 1982-08-24 | 251.09 |
| 82 | 2445459 | 1983-05-04 | 251.27 |
| 83 | 2445712 | 1984-01-12 | 251.99 |
| 84 | 2445962 | 1984-09-18 | 251.85 |
| 85 | 2446220 | 1985-06-03 | 251.79 |
| 86 | 2446461 | 1986-01-30 | 251.31 |
| 87 | 2446720 | 1986-10-16 | 251.01 |
| 88 | 2446970 | 1987-06-23 | 250.93 |
| 89 | 2447222 | 1988-03-01 | 250.42 |
| 90 | 2447471 | 1988-11-05 | 250.3 |
| 91 | 2447716 | 1989-07-08 | 250.14 |
| 92 | 2447970 | 1990-03-19 | 249.62 |
| 93 | 2448224 | 1990-11-28 | 249.42 |
| 94 | 2448464 | 1991-07-26 | 249.18 |
| 96 | 2448973 | 1992-12-16 | 249.09 |
| 97 | 2449215 | 1993-08-15 | 248.55 |
| 98 | 2449465 | 1994-04-22 | 248.23 |
| 99 | 2449713 | 1994-12-26 | 248.76 |
| 100 | 2449960 | 1995-08-30 | 249.27 |
| 101 | 2450210 | 1996-05-06 | 249.21 |
| 102 | 2450447 | 1996-12-29 | 250 |
| 103 | 2450705 | 1997-09-13 | 250.01 |
| 104 | 2450970 | 1998-06-05 | 250.45 |
| 105 | 2451213 | 1999-02-03 | 250.75 |
| 106 | 2451460 | 1999-10-08 | 250.68 |
| 107 | 2451716 | 2000-06-20 | 250.85 |
| 108 | 2451957 | 2001-02-16 | 250.98 |
| 109 | 2452215 | 2001-11-01 | 251.06 |
| 110 | 2452464 | 2002-07-08 | 251.52 |
| 111 | 2452710 | 2003-03-11 | 251.66 |
| 112 | 2452965 | 2003-11-21 | 251.47 |
| 114 | 2453480 | 2005-04-19 | 251.48 |
| 115 | 2453727 | 2005-12-22 | 251.72 |
| 116 | 2453974 | 2006-08-26 | 251.72 |
| 117 | 2454225 | 2007-05-04 | 251.73 |
| 118 | 2454472 | 2008-01-06 | 251.39 |
| 119 | 2454722 | 2008-09-12 | 251.66 |
| 120 | 2454990 | 2009-06-07 | 252.26 |
| 121 | 2455230 | 2010-02-02 | 252.66 |
| 122 | 2455484 | 2010-10-14 | 253.03 |
| 125 | 2456238 | 2012-11-06 | 253.22 |
| 126 | 2456500 | 2013-07-26 | 253.24 |
| 128 | 2457003 | 2014-12-11 | 252.92 |
| 129 | 2457257 | 2015-08-22 | 253.16 |
| 130 | 2457515 | 2016-05-06 | 252.94 |
| 131 | 2457765 | 2017-01-11 | 253.03 |
| 132 | 2458019 | 2017-09-22 | 252.69 |
| 133 | 2458265 | 2018-05-26 | 252.75 |
| 134 | 2458517 | 2019-02-02 | 252.58 |
| 135 | 2458770 | 2019-10-13 | 252.47 |
| 136 | 2459031 | 2020-06-30 | 252.73 |
| 137 | 2459281 | 2021-03-07 | 252.95 |
| 138 | 2459533 | 2021-11-14 | 253.57 |
| 139 | 2459784 | 2022-07-23 | 253.54 |
| 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. |