| E | O (JD) | O (dat) | Period |
| -136 | 2410008 | 1886-04-11 | 252.19 |
| -113 | 2415780 | 1902-01-30 | 251.64 |
| -112 | 2416030 | 1902-10-07 | 251.23 |
| -109 | 2416790 | 1904-11-05 | 251.04 |
| -107 | 2417300 | 1906-03-30 | 250.88 |
| -106 | 2417540 | 1906-11-25 | 251.27 |
| -103 | 2418300 | 1908-12-24 | 251.56 |
| -100 | 2419040 | 1911-01-03 | 251.48 |
| -90 | 2421550 | 1917-11-17 | 251.16 |
| -80 | 2424080 | 1924-10-21 | 251.12 |
| -77 | 2424840 | 1926-11-20 | 251.6 |
| -75 | 2425345 | 1928-04-08 | 252.27 |
| -68 | 2427076 | 1933-01-03 | 252.54 |
| -64 | 2428100 | 1935-10-24 | 252.27 |
| -58 | 2429620 | 1939-12-22 | 252.27 |
| -55 | 2430395 | 1942-02-04 | 252.91 |
| -54 | 2430640 | 1942-10-07 | 253 |
| -52 | 2431146 | 1944-02-25 | 252.37 |
| -51 | 2431400 | 1944-11-05 | 251.2 |
| -49 | 2431896 | 1946-03-16 | 250.34 |
| -45 | 2432894 | 1948-12-08 | 250.24 |
| -42 | 2433659 | 1951-01-12 | 250.2 |
| -36 | 2435148 | 1955-02-09 | 250.39 |
| -35 | 2435400 | 1955-10-19 | 250.86 |
| -33 | 2435895 | 1957-02-25 | 251.11 |
| -30 | 2436659 | 1959-03-31 | 251.36 |
| -29 | 2436903 | 1959-11-30 | 251.74 |
| -23 | 2438423 | 1964-01-28 | 252.24 |
| -19 | 2439430 | 1966-10-31 | 252.53 |
| -17 | 2439934 | 1968-03-18 | 252.72 |
| -16 | 2440180 | 1968-11-19 | 253.15 |
| -14 | 2440700 | 1970-04-23 | 253.2 |
| -13 | 2440945 | 1970-12-24 | 253.44 |
| -10 | 2441715 | 1973-02-01 | 253.65 |
| -9 | 2441965 | 1973-10-09 | 253.56 |
| -7 | 2442471 | 1975-02-27 | 253.46 |
| -6 | 2442722 | 1975-11-05 | 253.62 |
| -4 | 2443226 | 1977-03-23 | 253.5 |
| -3 | 2443486 | 1977-12-08 | 253.05 |
| -2 | 2443735 | 1978-08-14 | 252.91 |
| 0 | 2444251 | 1980-01-12 | 253.39 |
| 3 | 2445006 | 1982-02-05 | 252.7 |
| 4 | 2445250 | 1982-10-07 | 252.08 |
| 6 | 2445760 | 1984-02-29 | 251.54 |
| 7 | 2446016 | 1984-11-11 | 250.77 |
| 9 | 2446508 | 1986-03-18 | 252.15 |
| 10 | 2446763 | 1986-11-28 | 252.37 |
| 12 | 2447260 | 1988-04-08 | 251.34 |
| 13 | 2447514 | 1988-12-18 | 252.12 |
| 14 | 2447785 | 1989-09-15 | 252.47 |
| 15 | 2448020 | 1990-05-08 | 252.36 |
| 16 | 2448280 | 1991-01-23 | 253.59 |
| 17 | 2448530 | 1991-09-30 | 253.33 |
| 19 | 2449033 | 1993-02-14 | 253.28 |
| 20 | 2449280 | 1993-10-19 | 253.17 |
| 22 | 2449805 | 1995-03-28 | 252.11 |
| 23 | 2450054 | 1995-12-02 | 253.41 |
| 24 | 2450310 | 1996-08-14 | 254.47 |
| 25 | 2450547 | 1997-04-08 | 253.47 |
| 26 | 2450801 | 1997-12-18 | 252.29 |
| 27 | 2451070 | 1998-09-13 | 251.72 |
| 29 | 2451569 | 2000-01-25 | 252.79 |
| 30 | 2451825 | 2000-10-07 | 254.05 |
| 32 | 2452323 | 2002-02-17 | 252.86 |
| 33 | 2452572 | 2002-10-24 | 252.15 |
| 35 | 2453088 | 2004-03-23 | 252.25 |
| 36 | 2453341 | 2004-12-01 | 251.95 |
| 38 | 2453840 | 2006-04-14 | 252.33 |
| 39 | 2454094 | 2006-12-24 | 251.59 |
| 40 | 2454345 | 2007-09-01 | 250.06 |
| 41 | 2454590 | 2008-05-03 | 250.7 |
| 42 | 2454847 | 2009-01-15 | 250.76 |
| 43 | 2455090 | 2009-09-15 | 249.72 |
| 45 | 2455590 | 2011-01-28 | 249.63 |
| 46 | 2455853 | 2011-10-18 | 249.55 |
| 48 | 2456344 | 2013-02-20 | 249.67 |
| 49 | 2456590 | 2013-10-24 | 249.86 |
| 51 | 2457088 | 2015-03-06 | 249.2 |
| 52 | 2457340 | 2015-11-13 | 249.1 |
| 54 | 2457840 | 2017-03-27 | 250.05 |
| 55 | 2458087 | 2017-11-29 | 251 |
| 56 | 2458340 | 2018-08-09 | 250.75 |
| 57 | 2458590 | 2019-04-16 | 250.47 |
| 58 | 2458845 | 2019-12-27 | 250.71 |
| 59 | 2459100 | 2020-09-07 | 250.63 |
| 60 | 2459340 | 2021-05-05 | 251.27 |
| 61 | 2459597 | 2022-01-17 | 250.58 |
| 62 | 2459840 | 2022-09-17 | 249.68 |
| 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. |