| E | O (JD) | O (dat) | Period |
| -55 | 2418770 | 1910-04-08 | 386.61 |
| -53 | 2419535 | 1912-05-12 | 385.33 |
| -37 | 2425700 | 1929-03-29 | 384.2 |
| -36 | 2426080 | 1930-04-13 | 384.88 |
| -35 | 2426484 | 1931-05-22 | 384.76 |
| -34 | 2426843 | 1932-05-15 | 384.07 |
| -33 | 2427238 | 1933-06-14 | 384.23 |
| -32 | 2427622 | 1934-07-03 | 384.68 |
| -31 | 2427997 | 1935-07-13 | 385.18 |
| -29 | 2428760 | 1937-08-14 | 385.49 |
| -18 | 2433010 | 1949-04-03 | 385.46 |
| -16 | 2433787 | 1951-05-20 | 385.67 |
| 1 | 2440340 | 1969-04-28 | 385.7 |
| 2 | 2440725 | 1970-05-18 | 385.35 |
| 3 | 2441117 | 1971-06-14 | 384.75 |
| 4 | 2441499 | 1972-06-30 | 383.33 |
| 5 | 2441871 | 1973-07-07 | 378.85 |
| 6 | 2442249 | 1974-07-20 | 377.85 |
| 7 | 2442631 | 1975-08-06 | 377.36 |
| 8 | 2442996 | 1976-08-05 | 381.06 |
| 9 | 2443373 | 1977-08-17 | 383 |
| 10 | 2443759 | 1978-09-07 | 382.5 |
| 11 | 2444140 | 1979-09-23 | 382.66 |
| 17 | 2446470 | 1986-02-08 | 383.54 |
| 19 | 2447225 | 1988-03-04 | 383.89 |
| 20 | 2447600 | 1989-03-14 | 383.65 |
| 21 | 2447976 | 1990-03-25 | 382.09 |
| 22 | 2448365 | 1991-04-18 | 380.07 |
| 23 | 2448748 | 1992-05-05 | 380.72 |
| 24 | 2449126 | 1993-05-18 | 382.07 |
| 25 | 2449508 | 1994-06-04 | 381.93 |
| 26 | 2449888 | 1995-06-19 | 380.07 |
| 27 | 2450267 | 1996-07-02 | 379.43 |
| 28 | 2450658 | 1997-07-28 | 379.43 |
| 29 | 2451030 | 1998-08-04 | 378.78 |
| 30 | 2451404 | 1999-08-13 | 378.78 |
| 31 | 2451782 | 2000-08-25 | 379.28 |
| 32 | 2452164 | 2001-09-11 | 380.15 |
| 33 | 2452535 | 2002-09-17 | 381.86 |
| 34 | 2452923 | 2003-10-10 | 382.35 |
| 35 | 2453312 | 2004-11-02 | 382.57 |
| 36 | 2453698 | 2005-11-23 | 384.85 |
| 37 | 2454082 | 2006-12-12 | 386.93 |
| 38 | 2454457 | 2007-12-22 | 386.87 |
| 39 | 2454845 | 2009-01-13 | 387.43 |
| 40 | 2455242 | 2010-02-14 | 388 |
| 41 | 2455633 | 2011-03-12 | 388.63 |
| 43 | 2456405 | 2013-04-22 | 389.19 |
| 44 | 2456804 | 2014-05-26 | 388 |
| 45 | 2457184 | 2015-06-10 | 387.06 |
| 46 | 2457573 | 2016-07-03 | 387.06 |
| 47 | 2457956 | 2017-07-21 | 386.72 |
| 48 | 2458339 | 2018-08-08 | 386.29 |
| 49 | 2458729 | 2019-09-02 | 386.04 |
| 50 | 2459115 | 2020-09-22 | 386.08 |
| 51 | 2459508 | 2021-10-20 | 387.5 |
| 52 | 2459888 | 2022-11-04 | 388.39 |
| 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. |