| E | O (JD) | O (dat) | Period |
| -65 | 2428737 | 1937-07-22 | 387.63 |
| -64 | 2429121 | 1938-08-10 | 382.62 |
| -63 | 2429508 | 1939-09-01 | 381.4 |
| -60 | 2430672 | 1942-11-08 | 381.68 |
| -59 | 2431060 | 1943-12-01 | 382.23 |
| -41 | 2437907 | 1962-08-30 | 382.5 |
| -40 | 2438285 | 1963-09-12 | 382.1 |
| -39 | 2438668 | 1964-09-29 | 381.67 |
| -38 | 2439066 | 1965-11-01 | 382.35 |
| -37 | 2439453 | 1966-11-23 | 385.93 |
| -36 | 2439832 | 1967-12-07 | 388.25 |
| -35 | 2440220 | 1968-12-29 | 387.43 |
| -34 | 2440600 | 1970-01-13 | 387.12 |
| -33 | 2440995 | 1971-02-12 | 387.75 |
| -30 | 2442170 | 1974-05-02 | 387.46 |
| -26 | 2443700 | 1978-07-10 | 387.58 |
| -25 | 2444110 | 1979-08-24 | 387.17 |
| -24 | 2444481 | 1980-08-29 | 385.5 |
| -23 | 2444870 | 1981-09-22 | 385.06 |
| -22 | 2445252 | 1982-10-09 | 384.36 |
| -21 | 2445635 | 1983-10-27 | 382.93 |
| -20 | 2446011 | 1984-11-06 | 382.43 |
| -19 | 2446405 | 1985-12-05 | 381.43 |
| -18 | 2446786 | 1986-12-21 | 380.64 |
| -17 | 2447166 | 1988-01-05 | 379.36 |
| -16 | 2447539 | 1989-01-12 | 379.14 |
| -15 | 2447923 | 1990-01-31 | 378.14 |
| -14 | 2448293 | 1991-02-05 | 376.07 |
| -13 | 2448664 | 1992-02-11 | 375.71 |
| -12 | 2449060 | 1993-03-13 | 375.93 |
| -11 | 2449425 | 1994-03-13 | 377.64 |
| -10 | 2449792 | 1995-03-15 | 378 |
| -9 | 2450173 | 1996-03-30 | 375.13 |
| -8 | 2450552 | 1997-04-13 | 375.5 |
| -7 | 2450951 | 1998-05-17 | 378.24 |
| -6 | 2451298 | 1999-04-29 | 377.79 |
| -4 | 2452053 | 2001-05-23 | 376.8 |
| -3 | 2452440 | 2002-06-14 | 376.75 |
| -1 | 2453207 | 2004-07-20 | 378.65 |
| 1 | 2453936 | 2006-07-19 | 381.84 |
| 2 | 2454325 | 2007-08-12 | 382.72 |
| 3 | 2454713 | 2008-09-03 | 383.29 |
| 4 | 2455109 | 2009-10-04 | 387.67 |
| 5 | 2455497 | 2010-10-27 | 392.79 |
| 6 | 2455885 | 2011-11-19 | 394.5 |
| 7 | 2456278 | 2012-12-16 | 394.29 |
| 8 | 2456680 | 2014-01-22 | 392.73 |
| 9 | 2457080 | 2015-02-26 | 393.44 |
| 10 | 2457481 | 2016-04-02 | 393.63 |
| 11 | 2457861 | 2017-04-17 | 391 |
| 13 | 2458636 | 2019-06-01 | 389.55 |
| 14 | 2459041 | 2020-07-10 | 388.35 |
| 15 | 2459420 | 2021-07-24 | 387.94 |
| 16 | 2459794 | 2022-08-02 | 389.07 |
| 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. |