| E | O (JD) | O (dat) | Period |
| 0 | 2425744 | 1929-05-12 | 431.04 |
| 1 | 2426210 | 1930-08-21 | 431.37 |
| 2 | 2426640 | 1931-10-25 | 431.99 |
| 7 | 2428800 | 1937-09-23 | 432.06 |
| 47 | 2446030 | 1984-11-25 | 431.64 |
| 48 | 2446490 | 1986-02-28 | 431.29 |
| 49 | 2446933 | 1987-05-17 | 431.16 |
| 50 | 2447343 | 1988-06-30 | 431.55 |
| 51 | 2447775 | 1989-09-05 | 432.64 |
| 52 | 2448204 | 1990-11-08 | 429.79 |
| 53 | 2448627 | 1992-01-05 | 430.36 |
| 54 | 2449075 | 1993-03-28 | 431.07 |
| 55 | 2449502 | 1994-05-29 | 432.07 |
| 56 | 2449938 | 1995-08-08 | 435.07 |
| 57 | 2450363 | 1996-10-06 | 434.86 |
| 58 | 2450790 | 1997-12-07 | 433.14 |
| 59 | 2451238 | 1999-02-28 | 429.79 |
| 60 | 2451684 | 2000-05-19 | 427 |
| 61 | 2452106 | 2001-07-15 | 428.21 |
| 62 | 2452535 | 2002-09-17 | 426.57 |
| 63 | 2452922 | 2003-10-09 | 424.07 |
| 64 | 2453357 | 2004-12-17 | 422.21 |
| 65 | 2453791 | 2006-02-24 | 422.07 |
| 66 | 2454209 | 2007-04-18 | 427.71 |
| 67 | 2454650 | 2008-07-02 | 430.21 |
| 68 | 2455051 | 2009-08-07 | 427.71 |
| 69 | 2455499 | 2010-10-29 | 427.93 |
| 70 | 2455946 | 2012-01-19 | 427 |
| 71 | 2456356 | 2013-03-04 | 427 |
| 72 | 2456780 | 2014-05-02 | 427.36 |
| 73 | 2457211 | 2015-07-07 | 426.07 |
| 74 | 2457626 | 2016-08-25 | 428.43 |
| 75 | 2458053 | 2017-10-26 | 431.14 |
| 76 | 2458480 | 2018-12-27 | 430.59 |
| 77 | 2458930 | 2020-03-21 | 431 |
| 78 | 2459370 | 2021-06-04 | 435.33 |
| 79 | 2459802 | 2022-08-10 | 437 |
| 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. |