| E | O (JD) | O (dat) | Period |
| -56 | 2415125 | 1900-04-15 | 348.98 |
| -46 | 2418610 | 1909-10-30 | 349.38 |
| -29 | 2424530 | 1926-01-14 | 349.14 |
| -27 | 2425250 | 1928-01-04 | 348.78 |
| -26 | 2425590 | 1928-12-09 | 349.1 |
| -25 | 2425950 | 1929-12-04 | 349.47 |
| -23 | 2426630 | 1931-10-15 | 348.57 |
| -22 | 2426990 | 1932-10-09 | 347.5 |
| -19 | 2428040 | 1935-08-25 | 349 |
| -18 | 2428380 | 1936-07-30 | 348.95 |
| -17 | 2428720 | 1937-07-05 | 349.85 |
| -16 | 2429070 | 1938-06-20 | 350.26 |
| -15 | 2429450 | 1939-07-05 | 350.51 |
| -14 | 2429760 | 1940-05-10 | 350.76 |
| 29 | 2444851 | 1981-09-03 | 350.8 |
| 30 | 2445205 | 1982-08-23 | 350.5 |
| 31 | 2445565 | 1983-08-18 | 350.72 |
| 32 | 2445909 | 1984-07-27 | 351.29 |
| 33 | 2446259 | 1985-07-12 | 352.44 |
| 34 | 2446610 | 1986-06-28 | 352.25 |
| 36 | 2447321 | 1988-06-08 | 352.31 |
| 37 | 2447665 | 1989-05-18 | 353.38 |
| 38 | 2448030 | 1990-05-18 | 353.88 |
| 39 | 2448376 | 1991-04-29 | 354.07 |
| 40 | 2448735 | 1992-04-22 | 354.5 |
| 41 | 2449087 | 1993-04-09 | 354.14 |
| 42 | 2449444 | 1994-04-01 | 354.71 |
| 43 | 2449798 | 1995-03-21 | 355.36 |
| 44 | 2450151 | 1996-03-08 | 353.93 |
| 45 | 2450502 | 1997-02-22 | 353.07 |
| 46 | 2450870 | 1998-02-25 | 351.86 |
| 47 | 2451216 | 1999-02-06 | 351 |
| 48 | 2451561 | 2000-01-17 | 350.71 |
| 49 | 2451913 | 2001-01-03 | 349.47 |
| 50 | 2452255 | 2001-12-11 | 348.44 |
| 51 | 2452608 | 2002-11-29 | 348.88 |
| 52 | 2452955 | 2003-11-11 | 349.38 |
| 54 | 2453659 | 2005-10-15 | 349.45 |
| 55 | 2454002 | 2006-09-23 | 349.46 |
| 56 | 2454357 | 2007-09-13 | 349.38 |
| 57 | 2454707 | 2008-08-28 | 348.91 |
| 62 | 2456450 | 2013-06-06 | 348.91 |
| 63 | 2456800 | 2014-05-22 | 348.95 |
| 64 | 2457148 | 2015-05-05 | 348.59 |
| 65 | 2457491 | 2016-04-12 | 348.67 |
| 66 | 2457846 | 2017-04-02 | 349.86 |
| 67 | 2458190 | 2018-03-12 | 351.57 |
| 68 | 2458543 | 2019-02-28 | 352.02 |
| 69 | 2458890 | 2020-02-10 | 351.46 |
| 70 | 2459258 | 2021-02-12 | 352.58 |
| 71 | 2459612 | 2022-02-01 | 354.3 |
| 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. |