| E | O (JD) | O (dat) | Period |
| -33 | 2423736 | 1923-11-12 | 300.58 |
| -23 | 2426717 | 1932-01-10 | 300.59 |
| -22 | 2427001 | 1932-10-20 | 300.84 |
| -19 | 2427889 | 1935-03-27 | 300.65 |
| 23 | 2440538 | 1969-11-12 | 300.56 |
| 24 | 2440840 | 1970-09-10 | 300.76 |
| 27 | 2441760 | 1973-03-18 | 300.95 |
| 28 | 2442059 | 1974-01-11 | 301.17 |
| 29 | 2442357 | 1974-11-05 | 300.41 |
| 30 | 2442640 | 1975-08-15 | 297.91 |
| 33 | 2443549 | 1978-02-09 | 296.09 |
| 34 | 2443852 | 1978-12-09 | 296.23 |
| 35 | 2444135 | 1979-09-18 | 296.91 |
| 38 | 2445019 | 1982-02-18 | 296.95 |
| 39 | 2445314 | 1982-12-10 | 296.9 |
| 40 | 2445619 | 1983-10-11 | 298.5 |
| 41 | 2445910 | 1984-07-28 | 300.39 |
| 43 | 2446515 | 1986-03-25 | 301.33 |
| 44 | 2446824 | 1987-01-28 | 301.6 |
| 45 | 2447133 | 1987-12-03 | 302.2 |
| 46 | 2447428 | 1988-09-23 | 302.21 |
| 49 | 2448329 | 1991-03-13 | 301.63 |
| 50 | 2448636 | 1992-01-14 | 301.35 |
| 51 | 2448937 | 1992-11-10 | 301.5 |
| 52 | 2449230 | 1993-08-30 | 302.11 |
| 54 | 2449840 | 1995-05-02 | 302.56 |
| 55 | 2450144 | 1996-03-01 | 301.56 |
| 56 | 2450447 | 1996-12-29 | 301.81 |
| 57 | 2450748 | 1997-10-26 | 303.07 |
| 58 | 2451058 | 1998-09-01 | 302.43 |
| 59 | 2451340 | 1999-06-10 | 302.07 |
| 60 | 2451656 | 2000-04-21 | 302.64 |
| 61 | 2451960 | 2001-02-19 | 302.43 |
| 62 | 2452258 | 2001-12-14 | 303.29 |
| 63 | 2452562 | 2002-10-14 | 303.79 |
| 64 | 2452870 | 2003-08-18 | 302.71 |
| 65 | 2453170 | 2004-06-13 | 303.5 |
| 66 | 2453474 | 2005-04-13 | 304.5 |
| 67 | 2453775 | 2006-02-08 | 303.43 |
| 68 | 2454079 | 2006-12-09 | 301.64 |
| 69 | 2454388 | 2007-10-14 | 302.71 |
| 70 | 2454695 | 2008-08-16 | 303.57 |
| 71 | 2454985 | 2009-06-02 | 301.86 |
| 72 | 2455278 | 2010-03-22 | 300.57 |
| 73 | 2455604 | 2011-02-11 | 300.5 |
| 74 | 2455895 | 2011-11-29 | 302.14 |
| 75 | 2456185 | 2012-09-14 | 304.14 |
| 76 | 2456490 | 2013-07-16 | 302.14 |
| 77 | 2456800 | 2014-05-22 | 300.14 |
| 78 | 2457110 | 2015-03-28 | 301.43 |
| 79 | 2457411 | 2016-01-23 | 301.43 |
| 80 | 2457701 | 2016-11-08 | 299.14 |
| 81 | 2458000 | 2017-09-03 | 296.29 |
| 82 | 2458300 | 2018-06-30 | 295 |
| 83 | 2458595 | 2019-04-21 | 295.29 |
| 84 | 2458883 | 2020-02-03 | 295.44 |
| 85 | 2459175 | 2020-11-21 | 294.23 |
| 86 | 2459476 | 2021-09-18 | 292.83 |
| 87 | 2459770 | 2022-07-09 | 292.4 |
| 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. |