| E | O (JD) | O (dat) | Period |
| -29 | 2440910 | 1970-11-19 | 385 |
| -28 | 2441300 | 1971-12-14 | 384.5 |
| -27 | 2441680 | 1972-12-28 | 382.57 |
| -26 | 2442068 | 1974-01-20 | 382.29 |
| -25 | 2442452 | 1975-02-08 | 382.79 |
| -24 | 2442834 | 1976-02-25 | 383.73 |
| -23 | 2443208 | 1977-03-05 | 383.88 |
| -22 | 2443590 | 1978-03-22 | 384.22 |
| -21 | 2443979 | 1979-04-15 | 385.45 |
| -19 | 2444757 | 1981-06-01 | 385.8 |
| -18 | 2445133 | 1982-06-12 | 386.2 |
| -15 | 2446303 | 1985-08-25 | 385.8 |
| -14 | 2446692 | 1986-09-18 | 383.95 |
| -13 | 2447066 | 1987-09-27 | 383.06 |
| -12 | 2447456 | 1988-10-21 | 381.56 |
| -11 | 2447829 | 1989-10-29 | 378.5 |
| -10 | 2448202 | 1990-11-06 | 378.29 |
| -9 | 2448583 | 1991-11-22 | 377.86 |
| -8 | 2448958 | 1992-12-01 | 377.36 |
| -7 | 2449336 | 1993-12-14 | 378.21 |
| -6 | 2449718 | 1994-12-31 | 378 |
| -5 | 2450094 | 1996-01-11 | 377.07 |
| -4 | 2450474 | 1997-01-25 | 377.93 |
| -3 | 2450852 | 1998-02-07 | 378.14 |
| -2 | 2451225 | 1999-02-15 | 378.5 |
| -1 | 2451595 | 2000-02-20 | 378.79 |
| 0 | 2451990 | 2001-03-21 | 378.86 |
| 1 | 2452358 | 2002-03-24 | 379.4 |
| 2 | 2452753 | 2003-04-23 | 380.44 |
| 3 | 2453118 | 2004-04-22 | 380.63 |
| 4 | 2453512 | 2005-05-21 | 380.69 |
| 6 | 2454256 | 2007-06-04 | 380.81 |
| 7 | 2454651 | 2008-07-03 | 380.31 |
| 8 | 2455024 | 2009-07-11 | 380.19 |
| 9 | 2455415 | 2010-08-06 | 380.93 |
| 10 | 2455789 | 2011-08-15 | 381.21 |
| 11 | 2456167 | 2012-08-27 | 380.14 |
| 12 | 2456546 | 2013-09-10 | 380.07 |
| 13 | 2456936 | 2014-10-05 | 380.07 |
| 14 | 2457308 | 2015-10-12 | 381 |
| 15 | 2457689 | 2016-10-27 | 381.86 |
| 16 | 2458071 | 2017-11-13 | 380.79 |
| 17 | 2458454 | 2018-12-01 | 379.98 |
| 18 | 2458836 | 2019-12-18 | 381.8 |
| 19 | 2459223 | 2021-01-08 | 381.92 |
| 20 | 2459590 | 2022-01-10 | 381.9 |
| 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. |