| E | O (JD) | O (dat) | Period |
| -81 | 2412180 | 1892-03-22 | 320.64 |
| -80 | 2412500 | 1893-02-05 | 321.67 |
| -79 | 2412818 | 1893-12-20 | 321.03 |
| -78 | 2413135 | 1894-11-02 | 321.05 |
| -77 | 2413460 | 1895-09-23 | 321.29 |
| -72 | 2415065 | 1900-02-14 | 321.37 |
| -71 | 2415400 | 1901-01-15 | 321.64 |
| -70 | 2415700 | 1901-11-11 | 321.87 |
| -69 | 2416030 | 1902-10-07 | 321.83 |
| -66 | 2417000 | 1905-06-03 | 321.58 |
| -65 | 2417320 | 1906-04-19 | 321.92 |
| -64 | 2417646 | 1907-03-11 | 321.64 |
| -63 | 2417967 | 1908-01-26 | 322.11 |
| -62 | 2418280 | 1908-12-04 | 321.82 |
| -61 | 2418600 | 1909-10-20 | 322.27 |
| -57 | 2419900 | 1913-05-12 | 322.71 |
| -56 | 2420210 | 1914-03-18 | 322.88 |
| -55 | 2420540 | 1915-02-11 | 323.2 |
| -54 | 2420860 | 1915-12-28 | 323.42 |
| -53 | 2421200 | 1916-12-02 | 323.3 |
| -52 | 2421520 | 1917-10-18 | 323.24 |
| -48 | 2422805 | 1921-04-25 | 323.61 |
| -47 | 2423130 | 1922-03-16 | 323.82 |
| -46 | 2423450 | 1923-01-30 | 323.78 |
| -45 | 2423770 | 1923-12-16 | 323.42 |
| -44 | 2424100 | 1924-11-10 | 323.88 |
| -43 | 2424430 | 1925-10-06 | 324.77 |
| -42 | 2424765 | 1926-09-06 | 325.22 |
| -40 | 2425400 | 1928-06-02 | 325.74 |
| -39 | 2425720 | 1929-04-18 | 325.67 |
| -38 | 2426047 | 1930-03-11 | 324.57 |
| -37 | 2426380 | 1931-02-07 | 323.85 |
| -36 | 2426710 | 1932-01-03 | 323.29 |
| -35 | 2427038 | 1932-11-26 | 323.42 |
| -34 | 2427355 | 1933-10-09 | 323.02 |
| -30 | 2428640 | 1937-04-16 | 322.85 |
| -29 | 2428961 | 1938-03-03 | 322.14 |
| -28 | 2429280 | 1939-01-16 | 321.82 |
| -27 | 2429610 | 1939-12-12 | 322.18 |
| -26 | 2429928 | 1940-10-25 | 322.54 |
| -25 | 2430264 | 1941-09-26 | 322.72 |
| -22 | 2431214 | 1944-05-03 | 322.59 |
| -21 | 2431538 | 1945-03-23 | 322.99 |
| -20 | 2431875 | 1946-02-23 | 322.88 |
| -19 | 2432190 | 1947-01-04 | 323.27 |
| -18 | 2432510 | 1947-11-20 | 323.3 |
| -17 | 2432830 | 1948-10-05 | 321.21 |
| -16 | 2433170 | 1949-09-10 | 320.95 |
| -13 | 2434130 | 1952-04-27 | 320.85 |
| -12 | 2434460 | 1953-03-23 | 320.71 |
| -11 | 2434780 | 1954-02-06 | 320.53 |
| 13 | 2442460 | 1975-02-16 | 320.32 |
| 14 | 2442785 | 1976-01-07 | 320.14 |
| 15 | 2443110 | 1976-11-27 | 320.01 |
| 20 | 2444700 | 1981-04-05 | 319.87 |
| 21 | 2445016 | 1982-02-15 | 319.74 |
| 22 | 2445330 | 1982-12-26 | 319.38 |
| 23 | 2445662 | 1983-11-23 | 319.69 |
| 25 | 2446290 | 1985-08-12 | 320.43 |
| 26 | 2446616 | 1986-07-04 | 321.5 |
| 28 | 2447250 | 1988-03-29 | 322.14 |
| 29 | 2447584 | 1989-02-26 | 322.42 |
| 30 | 2447911 | 1990-01-19 | 322.72 |
| 31 | 2448240 | 1990-12-14 | 323.54 |
| 32 | 2448551 | 1991-10-21 | 323.26 |
| 33 | 2448880 | 1992-09-14 | 323.52 |
| 35 | 2449519 | 1994-06-15 | 323.46 |
| 36 | 2449850 | 1995-05-12 | 323.14 |
| 37 | 2450173 | 1996-03-30 | 322.73 |
| 38 | 2450488 | 1997-02-08 | 323.11 |
| 39 | 2450821 | 1998-01-07 | 322.97 |
| 40 | 2451152 | 1998-12-04 | 322.95 |
| 41 | 2451460 | 1999-10-08 | 322.05 |
| 43 | 2452100 | 2001-07-09 | 321.45 |
| 44 | 2452433 | 2002-06-07 | 320.78 |
| 45 | 2452756 | 2003-04-26 | 320.37 |
| 46 | 2453076 | 2004-03-11 | 319.77 |
| 47 | 2453384 | 2005-01-13 | 319.48 |
| 48 | 2453703 | 2005-11-28 | 318.55 |
| 49 | 2454020 | 2006-10-11 | 317.82 |
| 50 | 2454355 | 2007-09-11 | 317.12 |
| 51 | 2454660 | 2008-07-12 | 316.94 |
| 52 | 2454974 | 2009-05-22 | 316.92 |
| 53 | 2455294 | 2010-04-07 | 316.75 |
| 54 | 2455615 | 2011-02-22 | 317.02 |
| 55 | 2455919 | 2011-12-23 | 317.17 |
| 56 | 2456240 | 2012-11-08 | 317.95 |
| 59 | 2457191 | 2015-06-08 | 318.56 |
| 60 | 2457512 | 2016-05-03 | 319 |
| 61 | 2457839 | 2017-03-26 | 319.8 |
| 62 | 2458157 | 2018-02-07 | 320.63 |
| 63 | 2458476 | 2018-12-23 | 320.93 |
| 64 | 2458802 | 2019-11-14 | 321.75 |
| 65 | 2459121 | 2020-09-28 | 321.67 |
| 66 | 2459448 | 2021-08-21 | 321.39 |
| 67 | 2459763 | 2022-07-02 | 321.86 |
| 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. |