| E | O (JD) | O (dat) | Period |
| -109 | 2398107 | 1853-09-10 | 426.29 |
| -108 | 2398531 | 1854-11-08 | 423.42 |
| -107 | 2398951 | 1856-01-02 | 423.76 |
| -106 | 2399388 | 1857-03-14 | 425.76 |
| -105 | 2399810 | 1858-05-10 | 423.38 |
| -104 | 2400219 | 1859-06-23 | 423.33 |
| -103 | 2400662 | 1860-09-08 | 424.06 |
| -102 | 2401083 | 1861-11-03 | 423.78 |
| -99 | 2402329 | 1865-04-02 | 424.17 |
| -98 | 2402773 | 1866-06-20 | 424.88 |
| -97 | 2403199 | 1867-08-20 | 425 |
| -96 | 2403627 | 1868-10-21 | 425.6 |
| -95 | 2404037 | 1869-12-05 | 427.07 |
| -94 | 2404492 | 1871-03-05 | 426.71 |
| -93 | 2404903 | 1872-04-19 | 425.67 |
| -91 | 2405744 | 1874-08-08 | 425.61 |
| -90 | 2406191 | 1875-10-29 | 423.67 |
| -88 | 2407035 | 1878-02-19 | 423.33 |
| -87 | 2407453 | 1879-04-13 | 426.11 |
| -86 | 2407872 | 1880-06-05 | 425.81 |
| -85 | 2408283 | 1881-07-21 | 423.4 |
| -84 | 2408732 | 1882-10-13 | 425.08 |
| -83 | 2409159 | 1883-12-14 | 426 |
| -82 | 2409589 | 1885-02-16 | 426.43 |
| -81 | 2409988 | 1886-03-22 | 426.36 |
| -80 | 2410451 | 1887-06-28 | 425.14 |
| -79 | 2410838 | 1888-07-19 | 426.21 |
| -78 | 2411287 | 1889-10-11 | 427.64 |
| -77 | 2411697 | 1890-11-25 | 426.36 |
| -76 | 2412146 | 1892-02-17 | 427.65 |
| -75 | 2412569 | 1893-04-15 | 429.29 |
| -74 | 2412995 | 1894-06-15 | 428.08 |
| -73 | 2413413 | 1895-08-07 | 427.5 |
| -72 | 2413863 | 1896-10-30 | 425.21 |
| -71 | 2414272 | 1897-12-13 | 425.64 |
| -70 | 2414705 | 1899-02-19 | 428.28 |
| -69 | 2415123 | 1900-04-13 | 428.42 |
| -68 | 2415545 | 1901-06-09 | 428.28 |
| -67 | 2415978 | 1902-08-16 | 429.79 |
| -66 | 2416426 | 1903-11-07 | 429.79 |
| -65 | 2416848 | 1905-01-02 | 428.01 |
| -64 | 2417283 | 1906-03-13 | 427.15 |
| -63 | 2417711 | 1907-05-15 | 424.64 |
| -62 | 2418134 | 1908-07-11 | 422.36 |
| -61 | 2418526 | 1909-08-07 | 421.71 |
| -60 | 2418977 | 1910-11-01 | 419.06 |
| -59 | 2419372 | 1911-12-01 | 417.49 |
| -58 | 2419815 | 1913-02-16 | 419.99 |
| -57 | 2420220 | 1914-03-28 | 420.5 |
| -56 | 2420641 | 1915-05-23 | 421.22 |
| -55 | 2421049 | 1916-07-04 | 421.51 |
| -54 | 2421491 | 1917-09-19 | 420.94 |
| -53 | 2421899 | 1918-11-01 | 422.29 |
| -52 | 2422347 | 1920-01-23 | 423.57 |
| -51 | 2422741 | 1921-02-20 | 424.79 |
| -50 | 2423187 | 1922-05-12 | 425.56 |
| -49 | 2423586 | 1923-06-15 | 426.85 |
| -48 | 2424034 | 1924-09-05 | 428.42 |
| -47 | 2424453 | 1925-10-29 | 429.14 |
| -46 | 2424895 | 1927-01-14 | 430.58 |
| -45 | 2425327 | 1928-03-21 | 431.15 |
| -44 | 2425759 | 1929-05-27 | 429.72 |
| -43 | 2426177 | 1930-07-19 | 429.57 |
| -42 | 2426624 | 1931-10-09 | 428.64 |
| -41 | 2427032 | 1932-11-20 | 430.36 |
| -40 | 2427471 | 1934-02-02 | 430.92 |
| -39 | 2427891 | 1935-03-29 | 429.78 |
| -38 | 2428332 | 1936-06-12 | 430.56 |
| -37 | 2428779 | 1937-09-02 | 429.57 |
| -36 | 2429190 | 1938-10-18 | 429.15 |
| -35 | 2429628 | 1939-12-30 | 430.22 |
| -34 | 2430056 | 1941-03-02 | 426.22 |
| -33 | 2430461 | 1942-04-11 | 426.64 |
| -32 | 2430909 | 1943-07-03 | 427.43 |
| -31 | 2431337 | 1944-09-03 | 427 |
| -30 | 2431741 | 1945-10-12 | 428.64 |
| -29 | 2432201 | 1947-01-15 | 428.35 |
| -28 | 2432601 | 1948-02-19 | 429.06 |
| -27 | 2433061 | 1949-05-24 | 430.07 |
| -26 | 2433457 | 1950-06-24 | 429.08 |
| -25 | 2433910 | 1951-09-20 | 429.15 |
| -24 | 2434343 | 1952-11-26 | 429.58 |
| -23 | 2434756 | 1954-01-13 | 428.36 |
| -22 | 2435193 | 1955-03-26 | 428.86 |
| -21 | 2435617 | 1956-05-23 | 427 |
| -20 | 2436059 | 1957-08-08 | 426.56 |
| -19 | 2436456 | 1958-09-09 | 427.85 |
| -18 | 2436915 | 1959-12-12 | 427.64 |
| -17 | 2437316 | 1961-01-16 | 427.43 |
| -16 | 2437755 | 1962-03-31 | 428.22 |
| -15 | 2438184 | 1963-06-03 | 428.15 |
| -14 | 2438613 | 1964-08-05 | 429.29 |
| -13 | 2439047 | 1965-10-13 | 429.64 |
| -12 | 2439463 | 1966-12-03 | 427.79 |
| -11 | 2439902 | 1968-02-15 | 426.57 |
| -10 | 2440339 | 1969-04-27 | 425.92 |
| -9 | 2440747 | 1970-06-09 | 426.14 |
| -8 | 2441181 | 1971-08-17 | 426.71 |
| -7 | 2441588 | 1972-09-27 | 426.93 |
| -6 | 2442035 | 1973-12-18 | 426.86 |
| -5 | 2442441 | 1975-01-28 | 427.15 |
| -4 | 2442898 | 1976-04-29 | 429.79 |
| -3 | 2443320 | 1977-06-25 | 429.71 |
| -2 | 2443742 | 1978-08-21 | 430.71 |
| -1 | 2444166 | 1979-10-19 | 431.36 |
| 0 | 2444620 | 1981-01-15 | 429.85 |
| 1 | 2445019 | 1982-02-18 | 432 |
| 2 | 2445487 | 1983-06-01 | 431 |
| 3 | 2445891 | 1984-07-09 | 429.79 |
| 4 | 2446345 | 1985-10-06 | 429.51 |
| 5 | 2446765 | 1986-11-30 | 427.72 |
| 6 | 2447177 | 1988-01-16 | 426.58 |
| 7 | 2447626 | 1989-04-09 | 426.43 |
| 8 | 2448026 | 1990-05-14 | 423.78 |
| 9 | 2448468 | 1991-07-30 | 424.14 |
| 10 | 2448882 | 1992-09-16 | 421.49 |
| 11 | 2449324 | 1993-12-02 | 420.43 |
| 12 | 2449719 | 1995-01-01 | 420.43 |
| 13 | 2450161 | 1996-03-18 | 419.64 |
| 14 | 2450543 | 1997-04-04 | 419.72 |
| 15 | 2450995 | 1998-06-30 | 420.94 |
| 16 | 2451385 | 1999-07-25 | 421.08 |
| 17 | 2451840 | 2000-10-22 | 423.21 |
| 18 | 2452242 | 2001-11-28 | 423.56 |
| 19 | 2452694 | 2003-02-23 | 423.92 |
| 20 | 2453081 | 2004-03-16 | 426.92 |
| 21 | 2453548 | 2005-06-26 | 426.35 |
| 22 | 2453920 | 2006-07-03 | 426.56 |
| 23 | 2454395 | 2007-10-21 | 427.29 |
| 24 | 2454807 | 2008-12-06 | 428.94 |
| 25 | 2455244 | 2010-02-16 | 432.44 |
| 26 | 2455664 | 2011-04-12 | 433.22 |
| 27 | 2456093 | 2012-06-14 | 432.36 |
| 28 | 2456541 | 2013-09-05 | 432.29 |
| 29 | 2456981 | 2014-11-19 | 431.93 |
| 30 | 2457399 | 2016-01-11 | 433.21 |
| 31 | 2457856 | 2017-04-12 | 431.07 |
| 32 | 2458247 | 2018-05-08 | 429.79 |
| 33 | 2458708 | 2019-08-12 | 430.28 |
| 34 | 2459114 | 2020-09-21 | 426.17 |
| 35 | 2459555 | 2021-12-06 | 420.02 |
| 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. |