Maxima for Z Cyg
Period: 263.69, Epoch: 2444618
Back to main page  Mean light curve  Period diagram

E Mag O (JD) O (dat) C (JD) C (Dat) O-C Source
-130   2410354 1887-03-23 2410338 1887-03-07 16 AnHar, 1937, vol 105, p 459
-128   2410854 1888-08-04 2410866 1888-08-16 -12 GuL, 1920, 1.2
-127   2411146 1889-05-23 2411129 1889-05-06 17 GuL, 1920, 1.2
-125   2411674 1890-11-02 2411657 1890-10-16 17 AnHar, 1909, vol 55, p 95
-124   2411953 1891-08-08 2411920 1891-07-06 33 AnHar, 1909, vol 55, p 95
-123   2412192 1892-04-03 2412184 1892-03-26 8 AnHar, 1909, vol 55, p 95
-122   2412447 1892-12-14 2412448 1892-12-15 -1 GuL, 1920, 1.2, AnHar, 1909, vol 55, p 95
-121   2412720 1893-09-13 2412712 1893-09-05 8 GuL, 1920, 1.2, AnHar, 1909, vol 55, p 95
-120   2412988 1894-06-08 2412975 1894-05-26 13 GuL, 1920, 1.2, AnHar, 1909, vol 55, p 95
-119   2413235 1895-02-10 2413239 1895-02-14 -4 GuL, 1920, 1.2
-118 9.0 2413506 1895-11-08 2413503 1895-11-05 3 SVO
-117   2413777 1896-08-05 2413766 1896-07-25 11 GuL, 1920, 1.2, AnHar, 1909, vol 55, p 95
-116   2414041 1897-04-26 2414030 1897-04-15 11 GuL, 1920, 1.2, AnHar, 1909, vol 55, p 95
-115   2414284 1897-12-25 2414294 1898-01-04 -10 GuL, 1920, 1.2
-114   2414557 1898-09-24 2414557 1898-09-24 0 GuL, 1920, 1.2
-113   2414809 1899-06-03 2414821 1899-06-15 -12 GuL, 1920, 1.2, AnHar, 1952, vol 118
-112   2415074 1900-02-23 2415085 1900-03-06 -11 GuL, 1920, 1.2
-111   2415334 1900-11-10 2415348 1900-11-24 -14 GuL, 1920, 1.2
-110   2415604 1901-08-07 2415612 1901-08-15 -8 AnHar, 1952, vol 118, GuL, 1920, 1.2
-109   2415866 1902-04-26 2415876 1902-05-06 -10 GuL, 1920, 1.2, AnHar, 1952, vol 118
-108   2416135 1903-01-20 2416139 1903-01-24 -4 AnHar, 1952, vol 118, GuL, 1920, 1.2
-107   2416399 1903-10-11 2416403 1903-10-15 -4 GuL, 1920, 1.2, AnHar, 1952, vol 118
-106 8.7 2416649 1904-06-17 2416667 1904-07-05 -18 SVO
-105 8.9 2416915 1905-03-10 2416931 1905-03-26 -16 SVO
-104 8.8 2417183 1905-12-03 2417194 1905-12-14 -11 SVO
-103 9.0 2417462 1906-09-08 2417458 1906-09-04 4 SVO
-102 8.8 2417698 1907-05-02 2417722 1907-05-26 -24 AAVSO
-101 8.8 2417957 1908-01-16 2417985 1908-02-13 -28 SVO
-100 9.4 2418225 1908-10-10 2418249 1908-11-03 -24 SVO
-99 8.7 2418470 1909-06-12 2418513 1909-07-25 -43 AAVSO
-98 8.9 2418735 1910-03-04 2418776 1910-04-14 -41 AAVSO
-97 8.7 2418995 1910-11-19 2419040 1911-01-03 -45 SVO
-96   2419260 1911-08-11 2419304 1911-09-24 -44 AnHar, 1952, vol 118
-95   2419558 1912-06-04 2419567 1912-06-13 -9 AAVSO
-94   2419795 1913-01-27 2419831 1913-03-04 -36 AJ, 1915, vol 29, p 47
-93 8.5 2420084 1913-11-12 2420095 1913-11-23 -11 AAVSO
-92 9.1 2420344 1914-07-30 2420359 1914-08-14 -15 SVO
-91 9.0 2420603 1915-04-15 2420622 1915-05-04 -19 SVO
-90 8.7 2420868 1916-01-05 2420886 1916-01-23 -18 AAVSO
-89 8.5 2421117 1916-09-10 2421150 1916-10-13 -33 SVO
-88 8.4 2421364 1917-05-15 2421413 1917-07-03 -49 SVO
-87 9.6 2421644 1918-02-19 2421677 1918-03-24 -33 SVO
-86 8.8 2421906 1918-11-08 2421941 1918-12-13 -35 SVO
-85 9.0 2422169 1919-07-29 2422204 1919-09-02 -35 SVO
-84 8.5 2422437 1920-04-22 2422468 1920-05-23 -31 AAVSO
-83 9.1 2422697 1921-01-07 2422732 1921-02-11 -35 SVO
-82 8.9 2422961 1921-09-28 2422995 1921-11-01 -34 SVO
-81 9.5 2423217 1922-06-11 2423259 1922-07-23 -42 SVO
-80 8.9 2423471 1923-02-20 2423523 1923-04-13 -52 SVO
-79 9.9 2423730 1923-11-06 2423786 1924-01-01 -56 SVO
-78 9.5 2423987 1924-07-20 2424050 1924-09-21 -63 SVO
-77 9.1 2424255 1925-04-14 2424314 1925-06-12 -59 SVO
-76 8.4 2424516 1925-12-31 2424578 1926-03-03 -62 SVO
-75 8.6 2424777 1926-09-18 2424841 1926-11-21 -64 SVO
-74 8.4 2425041 1927-06-09 2425105 1927-08-12 -64 SVO
-73 8.3 2425302 1928-02-25 2425369 1928-05-02 -67 SVO
-72 8.3 2425554 1928-11-03 2425632 1929-01-20 -78 SVO
-71 8.1 2425811 1929-07-18 2425896 1929-10-11 -85 SVO
-70 9.3 2426081 1930-04-14 2426160 1930-07-02 -79 SVO
-69 8.9 2426349 1931-01-07 2426423 1931-03-22 -74 SVO
-68 8.9 2426614 1931-09-29 2426687 1931-12-11 -73 SVO
-67 9.0 2426887 1932-06-28 2426951 1932-08-31 -64 SVO
-66 7.7 2427148 1933-03-16 2427214 1933-05-21 -66 SVO
-65 8.8 2427414 1933-12-07 2427478 1934-02-09 -64 SVO
-64 8.4 2427672 1934-08-22 2427742 1934-10-31 -70 SVO
-63 8.5 2427936 1935-05-13 2428006 1935-07-22 -70 SVO
-62 8.6 2428201 1936-02-02 2428269 1936-04-10 -68 SVO
-61 7.9 2428463 1936-10-21 2428533 1936-12-30 -70 SVO
-60 9.2 2428731 1937-07-16 2428797 1937-09-20 -66 SVO
-59 9.3 2428996 1938-04-07 2429060 1938-06-10 -64 AAVSO
-58 8.8 2429260 1938-12-27 2429324 1939-03-01 -64 SVO
-57 9.1 2429522 1939-09-15 2429588 1939-11-20 -66 SVO
-56 8.6 2429793 1940-06-12 2429851 1940-08-09 -58 SVO
-55 8.2 2430050 1941-02-24 2430115 1941-04-30 -65 SVO
-54 8.6 2430326 1941-11-27 2430379 1942-01-19 -53 SVO
-53 8.3 2430586 1942-08-14 2430642 1942-10-09 -56 SVO
-52 10.0 2430851 1943-05-06 2430906 1943-06-30 -55 AAVSO
-51 8.2 2431108 1944-01-18 2431170 1944-03-20 -62 SVO
-50 8.3 2431388 1944-10-24 2431434 1944-12-09 -46 SVO
-49 8.2 2431668 1945-07-31 2431697 1945-08-29 -29 SVO
-48 8.2 2431907 1946-03-27 2431961 1946-05-20 -54 AAVSO
-47 8.0 2432175 1946-12-20 2432225 1947-02-08 -50 AAVSO
-46 8.9 2432473 1947-10-14 2432488 1947-10-29 -15 SVO
-45 8.2 2432738 1948-07-05 2432752 1948-07-19 -14 SVO
-44 8.5 2432997 1949-03-21 2433016 1949-04-09 -19 AAVSO
-43 8.0 2433278 1949-12-27 2433279 1949-12-28 -1 SVO
-42 8.1 2433553 1950-09-28 2433543 1950-09-18 10 SVO
-41 9.2 2433825 1951-06-27 2433807 1951-06-09 18 SVO
-40 8.6 2434077 1952-03-05 2434070 1952-02-27 7 SVO
-39 9.3 2434344 1952-11-27 2434334 1952-11-17 10 SVO
-38 8.5 2434603 1953-08-13 2434598 1953-08-08 5 SVO
-37 8.7 2434870 1954-05-07 2434861 1954-04-28 9 AAVSO
-36 8.4 2435133 1955-01-25 2435125 1955-01-17 8 SVO
-35 8.1 2435396 1955-10-15 2435389 1955-10-08 7 SVO
-34 8.2 2435656 1956-07-01 2435653 1956-06-28 3 SVO
-33 8.4 2435930 1957-04-01 2435916 1957-03-18 14 SVO
-32 8.5 2436185 1957-12-12 2436180 1957-12-07 5 SVO
-31 8.0 2436469 1958-09-22 2436444 1958-08-28 25 SVO
-30 8.9 2436741 1959-06-21 2436707 1959-05-18 34 SVO
-29 8.5 2437005 1960-03-11 2436971 1960-02-06 34 AAVSO
-28 9.2 2437263 1960-11-24 2437235 1960-10-27 28 SVO
-27 8.8 2437525 1961-08-13 2437498 1961-07-17 27 SVO
-26 7.8 2437783 1962-04-28 2437762 1962-04-07 21 SVO
-25 8.7 2438055 1963-01-25 2438026 1962-12-27 29 SVO
-24 8.8 2438322 1963-10-19 2438289 1963-09-16 33 SVO
-23 8.5 2438592 1964-07-15 2438553 1964-06-06 39 SVO
-22 8.2 2438863 1965-04-12 2438817 1965-02-25 46 SVO
-21 8.6 2439117 1965-12-22 2439081 1965-11-16 36 SVO
-20 8.3 2439373 1966-09-04 2439344 1966-08-06 29 SVO
-19 9.1 2439635 1967-05-24 2439608 1967-04-27 27 SVO
-18 9.0 2439895 1968-02-08 2439872 1968-01-16 23 SVO
-17 8.2 2440151 1968-10-21 2440135 1968-10-05 16 SVO
-16 9.2 2440416 1969-07-13 2440399 1969-06-26 17 SVO
-15 9.2 2440682 1970-04-05 2440663 1970-03-17 19 SVO
-14 9.2 2440941 1970-12-20 2440926 1970-12-05 15 SVO
-13 8.9 2441211 1971-09-16 2441190 1971-08-26 21 SVO
-12 8.6 2441469 1972-05-31 2441454 1972-05-16 15 SVO
-11 8.7 2441719 1973-02-05 2441717 1973-02-03 2 SVO
-10 8.8 2441980 1973-10-24 2441981 1973-10-25 -1 SVO
-9 9.3 2442241 1974-07-12 2442245 1974-07-16 -4 SVO
-8 9.1 2442492 1975-03-20 2442508 1975-04-05 -16 SVO
-7 8.8 2442762 1975-12-15 2442772 1975-12-25 -10 SVO
-6 9.2 2443031 1976-09-09 2443036 1976-09-14 -5 SVO
-5 8.7 2443289 1977-05-25 2443300 1977-06-05 -11 SVO
-4 8.4 2443552 1978-02-12 2443563 1978-02-23 -11 SVO
-3 8.2 2443817 1978-11-04 2443827 1978-11-14 -10 SVO
-2 8.6 2444085 1979-07-30 2444091 1979-08-05 -6 SVO
-1 8.6 2444360 1980-04-30 2444354 1980-04-24 6 SVO
0 8.6 2444624 1981-01-19 2444618 1981-01-13 6 SVO
1 8.4 2444888 1981-10-10 2444882 1981-10-04 6 SVO
2 9.1 2445157 1982-07-06 2445145 1982-06-24 12 SVO
3 9.1 2445424 1983-03-30 2445409 1983-03-15 15 SVO
4 8.5 2445677 1983-12-08 2445673 1983-12-04 4 SVO
5 8.8 2445948 1984-09-04 2445936 1984-08-23 12 SVO
6 8.4 2446202 1985-05-16 2446200 1985-05-14 2 SVO
7 9.2 2446470 1986-02-08 2446464 1986-02-02 6 SVO
8 8.8 2446732 1986-10-28 2446728 1986-10-24 4 SVO
9 8.5 2446999 1987-07-22 2446991 1987-07-14 8 SVO
10 8.1 2447239 1988-03-18 2447255 1988-04-03 -16 SVO
11 9.2 2447518 1988-12-22 2447519 1988-12-23 -1 SVO
12 8.3 2447777 1989-09-07 2447782 1989-09-12 -5 SVO
13 8.8 2448050 1990-06-07 2448046 1990-06-03 4 SVO
14 8.8 2448315 1991-02-27 2448310 1991-02-22 5 SVO
15 8.4 2448577 1991-11-16 2448573 1991-11-12 4 SVO
16 9.2 2448844 1992-08-09 2448837 1992-08-02 7 SVO
17 8.6 2449104 1993-04-26 2449101 1993-04-23 3 SVO
18 8.7 2449371 1994-01-18 2449364 1994-01-11 7 SVO
19 9.2 2449638 1994-10-12 2449628 1994-10-02 10 SVO
20 8.5 2449899 1995-06-30 2449892 1995-06-23 7 SVO
21 9.3 2450165 1996-03-22 2450155 1996-03-12 10 SVO
22 9.8 2450434 1996-12-16 2450419 1996-12-01 15 SVO
23 8.6 2450680 1997-08-19 2450683 1997-08-22 -3 SVO
24 9.2 2450959 1998-05-25 2450947 1998-05-13 12 SVO
25 8.8 2451229 1999-02-19 2451210 1999-01-31 19 SVO
26 8.8 2451491 1999-11-08 2451474 1999-10-22 17 SVO
27 8.6 2451750 2000-07-24 2451738 2000-07-12 12 SVO
28 8.5 2452018 2001-04-18 2452001 2001-04-01 17 SVO
29 8.6 2452285 2002-01-10 2452265 2001-12-21 20 SVO
30 8.6 2452543 2002-09-25 2452529 2002-09-11 14 SVO
31 8.5 2452795 2003-06-04 2452792 2003-06-01 3 SVO
32 9.1 2453058 2004-02-22 2453056 2004-02-20 2 SVO
33 8.3 2453314 2004-11-04 2453320 2004-11-10 -6 SVO
34 9.2 2453572 2005-07-20 2453583 2005-07-31 -11 SVO
35 8.7 2453830 2006-04-04 2453847 2006-04-21 -17 SVO
36 9.4 2454092 2006-12-22 2454111 2007-01-10 -19 SVO
37 8.8 2454357 2007-09-13 2454375 2007-10-01 -18 SVO
38 8.1 2454623 2008-06-05 2454638 2008-06-20 -15 SVO
39 9.5 2454891 2009-02-28 2454902 2009-03-11 -11 SVO
40 8.9 2455148 2009-11-12 2455166 2009-11-30 -18 SVO
41 8.7 2455427 2010-08-18 2455429 2010-08-20 -2 SVO
42 8.8 2455681 2011-04-29 2455693 2011-05-11 -12 SVO
43 8.0 2455940 2012-01-13 2455957 2012-01-30 -17 SVO
44 9.1 2456208 2012-10-07 2456220 2012-10-19 -12 SVO
45 8.8 2456470 2013-06-26 2456484 2013-07-10 -14 SVO
46 9.2 2456735 2014-03-18 2456748 2014-03-31 -13 SVO
47 8.3 2456987 2014-11-25 2457011 2014-12-19 -24 SVO
48 8.1 2457252 2015-08-17 2457275 2015-09-09 -23 SVO
49 8.5 2457520 2016-05-11 2457539 2016-05-30 -19 SVO
50 8.2 2457780 2017-01-26 2457803 2017-02-18 -23 SVO
51 9.1 2458052 2017-10-25 2458066 2017-11-08 -14 SVO
52 8.8 2458313 2018-07-13 2458330 2018-07-30 -17 SVO


E Cycle number from the GCVS4 epoch.
Mag Magnitude at maximum.
O (JD) Julian date at observed time for maximum.
O (Dat) Same as above, expressed as date.
C (JD) Julian date at calculated time for maximum with elements from GCVS4.
C (Dat) Same as above, expressed as date.
O-C O (JD) minus C (JD).
Sorce Datasource for the maxima.