Maxima for RY Oph
Period: 150.43, Epoch: 2445195.1
AAVSO offset: 1

E Mag O (JD) O (dat) C (JD) C (Dat) O-C Source
-202   2414790 1899-05-15 2414809 1899-06-03 -19 AnHar, 1952, vol 115
-199   2415235 1900-08-03 2415260 1900-08-28 -25 AnHar, 1952, vol 115
-197   2415535 1901-05-30 2415561 1901-06-25 -26 AnHar, 1952, vol 115
-194   2415990 1902-08-28 2416012 1902-09-19 -22 AnHar, 1952, vol 115
-192   2416280 1903-06-14 2416313 1903-07-17 -33 AnHar, 1952, vol 115
-190   2416590 1904-04-19 2416614 1904-05-13 -24 AnHar, 1952, vol 115
-189   2416740 1904-09-16 2416764 1904-10-10 -24 AnHar, 1952, vol 115
-187   2417055 1905-07-28 2417065 1905-08-07 -10 AnHar, 1952, vol 115
-185   2417358 1906-05-27 2417366 1906-06-04 -8 AnHar, 1952, vol 115, AnHar, 1937, vol 105, p 459
-184   2417505 1906-10-21 2417516 1906-11-01 -11 AnHar, 1909, vol 55, p 95
-183   2417660 1907-03-25 2417667 1907-04-01 -7 GuL, 1920, 1.2
-182   2417809 1907-08-21 2417817 1907-08-29 -8 AAVSO
-180 8.4 2418115 1908-06-22 2418118 1908-06-25 -3 AAVSO
-179   2418278 1908-12-02 2418269 1908-11-23 9 AAVSO
-178 8.5 2418416 1909-04-19 2418419 1909-04-22 -3 AAVSO
-177 8.5 2418567 1909-09-17 2418569 1909-09-19 -2 AAVSO
-175 8.0 2418882 1910-07-29 2418870 1910-07-17 12 AAVSO
-173   2419159 1911-05-02 2419171 1911-05-14 -12 AAVSO
-172   2419313 1911-10-03 2419322 1911-10-12 -9 AAVSO
-170   2419628 1912-08-13 2419622 1912-08-07 6 AAVSO
-168 7.6 2419917 1913-05-29 2419923 1913-06-04 -6 AAVSO
-167 8.0 2420068 1913-10-27 2420074 1913-11-02 -6 AAVSO
-165 8.0 2420372 1914-08-27 2420375 1914-08-30 -3 AAVSO
-163 8.5 2420669 1915-06-20 2420675 1915-06-26 -6 AAVSO
-162   2420823 1915-11-21 2420826 1915-11-24 -3 AAVSO
-161 8.0 2420975 1916-04-21 2420976 1916-04-22 -1 AAVSO
-160 8.2 2421127 1916-09-20 2421127 1916-09-20 0 SVO
-159 8.0 2421281 1917-02-21 2421277 1917-02-17 4 SVO
-158 8.2 2421437 1917-07-27 2421428 1917-07-18 9 SVO
-157 8.3 2421579 1917-12-16 2421578 1917-12-15 1 SVO
-156 8.2 2421729 1918-05-15 2421728 1918-05-14 1 SVO
-155 8.2 2421887 1918-10-20 2421879 1918-10-12 8 SVO
-154 8.5 2422040 1919-03-22 2422029 1919-03-11 11 SVO
-153 8.1 2422187 1919-08-16 2422180 1919-08-09 7 SVO
-152 8.0 2422339 1920-01-15 2422330 1920-01-06 9 SVO
-151 8.0 2422482 1920-06-06 2422481 1920-06-05 1 SVO
-150 8.5 2422638 1920-11-09 2422631 1920-11-02 7 SVO
-149 8.3 2422789 1921-04-09 2422781 1921-04-01 8 SVO
-148 8.8 2422944 1921-09-11 2422932 1921-08-30 12 SVO
-147 8.2 2423086 1922-01-31 2423082 1922-01-27 4 AAVSO
-146 8.4 2423241 1922-07-05 2423233 1922-06-27 8 SVO
-145 8.1 2423393 1922-12-04 2423383 1922-11-24 10 SVO
-144 8.3 2423542 1923-05-02 2423534 1923-04-24 8 SVO
-143 8.2 2423696 1923-10-03 2423684 1923-09-21 12 SVO
-142 8.2 2423839 1924-02-23 2423834 1924-02-18 5 SVO
-141 9.2 2423998 1924-07-31 2423985 1924-07-18 13 SVO
-140 8.0 2424141 1924-12-21 2424135 1924-12-15 6 SVO
-139 8.9 2424296 1925-05-25 2424286 1925-05-15 10 SVO
-138 8.3 2424448 1925-10-24 2424436 1925-10-12 12 SVO
-137 8.1 2424590 1926-03-15 2424587 1926-03-12 3 SVO
-136 9.0 2424749 1926-08-21 2424737 1926-08-09 12 SVO
-135 8.4 2424902 1927-01-21 2424887 1927-01-06 15 SVO
-134 8.0 2425042 1927-06-10 2425038 1927-06-06 4 SVO
-133 8.3 2425200 1927-11-15 2425188 1927-11-03 12 SVO
-132 8.3 2425349 1928-04-12 2425339 1928-04-02 10 SVO
-131 8.4 2425501 1928-09-11 2425489 1928-08-30 12 SVO
-130 8.1 2425646 1929-02-03 2425640 1929-01-28 6 SVO
-129 8.9 2425804 1929-07-11 2425790 1929-06-27 14 SVO
-128 8.7 2425952 1929-12-06 2425940 1929-11-24 12 SVO
-127 7.8 2426095 1930-04-28 2426091 1930-04-24 4 SVO
-126 8.6 2426249 1930-09-29 2426241 1930-09-21 8 SVO
-125 8.1 2426393 1931-02-20 2426392 1931-02-19 1 SVO
-124 8.0 2426540 1931-07-17 2426542 1931-07-19 -2 SVO
-123 9.0 2426699 1931-12-23 2426693 1931-12-17 6 SVO
-122 8.4 2426846 1932-05-18 2426843 1932-05-15 3 SVO
-121 7.7 2426990 1932-10-09 2426993 1932-10-12 -3 SVO
-120 8.5 2427141 1933-03-09 2427144 1933-03-12 -3 SVO
-119 8.2 2427293 1933-08-08 2427294 1933-08-09 -1 SVO
-118 8.3 2427445 1934-01-07 2427445 1934-01-07 0 SVO
-117 8.1 2427594 1934-06-05 2427595 1934-06-06 -1 SVO
-116 8.3 2427742 1934-10-31 2427746 1934-11-04 -4 SVO
-115 7.8 2427896 1935-04-03 2427896 1935-04-03 0 AAVSO
-114 8.3 2428046 1935-08-31 2428046 1935-08-31 0 SVO
-113   2428194 1936-01-26 2428197 1936-01-29 -3 AAVSO
-112 8.4 2428343 1936-06-23 2428347 1936-06-27 -4 SVO
-111 8.4 2428500 1936-11-27 2428498 1936-11-25 2 SVO
-110 8.6 2428652 1937-04-28 2428648 1937-04-24 4 SVO
-109 7.9 2428796 1937-09-19 2428799 1937-09-22 -3 SVO
-108   2428941 1938-02-11 2428949 1938-02-19 -8 AAVSO
-107 8.1 2429089 1938-07-09 2429099 1938-07-19 -10 SVO
-106   2429246 1938-12-13 2429250 1938-12-17 -4 AAVSO
-105 8.6 2429389 1939-05-05 2429400 1939-05-16 -11 SVO
-104 8.7 2429541 1939-10-04 2429551 1939-10-14 -10 SVO
-103 8.2 2429691 1940-03-02 2429701 1940-03-12 -10 AAVSO
-102 8.1 2429837 1940-07-26 2429852 1940-08-10 -15 SVO
-101   2429984 1940-12-20 2430002 1941-01-07 -18 AAVSO
-100 8.5 2430144 1941-05-29 2430152 1941-06-06 -8 AAVSO
-99 8.6 2430291 1941-10-23 2430303 1941-11-04 -12 SVO
-98 8.0 2430444 1942-03-25 2430453 1942-04-03 -9 AAVSO
-97 8.1 2430596 1942-08-24 2430604 1942-09-01 -8 SVO
-95 8.3 2430894 1943-06-18 2430905 1943-06-29 -11 SVO
-94 8.5 2431056 1943-11-27 2431055 1943-11-26 1 AAVSO
-93 8.4 2431207 1944-04-26 2431205 1944-04-24 2 AAVSO
-92 8.2 2431347 1944-09-13 2431356 1944-09-22 -9 SVO
-91 8.1 2431496 1945-02-09 2431506 1945-02-19 -10 AAVSO
-90 8.4 2431645 1945-07-08 2431657 1945-07-20 -12 SVO
-89 7.8 2431797 1945-12-07 2431807 1945-12-17 -10 AAVSO
-88 8.3 2431945 1946-05-04 2431958 1946-05-17 -13 AAVSO
-87 8.5 2432098 1946-10-04 2432108 1946-10-14 -10 SVO
-86 8.1 2432249 1947-03-04 2432258 1947-03-13 -9 AAVSO
-85 8.8 2432400 1947-08-02 2432409 1947-08-11 -9 SVO
-84   2432546 1947-12-26 2432559 1948-01-08 -13 AAVSO
-83 8.2 2432694 1948-05-22 2432710 1948-06-07 -16 SVO
-82 8.8 2432851 1948-10-26 2432860 1948-11-04 -9 SVO
-81 8.3 2433001 1949-03-25 2433010 1949-04-03 -9 AAVSO
-80 8.1 2433149 1949-08-20 2433161 1949-09-01 -12 SVO
-79   2433301 1950-01-19 2433311 1950-01-29 -10 AAVSO
-78 8.2 2433451 1950-06-18 2433462 1950-06-29 -11 SVO
-77 9.1 2433604 1950-11-18 2433612 1950-11-26 -8 AAVSO
-76 8.2 2433758 1951-04-21 2433763 1951-04-26 -5 AAVSO
-75 7.8 2433905 1951-09-15 2433913 1951-09-23 -8 SVO
-74 9.0 2434059 1952-02-16 2434063 1952-02-20 -4 AAVSO
-73 8.2 2434210 1952-07-16 2434214 1952-07-20 -4 SVO
-72 8.2 2434356 1952-12-09 2434364 1952-12-17 -8 AAVSO
-71 8.0 2434507 1953-05-09 2434515 1953-05-17 -8 AAVSO
-70 8.3 2434659 1953-10-08 2434665 1953-10-14 -6 SVO
-69 8.0 2434814 1954-03-12 2434816 1954-03-14 -2 AAVSO
-68 9.1 2434966 1954-08-11 2434966 1954-08-11 0 SVO
-67   2435111 1955-01-03 2435116 1955-01-08 -5 AAVSO
-66 8.8 2435262 1955-06-03 2435267 1955-06-08 -5 AAVSO
-65 8.0 2435411 1955-10-30 2435417 1955-11-05 -6 AAVSO
-64 9.0 2435561 1956-03-28 2435568 1956-04-04 -7 AAVSO
-63 8.4 2435715 1956-08-29 2435718 1956-09-01 -3 SVO
-62   2435863 1957-01-24 2435869 1957-01-30 -6 AAVSO
-61 8.6 2436022 1957-07-02 2436019 1957-06-29 3 SVO
-60 8.5 2436170 1957-11-27 2436169 1957-11-26 1 AAVSO
-59 8.0 2436319 1958-04-25 2436320 1958-04-26 -1 AAVSO
-58 8.7 2436479 1958-10-02 2436470 1958-09-23 9 SVO
-57 8.0 2436626 1959-02-26 2436621 1959-02-21 5 AAVSO
-56 8.6 2436781 1959-07-31 2436771 1959-07-21 10 SVO
-55   2436931 1959-12-28 2436922 1959-12-19 9 AAVSO
-54 9.0 2437082 1960-05-27 2437072 1960-05-17 10 AAVSO
-53 8.3 2437229 1960-10-21 2437222 1960-10-14 7 AAVSO
-52   2437377 1961-03-18 2437373 1961-03-14 4 AAVSO
-51 7.9 2437528 1961-08-16 2437523 1961-08-11 5 SVO
-50   2437681 1962-01-16 2437674 1962-01-09 7 AAVSO
-49 8.4 2437831 1962-06-15 2437824 1962-06-08 7 SVO
-48 9.3 2437980 1962-11-11 2437975 1962-11-06 5 AAVSO
-47 8.5 2438131 1963-04-11 2438125 1963-04-05 6 AAVSO
-46 8.0 2438281 1963-09-08 2438275 1963-09-02 6 SVO
-45 8.8 2438446 1964-02-20 2438426 1964-01-31 20 AAVSO
-44 8.5 2438590 1964-07-13 2438576 1964-06-29 14 SVO
-43 7.5 2438735 1964-12-05 2438727 1964-11-27 8 AAVSO
-42 8.0 2438891 1965-05-10 2438877 1965-04-26 14 AAVSO
-41 8.1 2439042 1965-10-08 2439028 1965-09-24 14 SVO
-40 8.2 2439191 1966-03-06 2439178 1966-02-21 13 AAVSO
-39 8.3 2439342 1966-08-04 2439328 1966-07-21 14 SVO
-38   2439491 1966-12-31 2439479 1966-12-19 12 AAVSO
-37 8.4 2439640 1967-05-29 2439629 1967-05-18 11 SVO
-36 8.2 2439789 1967-10-25 2439780 1967-10-16 9 SVO
-35 8.8 2439941 1968-03-25 2439930 1968-03-14 11 AAVSO
-34 8.6 2440092 1968-08-23 2440081 1968-08-12 11 SVO
-33 8.0 2440244 1969-01-22 2440231 1969-01-09 13 AAVSO
-32 8.5 2440392 1969-06-19 2440381 1969-06-08 11 SVO
-31 8.0 2440542 1969-11-16 2440532 1969-11-06 10 SVO
-30 8.8 2440692 1970-04-15 2440682 1970-04-05 10 SVO
-29 8.2 2440841 1970-09-11 2440833 1970-09-03 8 SVO
-28   2440993 1971-02-10 2440983 1971-01-31 10 AAVSO
-27 8.1 2441140 1971-07-07 2441134 1971-07-01 6 SVO
-26   2441292 1971-12-06 2441284 1971-11-28 8 AAVSO
-25 8.5 2441449 1972-05-11 2441434 1972-04-26 15 SVO
-24 9.2 2441599 1972-10-08 2441585 1972-09-24 14 AAVSO
-23 8.1 2441747 1973-03-05 2441735 1973-02-21 12 AAVSO
-22 8.5 2441899 1973-08-04 2441886 1973-07-22 13 SVO
-21   2442046 1973-12-29 2442036 1973-12-19 10 AAVSO
-20 8.5 2442201 1974-06-02 2442187 1974-05-19 14 SVO
-19 8.0 2442344 1974-10-23 2442337 1974-10-16 7 SVO
-18 8.8 2442494 1975-03-22 2442487 1975-03-15 7 AAVSO
-17 8.2 2442642 1975-08-17 2442638 1975-08-13 4 SVO
-16   2442792 1976-01-14 2442788 1976-01-10 4 AAVSO
-15 8.8 2442953 1976-06-23 2442939 1976-06-09 14 SVO
-14 8.3 2443099 1976-11-16 2443089 1976-11-06 10 AAVSO
-13 8.0 2443244 1977-04-10 2443240 1977-04-06 4 SVO
-12 8.7 2443399 1977-09-12 2443390 1977-09-03 9 SVO
-11 9.9 2443550 1978-02-10 2443540 1978-01-31 10 AAVSO
-10 8.7 2443705 1978-07-15 2443691 1978-07-01 14 SVO
-9 8.3 2443850 1978-12-07 2443841 1978-11-28 9 SVO
-8 8.1 2444000 1979-05-06 2443992 1979-04-28 8 SVO
-7 8.2 2444155 1979-10-08 2444142 1979-09-25 13 SVO
-6 8.1 2444303 1980-03-04 2444293 1980-02-23 10 SVO
-5 9.0 2444456 1980-08-04 2444443 1980-07-22 13 SVO
-4 8.5 2444612 1981-01-07 2444593 1980-12-19 19 SVO
-3 8.3 2444759 1981-06-03 2444744 1981-05-19 15 SVO
-2 8.4 2444906 1981-10-28 2444894 1981-10-16 12 SVO
-1 8.4 2445058 1982-03-29 2445045 1982-03-16 13 SVO
0 8.6 2445207 1982-08-25 2445195 1982-08-13 12 SVO
1 8.0 2445354 1983-01-19 2445346 1983-01-11 8 AAVSO
2 9.0 2445509 1983-06-23 2445496 1983-06-10 13 SVO
3 9.0 2445656 1983-11-17 2445646 1983-11-07 10 AAVSO
4 8.4 2445809 1984-04-18 2445797 1984-04-06 12 SVO
5 8.3 2445958 1984-09-14 2445947 1984-09-03 11 SVO
6 8.4 2446105 1985-02-08 2446098 1985-02-01 7 AAVSO
7 8.6 2446255 1985-07-08 2446248 1985-07-01 7 SVO
8 8.9 2446404 1985-12-04 2446399 1985-11-29 5 AAVSO
9 8.6 2446558 1986-05-07 2446549 1986-04-28 9 SVO
10 8.3 2446705 1986-10-01 2446699 1986-09-25 6 SVO
11 7.9 2446851 1987-02-24 2446850 1987-02-23 1 SVO
12 9.0 2447008 1987-07-31 2447000 1987-07-23 8 SVO
13 8.2 2447150 1987-12-20 2447151 1987-12-21 -1 SVO
14 8.3 2447303 1988-05-21 2447301 1988-05-19 2 SVO
15 8.2 2447452 1988-10-17 2447452 1988-10-17 0 SVO
16 8.7 2447607 1989-03-21 2447602 1989-03-16 5 SVO
17 8.1 2447754 1989-08-15 2447752 1989-08-13 2 SVO
18   2447903 1990-01-11 2447903 1990-01-11 0 AAVSO
19 8.0 2448048 1990-06-05 2448053 1990-06-10 -5 SVO
20 8.6 2448202 1990-11-06 2448204 1990-11-08 -2 SVO
21 9.0 2448357 1991-04-10 2448354 1991-04-07 3 SVO
22 8.4 2448508 1991-09-08 2448505 1991-09-05 3 SVO
23   2448657 1992-02-04 2448655 1992-02-02 2 AAVSO
24 8.0 2448806 1992-07-02 2448805 1992-07-01 1 SVO
25   2448959 1992-12-02 2448956 1992-11-29 3 AAVSO
26 8.2 2449098 1993-04-20 2449106 1993-04-28 -8 SVO
27 8.8 2449250 1993-09-19 2449257 1993-09-26 -7 SVO
28 8.4 2449403 1994-02-19 2449407 1994-02-23 -4 SVO
29 9.0 2449552 1994-07-18 2449558 1994-07-24 -6 SVO
30 8.3 2449696 1994-12-09 2449708 1994-12-21 -12 SVO
31 8.7 2449851 1995-05-13 2449858 1995-05-20 -7 SVO
32 8.1 2450004 1995-10-13 2450009 1995-10-18 -5 SVO
33 8.5 2450155 1996-03-12 2450159 1996-03-16 -4 SVO
34 8.2 2450307 1996-08-11 2450310 1996-08-14 -3 SVO
35 8.2 2450455 1997-01-06 2450460 1997-01-11 -5 SVO
36 8.0 2450601 1997-06-01 2450611 1997-06-11 -10 SVO
37 8.1 2450753 1997-10-31 2450761 1997-11-08 -8 SVO
38 8.9 2450906 1998-04-02 2450911 1998-04-07 -5 SVO
39 8.6 2451057 1998-08-31 2451062 1998-09-05 -5 SVO
40   2451209 1999-01-30 2451212 1999-02-02 -3 AAVSO
41 7.9 2451352 1999-06-22 2451363 1999-07-03 -11 SVO
42 8.7 2451506 1999-11-23 2451513 1999-11-30 -7 SVO
43 8.2 2451653 2000-04-18 2451664 2000-04-29 -11 SVO
44 9.0 2451812 2000-09-24 2451814 2000-09-26 -2 SVO
45 8.5 2451962 2001-02-21 2451964 2001-02-23 -2 SVO
46 8.5 2452112 2001-07-21 2452115 2001-07-24 -3 SVO
47 8.4 2452264 2001-12-20 2452265 2001-12-21 -1 SVO
48 8.3 2452414 2002-05-19 2452416 2002-05-21 -2 SVO
49 8.3 2452570 2002-10-22 2452566 2002-10-18 4 SVO
50 8.6 2452717 2003-03-18 2452717 2003-03-18 0 SVO
51 7.9 2452863 2003-08-11 2452867 2003-08-15 -4 SVO
52   2453016 2004-01-11 2453017 2004-01-12 -1 AAVSO
53 8.5 2453171 2004-06-14 2453168 2004-06-11 3 SVO
54 8.2 2453316 2004-11-06 2453318 2004-11-08 -2 SVO
55 8.8 2453475 2005-04-14 2453469 2005-04-08 6 SVO
56 8.2 2453619 2005-09-05 2453619 2005-09-05 0 SVO
57   2453775 2006-02-08 2453770 2006-02-03 5 AAVSO
58 8.1 2453924 2006-07-07 2453920 2006-07-03 4 SVO
59 8.6 2454073 2006-12-03 2454070 2006-11-30 3 SVO
60 8.6 2454223 2007-05-02 2454221 2007-04-30 2 SVO
61 8.0 2454367 2007-09-23 2454371 2007-09-27 -4 SVO
62 8.7 2454522 2008-02-25 2454522 2008-02-25 0 SVO
63 8.8 2454676 2008-07-28 2454672 2008-07-24 4 SVO
64 8.0 2454821 2008-12-20 2454823 2008-12-22 -2 SVO
65 8.7 2454971 2009-05-19 2454973 2009-05-21 -2 SVO
66 8.4 2455118 2009-10-13 2455123 2009-10-18 -5 SVO
67 8.8 2455269 2010-03-13 2455274 2010-03-18 -5 SVO
68 8.6 2455426 2010-08-17 2455424 2010-08-15 2 SVO
69 9.1 2455578 2011-01-16 2455575 2011-01-13 3 AAVSO
70 8.2 2455721 2011-06-08 2455725 2011-06-12 -4 SVO
71 8.5 2455870 2011-11-04 2455875 2011-11-09 -5 AAVSO
72 8.5 2456026 2012-04-08 2456026 2012-04-08 0 SVO
73 8.4 2456176 2012-09-05 2456176 2012-09-05 0 SVO
74 8.7 2456328 2013-02-04 2456327 2013-02-03 1 AAVSO
75 8.0 2456470 2013-06-26 2456477 2013-07-03 -7 SVO
76 8.4 2456621 2013-11-24 2456628 2013-12-01 -7 AAVSO
77 8.5 2456769 2014-04-21 2456778 2014-04-30 -9 SVO
78 9.1 2456926 2014-09-25 2456928 2014-09-27 -2 SVO
79 8.3 2457071 2015-02-17 2457079 2015-02-25 -8 SVO
80 8.0 2457219 2015-07-15 2457229 2015-07-25 -10 SVO
81 8.6 2457372 2015-12-15 2457380 2015-12-23 -8 SVO
82 9.0 2457524 2016-05-15 2457530 2016-05-21 -6 SVO
83 7.8 2457666 2016-10-04 2457681 2016-10-19 -15 SVO
84 9.2 2457823 2017-03-10 2457831 2017-03-18 -8 SVO
85 8.9 2457982 2017-08-16 2457981 2017-08-15 1 SVO
86 8.1 2458118 2017-12-30 2458132 2018-01-13 -14 SVO
87 8.7 2458275 2018-06-05 2458282 2018-06-12 -7 SVO
88 8.4 2458427 2018-11-04 2458433 2018-11-10 -6 SVO
89 8.0 2458575 2019-04-01 2458583 2019-04-09 -8 SVO
90 8.7 2458728 2019-09-01 2458734 2019-09-07 -6 SVO
91   2458875 2020-01-26 2458884 2020-02-04 -9 SVO
92 7.8 2459021 2020-06-20 2459034 2020-07-03 -13 SVO
93 8.8 2459173 2020-11-19 2459185 2020-12-01 -12 SVO
94 8.4 2459324 2021-04-19 2459335 2021-04-30 -11 SVO
95 8.0 2459468 2021-09-10 2459486 2021-09-28 -18 SVO
96 8.7 2459620 2022-02-09 2459636 2022-02-25 -16 SVO
97 8.3 2459767 2022-07-06 2459787 2022-07-26 -20 SVO
98 8.9 2459922 2022-12-08 2459937 2022-12-23 -15 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.