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Maxima for SS Cas

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Period: 140.57, Epoch: 2444208
Back to main page  Mean light curve  Period diagram

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E	Mag	O (JD)	O (dat)	C (JD)	C (Dat)	O-C	Source
-232		2411755	1891-01-22	2411596	1890-08-16	159	SVO
-230		2412040	1891-11-03	2411877	1891-05-24	163	SVO
-217		2413865	1896-11-01	2413704	1896-05-24	161	SVO
-215		2414140	1897-08-03	2413985	1897-03-01	155	SVO
-206		2415405	1901-01-20	2415251	1900-08-19	154	SVO
-204		2415682	1901-10-24	2415532	1901-05-27	150	SVO
-202		2415960	1902-07-29	2415813	1902-03-04	147	SVO
-201		2416103	1902-12-19	2415953	1902-07-22	150	SVO
-199		2416375	1903-09-17	2416235	1903-04-30	140	SVO
-198		2416520	1904-02-09	2416375	1903-09-17	145	SVO
-197		2416665	1904-07-03	2416516	1904-02-05	149	SVO
-196		2416810	1904-11-25	2416656	1904-06-24	154	SVO
-194		2417082	1905-08-24	2416937	1905-04-01	145	AnHar, 1909, vol 55, p 95
-191		2417504	1906-10-20	2417359	1906-05-28	145	AnHar, 1909, vol 55, p 95
-190		2417640	1907-03-05	2417500	1906-10-16	140	GuL, 1918, 1.1
-189		2417777	1907-07-20	2417640	1907-03-05	137	GuL, 1918, 1.1
-188		2417927	1907-12-17	2417781	1907-07-24	146	SVO
-186		2418200	1908-09-15	2418062	1908-04-30	138	SVO
-185		2418330	1909-01-23	2418203	1908-09-18	127	SVO
-183		2418618	1909-11-07	2418484	1909-06-26	134	SVO
-180		2419024	1910-12-18	2418905	1910-08-21	119	SVO
-178		2419305	1911-09-25	2419187	1911-05-30	118	SVO
-177		2419435	1912-02-02	2419327	1911-10-17	108	SVO
-175		2419721	1912-11-14	2419608	1912-07-24	113	SVO
-173		2419995	1913-08-15	2419889	1913-05-01	106	SVO
-172		2420140	1914-01-07	2420030	1913-09-19	110	SVO
-170		2420416	1914-10-10	2420311	1914-06-27	105	SVO
-169		2420555	1915-02-26	2420452	1914-11-15	103	SVO
-167		2420843	1915-12-11	2420733	1915-08-23	110	SVO
-165		2421118	1916-09-11	2421014	1916-05-30	104	SVO
-164		2421255	1917-01-26	2421155	1916-10-18	100	SVO
-162		2421547	1917-11-14	2421436	1917-07-26	111	SVO
-160		2421825	1918-08-19	2421717	1918-05-03	108	SVO
-159		2421962	1919-01-03	2421857	1918-09-20	105	SVO
-157		2422240	1919-10-08	2422139	1919-06-29	101	SVO
-156		2422380	1920-02-25	2422279	1919-11-16	101	SVO
-154		2422657	1920-11-28	2422560	1920-08-23	97	SVO
-152		2422929	1921-08-27	2422841	1921-05-31	88	SVO
-151		2423065	1922-01-10	2422982	1921-10-19	83	SVO
-149		2423349	1922-10-21	2423263	1922-07-27	86	SVO
-147		2423625	1923-07-24	2423544	1923-05-04	81	SVO
-146		2423759	1923-12-05	2423685	1923-09-22	74	SVO
-144		2424027	1924-08-29	2423966	1924-06-29	61	SVO
-143		2424170	1925-01-19	2424106	1924-11-16	64	SVO
-141		2424453	1925-10-29	2424388	1925-08-25	65	SVO
-139		2424726	1926-07-29	2424669	1926-06-02	57	SVO
-138		2424865	1926-12-15	2424809	1926-10-20	56	SVO
-136		2425150	1927-09-26	2425090	1927-07-28	60	SVO
-134		2425430	1928-07-02	2425372	1928-05-05	58	SVO
-133		2425574	1928-11-23	2425512	1928-09-22	62	SVO
-131		2425840	1929-08-16	2425793	1929-06-30	47	AN, 1936, vol 261, p 67
-130		2425985	1930-01-08	2425934	1929-11-18	51	AN, 1936, vol 261, p 67
-128		2426255	1930-10-05	2426215	1930-08-26	40	AN, 1936, vol 261, p 67
-125		2426675	1931-11-29	2426637	1931-10-22	38	AN, 1936, vol 261, p 67
-123		2426955	1932-09-04	2426918	1932-07-29	37	AN, 1936, vol 261, p 67
-122		2427090	1933-01-17	2427058	1932-12-16	32	SVO
-121		2427238	1933-06-14	2427199	1933-05-06	39	AN, 1936, vol 261, p 67
-120		2427366	1933-10-20	2427340	1933-09-24	26	AN, 1936, vol 261, p 67
-118		2427657	1934-08-07	2427621	1934-07-02	36	AN, 1935, vol 257, p 101
-117		2427800	1934-12-28	2427761	1934-11-19	39	SVO
-116		2427931	1935-05-08	2427902	1935-04-09	29	AAVSO
-115	9.7	2428077	1935-10-01	2428042	1935-08-27	35	SVO
-114	9.8	2428222	1936-02-23	2428183	1936-01-15	39	AAVSO
-113	9.8	2428369	1936-07-19	2428324	1936-06-04	45	SVO
-112	9.7	2428506	1936-12-03	2428464	1936-10-22	42	SVO
-111		2428646	1937-04-22	2428605	1937-03-12	41	AAVSO
-110	9.9	2428788	1937-09-11	2428745	1937-07-30	43	SVO
-109	9.9	2428937	1938-02-07	2428886	1937-12-18	51	SVO
-108	10.0	2429082	1938-07-02	2429026	1938-05-07	56	SVO
-107	9.6	2429218	1938-11-15	2429167	1938-09-25	51	SVO
-106		2429355	1939-04-01	2429308	1939-02-13	47	AAVSO
-105	9.5	2429501	1939-08-25	2429448	1939-07-03	53	SVO
-104	10.2	2429650	1940-01-21	2429589	1939-11-21	61	SVO
-103	10.4	2429791	1940-06-10	2429729	1940-04-09	62	AAVSO
-102	9.7	2429925	1940-10-22	2429870	1940-08-28	55	SVO
-101	9.9	2430064	1941-03-10	2430010	1941-01-15	54	AAVSO
-100	9.8	2430212	1941-08-05	2430151	1941-06-05	61	SVO
-99	9.8	2430348	1941-12-19	2430292	1941-10-24	56	SVO
-98	9.2	2430492	1942-05-12	2430432	1942-03-13	60	AAVSO
-97	10.2	2430633	1942-09-30	2430573	1942-08-01	60	SVO
-96	10.1	2430757	1943-02-01	2430713	1942-12-19	44	AAVSO
-95	10.1	2430914	1943-07-08	2430854	1943-05-09	60	SVO
-94	9.5	2431049	1943-11-20	2430994	1943-09-26	55	SVO
-93	9.7	2431190	1944-04-09	2431135	1944-02-14	55	AAVSO
-92	9.5	2431321	1944-08-18	2431276	1944-07-04	45	SVO
-91	9.9	2431460	1945-01-04	2431416	1944-11-21	44	SVO
-90	10.1	2431597	1945-05-21	2431557	1945-04-11	40	AAVSO
-89	10.1	2431732	1945-10-03	2431697	1945-08-29	35	AAVSO
-88	9.8	2431872	1946-02-20	2431838	1946-01-17	34	SVO
-87	9.5	2432016	1946-07-14	2431978	1946-06-06	38	SVO
-86	10.1	2432156	1946-12-01	2432119	1946-10-25	37	SVO
-84	9.9	2432434	1947-09-05	2432400	1947-08-02	34	SVO
-83	9.7	2432571	1948-01-20	2432541	1947-12-21	30	SVO
-82	9.6	2432708	1948-06-05	2432681	1948-05-09	27	SVO
-81	9.6	2432849	1948-10-24	2432822	1948-09-27	27	SVO
-80	9.5	2432989	1949-03-13	2432962	1949-02-14	27	AAVSO
-79	10.1	2433128	1949-07-30	2433103	1949-07-05	25	SVO
-78	9.6	2433261	1949-12-10	2433244	1949-11-23	17	SVO
-77	10.7	2433410	1950-05-08	2433384	1950-04-12	26	AAVSO
-76	10.0	2433545	1950-09-20	2433525	1950-08-31	20	SVO
-75	10.3	2433685	1951-02-07	2433665	1951-01-18	20	SVO
-74	10.0	2433828	1951-06-30	2433806	1951-06-08	22	AAVSO
-73	10.7	2433955	1951-11-04	2433946	1951-10-26	9	AAVSO
-72		2434103	1952-03-31	2434087	1952-03-15	16	AAVSO
-71	9.7	2434240	1952-08-15	2434228	1952-08-03	12	SVO
-70	9.8	2434378	1952-12-31	2434368	1952-12-21	10	SVO
-69		2434521	1953-05-23	2434509	1953-05-11	12	AAVSO
-68	10.0	2434663	1953-10-12	2434649	1953-09-28	14	SVO
-67	10.0	2434799	1954-02-25	2434790	1954-02-16	9	AAVSO
-66	10.3	2434940	1954-07-16	2434930	1954-07-06	10	AAVSO
-65	9.8	2435079	1954-12-02	2435071	1954-11-24	8	SVO
-64		2435222	1955-04-24	2435212	1955-04-14	10	AAVSO
-63	9.6	2435359	1955-09-08	2435352	1955-09-01	7	SVO
-62	9.8	2435500	1956-01-27	2435493	1956-01-20	7	SVO
-61	10.0	2435642	1956-06-17	2435633	1956-06-08	9	AAVSO
-60	10.0	2435787	1956-11-09	2435774	1956-10-27	13	SVO
-59	10.0	2435925	1957-03-27	2435914	1957-03-16	11	AAVSO
-58	9.9	2436062	1957-08-11	2436055	1957-08-04	7	SVO
-57	9.7	2436202	1957-12-29	2436196	1957-12-23	6	SVO
-56		2436342	1958-05-18	2436336	1958-05-12	6	AAVSO
-55	9.9	2436485	1958-10-08	2436477	1958-09-30	8	SVO
-54	9.8	2436627	1959-02-27	2436617	1959-02-17	10	SVO
-53	9.7	2436768	1959-07-18	2436758	1959-07-08	10	SVO
-52	9.8	2436910	1959-12-07	2436898	1959-11-25	12	SVO
-51	9.9	2437050	1960-04-25	2437039	1960-04-14	11	SVO
-50	9.7	2437191	1960-09-13	2437180	1960-09-02	11	SVO
-49	10.1	2437329	1961-01-29	2437320	1961-01-20	9	SVO
-48	10.0	2437477	1961-06-26	2437461	1961-06-10	16	SVO
-47	10.1	2437623	1961-11-19	2437601	1961-10-28	22	SVO
-46	9.8	2437760	1962-04-05	2437742	1962-03-18	18	SVO
-45	9.6	2437897	1962-08-20	2437882	1962-08-05	15	SVO
-44	10.0	2438038	1963-01-08	2438023	1962-12-24	15	SVO
-43	8.8	2438181	1963-05-31	2438163	1963-05-13	18	AAVSO
-42	9.8	2438322	1963-10-19	2438304	1963-10-01	18	SVO
-41	9.8	2438463	1964-03-08	2438445	1964-02-19	18	AAVSO
-40	9.9	2438605	1964-07-28	2438585	1964-07-08	20	SVO
-39	9.5	2438742	1964-12-12	2438726	1964-11-26	16	SVO
-38	10.0	2438885	1965-05-04	2438866	1965-04-15	19	AAVSO
-37	9.8	2439026	1965-09-22	2439007	1965-09-03	19	SVO
-36	9.7	2439167	1966-02-10	2439147	1966-01-21	20	SVO
-35	10.1	2439308	1966-07-01	2439288	1966-06-11	20	SVO
-34	9.6	2439444	1966-11-14	2439429	1966-10-30	15	SVO
-33		2439592	1967-04-11	2439569	1967-03-19	23	AAVSO
-32	9.8	2439731	1967-08-28	2439710	1967-08-07	21	SVO
-31	10.1	2439878	1968-01-22	2439850	1967-12-25	28	SVO
-30	9.2	2440015	1968-06-07	2439991	1968-05-14	24	AAVSO
-29	9.5	2440150	1968-10-20	2440131	1968-10-01	19	SVO
-28	9.7	2440292	1969-03-11	2440272	1969-02-19	20	AAVSO
-27	9.9	2440435	1969-08-01	2440413	1969-07-10	22	SVO
-26	9.5	2440574	1969-12-18	2440553	1969-11-27	21	SVO
-25	9.8	2440714	1970-05-07	2440694	1970-04-17	20	AAVSO
-24	9.8	2440852	1970-09-22	2440834	1970-09-04	18	SVO
-23	9.9	2440997	1971-02-14	2440975	1971-01-23	22	SVO
-22	9.6	2441143	1971-07-10	2441115	1971-06-12	28	AAVSO
-21	9.7	2441276	1971-11-20	2441256	1971-10-31	20	SVO
-20		2441417	1972-04-09	2441397	1972-03-20	20	AAVSO
-19	9.7	2441555	1972-08-25	2441537	1972-08-07	18	SVO
-18	9.9	2441698	1973-01-15	2441678	1972-12-26	20	SVO
-17	9.5	2441832	1973-05-29	2441818	1973-05-15	14	AAVSO
-16	9.7	2441972	1973-10-16	2441959	1973-10-03	13	SVO
-15	9.9	2442115	1974-03-08	2442099	1974-02-20	16	SVO
-14	9.6	2442252	1974-07-23	2442240	1974-07-11	12	SVO
-13	10.2	2442393	1974-12-11	2442381	1974-11-29	12	SVO
-12	9.7	2442528	1975-04-25	2442521	1975-04-18	7	SVO
-11	10.0	2442673	1975-09-17	2442662	1975-09-06	11	SVO
-10	9.8	2442813	1976-02-04	2442802	1976-01-24	11	SVO
-9	9.5	2442949	1976-06-19	2442943	1976-06-13	6	SVO
-8	9.6	2443091	1976-11-08	2443083	1976-10-31	8	SVO
-7	9.6	2443231	1977-03-28	2443224	1977-03-21	7	SVO
-6	10.1	2443373	1977-08-17	2443365	1977-08-09	8	SVO
-5	10.1	2443516	1978-01-07	2443505	1977-12-27	11	SVO
-4	9.6	2443654	1978-05-25	2443646	1978-05-17	8	AAVSO
-3	9.6	2443787	1978-10-05	2443786	1978-10-04	1	SVO
-2	9.9	2443929	1979-02-24	2443927	1979-02-22	2	SVO
-1	10.1	2444072	1979-07-17	2444067	1979-07-12	5	SVO
0	9.5	2444209	1979-12-01	2444208	1979-11-30	1	SVO
1	10.3	2444351	1980-04-21	2444349	1980-04-19	2	SVO
2	9.9	2444490	1980-09-07	2444489	1980-09-06	1	SVO
3	9.7	2444628	1981-01-23	2444630	1981-01-25	-2	SVO
4	9.8	2444768	1981-06-12	2444770	1981-06-14	-2	SVO
5	10.2	2444910	1981-11-01	2444911	1981-11-02	-1	SVO
6	9.9	2445052	1982-03-23	2445051	1982-03-22	1	SVO
7	9.9	2445186	1982-08-04	2445192	1982-08-10	-6	SVO
8	9.6	2445322	1982-12-18	2445333	1982-12-29	-11	SVO
9	10.0	2445464	1983-05-09	2445473	1983-05-18	-9	AAVSO
10	9.9	2445605	1983-09-27	2445614	1983-10-06	-9	SVO
11	9.7	2445739	1984-02-08	2445754	1984-02-23	-15	SVO
12	9.7	2445876	1984-06-24	2445895	1984-07-13	-19	SVO
13	10.0	2446017	1984-11-12	2446035	1984-11-30	-18	SVO
14	9.8	2446155	1985-03-30	2446176	1985-04-20	-21	SVO
15	10.0	2446292	1985-08-14	2446317	1985-09-08	-25	SVO
16	9.4	2446433	1986-01-02	2446457	1986-01-26	-24	SVO
17	10.5	2446574	1986-05-23	2446598	1986-06-16	-24	AAVSO
18	10.1	2446714	1986-10-10	2446738	1986-11-03	-24	SVO
19	9.5	2446845	1987-02-18	2446879	1987-03-24	-34	SVO
20	9.8	2446983	1987-07-06	2447019	1987-08-11	-36	SVO
21	9.9	2447124	1987-11-24	2447160	1987-12-30	-36	SVO
22	9.9	2447263	1988-04-11	2447301	1988-05-19	-38	SVO
23	9.9	2447405	1988-08-31	2447441	1988-10-06	-36	SVO
24	9.9	2447539	1989-01-12	2447582	1989-02-24	-43	SVO
25	9.7	2447675	1989-05-28	2447722	1989-07-14	-47	SVO
26	10.0	2447815	1989-10-15	2447863	1989-12-02	-48	SVO
27	9.8	2447953	1990-03-02	2448003	1990-04-21	-50	SVO
28	9.9	2448090	1990-07-17	2448144	1990-09-09	-54	SVO
29	9.8	2448224	1990-11-28	2448285	1991-01-28	-61	SVO
30	10.0	2448366	1991-04-19	2448425	1991-06-17	-59	SVO
31	9.8	2448510	1991-09-10	2448566	1991-11-05	-56	SVO
32	9.8	2448651	1992-01-29	2448706	1992-03-24	-55	SVO
33	9.7	2448791	1992-06-17	2448847	1992-08-12	-56	SVO
34	9.5	2448917	1992-10-21	2448987	1992-12-30	-70	SVO
35	9.7	2449059	1993-03-12	2449128	1993-05-20	-69	SVO
36	9.8	2449200	1993-07-31	2449269	1993-10-08	-69	SVO
37	10.0	2449342	1993-12-20	2449409	1994-02-25	-67	SVO
38		2449481	1994-05-08	2449550	1994-07-16	-69	AAVSO
39	9.8	2449622	1994-09-26	2449690	1994-12-03	-68	SVO
40	10.0	2449763	1995-02-14	2449831	1995-04-23	-68	SVO
41	9.6	2449897	1995-06-28	2449971	1995-09-10	-74	SVO
42	9.7	2450035	1995-11-13	2450112	1996-01-29	-77	SVO
43	10.0	2450175	1996-04-01	2450253	1996-06-18	-78	SVO
44	10.1	2450318	1996-08-22	2450393	1996-11-05	-75	SVO
45	9.8	2450460	1997-01-11	2450534	1997-03-26	-74	SVO
46	10.0	2450598	1997-05-29	2450674	1997-08-13	-76	SVO
47	9.8	2450731	1997-10-09	2450815	1998-01-01	-84	SVO
48	9.9	2450868	1998-02-23	2450955	1998-05-21	-87	SVO
49	10.0	2451010	1998-07-15	2451096	1998-10-09	-86	SVO
50	9.9	2451147	1998-11-29	2451237	1999-02-27	-90	SVO
51	9.9	2451282	1999-04-13	2451377	1999-07-17	-95	SVO
52	9.8	2451421	1999-08-30	2451518	1999-12-05	-97	SVO
53	10.2	2451567	2000-01-23	2451658	2000-04-23	-91	SVO
54	10.1	2451708	2000-06-12	2451799	2000-09-11	-91	SVO
55	9.7	2451841	2000-10-23	2451939	2001-01-29	-98	SVO
56	9.7	2451977	2001-03-08	2452080	2001-06-19	-103	SVO
57	10.1	2452118	2001-07-27	2452220	2001-11-06	-102	SVO
58	9.8	2452259	2001-12-15	2452361	2002-03-27	-102	SVO
59		2452397	2002-05-02	2452502	2002-08-15	-105	AAVSO
60	9.8	2452539	2002-09-21	2452642	2003-01-02	-103	SVO
61	10.2	2452680	2003-02-09	2452783	2003-05-23	-103	SVO
62	9.8	2452818	2003-06-27	2452923	2003-10-10	-105	SVO
63	9.6	2452960	2003-11-16	2453064	2004-02-28	-104	SVO
64	10.2	2453101	2004-04-05	2453204	2004-07-17	-103	SVO
65	9.9	2453248	2004-08-30	2453345	2004-12-05	-97	SVO
66	10.0	2453388	2005-01-17	2453486	2005-04-25	-98	SVO
67		2453520	2005-05-29	2453626	2005-09-12	-106	AAVSO
68	9.6	2453657	2005-10-13	2453767	2006-01-31	-110	SVO
69	9.9	2453797	2006-03-02	2453907	2006-06-20	-110	SVO
70	9.9	2453943	2006-07-26	2454048	2006-11-08	-105	SVO
71	10.0	2454084	2006-12-14	2454188	2007-03-28	-104	SVO
72	9.6	2454222	2007-05-01	2454329	2007-08-16	-107	SVO
73	9.7	2454358	2007-09-14	2454470	2008-01-04	-112	SVO
74	9.8	2454498	2008-02-01	2454610	2008-05-23	-112	SVO
75	9.6	2454633	2008-06-15	2454751	2008-10-11	-118	SVO
76	10.0	2454783	2008-11-12	2454891	2009-02-28	-108	SVO
77	9.8	2454926	2009-04-04	2455032	2009-07-19	-106	SVO
78	10.2	2455071	2009-08-27	2455172	2009-12-06	-101	SVO
79	9.3	2455206	2010-01-09	2455313	2010-04-26	-107	SVO
80	9.7	2455346	2010-05-29	2455454	2010-09-14	-108	SVO
81	10.1	2455488	2010-10-18	2455594	2011-02-01	-106	SVO
82	9.4	2455629	2011-03-08	2455735	2011-06-22	-106	SVO
83	10.0	2455774	2011-07-31	2455875	2011-11-09	-101	SVO
84	9.4	2455915	2011-12-19	2456016	2012-03-29	-101	SVO
85	9.5	2456056	2012-05-08	2456156	2012-08-16	-100	SVO
86	10.0	2456201	2012-09-30	2456297	2013-01-04	-96	SVO
87	9.5	2456338	2013-02-14	2456438	2013-05-25	-100	SVO
88	9.5	2456477	2013-07-03	2456578	2013-10-12	-101	SVO
89	9.7	2456621	2013-11-24	2456719	2014-03-02	-98	SVO
90	9.8	2456763	2014-04-15	2456859	2014-07-20	-96	SVO
91	9.6	2456904	2014-09-03	2457000	2014-12-08	-96	SVO
92	9.7	2457042	2015-01-19	2457140	2015-04-27	-98	SVO
93	9.8	2457181	2015-06-07	2457281	2015-09-15	-100	AAVSO
94	9.5	2457322	2015-10-26	2457422	2016-02-03	-100	SVO
95	9.9	2457468	2016-03-20	2457562	2016-06-22	-94	AAVSO
96	9.9	2457611	2016-08-10	2457703	2016-11-10	-92	SVO
97	9.7	2457748	2016-12-25	2457843	2017-03-30	-95	SVO
98	9.7	2457888	2017-05-14	2457984	2017-08-18	-96	SVO
99	10.0	2458033	2017-10-06	2458124	2018-01-05	-91	SVO
100	9.7	2458166	2018-02-16	2458265	2018-05-26	-99	SVO
101	9.6	2458307	2018-07-07	2458406	2018-10-14	-99	SVO
102	9.5	2458446	2018-11-23	2458546	2019-03-03	-100	SVO
103	9.5	2458585	2019-04-11	2458687	2019-07-22	-102	SVO
104	10.0	2458730	2019-09-03	2458827	2019-12-09	-97	SVO
105	9.5	2458871	2020-01-22	2458968	2020-04-28	-97	SVO
106	9.2	2459006	2020-06-05	2459108	2020-09-15	-102	SVO
107	9.7	2459147	2020-10-24	2459249	2021-02-03	-102	SVO
108	9.4	2459288	2021-03-14	2459390	2021-06-24	-102	SVO
109	9.3	2459424	2021-07-28	2459530	2021-11-11	-106	SVO
110	9.5	2459566	2021-12-17	2459671	2022-04-01	-105	SVO
111		2459715	2022-05-15	2459811	2022-08-19	-96	SVO
112	9.8	2459857	2022-10-04	2459952	2023-01-07	-95	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.