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Observation Summary for Variable Star U BOO

Total observations:	10,481		Minimum magnitude:	14.400	Maximum magnitude:	8.550
First observation:	JD 2407787.500000	\	13 Mar 1880 00:00:00.000000 UT	Latest observation:	JD 2460941.329000	\	22 Sep 2025 19:53:45.600000 UT

Observation Method	Number of Observations
Visual	10,353
CCD	32
CMOS	96

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Summary by Year and Month

Year	Total	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
2025	152	3	2	6	116	6	5	6	5	3	0	0	0
2024	50	5	2	4	3	7	4	5	8	3	4	1	4
2023	55	3	4	3	7	8	8	6	4	3	3	3	3
2022	57	4	4	5	8	6	5	5	6	4	4	3	3
2021	64	4	3	6	12	10	7	7	4	5	3	1	2
2020	60	4	4	4	9	14	5	7	3	4	1	2	3
2019	59	3	4	6	8	6	7	5	7	5	3	1	4
2018	69	4	5	3	6	10	6	6	15	6	3	2	3
2017	62	4	3	7	14	10	4	4	8	3	0	2	3
2016	72	2	5	6	12	14	3	6	9	6	2	3	4
2015	89	4	5	3	19	13	7	10	11	10	2	1	4
2014	81	3	4	7	11	20	8	8	9	6	2	0	3
2013	89	4	3	4	12	16	10	13	12	6	2	1	6
2012	70	5	3	7	6	13	2	5	13	7	3	2	4
2011	59	4	4	5	9	9	6	5	4	6	2	1	4
2010	77	6	3	5	17	12	6	4	9	4	5	4	2
2009	94	7	6	11	13	15	8	8	9	5	3	4	5
2008	77	4	6	5	9	13	10	9	3	7	4	2	5
2007	72	5	2	4	10	11	7	9	9	6	4	0	5
2006	46	2	2	3	9	8	4	5	4	3	1	3	2
2005	54	3	2	3	6	10	10	2	6	5	2	1	4
2004	70	4	4	7	8	10	8	2	9	8	8	0	2
2003	89	4	3	11	14	12	10	9	13	7	3	1	2
2002	97	2	5	4	17	14	6	15	12	13	7	0	2
2001	106	5	2	8	13	19	11	13	19	7	4	1	4
2000	120	2	7	13	17	12	11	19	19	13	5	1	1
1999	127	4	4	12	17	13	10	25	18	12	9	0	3
1998	100	7	3	9	8	12	8	12	22	9	3	3	4
1997	83	3	7	11	5	12	3	9	9	9	8	3	4
1996	70	1	3	2	12	12	9	10	8	6	1	3	3
1995	84	6	4	11	8	15	8	10	10	8	0	2	2
1994	87	3	6	11	13	10	14	9	10	4	2	0	5
1993	92	2	4	13	6	16	12	13	13	3	3	2	5
1992	80	3	5	5	9	16	9	11	11	5	3	0	3
1991	90	3	4	7	13	15	14	7	11	7	6	0	3
1990	122	4	6	16	23	20	13	20	9	6	0	1	4
1989	168	4	6	18	19	32	26	21	25	13	4	0	0
1988	200	12	11	12	24	34	23	34	28	15	4	0	3
1987	201	8	6	15	30	29	24	23	33	19	7	3	4
1986	125	6	6	11	14	15	20	17	9	10	8	2	7
1985	101	3	7	7	14	16	10	14	11	7	7	1	4
1984	103	2	5	9	21	13	15	16	7	6	6	0	3
1983	88	2	2	8	21	14	14	14	7	4	2	0	0
1982	80	0	3	7	15	21	12	11	6	5	0	0	0
1981	101	8	14	7	13	25	8	4	9	9	3	1	0
1980	134	5	3	7	30	25	7	18	14	11	8	2	4
1979	92	4	5	9	7	24	7	5	8	14	2	3	4
1978	75	3	4	6	4	12	4	8	12	12	6	2	2
1977	135	0	1	5	26	25	16	21	15	15	9	1	1
1976	132	3	3	11	29	25	21	16	17	5	2	0	0
1975	166	7	3	16	17	19	30	18	35	17	2	1	1
1974	155	6	11	14	19	26	23	22	22	7	1	3	1
1973	142	1	7	14	11	30	27	17	19	7	2	3	4
1972	9	0	0	0	1	3	0	1	2	1	1	0	0
1971	33	0	0	0	2	5	2	7	6	6	5	0	0
1970	3	0	0	1	1	0	0	0	1	0	0	0	0
1969	22	0	0	0	3	3	5	6	4	1	0	0	0
1968	19	2	1	5	1	1	1	0	3	3	0	0	2
1967	10	0	0	2	1	0	0	1	4	1	1	0	0
1966	12	0	0	0	0	0	1	4	6	1	0	0	0
1965	23	0	0	0	0	3	4	2	9	5	0	0	0
1964	14	0	0	1	2	2	2	3	3	1	0	0	0
1963	41	2	2	5	4	4	4	12	5	2	1	0	0
1962	42	0	1	5	6	5	7	8	6	2	2	0	0
1961	19	0	0	1	2	5	1	1	3	3	3	0	0
1960	18	3	2	3	3	0	0	4	1	1	1	0	0
1959	73	0	2	7	13	6	10	11	9	10	5	0	0
1958	44	1	1	3	11	11	5	3	7	0	2	0	0
1957	30	0	4	4	3	5	3	3	2	3	2	0	1
1956	38	5	0	5	8	8	0	0	6	2	4	0	0
1955	129	3	5	12	14	14	15	17	17	16	12	3	1
1954	49	1	2	3	9	5	3	3	8	9	6	0	0
1953	52	1	2	6	5	10	3	7	9	4	5	0	0
1952	70	3	3	6	10	8	7	11	9	6	4	1	2
1951	110	3	4	7	15	14	9	18	13	16	9	2	0
1950	80	3	11	10	10	6	6	8	14	6	6	0	0
1949	74	2	10	8	8	10	10	7	9	4	6	0	0
1948	88	0	1	9	13	17	11	9	9	12	6	0	1
1947	108	3	1	12	19	16	13	16	15	12	1	0	0
1946	102	0	4	8	18	17	13	16	14	10	2	0	0
1945	105	1	0	4	17	18	12	17	19	9	8	0	0
1944	52	0	2	7	10	9	3	0	7	9	2	0	3
1943	72	1	1	2	5	12	10	12	19	10	0	0	0
1942	27	0	0	1	3	6	1	4	6	6	0	0	0
1941	18	2	4	3	2	1	0	0	2	4	0	0	0
1940	128	7	5	16	18	21	15	12	12	11	4	2	5
1939	154	9	17	15	20	20	11	18	16	10	9	5	4
1938	170	7	13	28	32	15	14	13	12	12	5	7	12
1937	117	4	7	10	12	19	18	11	5	14	3	5	9
1936	108	4	5	12	15	20	15	6	15	7	2	1	6
1935	113	6	7	6	8	16	21	18	4	11	7	3	6
1934	154	9	4	15	12	28	13	23	15	14	7	7	7
1933	212	11	9	29	35	20	12	28	28	17	11	6	6
1932	200	9	17	30	26	20	22	22	21	13	9	6	5
1931	196	9	14	22	21	29	19	16	17	16	13	11	9
1930	177	13	12	20	18	21	20	12	14	17	15	5	10
1929	257	9	6	21	41	38	27	31	22	29	13	9	11
1928	252	19	20	24	36	27	19	31	21	24	15	7	9
1927	250	12	10	27	33	24	27	26	37	20	16	8	10
1926	197	8	9	12	17	11	29	27	24	26	17	8	9
1925	147	13	10	8	18	16	31	17	9	9	2	7	7
1924	137	8	10	17	17	17	14	16	6	7	10	4	11
1923	79	4	3	8	9	9	7	10	9	13	4	3	0
1922	92	9	6	8	8	13	7	10	12	7	6	5	1
1921	112	7	8	12	12	11	15	15	8	8	6	5	5
1920	120	10	7	12	5	13	14	16	14	11	9	4	5
1919	107	5	7	10	9	15	10	12	11	14	6	5	3
1918	46	0	0	0	0	7	3	7	5	8	4	5	7
1914	4	0	0	1	0	0	1	0	0	1	0	1	0
1891	12	0	0	2	4	5	1	0	0	0	0	0	0
1889	13	0	1	3	1	4	1	1	1	1	0	0	0
1888	9	0	0	2	0	3	1	0	1	0	2	0	0
1887	19	0	2	1	5	5	2	3	1	0	0	0	0
1886	11	0	2	2	2	2	2	0	0	1	0	0	0
1885	21	0	0	3	5	3	3	3	1	3	0	0	0
1884	30	0	1	3	1	4	3	8	6	3	1	0	0
1883	8	0	0	4	1	0	0	1	1	0	1	0	0
1882	22	0	0	5	4	4	0	4	2	3	0	0	0
1881	32	0	0	2	5	6	1	7	3	4	4	0	0
1880	66	0	0	8	14	13	2	5	9	8	7	0	0