Double Star Calculator - Orbit

Orbital Elements for COU1904

WDS:	COU1904	WDS ID/Discoverer
P:	228.300	Orbital period (years)
a:	0.559	Semi-major axis (arcseconds)
i:	79.1	Inclination (degrees)
Ω:	20.8	Longitude of ascending node (degrees)
T:	1972.700	Epoch of periastron passage (year)
e:	0.513	Eccentricity
ω:	104.0	Longitude of periastron (degrees)
Start-Year:	1910.85	Year
End-Year:	2139.15	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for COU1904
Position:	111549.68+422658.1	Epoch-2000 right ascension and declination
WDS-ID:	11158+4227	WDS designation
Discoverer Code:	COU1904	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	97857	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	8.33	Magnitude of the primary
V2:	9.46	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	BAE2021	Reference

Double Star Orbit for COU1904

WDS 6th Orbit including measures of COU1904

-- Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements) --

Legend:

Green plus signs:	Visual (micrometric) measures
Violet asterisks:	Photographic measures
Blue symbols:	Various interferometric techniques
Dot-dash line:	Indicates the line of nodes

Ephemeris of COU1904

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.331   220.51
--------------------------
1910.85    0.542    11.36
1911.85    0.545    11.63
1912.85    0.547    11.90
1913.85    0.549    12.16
1914.85    0.551    12.43
1915.85    0.553    12.69
1916.85    0.554    12.95
1917.85    0.555    13.21
1918.85    0.556    13.47
1919.85    0.557    13.73
1920.85    0.557    13.99
1921.85    0.558    14.25
1922.85    0.558    14.50
1923.85    0.557    14.76
1924.85    0.557    15.02
1925.85    0.556    15.28
1926.85    0.555    15.54
1927.85    0.553    15.80
1928.85    0.551    16.06
1929.85    0.549    16.32
1930.85    0.547    16.59
1931.85    0.544    16.86
1932.85    0.541    17.13
1933.85    0.537    17.40
1934.85    0.534    17.68
1935.85    0.529    17.97
1936.85    0.524    18.25
1937.85    0.519    18.55
1938.85    0.514    18.85
1939.85    0.508    19.15
1940.85    0.501    19.47
1941.85    0.494    19.79
1942.85    0.486    20.12
1943.85    0.478    20.47
1944.85    0.470    20.82
1945.85    0.460    21.19
1946.85    0.451    21.58
1947.85    0.440    21.98
1948.85    0.429    22.41
1949.85    0.417    22.85
1950.85    0.405    23.33
1951.85    0.391    23.83
1952.85    0.377    24.37
1953.85    0.363    24.96
1954.85    0.347    25.59
1955.85    0.331    26.29
1956.85    0.314    27.06
1957.85    0.296    27.92
1958.85    0.277    28.89
1959.85    0.257    30.02
1960.85    0.237    31.32
1961.85    0.216    32.89
1962.85    0.194    34.79
1963.85    0.172    37.19
1964.85    0.149    40.31
1965.85    0.126    44.57
1966.85    0.103    50.71
1967.85    0.082    60.15
1968.85    0.064    75.52
1969.85    0.053    99.72
1970.85    0.054   128.64
1971.85    0.067   151.23
1972.85    0.086   165.32
1973.85    0.107   174.04
1974.85    0.130   179.78
1975.85    0.152   183.83
1976.85    0.175   186.83
1977.85    0.196   189.17
1978.85    0.217   191.05
1979.85    0.236   192.61
1980.85    0.255   193.93
1981.85    0.272   195.08
1982.85    0.289   196.10
1983.85    0.304   197.01
1984.85    0.318   197.84
1985.85    0.331   198.60
1986.85    0.343   199.30
1987.85    0.353   199.96
1988.85    0.363   200.58
1989.85    0.372   201.18
1990.85    0.380   201.74
1991.85    0.387   202.29
1992.85    0.393   202.81
1993.85    0.398   203.32
1994.85    0.403   203.82
1995.85    0.407   204.31
1996.85    0.410   204.79
1997.85    0.413   205.26
1998.85    0.415   205.73
1999.85    0.416   206.19
2000.85    0.417   206.65
2001.85    0.418   207.11
2002.85    0.418   207.56
2003.85    0.418   208.02
2004.85    0.417   208.48
2005.85    0.415   208.94
2006.85    0.414   209.41
2007.85    0.412   209.88
2008.85    0.410   210.35
2009.85    0.407   210.83
2010.85    0.404   211.32
2011.85    0.401   211.81
2012.85    0.397   212.31
2013.85    0.394   212.83
2014.85    0.390   213.35
2015.85    0.386   213.88
2016.85    0.381   214.42
2017.85    0.377   214.98
2018.85    0.372   215.55
2019.85    0.367   216.14
2020.85    0.362   216.74
2021.85    0.357   217.36
2022.85    0.351   218.00
2023.85    0.346   218.66
2024.85    0.340   219.34
2025.85    0.334   220.04
2026.85    0.329   220.77
2027.85    0.323   221.52
2028.85    0.317   222.30
2029.85    0.311   223.12
2030.85    0.304   223.96
2031.85    0.298   224.84
2032.85    0.292   225.76
2033.85    0.286   226.72
2034.85    0.279   227.72
2035.85    0.273   228.77
2036.85    0.267   229.87
2037.85    0.261   231.02
2038.85    0.254   232.22
2039.85    0.248   233.49
2040.85    0.242   234.82
2041.85    0.236   236.23
2042.85    0.230   237.70
2043.85    0.224   239.26
2044.85    0.218   240.90
2045.85    0.212   242.63
2046.85    0.207   244.46
2047.85    0.201   246.39
2048.85    0.196   248.42
2049.85    0.191   250.56
2050.85    0.186   252.81
2051.85    0.181   255.18
2052.85    0.177   257.68
2053.85    0.173   260.28
2054.85    0.169   263.01
2055.85    0.166   265.85
2056.85    0.163   268.80
2057.85    0.161   271.85
2058.85    0.159   274.99
2059.85    0.157   278.21
2060.85    0.156   281.48
2061.85    0.155   284.79
2062.85    0.155   288.12
2063.85    0.155   291.45
2064.85    0.156   294.76
2065.85    0.157   298.02
2066.85    0.159   301.23
2067.85    0.161   304.36
2068.85    0.164   307.39
2069.85    0.167   310.33
2070.85    0.170   313.16
2071.85    0.174   315.87
2072.85    0.178   318.46
2073.85    0.182   320.93
2074.85    0.187   323.29
2075.85    0.192   325.52
2076.85    0.197   327.65
2077.85    0.202   329.66
2078.85    0.208   331.56
2079.85    0.213   333.37
2080.85    0.219   335.08
2081.85    0.225   336.70
2082.85    0.231   338.23
2083.85    0.238   339.69
2084.85    0.244   341.07
2085.85    0.250   342.38
2086.85    0.257   343.62
2087.85    0.263   344.81
2088.85    0.270   345.93
2089.85    0.277   347.00
2090.85    0.283   348.02
2091.85    0.290   349.00
2092.85    0.297   349.93
2093.85    0.303   350.82
2094.85    0.310   351.67
2095.85    0.317   352.48
2096.85    0.323   353.26
2097.85    0.330   354.01
2098.85    0.337   354.73
2099.85    0.343   355.42
2100.85    0.350   356.09
2101.85    0.357   356.73
2102.85    0.363   357.35
2103.85    0.370   357.94
2104.85    0.376   358.52
2105.85    0.382   359.08
2106.85    0.389   359.61
2107.85    0.395     0.14
2108.85    0.401     0.64
2109.85    0.407     1.13
2110.85    0.414     1.60
2111.85    0.420     2.06
2112.85    0.425     2.51
2113.85    0.431     2.95
2114.85    0.437     3.37
2115.85    0.443     3.79
2116.85    0.448     4.19
2117.85    0.454     4.58
2118.85    0.459     4.96
2119.85    0.465     5.34
2120.85    0.470     5.71
2121.85    0.475     6.06
2122.85    0.480     6.41
2123.85    0.485     6.76
2124.85    0.490     7.10
2125.85    0.494     7.43
2126.85    0.499     7.75
2127.85    0.503     8.07
2128.85    0.507     8.38
2129.85    0.512     8.69
2130.85    0.515     8.99
2131.85    0.519     9.29
2132.85    0.523     9.59
2133.85    0.527     9.88
2134.85    0.530    10.16
2135.85    0.533    10.45
2136.85    0.536    10.73
2137.85    0.539    11.00
2138.85    0.542    11.28

Disclaimer

This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. Unless otherwise noted, all output generated by the Double Star Calculator including orbit diagrams, ephemerides, and analytical reports is licensed under CC BY 4.0.

Acknowledgements

The Double Star Calculator - Orbital Elements makes use of the Washington Double Star Sixth Catalog of Orbits of Visual Binary Stars, maintained at the U.S. Naval Observatory.

Report Information

Double Star Calculator:		Version 1.2 ($Rev: 2397 $)
Report created:		2026-06-25 16:36:10