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Double Star Calculator - Orbital Elements
- Revision:
$Rev: 1216 $
- Report created:
2025-07-11 18:30:09
WDS:
COP2AB
WDS ID/Discoverer
P:
736.690
Orbital period (years)
a:
1.409
Semi-major axis (arcseconds)
i:
117.6
Inclination (degrees)
Ω:
125.1
Longitude of ascending node (degrees)
T:
2009.830
Epoch of periastron passage (year)
e:
0.808
Eccentricity
ω:
19.6
Longitude of periastron (degrees)
Start-Year:
1657.0
Year
End-Year:
2393.0
Year
Epoch:
2025.0
Besselian Epoch
Position:
152240.89-444122.5
Epoch-2000 right ascension and declination
WDS-ID:
15227-4441
WDS designation
Discoverer Code:
COP2AB
Discover designation and components
ADS number:
.
Aitken Double Star catalog
HD number:
136504
HD catalog number
Hipparcos number:
75264
Hipparcos catalog number
V1:
3.56
Magnitude of the primary
V2:
5.04
Magnitude of the secondary
Equinox:
2000
Equinox
Date:
2014
Date of last observation
Orbit grade:
4
Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:
n
Flags
Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements)
Click to expand/collapse ephemeris:
Year Sep[“] PA[°]
---------------------------------------------
2025.0 0.220 10.5
-------------------------
1657.0 2.413 295.0
1658.0 2.412 295.0
1659.0 2.410 294.9
1660.0 2.409 294.9
1661.0 2.407 294.9
1662.0 2.405 294.8
1663.0 2.404 294.8
1664.0 2.402 294.7
1665.0 2.401 294.7
1666.0 2.399 294.6
1667.0 2.397 294.6
1668.0 2.395 294.5
1669.0 2.394 294.5
1670.0 2.392 294.4
1671.0 2.390 294.4
1672.0 2.388 294.3
1673.0 2.386 294.3
1674.0 2.384 294.3
1675.0 2.382 294.2
1676.0 2.380 294.2
1677.0 2.378 294.1
1678.0 2.376 294.1
1679.0 2.374 294.0
1680.0 2.372 294.0
1681.0 2.370 293.9
1682.0 2.368 293.9
1683.0 2.366 293.8
1684.0 2.363 293.8
1685.0 2.361 293.7
1686.0 2.359 293.7
1687.0 2.357 293.6
1688.0 2.354 293.6
1689.0 2.352 293.5
1690.0 2.350 293.5
1691.0 2.347 293.4
1692.0 2.345 293.4
1693.0 2.342 293.4
1694.0 2.340 293.3
1695.0 2.337 293.3
1696.0 2.335 293.2
1697.0 2.332 293.2
1698.0 2.330 293.1
1699.0 2.327 293.1
1700.0 2.324 293.0
1701.0 2.322 293.0
1702.0 2.319 292.9
1703.0 2.316 292.9
1704.0 2.313 292.8
1705.0 2.311 292.8
1706.0 2.308 292.7
1707.0 2.305 292.7
1708.0 2.302 292.6
1709.0 2.299 292.6
1710.0 2.296 292.5
1711.0 2.293 292.5
1712.0 2.290 292.4
1713.0 2.287 292.4
1714.0 2.284 292.3
1715.0 2.281 292.3
1716.0 2.278 292.2
1717.0 2.275 292.2
1718.0 2.272 292.1
1719.0 2.268 292.1
1720.0 2.265 292.0
1721.0 2.262 292.0
1722.0 2.259 291.9
1723.0 2.255 291.8
1724.0 2.252 291.8
1725.0 2.248 291.7
1726.0 2.245 291.7
1727.0 2.242 291.6
1728.0 2.238 291.6
1729.0 2.235 291.5
1730.0 2.231 291.5
1731.0 2.228 291.4
1732.0 2.224 291.4
1733.0 2.220 291.3
1734.0 2.217 291.3
1735.0 2.213 291.2
1736.0 2.209 291.2
1737.0 2.206 291.1
1738.0 2.202 291.0
1739.0 2.198 291.0
1740.0 2.194 290.9
1741.0 2.191 290.9
1742.0 2.187 290.8
1743.0 2.183 290.8
1744.0 2.179 290.7
1745.0 2.175 290.7
1746.0 2.171 290.6
1747.0 2.167 290.5
1748.0 2.163 290.5
1749.0 2.159 290.4
1750.0 2.155 290.4
1751.0 2.150 290.3
1752.0 2.146 290.3
1753.0 2.142 290.2
1754.0 2.138 290.1
1755.0 2.134 290.1
1756.0 2.129 290.0
1757.0 2.125 290.0
1758.0 2.121 289.9
1759.0 2.116 289.9
1760.0 2.112 289.8
1761.0 2.107 289.7
1762.0 2.103 289.7
1763.0 2.098 289.6
1764.0 2.094 289.6
1765.0 2.089 289.5
1766.0 2.085 289.4
1767.0 2.080 289.4
1768.0 2.076 289.3
1769.0 2.071 289.3
1770.0 2.066 289.2
1771.0 2.061 289.1
1772.0 2.057 289.1
1773.0 2.052 289.0
1774.0 2.047 288.9
1775.0 2.042 288.9
1776.0 2.037 288.8
1777.0 2.032 288.7
1778.0 2.027 288.7
1779.0 2.022 288.6
1780.0 2.017 288.6
1781.0 2.012 288.5
1782.0 2.007 288.4
1783.0 2.002 288.4
1784.0 1.997 288.3
1785.0 1.992 288.2
1786.0 1.987 288.2
1787.0 1.981 288.1
1788.0 1.976 288.0
1789.0 1.971 288.0
1790.0 1.965 287.9
1791.0 1.960 287.8
1792.0 1.955 287.8
1793.0 1.949 287.7
1794.0 1.944 287.6
1795.0 1.938 287.5
1796.0 1.933 287.5
1797.0 1.927 287.4
1798.0 1.922 287.3
1799.0 1.916 287.3
1800.0 1.910 287.2
1801.0 1.905 287.1
1802.0 1.899 287.0
1803.0 1.893 287.0
1804.0 1.887 286.9
1805.0 1.881 286.8
1806.0 1.876 286.7
1807.0 1.870 286.7
1808.0 1.864 286.6
1809.0 1.858 286.5
1810.0 1.852 286.4
1811.0 1.846 286.4
1812.0 1.840 286.3
1813.0 1.834 286.2
1814.0 1.828 286.1
1815.0 1.821 286.0
1816.0 1.815 286.0
1817.0 1.809 285.9
1818.0 1.803 285.8
1819.0 1.796 285.7
1820.0 1.790 285.6
1821.0 1.784 285.6
1822.0 1.777 285.5
1823.0 1.771 285.4
1824.0 1.764 285.3
1825.0 1.758 285.2
1826.0 1.751 285.1
1827.0 1.745 285.0
1828.0 1.738 285.0
1829.0 1.732 284.9
1830.0 1.725 284.8
1831.0 1.718 284.7
1832.0 1.711 284.6
1833.0 1.705 284.5
1834.0 1.698 284.4
1835.0 1.691 284.3
1836.0 1.684 284.2
1837.0 1.677 284.1
1838.0 1.670 284.0
1839.0 1.663 283.9
1840.0 1.656 283.9
1841.0 1.649 283.8
1842.0 1.642 283.7
1843.0 1.635 283.6
1844.0 1.628 283.5
1845.0 1.621 283.4
1846.0 1.613 283.3
1847.0 1.606 283.2
1848.0 1.599 283.1
1849.0 1.591 282.9
1850.0 1.584 282.8
1851.0 1.576 282.7
1852.0 1.569 282.6
1853.0 1.561 282.5
1854.0 1.554 282.4
1855.0 1.546 282.3
1856.0 1.539 282.2
1857.0 1.531 282.1
1858.0 1.523 282.0
1859.0 1.516 281.9
1860.0 1.508 281.7
1861.0 1.500 281.6
1862.0 1.492 281.5
1863.0 1.484 281.4
1864.0 1.476 281.3
1865.0 1.468 281.1
1866.0 1.460 281.0
1867.0 1.452 280.9
1868.0 1.444 280.8
1869.0 1.436 280.6
1870.0 1.428 280.5
1871.0 1.419 280.4
1872.0 1.411 280.2
1873.0 1.403 280.1
1874.0 1.395 280.0
1875.0 1.386 279.8
1876.0 1.378 279.7
1877.0 1.369 279.6
1878.0 1.361 279.4
1879.0 1.352 279.3
1880.0 1.344 279.1
1881.0 1.335 279.0
1882.0 1.326 278.8
1883.0 1.318 278.7
1884.0 1.309 278.5
1885.0 1.300 278.4
1886.0 1.291 278.2
1887.0 1.282 278.0
1888.0 1.273 277.9
1889.0 1.264 277.7
1890.0 1.255 277.6
1891.0 1.246 277.4
1892.0 1.237 277.2
1893.0 1.228 277.0
1894.0 1.219 276.9
1895.0 1.210 276.7
1896.0 1.200 276.5
1897.0 1.191 276.3
1898.0 1.182 276.1
1899.0 1.172 275.9
1900.0 1.163 275.7
1901.0 1.153 275.5
1902.0 1.144 275.3
1903.0 1.134 275.1
1904.0 1.124 274.9
1905.0 1.115 274.7
1906.0 1.105 274.5
1907.0 1.095 274.3
1908.0 1.085 274.1
1909.0 1.076 273.8
1910.0 1.066 273.6
1911.0 1.056 273.4
1912.0 1.046 273.1
1913.0 1.036 272.9
1914.0 1.025 272.6
1915.0 1.015 272.4
1916.0 1.005 272.1
1917.0 0.995 271.9
1918.0 0.985 271.6
1919.0 0.974 271.3
1920.0 0.964 271.0
1921.0 0.954 270.7
1922.0 0.943 270.4
1923.0 0.933 270.1
1924.0 0.922 269.8
1925.0 0.911 269.5
1926.0 0.901 269.2
1927.0 0.890 268.9
1928.0 0.879 268.5
1929.0 0.869 268.2
1930.0 0.858 267.8
1931.0 0.847 267.5
1932.0 0.836 267.1
1933.0 0.825 266.7
1934.0 0.814 266.3
1935.0 0.803 265.9
1936.0 0.792 265.5
1937.0 0.781 265.1
1938.0 0.770 264.6
1939.0 0.758 264.2
1940.0 0.747 263.7
1941.0 0.736 263.2
1942.0 0.725 262.7
1943.0 0.713 262.2
1944.0 0.702 261.7
1945.0 0.691 261.1
1946.0 0.679 260.6
1947.0 0.668 260.0
1948.0 0.656 259.4
1949.0 0.645 258.8
1950.0 0.633 258.1
1951.0 0.622 257.4
1952.0 0.610 256.7
1953.0 0.599 256.0
1954.0 0.587 255.3
1955.0 0.575 254.5
1956.0 0.564 253.7
1957.0 0.552 252.8
1958.0 0.541 251.9
1959.0 0.529 251.0
1960.0 0.518 250.0
1961.0 0.506 249.0
1962.0 0.495 248.0
1963.0 0.484 246.9
1964.0 0.472 245.7
1965.0 0.461 244.5
1966.0 0.450 243.2
1967.0 0.439 241.9
1968.0 0.428 240.5
1969.0 0.417 239.0
1970.0 0.407 237.4
1971.0 0.396 235.8
1972.0 0.386 234.0
1973.0 0.376 232.2
1974.0 0.366 230.3
1975.0 0.357 228.3
1976.0 0.348 226.1
1977.0 0.339 223.9
1978.0 0.330 221.5
1979.0 0.322 219.0
1980.0 0.314 216.4
1981.0 0.307 213.7
1982.0 0.301 210.8
1983.0 0.294 207.8
1984.0 0.289 204.7
1985.0 0.284 201.5
1986.0 0.280 198.1
1987.0 0.276 194.7
1988.0 0.274 191.2
1989.0 0.271 187.6
1990.0 0.270 184.0
1991.0 0.269 180.4
1992.0 0.269 176.7
1993.0 0.270 173.1
1994.0 0.271 169.5
1995.0 0.273 165.9
1996.0 0.275 162.3
1997.0 0.277 158.9
1998.0 0.279 155.4
1999.0 0.282 152.1
2000.0 0.284 148.7
2001.0 0.286 145.5
2002.0 0.287 142.3
2003.0 0.288 139.1
2004.0 0.288 135.9
2005.0 0.286 132.6
2006.0 0.283 129.4
2007.0 0.279 126.0
2008.0 0.273 122.6
2009.0 0.266 118.9
2010.0 0.257 115.1
2011.0 0.246 110.9
2012.0 0.235 106.3
2013.0 0.223 101.2
2014.0 0.210 95.6
2015.0 0.199 89.2
2016.0 0.188 82.1
2017.0 0.180 74.3
2018.0 0.174 65.8
2019.0 0.171 56.8
2020.0 0.171 47.7
2021.0 0.175 38.9
2022.0 0.183 30.6
2023.0 0.193 23.1
2024.0 0.206 16.4
2025.0 0.220 10.5
2026.0 0.236 5.4
2027.0 0.253 1.0
2028.0 0.271 357.1
2029.0 0.290 353.8
2030.0 0.309 350.8
2031.0 0.328 348.2
2032.0 0.348 345.9
2033.0 0.367 343.8
2034.0 0.387 342.0
2035.0 0.407 340.3
2036.0 0.426 338.7
2037.0 0.446 337.3
2038.0 0.465 336.1
2039.0 0.484 334.9
2040.0 0.503 333.8
2041.0 0.522 332.8
2042.0 0.541 331.9
2043.0 0.560 331.0
2044.0 0.578 330.2
2045.0 0.597 329.4
2046.0 0.615 328.7
2047.0 0.633 328.0
2048.0 0.650 327.4
2049.0 0.668 326.7
2050.0 0.685 326.2
2051.0 0.703 325.6
2052.0 0.720 325.1
2053.0 0.736 324.6
2054.0 0.753 324.1
2055.0 0.770 323.7
2056.0 0.786 323.2
2057.0 0.802 322.8
2058.0 0.818 322.4
2059.0 0.834 322.0
2060.0 0.850 321.6
2061.0 0.865 321.3
2062.0 0.881 320.9
2063.0 0.896 320.6
2064.0 0.911 320.3
2065.0 0.926 320.0
2066.0 0.941 319.7
2067.0 0.956 319.4
2068.0 0.970 319.1
2069.0 0.984 318.8
2070.0 0.999 318.5
2071.0 1.013 318.3
2072.0 1.027 318.0
2073.0 1.041 317.8
2074.0 1.054 317.5
2075.0 1.068 317.3
2076.0 1.082 317.1
2077.0 1.095 316.8
2078.0 1.108 316.6
2079.0 1.121 316.4
2080.0 1.134 316.2
2081.0 1.147 316.0
2082.0 1.160 315.8
2083.0 1.173 315.6
2084.0 1.185 315.4
2085.0 1.197 315.2
2086.0 1.210 315.0
2087.0 1.222 314.9
2088.0 1.234 314.7
2089.0 1.246 314.5
2090.0 1.258 314.3
2091.0 1.270 314.2
2092.0 1.282 314.0
2093.0 1.293 313.9
2094.0 1.305 313.7
2095.0 1.316 313.5
2096.0 1.327 313.4
2097.0 1.339 313.2
2098.0 1.350 313.1
2099.0 1.361 313.0
2100.0 1.372 312.8
2101.0 1.383 312.7
2102.0 1.393 312.5
2103.0 1.404 312.4
2104.0 1.415 312.3
2105.0 1.425 312.1
2106.0 1.435 312.0
2107.0 1.446 311.9
2108.0 1.456 311.7
2109.0 1.466 311.6
2110.0 1.476 311.5
2111.0 1.486 311.4
2112.0 1.496 311.3
2113.0 1.506 311.1
2114.0 1.516 311.0
2115.0 1.526 310.9
2116.0 1.535 310.8
2117.0 1.545 310.7
2118.0 1.554 310.6
2119.0 1.564 310.5
2120.0 1.573 310.4
2121.0 1.582 310.3
2122.0 1.591 310.2
2123.0 1.600 310.0
2124.0 1.609 309.9
2125.0 1.618 309.8
2126.0 1.627 309.7
2127.0 1.636 309.6
2128.0 1.645 309.5
2129.0 1.653 309.4
2130.0 1.662 309.4
2131.0 1.671 309.3
2132.0 1.679 309.2
2133.0 1.687 309.1
2134.0 1.696 309.0
2135.0 1.704 308.9
2136.0 1.712 308.8
2137.0 1.720 308.7
2138.0 1.729 308.6
2139.0 1.737 308.5
2140.0 1.745 308.4
2141.0 1.752 308.4
2142.0 1.760 308.3
2143.0 1.768 308.2
2144.0 1.776 308.1
2145.0 1.783 308.0
2146.0 1.791 307.9
2147.0 1.799 307.8
2148.0 1.806 307.8
2149.0 1.814 307.7
2150.0 1.821 307.6
2151.0 1.828 307.5
2152.0 1.835 307.4
2153.0 1.843 307.4
2154.0 1.850 307.3
2155.0 1.857 307.2
2156.0 1.864 307.1
2157.0 1.871 307.1
2158.0 1.878 307.0
2159.0 1.885 306.9
2160.0 1.892 306.8
2161.0 1.898 306.8
2162.0 1.905 306.7
2163.0 1.912 306.6
2164.0 1.918 306.5
2165.0 1.925 306.5
2166.0 1.931 306.4
2167.0 1.938 306.3
2168.0 1.944 306.3
2169.0 1.951 306.2
2170.0 1.957 306.1
2171.0 1.963 306.1
2172.0 1.969 306.0
2173.0 1.975 305.9
2174.0 1.982 305.8
2175.0 1.988 305.8
2176.0 1.994 305.7
2177.0 2.000 305.6
2178.0 2.005 305.6
2179.0 2.011 305.5
2180.0 2.017 305.5
2181.0 2.023 305.4
2182.0 2.029 305.3
2183.0 2.034 305.3
2184.0 2.040 305.2
2185.0 2.045 305.1
2186.0 2.051 305.1
2187.0 2.056 305.0
2188.0 2.062 304.9
2189.0 2.067 304.9
2190.0 2.073 304.8
2191.0 2.078 304.8
2192.0 2.083 304.7
2193.0 2.088 304.6
2194.0 2.094 304.6
2195.0 2.099 304.5
2196.0 2.104 304.5
2197.0 2.109 304.4
2198.0 2.114 304.3
2199.0 2.119 304.3
2200.0 2.124 304.2
2201.0 2.128 304.2
2202.0 2.133 304.1
2203.0 2.138 304.0
2204.0 2.143 304.0
2205.0 2.147 303.9
2206.0 2.152 303.9
2207.0 2.157 303.8
2208.0 2.161 303.8
2209.0 2.166 303.7
2210.0 2.170 303.6
2211.0 2.175 303.6
2212.0 2.179 303.5
2213.0 2.184 303.5
2214.0 2.188 303.4
2215.0 2.192 303.4
2216.0 2.196 303.3
2217.0 2.201 303.3
2218.0 2.205 303.2
2219.0 2.209 303.1
2220.0 2.213 303.1
2221.0 2.217 303.0
2222.0 2.221 303.0
2223.0 2.225 302.9
2224.0 2.229 302.9
2225.0 2.233 302.8
2226.0 2.237 302.8
2227.0 2.240 302.7
2228.0 2.244 302.7
2229.0 2.248 302.6
2230.0 2.252 302.6
2231.0 2.255 302.5
2232.0 2.259 302.5
2233.0 2.263 302.4
2234.0 2.266 302.4
2235.0 2.270 302.3
2236.0 2.273 302.2
2237.0 2.277 302.2
2238.0 2.280 302.1
2239.0 2.283 302.1
2240.0 2.287 302.0
2241.0 2.290 302.0
2242.0 2.293 301.9
2243.0 2.296 301.9
2244.0 2.300 301.8
2245.0 2.303 301.8
2246.0 2.306 301.7
2247.0 2.309 301.7
2248.0 2.312 301.6
2249.0 2.315 301.6
2250.0 2.318 301.5
2251.0 2.321 301.5
2252.0 2.324 301.4
2253.0 2.327 301.4
2254.0 2.329 301.3
2255.0 2.332 301.3
2256.0 2.335 301.3
2257.0 2.338 301.2
2258.0 2.340 301.2
2259.0 2.343 301.1
2260.0 2.346 301.1
2261.0 2.348 301.0
2262.0 2.351 301.0
2263.0 2.353 300.9
2264.0 2.356 300.9
2265.0 2.358 300.8
2266.0 2.361 300.8
2267.0 2.363 300.7
2268.0 2.365 300.7
2269.0 2.368 300.6
2270.0 2.370 300.6
2271.0 2.372 300.5
2272.0 2.374 300.5
2273.0 2.376 300.4
2274.0 2.379 300.4
2275.0 2.381 300.3
2276.0 2.383 300.3
2277.0 2.385 300.3
2278.0 2.387 300.2
2279.0 2.389 300.2
2280.0 2.391 300.1
2281.0 2.393 300.1
2282.0 2.395 300.0
2283.0 2.396 300.0
2284.0 2.398 299.9
2285.0 2.400 299.9
2286.0 2.402 299.8
2287.0 2.404 299.8
2288.0 2.405 299.7
2289.0 2.407 299.7
2290.0 2.408 299.7
2291.0 2.410 299.6
2292.0 2.412 299.6
2293.0 2.413 299.5
2294.0 2.415 299.5
2295.0 2.416 299.4
2296.0 2.418 299.4
2297.0 2.419 299.3
2298.0 2.420 299.3
2299.0 2.422 299.2
2300.0 2.423 299.2
2301.0 2.424 299.2
2302.0 2.426 299.1
2303.0 2.427 299.1
2304.0 2.428 299.0
2305.0 2.429 299.0
2306.0 2.430 298.9
2307.0 2.431 298.9
2308.0 2.432 298.8
2309.0 2.433 298.8
2310.0 2.434 298.8
2311.0 2.435 298.7
2312.0 2.436 298.7
2313.0 2.437 298.6
2314.0 2.438 298.6
2315.0 2.439 298.5
2316.0 2.440 298.5
2317.0 2.440 298.4
2318.0 2.441 298.4
2319.0 2.442 298.4
2320.0 2.443 298.3
2321.0 2.443 298.3
2322.0 2.444 298.2
2323.0 2.445 298.2
2324.0 2.445 298.1
2325.0 2.446 298.1
2326.0 2.446 298.0
2327.0 2.447 298.0
2328.0 2.447 298.0
2329.0 2.448 297.9
2330.0 2.448 297.9
2331.0 2.448 297.8
2332.0 2.449 297.8
2333.0 2.449 297.7
2334.0 2.449 297.7
2335.0 2.449 297.6
2336.0 2.450 297.6
2337.0 2.450 297.6
2338.0 2.450 297.5
2339.0 2.450 297.5
2340.0 2.450 297.4
2341.0 2.450 297.4
2342.0 2.450 297.3
2343.0 2.450 297.3
2344.0 2.450 297.2
2345.0 2.450 297.2
2346.0 2.450 297.2
2347.0 2.450 297.1
2348.0 2.450 297.1
2349.0 2.450 297.0
2350.0 2.450 297.0
2351.0 2.449 296.9
2352.0 2.449 296.9
2353.0 2.449 296.9
2354.0 2.449 296.8
2355.0 2.448 296.8
2356.0 2.448 296.7
2357.0 2.447 296.7
2358.0 2.447 296.6
2359.0 2.447 296.6
2360.0 2.446 296.5
2361.0 2.446 296.5
2362.0 2.445 296.5
2363.0 2.444 296.4
2364.0 2.444 296.4
2365.0 2.443 296.3
2366.0 2.443 296.3
2367.0 2.442 296.2
2368.0 2.441 296.2
2369.0 2.440 296.1
2370.0 2.440 296.1
2371.0 2.439 296.1
2372.0 2.438 296.0
2373.0 2.437 296.0
2374.0 2.436 295.9
2375.0 2.435 295.9
2376.0 2.434 295.8
2377.0 2.433 295.8
2378.0 2.432 295.7
2379.0 2.431 295.7
2380.0 2.430 295.7
2381.0 2.429 295.6
2382.0 2.428 295.6
2383.0 2.427 295.5
2384.0 2.426 295.5
2385.0 2.425 295.4
2386.0 2.423 295.4
2387.0 2.422 295.3
2388.0 2.421 295.3
2389.0 2.420 295.2
2390.0 2.418 295.2
2391.0 2.417 295.2
2392.0 2.416 295.1
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Copyright (C) 2025. The Double Star Calculator and the results generated are licensed under CC BY-NC-SA 4.0 .
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 .
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