Content-Type: text/html; charset=UTF-8 Double Star Calculator - Orbital Elements

Double Star Calculator - Orbit

- Revision: $Rev: 1216 $
- Report created: 2025-07-11 17:54:21

Orbital Elements for I205AB
WDS: I205AB WDS ID/Discoverer
P: 724.310 Orbital period (years)
a: 4.19498 Semi-major axis (arcseconds)
i: 117.279 Inclination (degrees)
Ω: 83.498 Longitude of ascending node (degrees)
T: 2049.579 Epoch of periastron passage (year)
e: 0.64185 Eccentricity
ω: 219.35 Longitude of periastron (degrees)
Start-Year: 1663.0 Year
End-Year: 2387.0 Year
Epoch: 2025.0 Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for I205AB
Position: 094842.84-262452.0 Epoch-2000 right ascension and declination
WDS-ID: 09487-2625 WDS designation
Discoverer Code: I205AB Discover designation and components
ADS number: 7524 Aitken Double Star catalog
HD number: 85043 HD catalog number
Hipparcos number: 48125 Hipparcos catalog number
V1: 6.70 Magnitude of the primary
V2: 10.82 Magnitude of the secondary
Equinox: Equinox
Date: 2015 Date of last observation
Orbit grade: 5 Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags: Flags

Double Star Orbit for I205AB



WDS 6th Orbit including measures of I205AB

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


Ephemeris of I205AB
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.781    274.3
-------------------------
1663.0     5.860     65.2
1664.0     5.854     65.1
1665.0     5.848     65.0
1666.0     5.841     64.9
1667.0     5.835     64.8
1668.0     5.829     64.7
1669.0     5.823     64.6
1670.0     5.816     64.5
1671.0     5.809     64.4
1672.0     5.803     64.3
1673.0     5.796     64.2
1674.0     5.789     64.2
1675.0     5.782     64.1
1676.0     5.775     64.0
1677.0     5.768     63.9
1678.0     5.761     63.8
1679.0     5.754     63.7
1680.0     5.747     63.6
1681.0     5.739     63.5
1682.0     5.732     63.4
1683.0     5.724     63.3
1684.0     5.717     63.2
1685.0     5.709     63.1
1686.0     5.701     63.0
1687.0     5.693     62.9
1688.0     5.685     62.8
1689.0     5.677     62.8
1690.0     5.669     62.7
1691.0     5.661     62.6
1692.0     5.652     62.5
1693.0     5.644     62.4
1694.0     5.636     62.3
1695.0     5.627     62.2
1696.0     5.618     62.1
1697.0     5.610     62.0
1698.0     5.601     61.9
1699.0     5.592     61.8
1700.0     5.583     61.7
1701.0     5.574     61.6
1702.0     5.565     61.5
1703.0     5.556     61.4
1704.0     5.547     61.3
1705.0     5.537     61.2
1706.0     5.528     61.1
1707.0     5.518     61.0
1708.0     5.509     60.9
1709.0     5.499     60.8
1710.0     5.490     60.7
1711.0     5.480     60.6
1712.0     5.470     60.5
1713.0     5.460     60.4
1714.0     5.450     60.3
1715.0     5.440     60.2
1716.0     5.430     60.1
1717.0     5.419     60.0
1718.0     5.409     59.9
1719.0     5.399     59.7
1720.0     5.388     59.6
1721.0     5.378     59.5
1722.0     5.367     59.4
1723.0     5.356     59.3
1724.0     5.346     59.2
1725.0     5.335     59.1
1726.0     5.324     59.0
1727.0     5.313     58.9
1728.0     5.302     58.8
1729.0     5.291     58.7
1730.0     5.279     58.6
1731.0     5.268     58.5
1732.0     5.257     58.3
1733.0     5.245     58.2
1734.0     5.234     58.1
1735.0     5.222     58.0
1736.0     5.211     57.9
1737.0     5.199     57.8
1738.0     5.187     57.7
1739.0     5.175     57.6
1740.0     5.163     57.4
1741.0     5.151     57.3
1742.0     5.139     57.2
1743.0     5.127     57.1
1744.0     5.115     57.0
1745.0     5.103     56.9
1746.0     5.090     56.7
1747.0     5.078     56.6
1748.0     5.065     56.5
1749.0     5.053     56.4
1750.0     5.040     56.3
1751.0     5.027     56.1
1752.0     5.015     56.0
1753.0     5.002     55.9
1754.0     4.989     55.8
1755.0     4.976     55.6
1756.0     4.963     55.5
1757.0     4.950     55.4
1758.0     4.937     55.3
1759.0     4.923     55.1
1760.0     4.910     55.0
1761.0     4.897     54.9
1762.0     4.883     54.8
1763.0     4.870     54.6
1764.0     4.856     54.5
1765.0     4.843     54.4
1766.0     4.829     54.2
1767.0     4.815     54.1
1768.0     4.801     54.0
1769.0     4.787     53.8
1770.0     4.773     53.7
1771.0     4.759     53.6
1772.0     4.745     53.4
1773.0     4.731     53.3
1774.0     4.717     53.2
1775.0     4.703     53.0
1776.0     4.688     52.9
1777.0     4.674     52.7
1778.0     4.659     52.6
1779.0     4.645     52.5
1780.0     4.630     52.3
1781.0     4.615     52.2
1782.0     4.601     52.0
1783.0     4.586     51.9
1784.0     4.571     51.7
1785.0     4.556     51.6
1786.0     4.541     51.4
1787.0     4.526     51.3
1788.0     4.511     51.1
1789.0     4.496     51.0
1790.0     4.481     50.8
1791.0     4.465     50.7
1792.0     4.450     50.5
1793.0     4.435     50.4
1794.0     4.419     50.2
1795.0     4.404     50.1
1796.0     4.388     49.9
1797.0     4.373     49.7
1798.0     4.357     49.6
1799.0     4.341     49.4
1800.0     4.325     49.2
1801.0     4.310     49.1
1802.0     4.294     48.9
1803.0     4.278     48.7
1804.0     4.262     48.6
1805.0     4.246     48.4
1806.0     4.229     48.2
1807.0     4.213     48.1
1808.0     4.197     47.9
1809.0     4.181     47.7
1810.0     4.164     47.5
1811.0     4.148     47.4
1812.0     4.132     47.2
1813.0     4.115     47.0
1814.0     4.099     46.8
1815.0     4.082     46.6
1816.0     4.065     46.4
1817.0     4.049     46.3
1818.0     4.032     46.1
1819.0     4.015     45.9
1820.0     3.998     45.7
1821.0     3.981     45.5
1822.0     3.965     45.3
1823.0     3.948     45.1
1824.0     3.931     44.9
1825.0     3.913     44.7
1826.0     3.896     44.5
1827.0     3.879     44.3
1828.0     3.862     44.1
1829.0     3.845     43.9
1830.0     3.827     43.7
1831.0     3.810     43.5
1832.0     3.793     43.3
1833.0     3.775     43.0
1834.0     3.758     42.8
1835.0     3.740     42.6
1836.0     3.723     42.4
1837.0     3.705     42.2
1838.0     3.688     41.9
1839.0     3.670     41.7
1840.0     3.652     41.5
1841.0     3.635     41.3
1842.0     3.617     41.0
1843.0     3.599     40.8
1844.0     3.581     40.5
1845.0     3.563     40.3
1846.0     3.546     40.1
1847.0     3.528     39.8
1848.0     3.510     39.6
1849.0     3.492     39.3
1850.0     3.474     39.1
1851.0     3.456     38.8
1852.0     3.438     38.5
1853.0     3.420     38.3
1854.0     3.401     38.0
1855.0     3.383     37.8
1856.0     3.365     37.5
1857.0     3.347     37.2
1858.0     3.329     36.9
1859.0     3.311     36.7
1860.0     3.292     36.4
1861.0     3.274     36.1
1862.0     3.256     35.8
1863.0     3.238     35.5
1864.0     3.219     35.2
1865.0     3.201     34.9
1866.0     3.183     34.6
1867.0     3.164     34.3
1868.0     3.146     34.0
1869.0     3.128     33.7
1870.0     3.109     33.4
1871.0     3.091     33.1
1872.0     3.073     32.7
1873.0     3.054     32.4
1874.0     3.036     32.1
1875.0     3.018     31.7
1876.0     2.999     31.4
1877.0     2.981     31.1
1878.0     2.963     30.7
1879.0     2.944     30.3
1880.0     2.926     30.0
1881.0     2.908     29.6
1882.0     2.889     29.3
1883.0     2.871     28.9
1884.0     2.853     28.5
1885.0     2.835     28.1
1886.0     2.816     27.8
1887.0     2.798     27.4
1888.0     2.780     27.0
1889.0     2.762     26.6
1890.0     2.744     26.2
1891.0     2.726     25.8
1892.0     2.708     25.3
1893.0     2.690     24.9
1894.0     2.672     24.5
1895.0     2.654     24.1
1896.0     2.636     23.6
1897.0     2.618     23.2
1898.0     2.600     22.7
1899.0     2.583     22.3
1900.0     2.565     21.8
1901.0     2.548     21.3
1902.0     2.530     20.8
1903.0     2.513     20.4
1904.0     2.495     19.9
1905.0     2.478     19.4
1906.0     2.461     18.9
1907.0     2.444     18.4
1908.0     2.427     17.8
1909.0     2.410     17.3
1910.0     2.393     16.8
1911.0     2.376     16.2
1912.0     2.359     15.7
1913.0     2.343     15.1
1914.0     2.326     14.6
1915.0     2.310     14.0
1916.0     2.294     13.4
1917.0     2.278     12.8
1918.0     2.262     12.2
1919.0     2.246     11.6
1920.0     2.230     11.0
1921.0     2.214     10.4
1922.0     2.199      9.8
1923.0     2.184      9.1
1924.0     2.169      8.5
1925.0     2.154      7.8
1926.0     2.139      7.1
1927.0     2.124      6.5
1928.0     2.110      5.8
1929.0     2.095      5.1
1930.0     2.081      4.4
1931.0     2.067      3.7
1932.0     2.054      2.9
1933.0     2.040      2.2
1934.0     2.027      1.5
1935.0     2.014      0.7
1936.0     2.001    360.0
1937.0     1.988    359.2
1938.0     1.976    358.4
1939.0     1.964    357.6
1940.0     1.952    356.8
1941.0     1.940    356.0
1942.0     1.929    355.2
1943.0     1.917    354.3
1944.0     1.906    353.5
1945.0     1.896    352.6
1946.0     1.885    351.8
1947.0     1.875    350.9
1948.0     1.865    350.0
1949.0     1.856    349.2
1950.0     1.847    348.3
1951.0     1.838    347.3
1952.0     1.829    346.4
1953.0     1.821    345.5
1954.0     1.813    344.6
1955.0     1.805    343.6
1956.0     1.798    342.7
1957.0     1.791    341.7
1958.0     1.784    340.8
1959.0     1.777    339.8
1960.0     1.771    338.8
1961.0     1.766    337.8
1962.0     1.760    336.9
1963.0     1.755    335.9
1964.0     1.750    334.9
1965.0     1.746    333.9
1966.0     1.742    332.8
1967.0     1.738    331.8
1968.0     1.735    330.8
1969.0     1.732    329.8
1970.0     1.729    328.8
1971.0     1.727    327.7
1972.0     1.725    326.7
1973.0     1.723    325.7
1974.0     1.722    324.6
1975.0     1.721    323.6
1976.0     1.720    322.6
1977.0     1.719    321.5
1978.0     1.719    320.5
1979.0     1.719    319.4
1980.0     1.720    318.4
1981.0     1.721    317.4
1982.0     1.722    316.3
1983.0     1.723    315.3
1984.0     1.724    314.2
1985.0     1.726    313.2
1986.0     1.728    312.2
1987.0     1.730    311.2
1988.0     1.733    310.1
1989.0     1.735    309.1
1990.0     1.738    308.1
1991.0     1.741    307.1
1992.0     1.744    306.1
1993.0     1.747    305.0
1994.0     1.751    304.0
1995.0     1.754    303.0
1996.0     1.758    302.0
1997.0     1.761    301.1
1998.0     1.765    300.1
1999.0     1.769    299.1
2000.0     1.772    298.1
2001.0     1.776    297.1
2002.0     1.780    296.2
2003.0     1.783    295.2
2004.0     1.787    294.2
2005.0     1.790    293.3
2006.0     1.793    292.3
2007.0     1.796    291.3
2008.0     1.799    290.4
2009.0     1.802    289.4
2010.0     1.804    288.5
2011.0     1.806    287.6
2012.0     1.808    286.6
2013.0     1.809    285.7
2014.0     1.810    284.7
2015.0     1.810    283.8
2016.0     1.810    282.9
2017.0     1.810    281.9
2018.0     1.809    281.0
2019.0     1.807    280.0
2020.0     1.804    279.1
2021.0     1.801    278.1
2022.0     1.798    277.2
2023.0     1.793    276.2
2024.0     1.787    275.3
2025.0     1.781    274.3
2026.0     1.774    273.3
2027.0     1.765    272.4
2028.0     1.756    271.4
2029.0     1.746    270.4
2030.0     1.734    269.4
2031.0     1.721    268.3
2032.0     1.707    267.3
2033.0     1.692    266.2
2034.0     1.675    265.1
2035.0     1.657    264.0
2036.0     1.638    262.9
2037.0     1.617    261.7
2038.0     1.595    260.5
2039.0     1.572    259.3
2040.0     1.546    258.1
2041.0     1.520    256.7
2042.0     1.492    255.4
2043.0     1.463    254.0
2044.0     1.432    252.5
2045.0     1.400    251.0
2046.0     1.367    249.4
2047.0     1.333    247.7
2048.0     1.298    245.9
2049.0     1.262    244.0
2050.0     1.226    242.1
2051.0     1.189    239.9
2052.0     1.152    237.7
2053.0     1.115    235.3
2054.0     1.078    232.7
2055.0     1.041    230.0
2056.0     1.006    227.1
2057.0     0.972    223.9
2058.0     0.940    220.6
2059.0     0.909    217.0
2060.0     0.882    213.1
2061.0     0.857    209.1
2062.0     0.835    204.8
2063.0     0.818    200.3
2064.0     0.805    195.6
2065.0     0.796    190.8
2066.0     0.792    185.9
2067.0     0.793    181.0
2068.0     0.798    176.1
2069.0     0.809    171.4
2070.0     0.824    166.7
2071.0     0.844    162.3
2072.0     0.867    158.1
2073.0     0.894    154.1
2074.0     0.925    150.4
2075.0     0.958    147.0
2076.0     0.994    143.7
2077.0     1.032    140.7
2078.0     1.072    137.9
2079.0     1.113    135.4
2080.0     1.156    133.0
2081.0     1.200    130.8
2082.0     1.245    128.7
2083.0     1.291    126.8
2084.0     1.337    125.0
2085.0     1.384    123.3
2086.0     1.431    121.8
2087.0     1.478    120.3
2088.0     1.526    119.0
2089.0     1.574    117.7
2090.0     1.621    116.5
2091.0     1.669    115.4
2092.0     1.717    114.3
2093.0     1.764    113.3
2094.0     1.812    112.3
2095.0     1.859    111.4
2096.0     1.906    110.5
2097.0     1.953    109.7
2098.0     1.999    108.9
2099.0     2.046    108.2
2100.0     2.092    107.4
2101.0     2.138    106.8
2102.0     2.183    106.1
2103.0     2.228    105.5
2104.0     2.273    104.9
2105.0     2.317    104.3
2106.0     2.361    103.7
2107.0     2.405    103.2
2108.0     2.448    102.6
2109.0     2.491    102.1
2110.0     2.534    101.7
2111.0     2.576    101.2
2112.0     2.618    100.7
2113.0     2.660    100.3
2114.0     2.701     99.9
2115.0     2.742     99.4
2116.0     2.782     99.0
2117.0     2.822     98.6
2118.0     2.862     98.3
2119.0     2.901     97.9
2120.0     2.940     97.5
2121.0     2.979     97.2
2122.0     3.017     96.8
2123.0     3.055     96.5
2124.0     3.092     96.2
2125.0     3.129     95.9
2126.0     3.166     95.6
2127.0     3.203     95.3
2128.0     3.239     95.0
2129.0     3.274     94.7
2130.0     3.310     94.4
2131.0     3.345     94.1
2132.0     3.380     93.8
2133.0     3.414     93.6
2134.0     3.448     93.3
2135.0     3.482     93.1
2136.0     3.515     92.8
2137.0     3.548     92.6
2138.0     3.581     92.3
2139.0     3.614     92.1
2140.0     3.646     91.8
2141.0     3.678     91.6
2142.0     3.709     91.4
2143.0     3.740     91.2
2144.0     3.771     90.9
2145.0     3.802     90.7
2146.0     3.832     90.5
2147.0     3.862     90.3
2148.0     3.892     90.1
2149.0     3.921     89.9
2150.0     3.950     89.7
2151.0     3.979     89.5
2152.0     4.008     89.3
2153.0     4.036     89.1
2154.0     4.064     88.9
2155.0     4.092     88.8
2156.0     4.119     88.6
2157.0     4.146     88.4
2158.0     4.173     88.2
2159.0     4.200     88.0
2160.0     4.226     87.9
2161.0     4.252     87.7
2162.0     4.278     87.5
2163.0     4.304     87.4
2164.0     4.329     87.2
2165.0     4.354     87.0
2166.0     4.379     86.9
2167.0     4.403     86.7
2168.0     4.428     86.6
2169.0     4.452     86.4
2170.0     4.476     86.2
2171.0     4.499     86.1
2172.0     4.523     85.9
2173.0     4.546     85.8
2174.0     4.569     85.6
2175.0     4.591     85.5
2176.0     4.614     85.4
2177.0     4.636     85.2
2178.0     4.658     85.1
2179.0     4.680     84.9
2180.0     4.701     84.8
2181.0     4.722     84.6
2182.0     4.743     84.5
2183.0     4.764     84.4
2184.0     4.785     84.2
2185.0     4.805     84.1
2186.0     4.825     84.0
2187.0     4.845     83.8
2188.0     4.865     83.7
2189.0     4.885     83.6
2190.0     4.904     83.5
2191.0     4.923     83.3
2192.0     4.942     83.2
2193.0     4.961     83.1
2194.0     4.979     83.0
2195.0     4.998     82.8
2196.0     5.016     82.7
2197.0     5.034     82.6
2198.0     5.052     82.5
2199.0     5.069     82.3
2200.0     5.086     82.2
2201.0     5.104     82.1
2202.0     5.121     82.0
2203.0     5.137     81.9
2204.0     5.154     81.8
2205.0     5.170     81.6
2206.0     5.187     81.5
2207.0     5.203     81.4
2208.0     5.218     81.3
2209.0     5.234     81.2
2210.0     5.250     81.1
2211.0     5.265     81.0
2212.0     5.280     80.9
2213.0     5.295     80.7
2214.0     5.310     80.6
2215.0     5.324     80.5
2216.0     5.339     80.4
2217.0     5.353     80.3
2218.0     5.367     80.2
2219.0     5.381     80.1
2220.0     5.395     80.0
2221.0     5.408     79.9
2222.0     5.422     79.8
2223.0     5.435     79.7
2224.0     5.448     79.6
2225.0     5.461     79.5
2226.0     5.474     79.4
2227.0     5.486     79.3
2228.0     5.499     79.2
2229.0     5.511     79.1
2230.0     5.523     79.0
2231.0     5.535     78.9
2232.0     5.547     78.8
2233.0     5.558     78.7
2234.0     5.570     78.6
2235.0     5.581     78.5
2236.0     5.592     78.4
2237.0     5.603     78.3
2238.0     5.614     78.2
2239.0     5.625     78.1
2240.0     5.635     78.0
2241.0     5.646     77.9
2242.0     5.656     77.8
2243.0     5.666     77.7
2244.0     5.676     77.6
2245.0     5.686     77.5
2246.0     5.696     77.4
2247.0     5.705     77.3
2248.0     5.714     77.2
2249.0     5.724     77.1
2250.0     5.733     77.0
2251.0     5.742     76.9
2252.0     5.750     76.8
2253.0     5.759     76.7
2254.0     5.768     76.6
2255.0     5.776     76.6
2256.0     5.784     76.5
2257.0     5.792     76.4
2258.0     5.800     76.3
2259.0     5.808     76.2
2260.0     5.816     76.1
2261.0     5.823     76.0
2262.0     5.831     75.9
2263.0     5.838     75.8
2264.0     5.845     75.7
2265.0     5.852     75.6
2266.0     5.859     75.6
2267.0     5.866     75.5
2268.0     5.873     75.4
2269.0     5.879     75.3
2270.0     5.885     75.2
2271.0     5.892     75.1
2272.0     5.898     75.0
2273.0     5.904     74.9
2274.0     5.910     74.8
2275.0     5.915     74.8
2276.0     5.921     74.7
2277.0     5.926     74.6
2278.0     5.932     74.5
2279.0     5.937     74.4
2280.0     5.942     74.3
2281.0     5.947     74.2
2282.0     5.952     74.1
2283.0     5.957     74.1
2284.0     5.961     74.0
2285.0     5.966     73.9
2286.0     5.970     73.8
2287.0     5.974     73.7
2288.0     5.979     73.6
2289.0     5.983     73.5
2290.0     5.986     73.5
2291.0     5.990     73.4
2292.0     5.994     73.3
2293.0     5.997     73.2
2294.0     6.001     73.1
2295.0     6.004     73.0
2296.0     6.007     72.9
2297.0     6.010     72.9
2298.0     6.013     72.8
2299.0     6.016     72.7
2300.0     6.019     72.6
2301.0     6.022     72.5
2302.0     6.024     72.4
2303.0     6.026     72.3
2304.0     6.029     72.3
2305.0     6.031     72.2
2306.0     6.033     72.1
2307.0     6.035     72.0
2308.0     6.037     71.9
2309.0     6.038     71.8
2310.0     6.040     71.8
2311.0     6.041     71.7
2312.0     6.043     71.6
2313.0     6.044     71.5
2314.0     6.045     71.4
2315.0     6.046     71.3
2316.0     6.047     71.3
2317.0     6.048     71.2
2318.0     6.049     71.1
2319.0     6.050     71.0
2320.0     6.050     70.9
2321.0     6.051     70.8
2322.0     6.051     70.7
2323.0     6.051     70.7
2324.0     6.051     70.6
2325.0     6.051     70.5
2326.0     6.051     70.4
2327.0     6.051     70.3
2328.0     6.051     70.2
2329.0     6.050     70.2
2330.0     6.050     70.1
2331.0     6.049     70.0
2332.0     6.048     69.9
2333.0     6.048     69.8
2334.0     6.047     69.7
2335.0     6.046     69.7
2336.0     6.045     69.6
2337.0     6.043     69.5
2338.0     6.042     69.4
2339.0     6.041     69.3
2340.0     6.039     69.2
2341.0     6.037     69.2
2342.0     6.036     69.1
2343.0     6.034     69.0
2344.0     6.032     68.9
2345.0     6.030     68.8
2346.0     6.028     68.7
2347.0     6.026     68.6
2348.0     6.023     68.6
2349.0     6.021     68.5
2350.0     6.019     68.4
2351.0     6.016     68.3
2352.0     6.013     68.2
2353.0     6.011     68.1
2354.0     6.008     68.1
2355.0     6.005     68.0
2356.0     6.002     67.9
2357.0     5.999     67.8
2358.0     5.995     67.7
2359.0     5.992     67.6
2360.0     5.988     67.5
2361.0     5.985     67.5
2362.0     5.981     67.4
2363.0     5.978     67.3
2364.0     5.974     67.2
2365.0     5.970     67.1
2366.0     5.966     67.0
2367.0     5.962     66.9
2368.0     5.958     66.8
2369.0     5.953     66.8
2370.0     5.949     66.7
2371.0     5.945     66.6
2372.0     5.940     66.5
2373.0     5.935     66.4
2374.0     5.931     66.3
2375.0     5.926     66.2
2376.0     5.921     66.2
2377.0     5.916     66.1
2378.0     5.911     66.0
2379.0     5.906     65.9
2380.0     5.901     65.8
2381.0     5.895     65.7
2382.0     5.890     65.6
2383.0     5.884     65.5
2384.0     5.879     65.4
2385.0     5.873     65.4
2386.0     5.867     65.3






Disclaimer
This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. The Double Star Calculator and the results generated are licensed under CC BY-NC-SA 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.


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