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

Double Star Calculator - Orbit

- Revision: $Rev: 1216 $
- Report created: 2025-07-11 18:38:17

Orbital Elements for COO197AB
WDS: COO197AB WDS ID/Discoverer
P: 727.181 Orbital period (years)
a: 3.06957 Semi-major axis (arcseconds)
i: 124.505 Inclination (degrees)
Ω: 69.493 Longitude of ascending node (degrees)
T: 1967.506 Epoch of periastron passage (year)
e: 0.11545 Eccentricity
ω: 291.245 Longitude of periastron (degrees)
Start-Year: 1662.0 Year
End-Year: 2388.0 Year
Epoch: 2025.0 Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for COO197AB
Position: 162517.59-490852.3 Epoch-2000 right ascension and declination
WDS-ID: 16253-4909 WDS designation
Discoverer Code: COO197AB Discover designation and components
ADS number: . Aitken Double Star catalog
HD number: 147633 HD catalog number
Hipparcos number: 80448 Hipparcos catalog number
V1: 8.11 Magnitude of the primary
V2: 8.23 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 COO197AB



WDS 6th Orbit including measures of COO197AB

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


Ephemeris of COO197AB
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     2.473     89.8
-------------------------
1662.0     2.738    279.6
1663.0     2.747    279.2
1664.0     2.756    278.9
1665.0     2.765    278.5
1666.0     2.774    278.2
1667.0     2.783    277.9
1668.0     2.791    277.5
1669.0     2.800    277.2
1670.0     2.809    276.8
1671.0     2.817    276.5
1672.0     2.826    276.2
1673.0     2.834    275.9
1674.0     2.842    275.5
1675.0     2.851    275.2
1676.0     2.859    274.9
1677.0     2.867    274.6
1678.0     2.875    274.2
1679.0     2.883    273.9
1680.0     2.891    273.6
1681.0     2.899    273.3
1682.0     2.907    273.0
1683.0     2.915    272.7
1684.0     2.922    272.4
1685.0     2.930    272.1
1686.0     2.937    271.8
1687.0     2.944    271.5
1688.0     2.952    271.2
1689.0     2.959    270.9
1690.0     2.966    270.6
1691.0     2.973    270.3
1692.0     2.980    270.0
1693.0     2.987    269.7
1694.0     2.994    269.4
1695.0     3.000    269.1
1696.0     3.007    268.8
1697.0     3.013    268.5
1698.0     3.020    268.2
1699.0     3.026    267.9
1700.0     3.032    267.6
1701.0     3.038    267.4
1702.0     3.044    267.1
1703.0     3.050    266.8
1704.0     3.055    266.5
1705.0     3.061    266.2
1706.0     3.067    265.9
1707.0     3.072    265.7
1708.0     3.077    265.4
1709.0     3.083    265.1
1710.0     3.088    264.8
1711.0     3.093    264.6
1712.0     3.097    264.3
1713.0     3.102    264.0
1714.0     3.107    263.7
1715.0     3.111    263.5
1716.0     3.116    263.2
1717.0     3.120    262.9
1718.0     3.124    262.7
1719.0     3.128    262.4
1720.0     3.132    262.1
1721.0     3.136    261.9
1722.0     3.139    261.6
1723.0     3.143    261.3
1724.0     3.146    261.1
1725.0     3.150    260.8
1726.0     3.153    260.5
1727.0     3.156    260.3
1728.0     3.159    260.0
1729.0     3.162    259.7
1730.0     3.164    259.5
1731.0     3.167    259.2
1732.0     3.169    259.0
1733.0     3.171    258.7
1734.0     3.173    258.4
1735.0     3.175    258.2
1736.0     3.177    257.9
1737.0     3.179    257.6
1738.0     3.181    257.4
1739.0     3.182    257.1
1740.0     3.183    256.9
1741.0     3.184    256.6
1742.0     3.186    256.4
1743.0     3.186    256.1
1744.0     3.187    255.8
1745.0     3.188    255.6
1746.0     3.188    255.3
1747.0     3.189    255.1
1748.0     3.189    254.8
1749.0     3.189    254.5
1750.0     3.189    254.3
1751.0     3.188    254.0
1752.0     3.188    253.8
1753.0     3.188    253.5
1754.0     3.187    253.3
1755.0     3.186    253.0
1756.0     3.185    252.7
1757.0     3.184    252.5
1758.0     3.183    252.2
1759.0     3.181    252.0
1760.0     3.180    251.7
1761.0     3.178    251.4
1762.0     3.176    251.2
1763.0     3.174    250.9
1764.0     3.172    250.7
1765.0     3.170    250.4
1766.0     3.168    250.1
1767.0     3.165    249.9
1768.0     3.162    249.6
1769.0     3.159    249.4
1770.0     3.156    249.1
1771.0     3.153    248.8
1772.0     3.150    248.6
1773.0     3.146    248.3
1774.0     3.143    248.0
1775.0     3.139    247.8
1776.0     3.135    247.5
1777.0     3.131    247.2
1778.0     3.127    247.0
1779.0     3.122    246.7
1780.0     3.118    246.4
1781.0     3.113    246.2
1782.0     3.108    245.9
1783.0     3.103    245.6
1784.0     3.098    245.3
1785.0     3.093    245.1
1786.0     3.087    244.8
1787.0     3.082    244.5
1788.0     3.076    244.2
1789.0     3.070    244.0
1790.0     3.064    243.7
1791.0     3.058    243.4
1792.0     3.052    243.1
1793.0     3.045    242.8
1794.0     3.038    242.5
1795.0     3.032    242.3
1796.0     3.025    242.0
1797.0     3.018    241.7
1798.0     3.010    241.4
1799.0     3.003    241.1
1800.0     2.995    240.8
1801.0     2.988    240.5
1802.0     2.980    240.2
1803.0     2.972    239.9
1804.0     2.964    239.6
1805.0     2.956    239.3
1806.0     2.947    239.0
1807.0     2.939    238.7
1808.0     2.930    238.4
1809.0     2.921    238.1
1810.0     2.912    237.8
1811.0     2.903    237.5
1812.0     2.894    237.2
1813.0     2.885    236.9
1814.0     2.875    236.6
1815.0     2.865    236.2
1816.0     2.856    235.9
1817.0     2.846    235.6
1818.0     2.836    235.3
1819.0     2.825    234.9
1820.0     2.815    234.6
1821.0     2.805    234.3
1822.0     2.794    233.9
1823.0     2.783    233.6
1824.0     2.773    233.3
1825.0     2.762    232.9
1826.0     2.751    232.6
1827.0     2.739    232.2
1828.0     2.728    231.9
1829.0     2.717    231.5
1830.0     2.705    231.2
1831.0     2.693    230.8
1832.0     2.682    230.4
1833.0     2.670    230.1
1834.0     2.658    229.7
1835.0     2.646    229.3
1836.0     2.633    229.0
1837.0     2.621    228.6
1838.0     2.609    228.2
1839.0     2.596    227.8
1840.0     2.583    227.4
1841.0     2.571    227.0
1842.0     2.558    226.6
1843.0     2.545    226.2
1844.0     2.532    225.8
1845.0     2.519    225.4
1846.0     2.506    225.0
1847.0     2.492    224.6
1848.0     2.479    224.1
1849.0     2.466    223.7
1850.0     2.452    223.3
1851.0     2.439    222.8
1852.0     2.425    222.4
1853.0     2.411    221.9
1854.0     2.398    221.5
1855.0     2.384    221.0
1856.0     2.370    220.6
1857.0     2.356    220.1
1858.0     2.342    219.6
1859.0     2.328    219.1
1860.0     2.314    218.7
1861.0     2.300    218.2
1862.0     2.286    217.7
1863.0     2.271    217.2
1864.0     2.257    216.6
1865.0     2.243    216.1
1866.0     2.229    215.6
1867.0     2.215    215.1
1868.0     2.200    214.5
1869.0     2.186    214.0
1870.0     2.172    213.4
1871.0     2.157    212.9
1872.0     2.143    212.3
1873.0     2.129    211.7
1874.0     2.115    211.1
1875.0     2.101    210.6
1876.0     2.086    210.0
1877.0     2.072    209.3
1878.0     2.058    208.7
1879.0     2.044    208.1
1880.0     2.030    207.5
1881.0     2.016    206.8
1882.0     2.002    206.2
1883.0     1.989    205.5
1884.0     1.975    204.9
1885.0     1.961    204.2
1886.0     1.948    203.5
1887.0     1.934    202.8
1888.0     1.921    202.1
1889.0     1.908    201.4
1890.0     1.894    200.6
1891.0     1.881    199.9
1892.0     1.869    199.2
1893.0     1.856    198.4
1894.0     1.843    197.6
1895.0     1.831    196.9
1896.0     1.819    196.1
1897.0     1.807    195.3
1898.0     1.795    194.5
1899.0     1.783    193.6
1900.0     1.771    192.8
1901.0     1.760    192.0
1902.0     1.749    191.1
1903.0     1.738    190.3
1904.0     1.727    189.4
1905.0     1.717    188.5
1906.0     1.707    187.6
1907.0     1.697    186.7
1908.0     1.687    185.8
1909.0     1.677    184.8
1910.0     1.668    183.9
1911.0     1.659    183.0
1912.0     1.651    182.0
1913.0     1.643    181.0
1914.0     1.635    180.1
1915.0     1.627    179.1
1916.0     1.620    178.1
1917.0     1.613    177.1
1918.0     1.606    176.1
1919.0     1.599    175.0
1920.0     1.593    174.0
1921.0     1.588    173.0
1922.0     1.583    171.9
1923.0     1.578    170.9
1924.0     1.573    169.8
1925.0     1.569    168.7
1926.0     1.565    167.7
1927.0     1.562    166.6
1928.0     1.559    165.5
1929.0     1.556    164.4
1930.0     1.554    163.4
1931.0     1.552    162.3
1932.0     1.550    161.2
1933.0     1.549    160.1
1934.0     1.549    159.0
1935.0     1.548    157.9
1936.0     1.549    156.8
1937.0     1.549    155.7
1938.0     1.550    154.6
1939.0     1.552    153.5
1940.0     1.553    152.4
1941.0     1.555    151.3
1942.0     1.558    150.3
1943.0     1.561    149.2
1944.0     1.564    148.1
1945.0     1.568    147.0
1946.0     1.572    146.0
1947.0     1.576    144.9
1948.0     1.581    143.9
1949.0     1.586    142.8
1950.0     1.592    141.8
1951.0     1.598    140.7
1952.0     1.604    139.7
1953.0     1.611    138.7
1954.0     1.617    137.7
1955.0     1.625    136.7
1956.0     1.632    135.7
1957.0     1.640    134.7
1958.0     1.648    133.8
1959.0     1.656    132.8
1960.0     1.665    131.8
1961.0     1.674    130.9
1962.0     1.683    130.0
1963.0     1.693    129.1
1964.0     1.703    128.1
1965.0     1.713    127.2
1966.0     1.723    126.4
1967.0     1.733    125.5
1968.0     1.744    124.6
1969.0     1.755    123.7
1970.0     1.766    122.9
1971.0     1.777    122.1
1972.0     1.789    121.2
1973.0     1.800    120.4
1974.0     1.812    119.6
1975.0     1.824    118.8
1976.0     1.836    118.0
1977.0     1.848    117.3
1978.0     1.861    116.5
1979.0     1.873    115.7
1980.0     1.886    115.0
1981.0     1.899    114.3
1982.0     1.911    113.6
1983.0     1.924    112.8
1984.0     1.937    112.1
1985.0     1.950    111.4
1986.0     1.963    110.8
1987.0     1.977    110.1
1988.0     1.990    109.4
1989.0     2.003    108.8
1990.0     2.017    108.1
1991.0     2.030    107.5
1992.0     2.044    106.8
1993.0     2.057    106.2
1994.0     2.071    105.6
1995.0     2.084    105.0
1996.0     2.098    104.4
1997.0     2.111    103.8
1998.0     2.125    103.2
1999.0     2.138    102.6
2000.0     2.152    102.1
2001.0     2.165    101.5
2002.0     2.179    100.9
2003.0     2.192    100.4
2004.0     2.206     99.8
2005.0     2.219     99.3
2006.0     2.232     98.8
2007.0     2.246     98.3
2008.0     2.259     97.7
2009.0     2.272     97.2
2010.0     2.285     96.7
2011.0     2.298     96.2
2012.0     2.311     95.7
2013.0     2.324     95.2
2014.0     2.337     94.8
2015.0     2.350     94.3
2016.0     2.363     93.8
2017.0     2.375     93.3
2018.0     2.388     92.9
2019.0     2.400     92.4
2020.0     2.413     92.0
2021.0     2.425     91.5
2022.0     2.437     91.1
2023.0     2.449     90.6
2024.0     2.461     90.2
2025.0     2.473     89.8
2026.0     2.484     89.3
2027.0     2.496     88.9
2028.0     2.508     88.5
2029.0     2.519     88.1
2030.0     2.530     87.7
2031.0     2.541     87.3
2032.0     2.552     86.8
2033.0     2.563     86.4
2034.0     2.574     86.0
2035.0     2.584     85.7
2036.0     2.595     85.3
2037.0     2.605     84.9
2038.0     2.615     84.5
2039.0     2.625     84.1
2040.0     2.635     83.7
2041.0     2.645     83.4
2042.0     2.655     83.0
2043.0     2.664     82.6
2044.0     2.673     82.2
2045.0     2.682     81.9
2046.0     2.691     81.5
2047.0     2.700     81.1
2048.0     2.709     80.8
2049.0     2.717     80.4
2050.0     2.726     80.1
2051.0     2.734     79.7
2052.0     2.742     79.4
2053.0     2.750     79.0
2054.0     2.758     78.7
2055.0     2.765     78.3
2056.0     2.773     78.0
2057.0     2.780     77.7
2058.0     2.787     77.3
2059.0     2.794     77.0
2060.0     2.801     76.6
2061.0     2.807     76.3
2062.0     2.814     76.0
2063.0     2.820     75.6
2064.0     2.826     75.3
2065.0     2.832     75.0
2066.0     2.838     74.7
2067.0     2.843     74.3
2068.0     2.849     74.0
2069.0     2.854     73.7
2070.0     2.859     73.4
2071.0     2.864     73.0
2072.0     2.868     72.7
2073.0     2.873     72.4
2074.0     2.877     72.1
2075.0     2.882     71.8
2076.0     2.886     71.5
2077.0     2.889     71.1
2078.0     2.893     70.8
2079.0     2.897     70.5
2080.0     2.900     70.2
2081.0     2.903     69.9
2082.0     2.906     69.6
2083.0     2.909     69.3
2084.0     2.912     69.0
2085.0     2.914     68.7
2086.0     2.917     68.3
2087.0     2.919     68.0
2088.0     2.921     67.7
2089.0     2.923     67.4
2090.0     2.924     67.1
2091.0     2.926     66.8
2092.0     2.927     66.5
2093.0     2.928     66.2
2094.0     2.929     65.9
2095.0     2.930     65.6
2096.0     2.931     65.3
2097.0     2.931     65.0
2098.0     2.931     64.7
2099.0     2.932     64.4
2100.0     2.932     64.1
2101.0     2.931     63.7
2102.0     2.931     63.4
2103.0     2.931     63.1
2104.0     2.930     62.8
2105.0     2.929     62.5
2106.0     2.928     62.2
2107.0     2.927     61.9
2108.0     2.926     61.6
2109.0     2.925     61.3
2110.0     2.923     61.0
2111.0     2.921     60.7
2112.0     2.919     60.4
2113.0     2.917     60.1
2114.0     2.915     59.8
2115.0     2.913     59.5
2116.0     2.910     59.1
2117.0     2.908     58.8
2118.0     2.905     58.5
2119.0     2.902     58.2
2120.0     2.899     57.9
2121.0     2.896     57.6
2122.0     2.893     57.3
2123.0     2.889     57.0
2124.0     2.886     56.6
2125.0     2.882     56.3
2126.0     2.878     56.0
2127.0     2.874     55.7
2128.0     2.870     55.4
2129.0     2.866     55.1
2130.0     2.861     54.7
2131.0     2.857     54.4
2132.0     2.852     54.1
2133.0     2.847     53.8
2134.0     2.842     53.4
2135.0     2.837     53.1
2136.0     2.832     52.8
2137.0     2.827     52.5
2138.0     2.822     52.1
2139.0     2.816     51.8
2140.0     2.811     51.5
2141.0     2.805     51.1
2142.0     2.799     50.8
2143.0     2.793     50.5
2144.0     2.787     50.1
2145.0     2.781     49.8
2146.0     2.775     49.5
2147.0     2.768     49.1
2148.0     2.762     48.8
2149.0     2.755     48.4
2150.0     2.749     48.1
2151.0     2.742     47.7
2152.0     2.735     47.4
2153.0     2.728     47.0
2154.0     2.721     46.7
2155.0     2.714     46.3
2156.0     2.707     46.0
2157.0     2.699     45.6
2158.0     2.692     45.2
2159.0     2.685     44.9
2160.0     2.677     44.5
2161.0     2.670     44.1
2162.0     2.662     43.8
2163.0     2.654     43.4
2164.0     2.646     43.0
2165.0     2.638     42.7
2166.0     2.630     42.3
2167.0     2.622     41.9
2168.0     2.614     41.5
2169.0     2.606     41.1
2170.0     2.598     40.7
2171.0     2.590     40.4
2172.0     2.581     40.0
2173.0     2.573     39.6
2174.0     2.565     39.2
2175.0     2.556     38.8
2176.0     2.548     38.4
2177.0     2.539     38.0
2178.0     2.530     37.5
2179.0     2.522     37.1
2180.0     2.513     36.7
2181.0     2.504     36.3
2182.0     2.496     35.9
2183.0     2.487     35.5
2184.0     2.478     35.0
2185.0     2.469     34.6
2186.0     2.460     34.2
2187.0     2.452     33.7
2188.0     2.443     33.3
2189.0     2.434     32.9
2190.0     2.425     32.4
2191.0     2.416     32.0
2192.0     2.407     31.5
2193.0     2.398     31.1
2194.0     2.389     30.6
2195.0     2.380     30.1
2196.0     2.371     29.7
2197.0     2.363     29.2
2198.0     2.354     28.7
2199.0     2.345     28.3
2200.0     2.336     27.8
2201.0     2.327     27.3
2202.0     2.318     26.8
2203.0     2.309     26.3
2204.0     2.301     25.8
2205.0     2.292     25.3
2206.0     2.283     24.8
2207.0     2.275     24.3
2208.0     2.266     23.8
2209.0     2.257     23.3
2210.0     2.249     22.8
2211.0     2.240     22.3
2212.0     2.232     21.7
2213.0     2.223     21.2
2214.0     2.215     20.7
2215.0     2.207     20.1
2216.0     2.198     19.6
2217.0     2.190     19.1
2218.0     2.182     18.5
2219.0     2.174     18.0
2220.0     2.166     17.4
2221.0     2.158     16.8
2222.0     2.150     16.3
2223.0     2.143     15.7
2224.0     2.135     15.1
2225.0     2.127     14.5
2226.0     2.120     14.0
2227.0     2.113     13.4
2228.0     2.105     12.8
2229.0     2.098     12.2
2230.0     2.091     11.6
2231.0     2.084     11.0
2232.0     2.077     10.4
2233.0     2.071      9.8
2234.0     2.064      9.2
2235.0     2.057      8.5
2236.0     2.051      7.9
2237.0     2.045      7.3
2238.0     2.039      6.7
2239.0     2.033      6.0
2240.0     2.027      5.4
2241.0     2.021      4.8
2242.0     2.015      4.1
2243.0     2.010      3.5
2244.0     2.005      2.8
2245.0     1.999      2.2
2246.0     1.994      1.5
2247.0     1.990      0.8
2248.0     1.985      0.2
2249.0     1.980    359.5
2250.0     1.976    358.8
2251.0     1.972    358.2
2252.0     1.967    357.5
2253.0     1.963    356.8
2254.0     1.960    356.1
2255.0     1.956    355.4
2256.0     1.953    354.8
2257.0     1.949    354.1
2258.0     1.946    353.4
2259.0     1.943    352.7
2260.0     1.941    352.0
2261.0     1.938    351.3
2262.0     1.936    350.6
2263.0     1.934    349.9
2264.0     1.931    349.2
2265.0     1.930    348.5
2266.0     1.928    347.8
2267.0     1.927    347.1
2268.0     1.925    346.4
2269.0     1.924    345.6
2270.0     1.923    344.9
2271.0     1.923    344.2
2272.0     1.922    343.5
2273.0     1.922    342.8
2274.0     1.921    342.1
2275.0     1.922    341.4
2276.0     1.922    340.7
2277.0     1.922    340.0
2278.0     1.923    339.3
2279.0     1.924    338.5
2280.0     1.925    337.8
2281.0     1.926    337.1
2282.0     1.927    336.4
2283.0     1.929    335.7
2284.0     1.930    335.0
2285.0     1.932    334.3
2286.0     1.934    333.6
2287.0     1.937    332.9
2288.0     1.939    332.2
2289.0     1.942    331.5
2290.0     1.945    330.8
2291.0     1.948    330.1
2292.0     1.951    329.4
2293.0     1.954    328.7
2294.0     1.958    328.0
2295.0     1.961    327.4
2296.0     1.965    326.7
2297.0     1.969    326.0
2298.0     1.974    325.3
2299.0     1.978    324.7
2300.0     1.982    324.0
2301.0     1.987    323.3
2302.0     1.992    322.7
2303.0     1.997    322.0
2304.0     2.002    321.3
2305.0     2.008    320.7
2306.0     2.013    320.0
2307.0     2.019    319.4
2308.0     2.025    318.8
2309.0     2.030    318.1
2310.0     2.036    317.5
2311.0     2.043    316.8
2312.0     2.049    316.2
2313.0     2.056    315.6
2314.0     2.062    315.0
2315.0     2.069    314.4
2316.0     2.076    313.8
2317.0     2.083    313.1
2318.0     2.090    312.5
2319.0     2.097    311.9
2320.0     2.104    311.3
2321.0     2.112    310.8
2322.0     2.119    310.2
2323.0     2.127    309.6
2324.0     2.135    309.0
2325.0     2.143    308.4
2326.0     2.151    307.9
2327.0     2.159    307.3
2328.0     2.167    306.7
2329.0     2.175    306.2
2330.0     2.183    305.6
2331.0     2.192    305.1
2332.0     2.200    304.5
2333.0     2.209    304.0
2334.0     2.217    303.5
2335.0     2.226    302.9
2336.0     2.235    302.4
2337.0     2.244    301.9
2338.0     2.253    301.4
2339.0     2.262    300.8
2340.0     2.271    300.3
2341.0     2.280    299.8
2342.0     2.289    299.3
2343.0     2.298    298.8
2344.0     2.308    298.3
2345.0     2.317    297.8
2346.0     2.326    297.4
2347.0     2.336    296.9
2348.0     2.345    296.4
2349.0     2.354    295.9
2350.0     2.364    295.4
2351.0     2.373    295.0
2352.0     2.383    294.5
2353.0     2.393    294.1
2354.0     2.402    293.6
2355.0     2.412    293.1
2356.0     2.421    292.7
2357.0     2.431    292.2
2358.0     2.441    291.8
2359.0     2.451    291.4
2360.0     2.460    290.9
2361.0     2.470    290.5
2362.0     2.480    290.1
2363.0     2.489    289.6
2364.0     2.499    289.2
2365.0     2.509    288.8
2366.0     2.519    288.4
2367.0     2.528    288.0
2368.0     2.538    287.6
2369.0     2.548    287.2
2370.0     2.557    286.8
2371.0     2.567    286.4
2372.0     2.577    286.0
2373.0     2.586    285.6
2374.0     2.596    285.2
2375.0     2.605    284.8
2376.0     2.615    284.4
2377.0     2.625    284.0
2378.0     2.634    283.6
2379.0     2.644    283.3
2380.0     2.653    282.9
2381.0     2.662    282.5
2382.0     2.672    282.1
2383.0     2.681    281.8
2384.0     2.690    281.4
2385.0     2.700    281.1
2386.0     2.709    280.7
2387.0     2.718    280.3






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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