Double Star Calculator - Orbit

Orbital Elements for SLR20
WDS: SLR20 WDS ID/Discoverer
P: 429.600 Orbital period (years)
a: 1.899 Semi-major axis (arcseconds)
i: 109.7 Inclination (degrees)
Ω: 56.0 Longitude of ascending node (degrees)
T: 1972.880 Epoch of periastron passage (year)
e: 0.469 Eccentricity
ω: 344.6 Longitude of periastron (degrees)
Start-Year: 1810.2 Year
End-Year: 2239.8 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for SLR20
Position: 152236.49-475515.5 Epoch-2000 right ascension and declination
WDS-ID: 15226-4755 WDS designation
Discoverer Code: SLR20 Discover designation and components
ADS number: . Aitken Double Star catalog
HD number: 136466 HD catalog number
Hipparcos number: 75255 Hipparcos catalog number
V1: 8.33 Magnitude of the primary
V2: 8.67 Magnitude of the secondary
Equinox: 2000 Equinox
Date: 2014 Date of last observation
Orbit grade: 4 Orbit grade, ranging from :
1 = Definitive
2 = Good
3 = Reliable
4 = Preliminary
5 = Indeterminate
Flags: n Flags
Ephemerides: Ephemerides
Code: Tok2015c Reference

Double Star Orbit for SLR20



WDS 6th Orbit including measures of SLR20

-- 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 SLR20
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.565   344.60
--------------------------
1810.20    2.666   234.98
1811.20    2.660   234.86
1812.20    2.654   234.73
1813.20    2.648   234.60
1814.20    2.642   234.47
1815.20    2.636   234.34
1816.20    2.629   234.21
1817.20    2.623   234.08
1818.20    2.616   233.95
1819.20    2.609   233.82
1820.20    2.601   233.69
1821.20    2.594   233.56
1822.20    2.586   233.42
1823.20    2.578   233.29
1824.20    2.570   233.15
1825.20    2.562   233.01
1826.20    2.553   232.88
1827.20    2.545   232.74
1828.20    2.536   232.60
1829.20    2.526   232.46
1830.20    2.517   232.32
1831.20    2.508   232.17
1832.20    2.498   232.03
1833.20    2.488   231.89
1834.20    2.478   231.74
1835.20    2.467   231.59
1836.20    2.457   231.44
1837.20    2.446   231.29
1838.20    2.435   231.14
1839.20    2.424   230.99
1840.20    2.412   230.84
1841.20    2.401   230.68
1842.20    2.389   230.52
1843.20    2.377   230.37
1844.20    2.365   230.21
1845.20    2.352   230.04
1846.20    2.339   229.88
1847.20    2.327   229.72
1848.20    2.313   229.55
1849.20    2.300   229.38
1850.20    2.287   229.21
1851.20    2.273   229.04
1852.20    2.259   228.86
1853.20    2.244   228.68
1854.20    2.230   228.50
1855.20    2.215   228.32
1856.20    2.200   228.14
1857.20    2.185   227.95
1858.20    2.170   227.76
1859.20    2.154   227.57
1860.20    2.139   227.37
1861.20    2.123   227.17
1862.20    2.106   226.97
1863.20    2.090   226.77
1864.20    2.073   226.56
1865.20    2.056   226.35
1866.20    2.039   226.13
1867.20    2.022   225.92
1868.20    2.004   225.69
1869.20    1.986   225.47
1870.20    1.968   225.24
1871.20    1.950   225.00
1872.20    1.931   224.76
1873.20    1.913   224.52
1874.20    1.894   224.27
1875.20    1.874   224.02
1876.20    1.855   223.76
1877.20    1.835   223.50
1878.20    1.815   223.23
1879.20    1.795   222.95
1880.20    1.775   222.67
1881.20    1.754   222.38
1882.20    1.733   222.08
1883.20    1.712   221.78
1884.20    1.691   221.47
1885.20    1.669   221.15
1886.20    1.647   220.82
1887.20    1.625   220.49
1888.20    1.603   220.14
1889.20    1.581   219.79
1890.20    1.558   219.42
1891.20    1.535   219.05
1892.20    1.512   218.66
1893.20    1.489   218.26
1894.20    1.465   217.85
1895.20    1.441   217.42
1896.20    1.417   216.98
1897.20    1.393   216.52
1898.20    1.369   216.05
1899.20    1.344   215.56
1900.20    1.319   215.05
1901.20    1.294   214.53
1902.20    1.269   213.98
1903.20    1.244   213.41
1904.20    1.218   212.82
1905.20    1.192   212.20
1906.20    1.167   211.55
1907.20    1.141   210.87
1908.20    1.114   210.17
1909.20    1.088   209.42
1910.20    1.062   208.64
1911.20    1.035   207.83
1912.20    1.009   206.96
1913.20    0.982   206.06
1914.20    0.955   205.10
1915.20    0.929   204.08
1916.20    0.902   203.01
1917.20    0.876   201.87
1918.20    0.849   200.66
1919.20    0.823   199.37
1920.20    0.796   198.00
1921.20    0.770   196.53
1922.20    0.744   194.96
1923.20    0.719   193.28
1924.20    0.694   191.48
1925.20    0.669   189.54
1926.20    0.645   187.45
1927.20    0.621   185.20
1928.20    0.598   182.78
1929.20    0.576   180.17
1930.20    0.556   177.36
1931.20    0.536   174.34
1932.20    0.517   171.09
1933.20    0.501   167.62
1934.20    0.485   163.91
1935.20    0.472   159.98
1936.20    0.461   155.84
1937.20    0.452   151.52
1938.20    0.445   147.04
1939.20    0.441   142.46
1940.20    0.440   137.81
1941.20    0.441   133.16
1942.20    0.444   128.56
1943.20    0.450   124.06
1944.20    0.459   119.71
1945.20    0.470   115.53
1946.20    0.482   111.55
1947.20    0.497   107.80
1948.20    0.513   104.26
1949.20    0.530   100.95
1950.20    0.549    97.86
1951.20    0.569    94.98
1952.20    0.589    92.29
1953.20    0.610    89.79
1954.20    0.631    87.45
1955.20    0.653    85.27
1956.20    0.675    83.23
1957.20    0.697    81.32
1958.20    0.719    79.52
1959.20    0.741    77.84
1960.20    0.762    76.24
1961.20    0.784    74.74
1962.20    0.804    73.31
1963.20    0.824    71.95
1964.20    0.844    70.66
1965.20    0.863    69.42
1966.20    0.880    68.24
1967.20    0.898    67.10
1968.20    0.914    66.00
1969.20    0.929    64.95
1970.20    0.943    63.92
1971.20    0.957    62.92
1972.20    0.969    61.95
1973.20    0.980    61.00
1974.20    0.990    60.08
1975.20    0.998    59.17
1976.20    1.006    58.27
1977.20    1.012    57.39
1978.20    1.018    56.51
1979.20    1.022    55.65
1980.20    1.024    54.79
1981.20    1.026    53.93
1982.20    1.027    53.08
1983.20    1.026    52.22
1984.20    1.024    51.37
1985.20    1.022    50.51
1986.20    1.018    49.64
1987.20    1.013    48.77
1988.20    1.007    47.89
1989.20    1.001    47.00
1990.20    0.993    46.09
1991.20    0.985    45.17
1992.20    0.976    44.24
1993.20    0.966    43.28
1994.20    0.955    42.31
1995.20    0.944    41.31
1996.20    0.932    40.29
1997.20    0.920    39.24
1998.20    0.907    38.16
1999.20    0.894    37.05
2000.20    0.880    35.91
2001.20    0.866    34.73
2002.20    0.851    33.51
2003.20    0.837    32.24
2004.20    0.822    30.94
2005.20    0.807    29.58
2006.20    0.792    28.17
2007.20    0.777    26.71
2008.20    0.762    25.19
2009.20    0.747    23.61
2010.20    0.732    21.96
2011.20    0.717    20.25
2012.20    0.703    18.46
2013.20    0.689    16.61
2014.20    0.675    14.67
2015.20    0.662    12.66
2016.20    0.649    10.57
2017.20    0.637     8.39
2018.20    0.626     6.14
2019.20    0.615     3.80
2020.20    0.605     1.38
2021.20    0.596   358.89
2022.20    0.588   356.32
2023.20    0.581   353.68
2024.20    0.575   350.99
2025.20    0.570   348.24
2026.20    0.566   345.44
2027.20    0.563   342.61
2028.20    0.561   339.76
2029.20    0.561   336.90
2030.20    0.561   334.04
2031.20    0.564   331.20
2032.20    0.567   328.38
2033.20    0.571   325.60
2034.20    0.577   322.87
2035.20    0.583   320.19
2036.20    0.591   317.58
2037.20    0.600   315.04
2038.20    0.609   312.58
2039.20    0.620   310.20
2040.20    0.632   307.90
2041.20    0.644   305.69
2042.20    0.657   303.56
2043.20    0.671   301.52
2044.20    0.685   299.56
2045.20    0.700   297.69
2046.20    0.716   295.90
2047.20    0.732   294.18
2048.20    0.749   292.54
2049.20    0.766   290.97
2050.20    0.783   289.47
2051.20    0.801   288.04
2052.20    0.819   286.67
2053.20    0.838   285.36
2054.20    0.856   284.10
2055.20    0.875   282.90
2056.20    0.894   281.75
2057.20    0.914   280.65
2058.20    0.933   279.59
2059.20    0.953   278.58
2060.20    0.972   277.61
2061.20    0.992   276.68
2062.20    1.012   275.78
2063.20    1.032   274.92
2064.20    1.052   274.09
2065.20    1.072   273.29
2066.20    1.092   272.52
2067.20    1.112   271.78
2068.20    1.132   271.07
2069.20    1.152   270.38
2070.20    1.172   269.71
2071.20    1.192   269.07
2072.20    1.213   268.45
2073.20    1.233   267.84
2074.20    1.253   267.26
2075.20    1.273   266.70
2076.20    1.292   266.15
2077.20    1.312   265.62
2078.20    1.332   265.10
2079.20    1.352   264.60
2080.20    1.371   264.12
2081.20    1.391   263.65
2082.20    1.410   263.19
2083.20    1.430   262.74
2084.20    1.449   262.31
2085.20    1.468   261.89
2086.20    1.487   261.47
2087.20    1.506   261.07
2088.20    1.525   260.68
2089.20    1.544   260.30
2090.20    1.563   259.93
2091.20    1.581   259.56
2092.20    1.600   259.21
2093.20    1.618   258.86
2094.20    1.637   258.52
2095.20    1.655   258.19
2096.20    1.673   257.86
2097.20    1.691   257.54
2098.20    1.708   257.23
2099.20    1.726   256.93
2100.20    1.744   256.63
2101.20    1.761   256.34
2102.20    1.778   256.05
2103.20    1.795   255.77
2104.20    1.812   255.49
2105.20    1.829   255.22
2106.20    1.846   254.95
2107.20    1.863   254.69
2108.20    1.879   254.43
2109.20    1.895   254.18
2110.20    1.912   253.93
2111.20    1.928   253.69
2112.20    1.943   253.45
2113.20    1.959   253.21
2114.20    1.975   252.98
2115.20    1.990   252.75
2116.20    2.006   252.52
2117.20    2.021   252.30
2118.20    2.036   252.08
2119.20    2.051   251.87
2120.20    2.066   251.66
2121.20    2.080   251.45
2122.20    2.095   251.24
2123.20    2.109   251.04
2124.20    2.123   250.84
2125.20    2.137   250.64
2126.20    2.151   250.44
2127.20    2.165   250.25
2128.20    2.178   250.06
2129.20    2.192   249.87
2130.20    2.205   249.68
2131.20    2.218   249.50
2132.20    2.231   249.32
2133.20    2.244   249.14
2134.20    2.256   248.96
2135.20    2.269   248.78
2136.20    2.281   248.61
2137.20    2.293   248.44
2138.20    2.306   248.27
2139.20    2.317   248.10
2140.20    2.329   247.93
2141.20    2.341   247.77
2142.20    2.352   247.60
2143.20    2.363   247.44
2144.20    2.374   247.28
2145.20    2.385   247.12
2146.20    2.396   246.97
2147.20    2.407   246.81
2148.20    2.417   246.66
2149.20    2.428   246.50
2150.20    2.438   246.35
2151.20    2.448   246.20
2152.20    2.458   246.05
2153.20    2.467   245.90
2154.20    2.477   245.75
2155.20    2.486   245.61
2156.20    2.495   245.46
2157.20    2.504   245.32
2158.20    2.513   245.18
2159.20    2.522   245.03
2160.20    2.530   244.89
2161.20    2.539   244.75
2162.20    2.547   244.61
2163.20    2.555   244.48
2164.20    2.563   244.34
2165.20    2.571   244.20
2166.20    2.578   244.07
2167.20    2.586   243.93
2168.20    2.593   243.80
2169.20    2.600   243.66
2170.20    2.607   243.53
2171.20    2.614   243.40
2172.20    2.620   243.27
2173.20    2.627   243.14
2174.20    2.633   243.01
2175.20    2.639   242.88
2176.20    2.645   242.75
2177.20    2.651   242.62
2178.20    2.656   242.49
2179.20    2.662   242.37
2180.20    2.667   242.24
2181.20    2.672   242.11
2182.20    2.677   241.99
2183.20    2.682   241.86
2184.20    2.686   241.74
2185.20    2.691   241.61
2186.20    2.695   241.49
2187.20    2.699   241.36
2188.20    2.703   241.24
2189.20    2.707   241.12
2190.20    2.710   241.00
2191.20    2.714   240.87
2192.20    2.717   240.75
2193.20    2.720   240.63
2194.20    2.723   240.51
2195.20    2.726   240.39
2196.20    2.728   240.27
2197.20    2.731   240.14
2198.20    2.733   240.02
2199.20    2.735   239.90
2200.20    2.737   239.78
2201.20    2.738   239.66
2202.20    2.740   239.54
2203.20    2.741   239.42
2204.20    2.742   239.30
2205.20    2.743   239.18
2206.20    2.744   239.06
2207.20    2.745   238.95
2208.20    2.745   238.83
2209.20    2.745   238.71
2210.20    2.745   238.59
2211.20    2.745   238.47
2212.20    2.745   238.35
2213.20    2.745   238.23
2214.20    2.744   238.11
2215.20    2.743   237.99
2216.20    2.742   237.87
2217.20    2.741   237.75
2218.20    2.740   237.63
2219.20    2.738   237.51
2220.20    2.737   237.39
2221.20    2.735   237.27
2222.20    2.733   237.15
2223.20    2.730   237.03
2224.20    2.728   236.91
2225.20    2.725   236.79
2226.20    2.722   236.67
2227.20    2.719   236.55
2228.20    2.716   236.42
2229.20    2.713   236.30
2230.20    2.709   236.18
2231.20    2.706   236.06
2232.20    2.702   235.93
2233.20    2.698   235.81
2234.20    2.693   235.69
2235.20    2.689   235.56
2236.20    2.684   235.44
2237.20    2.679   235.31
2238.20    2.674   235.19
2239.20    2.669   235.06






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 17:14:18



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