Double Star Calculator - Orbit

Orbital Elements for STF2118AB
WDS: STF2118AB WDS ID/Discoverer
P: 321.313 Orbital period (years)
a: 1.05927 Semi-major axis (arcseconds)
i: 96.216 Inclination (degrees)
Ω: 67.426 Longitude of ascending node (degrees)
T: 2076.985 Epoch of periastron passage (year)
e: 0.23973 Eccentricity
ω: 112.091 Longitude of periastron (degrees)
Start-Year: 1864.34345 Year
End-Year: 2185.65655 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for STF2118AB
Position: 165625.32+650220.6 Epoch-2000 right ascension and declination
WDS-ID: 16564+6502 WDS designation
Discoverer Code: STF2118AB Discover designation and components
ADS number: 10279 Aitken Double Star catalog
HD number: 153697 HD catalog number
Hipparcos number: 82898 Hipparcos catalog number
V1: 7.07 Magnitude of the primary
V2: 7.30 Magnitude of the secondary
Equinox: Equinox
Date: 2015 Date of last observation
Orbit grade: 3 Orbit grade, ranging from :
1 = Definitive
2 = Good
3 = Reliable
4 = Preliminary
5 = Indeterminate
Flags: n Flags
Ephemerides: Ephemerides
Code: Izm2019 Reference

Double Star Orbit for STF2118AB



WDS 6th Orbit including measures of STF2118AB

-- 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 STF2118AB
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.849    63.98
--------------------------
1864.34    0.369   227.20
1865.34    0.355   226.19
1866.34    0.340   225.10
1867.34    0.326   223.91
1868.34    0.312   222.61
1869.34    0.298   221.19
1870.34    0.284   219.62
1871.34    0.270   217.89
1872.34    0.256   215.98
1873.34    0.243   213.85
1874.34    0.229   211.47
1875.34    0.217   208.82
1876.34    0.205   205.83
1877.34    0.193   202.48
1878.34    0.182   198.71
1879.34    0.172   194.48
1880.34    0.163   189.74
1881.34    0.155   184.49
1882.34    0.148   178.72
1883.34    0.143   172.49
1884.34    0.140   165.90
1885.34    0.139   159.10
1886.34    0.140   152.28
1887.34    0.142   145.62
1888.34    0.147   139.28
1889.34    0.153   133.37
1890.34    0.160   127.97
1891.34    0.169   123.09
1892.34    0.179   118.72
1893.34    0.190   114.83
1894.34    0.201   111.37
1895.34    0.213   108.29
1896.34    0.226   105.55
1897.34    0.239   103.10
1898.34    0.252   100.91
1899.34    0.266    98.94
1900.34    0.280    97.17
1901.34    0.294    95.56
1902.34    0.308    94.10
1903.34    0.323    92.77
1904.34    0.337    91.55
1905.34    0.351    90.44
1906.34    0.366    89.41
1907.34    0.381    88.46
1908.34    0.395    87.58
1909.34    0.410    86.77
1910.34    0.424    86.01
1911.34    0.439    85.30
1912.34    0.454    84.63
1913.34    0.468    84.01
1914.34    0.483    83.43
1915.34    0.497    82.88
1916.34    0.511    82.36
1917.34    0.526    81.86
1918.34    0.540    81.40
1919.34    0.554    80.96
1920.34    0.568    80.54
1921.34    0.582    80.14
1922.34    0.596    79.76
1923.34    0.610    79.39
1924.34    0.624    79.05
1925.34    0.637    78.71
1926.34    0.651    78.39
1927.34    0.664    78.09
1928.34    0.678    77.80
1929.34    0.691    77.51
1930.34    0.704    77.24
1931.34    0.717    76.98
1932.34    0.729    76.73
1933.34    0.742    76.48
1934.34    0.755    76.25
1935.34    0.767    76.02
1936.34    0.779    75.80
1937.34    0.791    75.58
1938.34    0.803    75.37
1939.34    0.815    75.17
1940.34    0.826    74.98
1941.34    0.838    74.79
1942.34    0.849    74.60
1943.34    0.860    74.42
1944.34    0.871    74.24
1945.34    0.882    74.07
1946.34    0.893    73.90
1947.34    0.903    73.74
1948.34    0.913    73.58
1949.34    0.923    73.42
1950.34    0.933    73.27
1951.34    0.943    73.12
1952.34    0.952    72.97
1953.34    0.961    72.83
1954.34    0.970    72.68
1955.34    0.979    72.55
1956.34    0.988    72.41
1957.34    0.996    72.27
1958.34    1.004    72.14
1959.34    1.012    72.01
1960.34    1.020    71.88
1961.34    1.027    71.76
1962.34    1.034    71.63
1963.34    1.041    71.51
1964.34    1.048    71.39
1965.34    1.055    71.27
1966.34    1.061    71.15
1967.34    1.067    71.03
1968.34    1.073    70.92
1969.34    1.078    70.81
1970.34    1.083    70.69
1971.34    1.088    70.58
1972.34    1.093    70.47
1973.34    1.097    70.36
1974.34    1.101    70.25
1975.34    1.105    70.14
1976.34    1.109    70.03
1977.34    1.112    69.93
1978.34    1.115    69.82
1979.34    1.118    69.71
1980.34    1.120    69.61
1981.34    1.122    69.50
1982.34    1.124    69.40
1983.34    1.126    69.29
1984.34    1.127    69.19
1985.34    1.128    69.09
1986.34    1.128    68.98
1987.34    1.129    68.88
1988.34    1.129    68.77
1989.34    1.128    68.67
1990.34    1.127    68.57
1991.34    1.126    68.46
1992.34    1.125    68.36
1993.34    1.123    68.25
1994.34    1.121    68.15
1995.34    1.118    68.04
1996.34    1.116    67.94
1997.34    1.112    67.83
1998.34    1.109    67.72
1999.34    1.105    67.62
2000.34    1.101    67.51
2001.34    1.096    67.40
2002.34    1.091    67.29
2003.34    1.086    67.18
2004.34    1.080    67.06
2005.34    1.074    66.95
2006.34    1.067    66.83
2007.34    1.060    66.72
2008.34    1.053    66.60
2009.34    1.045    66.48
2010.34    1.037    66.36
2011.34    1.029    66.23
2012.34    1.020    66.11
2013.34    1.010    65.98
2014.34    1.001    65.85
2015.34    0.990    65.71
2016.34    0.980    65.58
2017.34    0.969    65.44
2018.34    0.957    65.30
2019.34    0.946    65.15
2020.34    0.933    65.00
2021.34    0.921    64.85
2022.34    0.908    64.69
2023.34    0.894    64.53
2024.34    0.880    64.36
2025.34    0.866    64.18
2026.34    0.851    64.01
2027.34    0.836    63.82
2028.34    0.821    63.63
2029.34    0.805    63.43
2030.34    0.788    63.22
2031.34    0.772    63.00
2032.34    0.755    62.78
2033.34    0.737    62.54
2034.34    0.719    62.29
2035.34    0.701    62.03
2036.34    0.682    61.75
2037.34    0.663    61.46
2038.34    0.643    61.15
2039.34    0.624    60.82
2040.34    0.603    60.47
2041.34    0.583    60.09
2042.34    0.562    59.69
2043.34    0.541    59.25
2044.34    0.519    58.78
2045.34    0.497    58.27
2046.34    0.475    57.71
2047.34    0.453    57.10
2048.34    0.430    56.42
2049.34    0.407    55.66
2050.34    0.384    54.82
2051.34    0.361    53.86
2052.34    0.337    52.78
2053.34    0.314    51.53
2054.34    0.290    50.08
2055.34    0.267    48.37
2056.34    0.243    46.33
2057.34    0.220    43.86
2058.34    0.197    40.80
2059.34    0.174    36.95
2060.34    0.153    31.98
2061.34    0.133    25.45
2062.34    0.115    16.73
2063.34    0.100     5.16
2064.34    0.091   350.50
2065.34    0.089   333.87
2066.34    0.094   317.72
2067.34    0.105   304.16
2068.34    0.121   293.70
2069.34    0.140   285.86
2070.34    0.161   279.97
2071.34    0.182   275.45
2072.34    0.205   271.92
2073.34    0.228   269.09
2074.34    0.252   266.79
2075.34    0.275   264.88
2076.34    0.298   263.27
2077.34    0.322   261.89
2078.34    0.345   260.70
2079.34    0.368   259.66
2080.34    0.391   258.75
2081.34    0.414   257.93
2082.34    0.436   257.20
2083.34    0.458   256.54
2084.34    0.480   255.94
2085.34    0.501   255.39
2086.34    0.522   254.88
2087.34    0.543   254.42
2088.34    0.563   253.99
2089.34    0.583   253.58
2090.34    0.602   253.21
2091.34    0.621   252.85
2092.34    0.639   252.52
2093.34    0.657   252.20
2094.34    0.674   251.91
2095.34    0.691   251.62
2096.34    0.707   251.35
2097.34    0.723   251.09
2098.34    0.738   250.85
2099.34    0.753   250.61
2100.34    0.767   250.38
2101.34    0.780   250.16
2102.34    0.793   249.95
2103.34    0.806   249.74
2104.34    0.817   249.54
2105.34    0.829   249.34
2106.34    0.839   249.15
2107.34    0.849   248.97
2108.34    0.859   248.79
2109.34    0.868   248.61
2110.34    0.876   248.44
2111.34    0.884   248.27
2112.34    0.891   248.10
2113.34    0.898   247.93
2114.34    0.904   247.77
2115.34    0.910   247.61
2116.34    0.915   247.45
2117.34    0.920   247.29
2118.34    0.924   247.14
2119.34    0.927   246.98
2120.34    0.930   246.83
2121.34    0.933   246.68
2122.34    0.935   246.53
2123.34    0.936   246.38
2124.34    0.937   246.22
2125.34    0.938   246.07
2126.34    0.938   245.92
2127.34    0.937   245.77
2128.34    0.936   245.62
2129.34    0.935   245.47
2130.34    0.933   245.32
2131.34    0.931   245.17
2132.34    0.928   245.02
2133.34    0.925   244.86
2134.34    0.921   244.71
2135.34    0.918   244.55
2136.34    0.913   244.39
2137.34    0.909   244.23
2138.34    0.903   244.07
2139.34    0.898   243.91
2140.34    0.892   243.74
2141.34    0.886   243.58
2142.34    0.879   243.41
2143.34    0.873   243.24
2144.34    0.865   243.06
2145.34    0.858   242.88
2146.34    0.850   242.70
2147.34    0.842   242.52
2148.34    0.833   242.33
2149.34    0.825   242.14
2150.34    0.816   241.94
2151.34    0.806   241.74
2152.34    0.797   241.53
2153.34    0.787   241.32
2154.34    0.777   241.11
2155.34    0.766   240.88
2156.34    0.756   240.65
2157.34    0.745   240.42
2158.34    0.734   240.18
2159.34    0.722   239.93
2160.34    0.711   239.67
2161.34    0.699   239.41
2162.34    0.687   239.13
2163.34    0.675   238.85
2164.34    0.663   238.55
2165.34    0.650   238.24
2166.34    0.638   237.92
2167.34    0.625   237.59
2168.34    0.612   237.25
2169.34    0.599   236.89
2170.34    0.585   236.51
2171.34    0.572   236.11
2172.34    0.558   235.70
2173.34    0.545   235.27
2174.34    0.531   234.81
2175.34    0.517   234.33
2176.34    0.503   233.82
2177.34    0.489   233.28
2178.34    0.475   232.71
2179.34    0.460   232.11
2180.34    0.446   231.46
2181.34    0.432   230.78
2182.34    0.417   230.04
2183.34    0.403   229.26
2184.34    0.388   228.41
2185.34    0.374   227.50






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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 17:32:12



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