Double Star Calculator - Orbit

Orbital Elements for BU1138AB
WDS: BU1138AB WDS ID/Discoverer
P: 314.090 Orbital period (years)
a: 0.26 Semi-major axis (arcseconds)
i: 96.4 Inclination (degrees)
Ω: 181.7 Longitude of ascending node (degrees)
T: 2003.290 Epoch of periastron passage (year)
e: 0.5 Eccentricity
ω: 302.8 Longitude of periastron (degrees)
Start-Year: 1867.955 Year
End-Year: 2182.045 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for BU1138AB
Position: 210248.62+455056.0 Epoch-2000 right ascension and declination
WDS-ID: 21028+4551 WDS designation
Discoverer Code: BU1138AB Discover designation and components
ADS number: 14585 Aitken Double Star catalog
HD number: 200595 HD catalog number
Hipparcos number: 103871 Hipparcos catalog number
V1: 7.1 Magnitude of the primary
V2: 7.3 Magnitude of the secondary
Equinox: 2000 Equinox
Date: 1985 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: Hrt2001b Reference

Double Star Orbit for BU1138AB



WDS 6th Orbit including measures of BU1138AB

-- 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 BU1138AB
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.165   179.64
--------------------------
1867.95    0.262     8.64
1868.95    0.263     8.53
1869.95    0.265     8.43
1870.95    0.267     8.32
1871.95    0.269     8.22
1872.95    0.270     8.12
1873.95    0.272     8.01
1874.95    0.274     7.91
1875.95    0.275     7.81
1876.95    0.277     7.72
1877.95    0.279     7.62
1878.95    0.280     7.52
1879.95    0.281     7.43
1880.95    0.283     7.33
1881.95    0.284     7.24
1882.95    0.286     7.15
1883.95    0.287     7.06
1884.95    0.288     6.97
1885.95    0.290     6.88
1886.95    0.291     6.79
1887.95    0.292     6.70
1888.95    0.293     6.61
1889.95    0.294     6.53
1890.95    0.295     6.44
1891.95    0.296     6.35
1892.95    0.297     6.27
1893.95    0.298     6.19
1894.95    0.299     6.10
1895.95    0.300     6.02
1896.95    0.301     5.94
1897.95    0.301     5.85
1898.95    0.302     5.77
1899.95    0.303     5.69
1900.95    0.303     5.61
1901.95    0.304     5.53
1902.95    0.304     5.45
1903.95    0.305     5.36
1904.95    0.305     5.28
1905.95    0.306     5.20
1906.95    0.306     5.12
1907.95    0.306     5.04
1908.95    0.306     4.96
1909.95    0.307     4.88
1910.95    0.307     4.81
1911.95    0.307     4.73
1912.95    0.307     4.65
1913.95    0.307     4.57
1914.95    0.307     4.49
1915.95    0.306     4.41
1916.95    0.306     4.33
1917.95    0.306     4.25
1918.95    0.306     4.17
1919.95    0.305     4.09
1920.95    0.305     4.01
1921.95    0.304     3.93
1922.95    0.304     3.85
1923.95    0.303     3.76
1924.95    0.302     3.68
1925.95    0.301     3.60
1926.95    0.301     3.52
1927.95    0.300     3.43
1928.95    0.299     3.35
1929.95    0.298     3.27
1930.95    0.296     3.18
1931.95    0.295     3.10
1932.95    0.294     3.01
1933.95    0.293     2.92
1934.95    0.291     2.84
1935.95    0.290     2.75
1936.95    0.288     2.66
1937.95    0.286     2.57
1938.95    0.284     2.47
1939.95    0.283     2.38
1940.95    0.281     2.29
1941.95    0.279     2.19
1942.95    0.277     2.09
1943.95    0.274     2.00
1944.95    0.272     1.90
1945.95    0.270     1.79
1946.95    0.267     1.69
1947.95    0.265     1.58
1948.95    0.262     1.48
1949.95    0.259     1.37
1950.95    0.256     1.25
1951.95    0.253     1.14
1952.95    0.250     1.02
1953.95    0.247     0.90
1954.95    0.244     0.77
1955.95    0.240     0.65
1956.95    0.237     0.52
1957.95    0.233     0.38
1958.95    0.229     0.24
1959.95    0.225     0.10
1960.95    0.221   359.95
1961.95    0.217   359.79
1962.95    0.213   359.63
1963.95    0.208   359.46
1964.95    0.204   359.28
1965.95    0.199   359.10
1966.95    0.194   358.90
1967.95    0.189   358.70
1968.95    0.184   358.49
1969.95    0.179   358.26
1970.95    0.173   358.02
1971.95    0.168   357.76
1972.95    0.162   357.49
1973.95    0.156   357.19
1974.95    0.150   356.87
1975.95    0.144   356.53
1976.95    0.138   356.15
1977.95    0.131   355.74
1978.95    0.125   355.28
1979.95    0.118   354.78
1980.95    0.111   354.20
1981.95    0.104   353.55
1982.95    0.097   352.81
1983.95    0.089   351.94
1984.95    0.082   350.92
1985.95    0.074   349.69
1986.95    0.067   348.17
1987.95    0.059   346.26
1988.95    0.051   343.76
1989.95    0.043   340.37
1990.95    0.036   335.50
1991.95    0.028   328.03
1992.95    0.022   315.68
1993.95    0.017   294.57
1994.95    0.015   264.16
1995.95    0.018   236.68
1996.95    0.024   219.55
1997.95    0.031   209.52
1998.95    0.039   203.26
1999.95    0.046   199.05
2000.95    0.054   196.04
2001.95    0.061   193.78
2002.95    0.069   192.02
2003.95    0.076   190.60
2004.95    0.083   189.43
2005.95    0.090   188.44
2006.95    0.097   187.58
2007.95    0.103   186.84
2008.95    0.109   186.18
2009.95    0.115   185.58
2010.95    0.121   185.04
2011.95    0.126   184.55
2012.95    0.130   184.09
2013.95    0.135   183.67
2014.95    0.139   183.27
2015.95    0.143   182.89
2016.95    0.146   182.53
2017.95    0.149   182.19
2018.95    0.152   181.86
2019.95    0.155   181.54
2020.95    0.157   181.24
2021.95    0.159   180.94
2022.95    0.161   180.64
2023.95    0.162   180.36
2024.95    0.163   180.07
2025.95    0.164   179.79
2026.95    0.165   179.52
2027.95    0.165   179.24
2028.95    0.166   178.97
2029.95    0.166   178.70
2030.95    0.166   178.42
2031.95    0.165   178.15
2032.95    0.165   177.88
2033.95    0.164   177.60
2034.95    0.164   177.32
2035.95    0.163   177.04
2036.95    0.162   176.76
2037.95    0.161   176.47
2038.95    0.159   176.18
2039.95    0.158   175.88
2040.95    0.156   175.58
2041.95    0.155   175.27
2042.95    0.153   174.95
2043.95    0.151   174.63
2044.95    0.149   174.30
2045.95    0.147   173.96
2046.95    0.145   173.61
2047.95    0.143   173.25
2048.95    0.141   172.88
2049.95    0.139   172.50
2050.95    0.136   172.10
2051.95    0.134   171.69
2052.95    0.132   171.27
2053.95    0.129   170.83
2054.95    0.126   170.37
2055.95    0.124   169.89
2056.95    0.121   169.39
2057.95    0.119   168.87
2058.95    0.116   168.33
2059.95    0.113   167.76
2060.95    0.110   167.16
2061.95    0.108   166.53
2062.95    0.105   165.86
2063.95    0.102   165.16
2064.95    0.099   164.42
2065.95    0.096   163.64
2066.95    0.093   162.80
2067.95    0.090   161.91
2068.95    0.087   160.97
2069.95    0.085   159.96
2070.95    0.082   158.88
2071.95    0.079   157.71
2072.95    0.076   156.46
2073.95    0.073   155.12
2074.95    0.070   153.66
2075.95    0.067   152.08
2076.95    0.065   150.37
2077.95    0.062   148.50
2078.95    0.059   146.47
2079.95    0.057   144.25
2080.95    0.054   141.82
2081.95    0.052   139.16
2082.95    0.050   136.25
2083.95    0.047   133.07
2084.95    0.045   129.59
2085.95    0.044   125.80
2086.95    0.042   121.69
2087.95    0.040   117.27
2088.95    0.039   112.56
2089.95    0.038   107.60
2090.95    0.038   102.43
2091.95    0.037    97.14
2092.95    0.037    91.81
2093.95    0.038    86.53
2094.95    0.038    81.38
2095.95    0.039    76.44
2096.95    0.041    71.75
2097.95    0.042    67.37
2098.95    0.044    63.30
2099.95    0.046    59.54
2100.95    0.048    56.10
2101.95    0.050    52.94
2102.95    0.052    50.06
2103.95    0.055    47.43
2104.95    0.057    45.03
2105.95    0.060    42.84
2106.95    0.062    40.83
2107.95    0.065    38.99
2108.95    0.068    37.30
2109.95    0.071    35.74
2110.95    0.074    34.31
2111.95    0.077    32.98
2112.95    0.079    31.75
2113.95    0.082    30.61
2114.95    0.085    29.55
2115.95    0.088    28.56
2116.95    0.091    27.64
2117.95    0.094    26.77
2118.95    0.097    25.96
2119.95    0.100    25.19
2120.95    0.104    24.47
2121.95    0.107    23.80
2122.95    0.110    23.16
2123.95    0.113    22.55
2124.95    0.116    21.98
2125.95    0.119    21.43
2126.95    0.122    20.91
2127.95    0.125    20.42
2128.95    0.128    19.95
2129.95    0.131    19.50
2130.95    0.134    19.07
2131.95    0.137    18.66
2132.95    0.140    18.27
2133.95    0.143    17.89
2134.95    0.145    17.53
2135.95    0.148    17.19
2136.95    0.151    16.85
2137.95    0.154    16.53
2138.95    0.157    16.22
2139.95    0.160    15.93
2140.95    0.163    15.64
2141.95    0.166    15.36
2142.95    0.168    15.09
2143.95    0.171    14.83
2144.95    0.174    14.58
2145.95    0.177    14.34
2146.95    0.180    14.10
2147.95    0.182    13.88
2148.95    0.185    13.65
2149.95    0.188    13.44
2150.95    0.190    13.23
2151.95    0.193    13.03
2152.95    0.196    12.83
2153.95    0.198    12.63
2154.95    0.201    12.45
2155.95    0.203    12.26
2156.95    0.206    12.09
2157.95    0.208    11.91
2158.95    0.211    11.74
2159.95    0.213    11.58
2160.95    0.216    11.41
2161.95    0.218    11.25
2162.95    0.221    11.10
2163.95    0.223    10.95
2164.95    0.225    10.80
2165.95    0.228    10.65
2166.95    0.230    10.51
2167.95    0.232    10.37
2168.95    0.235    10.23
2169.95    0.237    10.10
2170.95    0.239     9.97
2171.95    0.241     9.84
2172.95    0.243     9.71
2173.95    0.246     9.58
2174.95    0.248     9.46
2175.95    0.250     9.34
2176.95    0.252     9.22
2177.95    0.254     9.10
2178.95    0.256     8.99
2179.95    0.258     8.88
2180.95    0.260     8.76
2181.95    0.261     8.65






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 18:21:57



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