Double Star Calculator - Orbit

Orbital Elements for B1581

WDS:	B1581	WDS ID/Discoverer
P:	250.000	Orbital period (years)
a:	0.43	Semi-major axis (arcseconds)
i:	110.1	Inclination (degrees)
Ω:	303.2	Longitude of ascending node (degrees)
T:	2028.110	Epoch of periastron passage (year)
e:	0.507	Eccentricity
ω:	133.0	Longitude of periastron (degrees)
Start-Year:	1900.0	Year
End-Year:	2150.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for B1581
Position:	080702.10-295348.3	Epoch-2000 right ascension and declination
WDS-ID:	08070-2954	WDS designation
Discoverer Code:	B1581	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	67473	HD catalog number
Hipparcos number:	39713	Hipparcos catalog number
V1:	9.61	Magnitude of the primary
V2:	9.94	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2020	Date of last observation
Orbit grade:	5	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Tok2021c	Reference

Double Star Orbit for B1581

WDS 6th Orbit including measures of B1581

-- 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 B1581

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.135   149.51
--------------------------
1900.00    0.459   324.56
1901.00    0.463   324.19
1902.00    0.467   323.83
1903.00    0.471   323.47
1904.00    0.474   323.12
1905.00    0.478   322.77
1906.00    0.482   322.43
1907.00    0.485   322.09
1908.00    0.488   321.75
1909.00    0.492   321.43
1910.00    0.495   321.10
1911.00    0.498   320.78
1912.00    0.501   320.47
1913.00    0.504   320.16
1914.00    0.507   319.85
1915.00    0.510   319.54
1916.00    0.513   319.24
1917.00    0.516   318.94
1918.00    0.518   318.65
1919.00    0.521   318.36
1920.00    0.523   318.07
1921.00    0.526   317.78
1922.00    0.528   317.50
1923.00    0.530   317.22
1924.00    0.532   316.94
1925.00    0.534   316.66
1926.00    0.536   316.38
1927.00    0.538   316.11
1928.00    0.540   315.84
1929.00    0.542   315.57
1930.00    0.543   315.30
1931.00    0.545   315.04
1932.00    0.546   314.77
1933.00    0.547   314.51
1934.00    0.548   314.24
1935.00    0.549   313.98
1936.00    0.550   313.72
1937.00    0.551   313.46
1938.00    0.552   313.20
1939.00    0.552   312.94
1940.00    0.553   312.68
1941.00    0.553   312.43
1942.00    0.553   312.17
1943.00    0.554   311.91
1944.00    0.554   311.65
1945.00    0.554   311.40
1946.00    0.553   311.14
1947.00    0.553   310.88
1948.00    0.553   310.62
1949.00    0.552   310.36
1950.00    0.551   310.10
1951.00    0.550   309.84
1952.00    0.549   309.58
1953.00    0.548   309.32
1954.00    0.547   309.06
1955.00    0.546   308.79
1956.00    0.544   308.53
1957.00    0.542   308.26
1958.00    0.541   307.99
1959.00    0.539   307.72
1960.00    0.536   307.45
1961.00    0.534   307.17
1962.00    0.532   306.90
1963.00    0.529   306.62
1964.00    0.526   306.33
1965.00    0.524   306.05
1966.00    0.520   305.76
1967.00    0.517   305.46
1968.00    0.514   305.17
1969.00    0.510   304.87
1970.00    0.506   304.56
1971.00    0.503   304.25
1972.00    0.498   303.94
1973.00    0.494   303.62
1974.00    0.490   303.29
1975.00    0.485   302.96
1976.00    0.480   302.62
1977.00    0.475   302.27
1978.00    0.470   301.92
1979.00    0.464   301.56
1980.00    0.458   301.19
1981.00    0.452   300.81
1982.00    0.446   300.42
1983.00    0.440   300.01
1984.00    0.433   299.60
1985.00    0.426   299.17
1986.00    0.419   298.73
1987.00    0.412   298.28
1988.00    0.405   297.80
1989.00    0.397   297.31
1990.00    0.389   296.80
1991.00    0.380   296.27
1992.00    0.372   295.71
1993.00    0.363   295.13
1994.00    0.354   294.51
1995.00    0.344   293.86
1996.00    0.335   293.18
1997.00    0.325   292.45
1998.00    0.314   291.68
1999.00    0.304   290.86
2000.00    0.293   289.97
2001.00    0.282   289.02
2002.00    0.271   287.99
2003.00    0.259   286.86
2004.00    0.247   285.63
2005.00    0.235   284.27
2006.00    0.223   282.77
2007.00    0.210   281.08
2008.00    0.197   279.18
2009.00    0.184   277.01
2010.00    0.171   274.52
2011.00    0.158   271.61
2012.00    0.146   268.19
2013.00    0.133   264.11
2014.00    0.121   259.19
2015.00    0.109   253.20
2016.00    0.099   245.88
2017.00    0.090   237.02
2018.00    0.084   226.54
2019.00    0.080   214.75
2020.00    0.080   202.40
2021.00    0.083   190.48
2022.00    0.089   179.80
2023.00    0.097   170.69
2024.00    0.107   163.14
2025.00    0.118   156.91
2026.00    0.130   151.76
2027.00    0.141   147.45
2028.00    0.153   143.80
2029.00    0.164   140.66
2030.00    0.175   137.91
2031.00    0.185   135.48
2032.00    0.195   133.30
2033.00    0.204   131.32
2034.00    0.212   129.49
2035.00    0.220   127.80
2036.00    0.226   126.22
2037.00    0.232   124.71
2038.00    0.237   123.28
2039.00    0.241   121.90
2040.00    0.245   120.57
2041.00    0.248   119.27
2042.00    0.250   118.00
2043.00    0.252   116.75
2044.00    0.253   115.51
2045.00    0.253   114.28
2046.00    0.254   113.06
2047.00    0.253   111.83
2048.00    0.252   110.59
2049.00    0.251   109.35
2050.00    0.250   108.09
2051.00    0.248   106.81
2052.00    0.246   105.52
2053.00    0.243   104.20
2054.00    0.240   102.85
2055.00    0.238   101.47
2056.00    0.235   100.05
2057.00    0.232    98.60
2058.00    0.228    97.11
2059.00    0.225    95.57
2060.00    0.222    93.99
2061.00    0.218    92.36
2062.00    0.215    90.67
2063.00    0.211    88.93
2064.00    0.208    87.13
2065.00    0.204    85.27
2066.00    0.201    83.35
2067.00    0.198    81.36
2068.00    0.194    79.31
2069.00    0.191    77.19
2070.00    0.188    75.00
2071.00    0.186    72.75
2072.00    0.183    70.43
2073.00    0.181    68.04
2074.00    0.179    65.60
2075.00    0.177    63.10
2076.00    0.175    60.55
2077.00    0.174    57.95
2078.00    0.172    55.31
2079.00    0.172    52.65
2080.00    0.171    49.96
2081.00    0.171    47.26
2082.00    0.171    44.56
2083.00    0.171    41.86
2084.00    0.172    39.18
2085.00    0.173    36.52
2086.00    0.174    33.90
2087.00    0.176    31.32
2088.00    0.177    28.79
2089.00    0.180    26.32
2090.00    0.182    23.90
2091.00    0.185    21.55
2092.00    0.187    19.27
2093.00    0.191    17.07
2094.00    0.194    14.93
2095.00    0.197    12.87
2096.00    0.201    10.88
2097.00    0.205     8.97
2098.00    0.209     7.12
2099.00    0.213     5.35
2100.00    0.217     3.65
2101.00    0.222     2.01
2102.00    0.226     0.44
2103.00    0.231   358.93
2104.00    0.236   357.48
2105.00    0.240   356.09
2106.00    0.245   354.75
2107.00    0.250   353.47
2108.00    0.255   352.23
2109.00    0.260   351.05
2110.00    0.265   349.90
2111.00    0.271   348.81
2112.00    0.276   347.75
2113.00    0.281   346.73
2114.00    0.286   345.75
2115.00    0.291   344.80
2116.00    0.297   343.89
2117.00    0.302   343.01
2118.00    0.307   342.16
2119.00    0.312   341.33
2120.00    0.317   340.54
2121.00    0.323   339.77
2122.00    0.328   339.02
2123.00    0.333   338.30
2124.00    0.338   337.60
2125.00    0.343   336.92
2126.00    0.349   336.26
2127.00    0.354   335.62
2128.00    0.359   335.00
2129.00    0.364   334.40
2130.00    0.369   333.81
2131.00    0.374   333.23
2132.00    0.379   332.68
2133.00    0.383   332.13
2134.00    0.388   331.60
2135.00    0.393   331.09
2136.00    0.398   330.58
2137.00    0.403   330.09
2138.00    0.407   329.61
2139.00    0.412   329.14
2140.00    0.416   328.68
2141.00    0.421   328.23
2142.00    0.425   327.79
2143.00    0.430   327.36
2144.00    0.434   326.94
2145.00    0.438   326.52
2146.00    0.443   326.12
2147.00    0.447   325.72
2148.00    0.451   325.33
2149.00    0.455   324.94

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 16:04:35