Double Star Calculator - Orbit

Orbital Elements for A2681

WDS:	A2681	WDS ID/Discoverer
P:	208.330	Orbital period (years)
a:	0.273	Semi-major axis (arcseconds)
i:	119.4	Inclination (degrees)
Ω:	118.2	Longitude of ascending node (degrees)
T:	1938.470	Epoch of periastron passage (year)
e:	0.793	Eccentricity
ω:	339.1	Longitude of periastron (degrees)
Start-Year:	1920.835	Year
End-Year:	2129.165	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A2681
Position:	065729.02+025316.8	Epoch-2000 right ascension and declination
WDS-ID:	06575+0253	WDS designation
Discoverer Code:	A2681	Discover designation and components
ADS number:	5625	Aitken Double Star catalog
HD number:	51449	HD catalog number
Hipparcos number:	33474	Hipparcos catalog number
V1:	9.46	Magnitude of the primary
V2:	7.71	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	1997	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:	USN2007b	Reference

Double Star Orbit for A2681

WDS 6th Orbit including measures of A2681

-- 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 A2681

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.444   311.80
--------------------------
1920.84    0.196   283.87
1921.84    0.186   282.81
1922.84    0.176   281.64
1923.84    0.166   280.33
1924.84    0.155   278.83
1925.84    0.144   277.11
1926.84    0.133   275.10
1927.84    0.121   272.70
1928.84    0.109   269.78
1929.84    0.096   266.10
1930.84    0.083   261.30
1931.84    0.071   254.75
1932.84    0.058   245.33
1933.84    0.047   231.09
1934.84    0.039   209.70
1935.84    0.037   182.35
1936.84    0.042   156.92
1937.84    0.049   138.05
1938.84    0.056   124.14
1939.84    0.060   112.70
1940.84    0.061   102.16
1941.84    0.060    91.68
1942.84    0.059    80.89
1943.84    0.059    69.83
1944.84    0.059    58.76
1945.84    0.061    48.12
1946.84    0.064    38.30
1947.84    0.069    29.54
1948.84    0.074    21.91
1949.84    0.080    15.34
1950.84    0.086     9.72
1951.84    0.093     4.91
1952.84    0.100     0.77
1953.84    0.107   357.18
1954.84    0.115   354.04
1955.84    0.122   351.29
1956.84    0.129   348.85
1957.84    0.137   346.68
1958.84    0.144   344.73
1959.84    0.152   342.96
1960.84    0.159   341.36
1961.84    0.166   339.90
1962.84    0.173   338.56
1963.84    0.180   337.32
1964.84    0.187   336.18
1965.84    0.194   335.11
1966.84    0.200   334.12
1967.84    0.207   333.19
1968.84    0.214   332.32
1969.84    0.220   331.50
1970.84    0.226   330.73
1971.84    0.233   329.99
1972.84    0.239   329.30
1973.84    0.245   328.64
1974.84    0.251   328.01
1975.84    0.256   327.41
1976.84    0.262   326.84
1977.84    0.268   326.29
1978.84    0.273   325.77
1979.84    0.279   325.26
1980.84    0.284   324.78
1981.84    0.290   324.31
1982.84    0.295   323.86
1983.84    0.300   323.42
1984.84    0.305   323.00
1985.84    0.310   322.59
1986.84    0.315   322.20
1987.84    0.319   321.81
1988.84    0.324   321.44
1989.84    0.329   321.08
1990.84    0.333   320.73
1991.84    0.338   320.38
1992.84    0.342   320.05
1993.84    0.346   319.72
1994.84    0.350   319.41
1995.84    0.354   319.10
1996.84    0.358   318.79
1997.84    0.362   318.50
1998.84    0.366   318.21
1999.84    0.370   317.92
2000.84    0.374   317.64
2001.84    0.377   317.37
2002.84    0.381   317.10
2003.84    0.384   316.84
2004.84    0.388   316.58
2005.84    0.391   316.33
2006.84    0.395   316.08
2007.84    0.398   315.83
2008.84    0.401   315.59
2009.84    0.404   315.35
2010.84    0.407   315.12
2011.84    0.410   314.89
2012.84    0.413   314.66
2013.84    0.415   314.44
2014.84    0.418   314.21
2015.84    0.421   314.00
2016.84    0.423   313.78
2017.84    0.426   313.57
2018.84    0.428   313.35
2019.84    0.430   313.14
2020.84    0.433   312.94
2021.84    0.435   312.73
2022.84    0.437   312.53
2023.84    0.439   312.33
2024.84    0.441   312.13
2025.84    0.443   311.93
2026.84    0.445   311.74
2027.84    0.447   311.55
2028.84    0.448   311.35
2029.84    0.450   311.16
2030.84    0.452   310.97
2031.84    0.453   310.78
2032.84    0.455   310.60
2033.84    0.456   310.41
2034.84    0.457   310.23
2035.84    0.459   310.04
2036.84    0.460   309.86
2037.84    0.461   309.68
2038.84    0.462   309.50
2039.84    0.463   309.32
2040.84    0.464   309.14
2041.84    0.465   308.96
2042.84    0.465   308.78
2043.84    0.466   308.60
2044.84    0.467   308.43
2045.84    0.467   308.25
2046.84    0.468   308.07
2047.84    0.468   307.90
2048.84    0.469   307.72
2049.84    0.469   307.55
2050.84    0.469   307.37
2051.84    0.469   307.20
2052.84    0.469   307.02
2053.84    0.469   306.85
2054.84    0.469   306.67
2055.84    0.469   306.50
2056.84    0.469   306.32
2057.84    0.468   306.15
2058.84    0.468   305.97
2059.84    0.468   305.80
2060.84    0.467   305.62
2061.84    0.467   305.44
2062.84    0.466   305.27
2063.84    0.465   305.09
2064.84    0.464   304.91
2065.84    0.463   304.73
2066.84    0.463   304.55
2067.84    0.461   304.37
2068.84    0.460   304.19
2069.84    0.459   304.01
2070.84    0.458   303.82
2071.84    0.457   303.64
2072.84    0.455   303.45
2073.84    0.454   303.27
2074.84    0.452   303.08
2075.84    0.450   302.89
2076.84    0.449   302.70
2077.84    0.447   302.51
2078.84    0.445   302.31
2079.84    0.443   302.12
2080.84    0.441   301.92
2081.84    0.438   301.72
2082.84    0.436   301.52
2083.84    0.434   301.32
2084.84    0.431   301.11
2085.84    0.429   300.90
2086.84    0.426   300.69
2087.84    0.423   300.48
2088.84    0.420   300.26
2089.84    0.418   300.04
2090.84    0.415   299.82
2091.84    0.411   299.59
2092.84    0.408   299.36
2093.84    0.405   299.13
2094.84    0.401   298.89
2095.84    0.398   298.65
2096.84    0.394   298.41
2097.84    0.390   298.16
2098.84    0.386   297.90
2099.84    0.382   297.64
2100.84    0.378   297.37
2101.84    0.374   297.10
2102.84    0.370   296.82
2103.84    0.365   296.54
2104.84    0.360   296.24
2105.84    0.356   295.94
2106.84    0.351   295.64
2107.84    0.346   295.32
2108.84    0.341   294.99
2109.84    0.335   294.65
2110.84    0.330   294.31
2111.84    0.324   293.95
2112.84    0.318   293.57
2113.84    0.312   293.18
2114.84    0.306   292.78
2115.84    0.300   292.36
2116.84    0.293   291.93
2117.84    0.287   291.47
2118.84    0.280   290.99
2119.84    0.273   290.48
2120.84    0.266   289.95
2121.84    0.258   289.39
2122.84    0.251   288.80
2123.84    0.243   288.16
2124.84    0.234   287.49
2125.84    0.226   286.76
2126.84    0.217   285.97
2127.84    0.208   285.12
2128.84    0.199   284.19

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 15:53:02