Double Star Calculator - Orbit

Orbital Elements for I974AA,AB

WDS:	I974AA,AB	WDS ID/Discoverer
P:	210.700	Orbital period (years)
a:	0.435	Semi-major axis (arcseconds)
i:	79.8	Inclination (degrees)
Ω:	5.2	Longitude of ascending node (degrees)
T:	1980.000	Epoch of periastron passage (year)
e:	0.73	Eccentricity
ω:	199.1	Longitude of periastron (degrees)
Start-Year:	1919.65	Year
End-Year:	2130.35	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for I974AA,AB
Position:	154650.97-580730.5	Epoch-2000 right ascension and declination
WDS-ID:	15468-5808	WDS designation
Discoverer Code:	I974AA,AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	140504	HD catalog number
Hipparcos number:	77294	Hipparcos catalog number
V1:	7.42	Magnitude of the primary
V2:	7.93	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2020	Date of last observation
Orbit grade:	4	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 I974AA,AB

WDS 6th Orbit including measures of I974AA,AB

-- 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 I974AA,AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.572     3.73
--------------------------
1919.65    0.517    13.18
1920.65    0.510    13.33
1921.65    0.503    13.48
1922.65    0.495    13.64
1923.65    0.488    13.80
1924.65    0.480    13.97
1925.65    0.472    14.14
1926.65    0.464    14.32
1927.65    0.456    14.51
1928.65    0.448    14.70
1929.65    0.439    14.90
1930.65    0.431    15.11
1931.65    0.422    15.32
1932.65    0.413    15.55
1933.65    0.404    15.78
1934.65    0.395    16.03
1935.65    0.385    16.28
1936.65    0.376    16.55
1937.65    0.366    16.84
1938.65    0.357    17.14
1939.65    0.347    17.45
1940.65    0.337    17.79
1941.65    0.326    18.14
1942.65    0.316    18.52
1943.65    0.306    18.93
1944.65    0.295    19.36
1945.65    0.284    19.83
1946.65    0.273    20.33
1947.65    0.262    20.88
1948.65    0.251    21.48
1949.65    0.239    22.13
1950.65    0.228    22.85
1951.65    0.216    23.64
1952.65    0.204    24.53
1953.65    0.192    25.53
1954.65    0.180    26.67
1955.65    0.167    27.97
1956.65    0.155    29.48
1957.65    0.143    31.25
1958.65    0.130    33.36
1959.65    0.118    35.92
1960.65    0.105    39.09
1961.65    0.093    43.08
1962.65    0.081    48.26
1963.65    0.070    55.13
1964.65    0.060    64.39
1965.65    0.052    76.83
1966.65    0.048    92.66
1967.65    0.047   110.45
1968.65    0.050   127.26
1969.65    0.057   140.99
1970.65    0.066   151.39
1971.65    0.076   159.17
1972.65    0.087   165.08
1973.65    0.097   169.72
1974.65    0.106   173.50
1975.65    0.114   176.71
1976.65    0.120   179.55
1977.65    0.122   182.20
1978.65    0.121   184.83
1979.65    0.115   187.63
1980.65    0.103   190.91
1981.65    0.088   195.17
1982.65    0.070   201.44
1983.65    0.051   212.25
1984.65    0.035   234.37
1985.65    0.029   276.23
1986.65    0.039   312.76
1987.65    0.057   330.32
1988.65    0.078   339.11
1989.65    0.098   344.23
1990.65    0.119   347.57
1991.65    0.139   349.94
1992.65    0.159   351.71
1993.65    0.178   353.10
1994.65    0.196   354.22
1995.65    0.214   355.15
1996.65    0.232   355.94
1997.65    0.248   356.62
1998.65    0.265   357.22
1999.65    0.281   357.74
2000.65    0.296   358.21
2001.65    0.311   358.64
2002.65    0.325   359.03
2003.65    0.340   359.38
2004.65    0.353   359.71
2005.65    0.366     0.01
2006.65    0.379     0.29
2007.65    0.392     0.55
2008.65    0.404     0.80
2009.65    0.416     1.03
2010.65    0.427     1.25
2011.65    0.439     1.46
2012.65    0.449     1.66
2013.65    0.460     1.85
2014.65    0.470     2.03
2015.65    0.480     2.20
2016.65    0.490     2.37
2017.65    0.499     2.53
2018.65    0.509     2.68
2019.65    0.518     2.83
2020.65    0.526     2.98
2021.65    0.535     3.11
2022.65    0.543     3.25
2023.65    0.551     3.38
2024.65    0.559     3.51
2025.65    0.566     3.63
2026.65    0.573     3.75
2027.65    0.581     3.87
2028.65    0.587     3.98
2029.65    0.594     4.10
2030.65    0.601     4.21
2031.65    0.607     4.31
2032.65    0.613     4.42
2033.65    0.619     4.52
2034.65    0.624     4.62
2035.65    0.630     4.72
2036.65    0.635     4.82
2037.65    0.640     4.92
2038.65    0.645     5.01
2039.65    0.650     5.10
2040.65    0.655     5.20
2041.65    0.659     5.29
2042.65    0.664     5.38
2043.65    0.668     5.46
2044.65    0.672     5.55
2045.65    0.675     5.64
2046.65    0.679     5.72
2047.65    0.683     5.81
2048.65    0.686     5.89
2049.65    0.689     5.97
2050.65    0.692     6.06
2051.65    0.695     6.14
2052.65    0.698     6.22
2053.65    0.700     6.30
2054.65    0.703     6.38
2055.65    0.705     6.46
2056.65    0.707     6.53
2057.65    0.709     6.61
2058.65    0.711     6.69
2059.65    0.713     6.77
2060.65    0.714     6.84
2061.65    0.716     6.92
2062.65    0.717     7.00
2063.65    0.718     7.07
2064.65    0.719     7.15
2065.65    0.720     7.22
2066.65    0.721     7.30
2067.65    0.722     7.37
2068.65    0.722     7.45
2069.65    0.723     7.52
2070.65    0.723     7.60
2071.65    0.723     7.67
2072.65    0.723     7.75
2073.65    0.723     7.82
2074.65    0.723     7.90
2075.65    0.722     7.97
2076.65    0.722     8.05
2077.65    0.721     8.12
2078.65    0.721     8.20
2079.65    0.720     8.27
2080.65    0.719     8.35
2081.65    0.718     8.43
2082.65    0.716     8.50
2083.65    0.715     8.58
2084.65    0.714     8.66
2085.65    0.712     8.73
2086.65    0.710     8.81
2087.65    0.708     8.89
2088.65    0.706     8.97
2089.65    0.704     9.04
2090.65    0.702     9.12
2091.65    0.700     9.20
2092.65    0.697     9.28
2093.65    0.695     9.36
2094.65    0.692     9.45
2095.65    0.689     9.53
2096.65    0.686     9.61
2097.65    0.683     9.69
2098.65    0.680     9.78
2099.65    0.677     9.86
2100.65    0.674     9.95
2101.65    0.670    10.03
2102.65    0.666    10.12
2103.65    0.663    10.21
2104.65    0.659    10.30
2105.65    0.655    10.39
2106.65    0.651    10.48
2107.65    0.646    10.58
2108.65    0.642    10.67
2109.65    0.638    10.77
2110.65    0.633    10.86
2111.65    0.628    10.96
2112.65    0.624    11.06
2113.65    0.619    11.16
2114.65    0.613    11.27
2115.65    0.608    11.37
2116.65    0.603    11.48
2117.65    0.597    11.59
2118.65    0.592    11.70
2119.65    0.586    11.81
2120.65    0.580    11.92
2121.65    0.574    12.04
2122.65    0.568    12.16
2123.65    0.562    12.28
2124.65    0.556    12.41
2125.65    0.549    12.54
2126.65    0.543    12.67
2127.65    0.536    12.80
2128.65    0.529    12.94
2129.65    0.522    13.08

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 17:19:42