Double Star Calculator - Orbit

Orbital Elements for HU731

WDS:	HU731	WDS ID/Discoverer
P:	207.770	Orbital period (years)
a:	1.179	Semi-major axis (arcseconds)
i:	96.6	Inclination (degrees)
Ω:	118.7	Longitude of ascending node (degrees)
T:	1900.830	Epoch of periastron passage (year)
e:	0.705	Eccentricity
ω:	301.1	Longitude of periastron (degrees)
Start-Year:	1921.115	Year
End-Year:	2128.885	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HU731
Position:	115157.86+480519.5	Epoch-2000 right ascension and declination
WDS-ID:	11520+4805	WDS designation
Discoverer Code:	HU731	Discover designation and components
ADS number:	8325	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	57859	Hipparcos catalog number
V1:	9.81	Magnitude of the primary
V2:	9.68	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2003	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:	Hrt2008	Reference

Double Star Orbit for HU731

WDS 6th Orbit including measures of HU731

-- 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 HU731

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.276   306.36
--------------------------
1921.12    0.438   105.84
1922.12    0.425   104.78
1923.12    0.411   103.66
1924.12    0.396   102.45
1925.12    0.381   101.15
1926.12    0.366    99.75
1927.12    0.351    98.22
1928.12    0.336    96.56
1929.12    0.321    94.73
1930.12    0.305    92.73
1931.12    0.290    90.51
1932.12    0.275    88.06
1933.12    0.261    85.32
1934.12    0.247    82.27
1935.12    0.233    78.86
1936.12    0.221    75.04
1937.12    0.209    70.78
1938.12    0.198    66.04
1939.12    0.189    60.81
1940.12    0.182    55.09
1941.12    0.176    48.94
1942.12    0.172    42.46
1943.12    0.171    35.79
1944.12    0.172    29.09
1945.12    0.175    22.55
1946.12    0.180    16.30
1947.12    0.187    10.47
1948.12    0.196     5.12
1949.12    0.206     0.26
1950.12    0.218   355.89
1951.12    0.231   351.98
1952.12    0.244   348.49
1953.12    0.258   345.37
1954.12    0.273   342.59
1955.12    0.288   340.10
1956.12    0.304   337.86
1957.12    0.320   335.84
1958.12    0.336   334.02
1959.12    0.353   332.37
1960.12    0.370   330.86
1961.12    0.386   329.49
1962.12    0.403   328.23
1963.12    0.420   327.07
1964.12    0.437   326.00
1965.12    0.454   325.02
1966.12    0.471   324.10
1967.12    0.488   323.25
1968.12    0.505   322.45
1969.12    0.522   321.71
1970.12    0.539   321.01
1971.12    0.556   320.36
1972.12    0.573   319.74
1973.12    0.590   319.16
1974.12    0.607   318.61
1975.12    0.623   318.09
1976.12    0.640   317.60
1977.12    0.656   317.13
1978.12    0.672   316.69
1979.12    0.689   316.26
1980.12    0.705   315.86
1981.12    0.721   315.47
1982.12    0.737   315.10
1983.12    0.752   314.75
1984.12    0.768   314.41
1985.12    0.783   314.08
1986.12    0.799   313.77
1987.12    0.814   313.47
1988.12    0.829   313.18
1989.12    0.844   312.90
1990.12    0.859   312.63
1991.12    0.874   312.36
1992.12    0.888   312.11
1993.12    0.902   311.87
1994.12    0.917   311.63
1995.12    0.931   311.40
1996.12    0.945   311.17
1997.12    0.958   310.96
1998.12    0.972   310.75
1999.12    0.985   310.54
2000.12    0.998   310.34
2001.12    1.012   310.15
2002.12    1.024   309.96
2003.12    1.037   309.77
2004.12    1.050   309.59
2005.12    1.062   309.42
2006.12    1.074   309.25
2007.12    1.086   309.08
2008.12    1.098   308.91
2009.12    1.109   308.75
2010.12    1.121   308.59
2011.12    1.132   308.44
2012.12    1.143   308.29
2013.12    1.154   308.14
2014.12    1.164   307.99
2015.12    1.175   307.85
2016.12    1.185   307.71
2017.12    1.195   307.57
2018.12    1.204   307.43
2019.12    1.214   307.30
2020.12    1.223   307.17
2021.12    1.232   307.03
2022.12    1.241   306.91
2023.12    1.249   306.78
2024.12    1.258   306.65
2025.12    1.266   306.53
2026.12    1.273   306.41
2027.12    1.281   306.29
2028.12    1.288   306.17
2029.12    1.295   306.05
2030.12    1.302   305.94
2031.12    1.309   305.82
2032.12    1.315   305.71
2033.12    1.321   305.59
2034.12    1.327   305.48
2035.12    1.332   305.37
2036.12    1.337   305.26
2037.12    1.342   305.15
2038.12    1.346   305.04
2039.12    1.351   304.93
2040.12    1.354   304.83
2041.12    1.358   304.72
2042.12    1.361   304.61
2043.12    1.364   304.51
2044.12    1.367   304.40
2045.12    1.369   304.30
2046.12    1.371   304.19
2047.12    1.372   304.09
2048.11    1.373   303.99
2049.11    1.374   303.88
2050.11    1.374   303.78
2051.11    1.374   303.67
2052.11    1.374   303.57
2053.11    1.373   303.47
2054.11    1.372   303.36
2055.11    1.370   303.26
2056.11    1.368   303.15
2057.11    1.366   303.05
2058.11    1.362   302.94
2059.11    1.359   302.84
2060.11    1.355   302.73
2061.11    1.350   302.62
2062.11    1.345   302.51
2063.11    1.340   302.40
2064.11    1.334   302.29
2065.11    1.327   302.18
2066.11    1.320   302.07
2067.11    1.312   301.96
2068.11    1.303   301.84
2069.11    1.294   301.73
2070.11    1.284   301.61
2071.11    1.274   301.49
2072.11    1.263   301.37
2073.11    1.251   301.24
2074.11    1.238   301.12
2075.11    1.224   300.99
2076.11    1.210   300.85
2077.11    1.195   300.72
2078.11    1.178   300.58
2079.11    1.161   300.43
2080.11    1.143   300.29
2081.11    1.124   300.13
2082.11    1.104   299.98
2083.11    1.082   299.81
2084.11    1.059   299.64
2085.11    1.036   299.46
2086.11    1.010   299.27
2087.11    0.983   299.08
2088.11    0.955   298.87
2089.11    0.925   298.65
2090.11    0.894   298.41
2091.11    0.860   298.15
2092.11    0.825   297.88
2093.11    0.787   297.57
2094.11    0.747   297.24
2095.11    0.705   296.87
2096.11    0.660   296.44
2097.11    0.612   295.96
2098.11    0.561   295.39
2099.11    0.506   294.69
2100.11    0.448   293.83
2101.11    0.386   292.70
2102.11    0.321   291.12
2103.11    0.251   288.69
2104.11    0.179   284.32
2105.11    0.105   273.84
2106.11    0.046   228.30
2107.11    0.077   150.49
2108.11    0.148   133.00
2109.11    0.219   126.96
2110.11    0.283   123.81
2111.11    0.339   121.78
2112.11    0.386   120.29
2113.11    0.423   119.09
2114.11    0.453   118.06
2115.11    0.475   117.15
2116.11    0.491   116.31
2117.11    0.502   115.52
2118.11    0.509   114.75
2119.11    0.512   114.00
2120.11    0.512   113.25
2121.11    0.510   112.50
2122.11    0.505   111.74
2123.11    0.499   110.96
2124.11    0.491   110.16
2125.11    0.482   109.33
2126.11    0.472   108.47
2127.11    0.460   107.56
2128.11    0.448   106.61

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 16:42:00