Double Star Calculator - Orbit

Orbital Elements for HU821

WDS:	HU821	WDS ID/Discoverer
P:	140.980	Orbital period (years)
a:	0.653	Semi-major axis (arcseconds)
i:	40.5	Inclination (degrees)
Ω:	53.9	Longitude of ascending node (degrees)
T:	1971.260	Epoch of periastron passage (year)
e:	0.616	Eccentricity
ω:	312.9	Longitude of periastron (degrees)
Start-Year:	1954.51	Year
End-Year:	2095.49	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HU821
Position:	051401.68+512551.8	Epoch-2000 right ascension and declination
WDS-ID:	05140+5126	WDS designation
Discoverer Code:	HU821	Discover designation and components
ADS number:	3780	Aitken Double Star catalog
HD number:	33580	HD catalog number
Hipparcos number:	24397	Hipparcos catalog number
V1:	7.43	Magnitude of the primary
V2:	9.94	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2012	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:	Doc2016c	Reference

Double Star Orbit for HU821

WDS 6th Orbit including measures of HU821

-- 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 HU821

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.846   182.08
--------------------------
1954.51    0.555   245.99
1955.51    0.532   248.20
1956.51    0.507   250.62
1957.51    0.482   253.28
1958.51    0.456   256.25
1959.51    0.428   259.59
1960.51    0.400   263.39
1961.51    0.372   267.78
1962.51    0.343   272.90
1963.51    0.313   278.97
1964.51    0.285   286.27
1965.51    0.258   295.14
1966.51    0.235   305.90
1967.51    0.217   318.73
1968.51    0.207   333.37
1969.51    0.205   348.91
1970.51    0.211     4.08
1971.51    0.224    17.90
1972.51    0.241    30.00
1973.51    0.259    40.46
1974.51    0.277    49.56
1975.51    0.293    57.60
1976.51    0.309    64.80
1977.51    0.323    71.33
1978.51    0.336    77.33
1979.51    0.349    82.89
1980.51    0.361    88.07
1981.51    0.373    92.92
1982.51    0.384    97.48
1983.51    0.395   101.77
1984.51    0.407   105.83
1985.51    0.418   109.67
1986.51    0.429   113.30
1987.51    0.441   116.75
1988.51    0.452   120.02
1989.51    0.464   123.13
1990.51    0.476   126.09
1991.51    0.487   128.90
1992.51    0.499   131.58
1993.51    0.511   134.14
1994.51    0.523   136.59
1995.51    0.534   138.92
1996.51    0.546   141.16
1997.51    0.558   143.30
1998.51    0.570   145.35
1999.51    0.582   147.31
2000.51    0.593   149.20
2001.51    0.605   151.02
2002.51    0.616   152.77
2003.51    0.628   154.46
2004.51    0.639   156.08
2005.51    0.650   157.65
2006.51    0.661   159.17
2007.51    0.672   160.64
2008.51    0.683   162.06
2009.51    0.694   163.44
2010.51    0.704   164.77
2011.51    0.714   166.07
2012.51    0.725   167.33
2013.51    0.735   168.55
2014.51    0.744   169.75
2015.51    0.754   170.91
2016.51    0.763   172.04
2017.51    0.773   173.15
2018.51    0.782   174.23
2019.51    0.790   175.28
2020.51    0.799   176.32
2021.51    0.808   177.33
2022.51    0.816   178.32
2023.51    0.824   179.29
2024.51    0.832   180.24
2025.51    0.839   181.17
2026.51    0.846   182.09
2027.51    0.854   182.99
2028.51    0.860   183.88
2029.51    0.867   184.76
2030.51    0.873   185.62
2031.51    0.880   186.47
2032.51    0.886   187.30
2033.51    0.891   188.13
2034.51    0.897   188.95
2035.51    0.902   189.75
2036.51    0.907   190.55
2037.51    0.911   191.34
2038.51    0.916   192.12
2039.51    0.920   192.90
2040.51    0.924   193.66
2041.51    0.927   194.42
2042.51    0.931   195.18
2043.51    0.934   195.93
2044.51    0.936   196.68
2045.51    0.939   197.42
2046.51    0.941   198.16
2047.51    0.943   198.89
2048.51    0.945   199.62
2049.51    0.946   200.35
2050.51    0.947   201.08
2051.51    0.948   201.81
2052.51    0.948   202.53
2053.51    0.948   203.26
2054.51    0.948   203.99
2055.51    0.947   204.71
2056.51    0.946   205.44
2057.51    0.945   206.17
2058.51    0.943   206.90
2059.51    0.941   207.63
2060.51    0.939   208.37
2061.51    0.937   209.11
2062.51    0.933   209.86
2063.51    0.930   210.61
2064.51    0.926   211.37
2065.51    0.922   212.13
2066.51    0.917   212.90
2067.51    0.912   213.68
2068.51    0.907   214.47
2069.51    0.901   215.27
2070.51    0.895   216.08
2071.51    0.888   216.90
2072.51    0.881   217.73
2073.51    0.873   218.58
2074.51    0.865   219.44
2075.51    0.857   220.32
2076.51    0.848   221.22
2077.51    0.838   222.14
2078.51    0.828   223.08
2079.51    0.817   224.04
2080.51    0.806   225.03
2081.51    0.794   226.05
2082.51    0.782   227.10
2083.51    0.768   228.19
2084.51    0.755   229.31
2085.51    0.740   230.48
2086.51    0.725   231.69
2087.51    0.710   232.96
2088.51    0.693   234.29
2089.51    0.676   235.68
2090.51    0.658   237.14
2091.51    0.639   238.70
2092.51    0.619   240.35
2093.51    0.598   242.11
2094.51    0.577   243.99

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 15:35:14