Double Star Calculator - Orbit

Orbital Elements for BU367AB

WDS:	BU367AB	WDS ID/Discoverer
P:	104.020	Orbital period (years)
a:	0.41	Semi-major axis (arcseconds)
i:	68.2	Inclination (degrees)
Ω:	119.9	Longitude of ascending node (degrees)
T:	1934.610	Epoch of periastron passage (year)
e:	0.277	Eccentricity
ω:	185.8	Longitude of periastron (degrees)
Start-Year:	1972.99	Year
End-Year:	2077.01	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU367AB
Position:	205502.41+280525.6	Epoch-2000 right ascension and declination
WDS-ID:	20550+2805	WDS designation
Discoverer Code:	BU367AB	Discover designation and components
ADS number:	14424	Aitken Double Star catalog
HD number:	199221	HD catalog number
Hipparcos number:	103247	Hipparcos catalog number
V1:	8.31	Magnitude of the primary
V2:	9.00	Magnitude of the secondary
Equinox:		Equinox
Date:	2021	Date of last observation
Orbit grade:	2	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Sca2021b	Reference

Double Star Orbit for BU367AB

WDS 6th Orbit including measures of BU367AB

-- 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 BU367AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.192   263.19
--------------------------
1972.99    0.466   111.00
1973.99    0.476   111.94
1974.99    0.484   112.84
1975.99    0.492   113.71
1976.99    0.498   114.56
1977.99    0.504   115.38
1978.99    0.510   116.19
1979.99    0.514   116.98
1980.99    0.517   117.76
1981.99    0.520   118.53
1982.99    0.522   119.30
1983.99    0.523   120.06
1984.99    0.523   120.82
1985.99    0.522   121.58
1986.99    0.521   122.34
1987.99    0.518   123.11
1988.99    0.515   123.89
1989.99    0.511   124.68
1990.99    0.506   125.48
1991.99    0.501   126.30
1992.99    0.494   127.14
1993.99    0.487   128.00
1994.99    0.479   128.89
1995.99    0.471   129.81
1996.99    0.461   130.76
1997.99    0.451   131.76
1998.99    0.440   132.80
1999.99    0.429   133.90
2000.99    0.416   135.07
2001.99    0.403   136.30
2002.99    0.390   137.62
2003.99    0.376   139.04
2004.99    0.361   140.57
2005.99    0.345   142.24
2006.99    0.330   144.06
2007.99    0.313   146.07
2008.99    0.297   148.30
2009.99    0.280   150.80
2010.99    0.263   153.62
2011.99    0.246   156.83
2012.99    0.229   160.52
2013.99    0.213   164.78
2014.99    0.197   169.73
2015.99    0.182   175.51
2016.99    0.169   182.24
2017.99    0.158   190.00
2018.99    0.150   198.76
2019.99    0.145   208.33
2020.99    0.144   218.33
2021.99    0.146   228.26
2022.99    0.152   237.63
2023.99    0.161   246.15
2024.99    0.172   253.66
2025.99    0.185   260.20
2026.99    0.199   265.86
2027.99    0.213   270.77
2028.99    0.227   275.07
2029.99    0.241   278.87
2030.99    0.253   282.28
2031.99    0.265   285.37
2032.99    0.275   288.21
2033.99    0.284   290.87
2034.99    0.290   293.39
2035.99    0.295   295.81
2036.99    0.297   298.19
2037.99    0.296   300.54
2038.99    0.294   302.92
2039.99    0.289   305.36
2040.99    0.282   307.90
2041.99    0.273   310.60
2042.99    0.262   313.50
2043.99    0.249   316.68
2044.99    0.235   320.22
2045.99    0.220   324.22
2046.99    0.205   328.81
2047.99    0.190   334.15
2048.99    0.175   340.42
2049.99    0.161   347.81
2050.99    0.150   356.43
2051.99    0.141     6.28
2052.99    0.137    17.08
2053.99    0.136    28.28
2054.99    0.141    39.16
2055.99    0.149    49.13
2056.99    0.160    57.86
2057.99    0.174    65.30
2058.99    0.190    71.58
2059.99    0.207    76.86
2060.99    0.225    81.32
2061.99    0.243    85.12
2062.99    0.261    88.39
2063.99    0.279    91.24
2064.99    0.297    93.74
2065.99    0.315    95.96
2066.99    0.332    97.95
2067.99    0.348    99.75
2068.99    0.364   101.38
2069.99    0.379   102.89
2070.99    0.394   104.27
2071.99    0.408   105.57
2072.99    0.421   106.77
2073.99    0.434   107.91
2074.99    0.445   108.98
2075.99    0.456   110.01
2076.99    0.466   110.98

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 18:20:00