Double Star Calculator - Orbit

Orbital Elements for BU208AB

WDS:	BU208AB	WDS ID/Discoverer
P:	127.340	Orbital period (years)
a:	1.665	Semi-major axis (arcseconds)
i:	83.6	Inclination (degrees)
Ω:	31.3	Longitude of ascending node (degrees)
T:	1986.200	Epoch of periastron passage (year)
e:	0.298	Eccentricity
ω:	305.0	Longitude of periastron (degrees)
Start-Year:	1961.33	Year
End-Year:	2088.67	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU208AB
Position:	083907.90-223942.8	Epoch-2000 right ascension and declination
WDS-ID:	08391-2240	WDS designation
Discoverer Code:	BU208AB	Discover designation and components
ADS number:	6914	Aitken Double Star catalog
HD number:	73752	HD catalog number
Hipparcos number:	42430	Hipparcos catalog number
V1:	5.37	Magnitude of the primary
V2:	6.81	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:	Tok2021f	Reference

Double Star Orbit for BU208AB

WDS 6th Orbit including measures of BU208AB

-- 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 BU208AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.275    83.83
--------------------------
1961.33    1.543   213.65
1962.33    1.490   214.01
1963.33    1.434   214.40
1964.33    1.374   214.82
1965.33    1.310   215.29
1966.33    1.242   215.80
1967.33    1.170   216.37
1968.33    1.094   217.02
1969.33    1.015   217.77
1970.33    0.932   218.66
1971.33    0.845   219.71
1972.33    0.755   221.02
1973.33    0.663   222.68
1974.33    0.568   224.90
1975.33    0.472   228.01
1976.33    0.375   232.73
1977.33    0.280   240.69
1978.33    0.195   256.14
1979.33    0.140   288.37
1980.33    0.154   330.67
1981.33    0.225   355.41
1982.33    0.315     7.25
1983.33    0.410    13.71
1984.33    0.506    17.73
1985.33    0.600    20.47
1986.33    0.690    22.49
1987.33    0.777    24.04
1988.33    0.858    25.29
1989.33    0.934    26.33
1990.33    1.004    27.22
1991.33    1.067    27.99
1992.33    1.124    28.69
1993.33    1.173    29.32
1994.33    1.216    29.90
1995.33    1.252    30.45
1996.33    1.280    30.97
1997.33    1.303    31.47
1998.33    1.318    31.95
1999.33    1.327    32.43
2000.33    1.331    32.90
2001.33    1.328    33.37
2002.33    1.320    33.85
2003.33    1.307    34.33
2004.33    1.290    34.83
2005.33    1.267    35.34
2006.33    1.241    35.87
2007.33    1.211    36.42
2008.33    1.177    37.01
2009.33    1.140    37.63
2010.33    1.100    38.29
2011.33    1.058    39.01
2012.33    1.013    39.79
2013.33    0.965    40.64
2014.33    0.916    41.58
2015.33    0.865    42.64
2016.33    0.812    43.82
2017.33    0.758    45.18
2018.33    0.703    46.74
2019.33    0.648    48.57
2020.33    0.592    50.75
2021.33    0.536    53.38
2022.33    0.480    56.62
2023.33    0.426    60.71
2024.33    0.373    65.96
2025.33    0.325    72.85
2026.33    0.282    82.00
2027.33    0.248    94.02
2028.33    0.228   108.96
2029.33    0.225   125.48
2030.33    0.240   141.15
2031.33    0.270   154.15
2032.33    0.310   164.16
2033.33    0.358   171.70
2034.33    0.409   177.40
2035.33    0.463   181.81
2036.33    0.519   185.28
2037.33    0.576   188.07
2038.33    0.633   190.36
2039.33    0.690   192.27
2040.33    0.747   193.88
2041.33    0.804   195.27
2042.33    0.860   196.48
2043.33    0.915   197.54
2044.33    0.970   198.48
2045.33    1.024   199.32
2046.33    1.077   200.08
2047.33    1.129   200.76
2048.33    1.179   201.39
2049.33    1.229   201.96
2050.33    1.277   202.49
2051.33    1.324   202.99
2052.33    1.370   203.45
2053.33    1.414   203.88
2054.33    1.457   204.28
2055.33    1.498   204.66
2056.33    1.537   205.03
2057.33    1.575   205.37
2058.33    1.611   205.70
2059.33    1.645   206.01
2060.33    1.678   206.32
2061.33    1.708   206.61
2062.33    1.736   206.89
2063.33    1.763   207.16
2064.33    1.787   207.42
2065.33    1.809   207.68
2066.33    1.829   207.93
2067.33    1.847   208.18
2068.33    1.862   208.42
2069.33    1.875   208.66
2070.33    1.885   208.90
2071.33    1.892   209.13
2072.33    1.897   209.36
2073.33    1.900   209.60
2074.33    1.899   209.83
2075.33    1.896   210.06
2076.33    1.890   210.29
2077.33    1.881   210.53
2078.33    1.868   210.76
2079.33    1.853   211.00
2080.33    1.834   211.25
2081.33    1.812   211.50
2082.33    1.787   211.76
2083.33    1.758   212.02
2084.33    1.726   212.30
2085.33    1.690   212.58
2086.33    1.650   212.88
2087.33    1.607   213.20
2088.33    1.559   213.53

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 16:09:16