Double Star Calculator - Orbit

Orbital Elements for BU28AB

WDS:	BU28AB	WDS ID/Discoverer
P:	150.940	Orbital period (years)
a:	1.395	Semi-major axis (arcseconds)
i:	29.9	Inclination (degrees)
Ω:	112.8	Longitude of ascending node (degrees)
T:	1946.090	Epoch of periastron passage (year)
e:	0.702	Eccentricity
ω:	60.9	Longitude of periastron (degrees)
Start-Year:	1949.53	Year
End-Year:	2100.47	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU28AB
Position:	123004.77-132335.5	Epoch-2000 right ascension and declination
WDS-ID:	12301-1324	WDS designation
Discoverer Code:	BU28AB	Discover designation and components
ADS number:	8573	Aitken Double Star catalog
HD number:	108799	HD catalog number
Hipparcos number:	60994	Hipparcos catalog number
V1:	6.49	Magnitude of the primary
V2:	9.58	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2016	Date of last observation
Orbit grade:	3	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	USN2017b	Reference

Double Star Orbit for BU28AB

WDS 6th Orbit including measures of BU28AB

-- 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 BU28AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    2.117   353.22
--------------------------
1949.53    0.459   234.12
1950.53    0.519   246.18
1951.53    0.583   255.66
1952.53    0.648   263.24
1953.53    0.713   269.44
1954.53    0.776   274.62
1955.53    0.836   279.04
1956.53    0.895   282.87
1957.53    0.951   286.23
1958.53    1.005   289.23
1959.53    1.057   291.93
1960.53    1.107   294.38
1961.53    1.154   296.62
1962.53    1.200   298.69
1963.53    1.244   300.60
1964.53    1.286   302.39
1965.53    1.327   304.07
1966.53    1.366   305.65
1967.53    1.404   307.15
1968.53    1.440   308.56
1969.53    1.475   309.91
1970.53    1.509   311.20
1971.53    1.541   312.43
1972.53    1.572   313.62
1973.53    1.602   314.75
1974.53    1.631   315.85
1975.53    1.659   316.91
1976.53    1.686   317.94
1977.53    1.711   318.93
1978.53    1.736   319.89
1979.53    1.760   320.83
1980.53    1.783   321.74
1981.53    1.805   322.63
1982.53    1.826   323.50
1983.53    1.847   324.35
1984.53    1.866   325.18
1985.53    1.885   326.00
1986.53    1.903   326.80
1987.53    1.921   327.58
1988.53    1.937   328.35
1989.53    1.953   329.11
1990.53    1.968   329.85
1991.53    1.982   330.59
1992.53    1.996   331.31
1993.53    2.009   332.03
1994.53    2.022   332.73
1995.53    2.033   333.43
1996.53    2.045   334.12
1997.53    2.055   334.80
1998.53    2.065   335.47
1999.53    2.074   336.14
2000.53    2.083   336.81
2001.53    2.091   337.46
2002.53    2.098   338.12
2003.53    2.105   338.77
2004.53    2.112   339.41
2005.53    2.117   340.05
2006.53    2.123   340.69
2007.53    2.127   341.32
2008.53    2.131   341.96
2009.53    2.135   342.59
2010.53    2.138   343.21
2011.53    2.141   343.84
2012.53    2.142   344.46
2013.53    2.144   345.09
2014.53    2.145   345.71
2015.53    2.145   346.33
2016.53    2.145   346.96
2017.53    2.145   347.58
2018.53    2.144   348.20
2019.53    2.142   348.83
2020.53    2.140   349.45
2021.53    2.137   350.08
2022.53    2.134   350.71
2023.53    2.131   351.34
2024.53    2.127   351.97
2025.53    2.122   352.60
2026.53    2.117   353.24
2027.53    2.111   353.88
2028.53    2.105   354.53
2029.53    2.099   355.18
2030.53    2.092   355.83
2031.53    2.084   356.49
2032.53    2.077   357.15
2033.53    2.068   357.82
2034.53    2.059   358.49
2035.53    2.050   359.17
2036.53    2.040   359.85
2037.53    2.029     0.54
2038.53    2.019     1.24
2039.53    2.007     1.95
2040.53    1.995     2.67
2041.53    1.983     3.39
2042.53    1.970     4.12
2043.53    1.957     4.87
2044.53    1.943     5.62
2045.53    1.929     6.39
2046.53    1.914     7.16
2047.53    1.899     7.95
2048.53    1.883     8.75
2049.53    1.867     9.57
2050.53    1.850    10.40
2051.53    1.832    11.24
2052.53    1.814    12.10
2053.53    1.796    12.98
2054.53    1.777    13.88
2055.53    1.758    14.80
2056.53    1.738    15.74
2057.53    1.717    16.70
2058.53    1.696    17.68
2059.53    1.674    18.69
2060.53    1.652    19.73
2061.53    1.629    20.79
2062.53    1.606    21.89
2063.53    1.582    23.01
2064.53    1.557    24.18
2065.53    1.532    25.38
2066.53    1.507    26.62
2067.53    1.480    27.90
2068.53    1.453    29.24
2069.53    1.426    30.62
2070.53    1.397    32.06
2071.53    1.368    33.56
2072.53    1.339    35.12
2073.53    1.308    36.76
2074.53    1.277    38.47
2075.53    1.245    40.27
2076.53    1.213    42.17
2077.53    1.180    44.17
2078.53    1.145    46.29
2079.53    1.110    48.55
2080.53    1.075    50.95
2081.53    1.038    53.51
2082.53    1.001    56.27
2083.53    0.962    59.25
2084.53    0.923    62.48
2085.53    0.882    66.00
2086.53    0.840    69.86
2087.53    0.798    74.14
2088.53    0.754    78.91
2089.53    0.708    84.27
2090.53    0.661    90.39
2091.53    0.613    97.45
2092.53    0.564   105.72
2093.53    0.514   115.60
2094.53    0.465   127.59
2095.53    0.420   142.30
2096.53    0.385   160.13
2097.53    0.369   180.50
2098.53    0.378   201.26
2099.53    0.412   219.81

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 16:47:00