Double Star Calculator - Orbit

Orbital Elements for BU1000AB,C

WDS:	BU1000AB,C	WDS ID/Discoverer
P:	120.880	Orbital period (years)
a:	1.571	Semi-major axis (arcseconds)
i:	36.5	Inclination (degrees)
Ω:	132.5	Longitude of ascending node (degrees)
T:	1955.240	Epoch of periastron passage (year)
e:	0.23	Eccentricity
ω:	54.3	Longitude of periastron (degrees)
Start-Year:	1964.56	Year
End-Year:	2085.44	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU1000AB,C
Position:	013500.96-295438.0	Epoch-2000 right ascension and declination
WDS-ID:	01350-2955	WDS designation
Discoverer Code:	BU1000AB,C	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	9770	HD catalog number
Hipparcos number:	7372	Hipparcos catalog number
V1:	7.2	Magnitude of the primary
V2:	11.5	Magnitude of the secondary
Equinox:		Equinox
Date:		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:	Tok2021b	Reference

Double Star Orbit for BU1000AB,C

WDS 6th Orbit including measures of BU1000AB,C

-- 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 BU1000AB,C

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.550    24.43
--------------------------
1964.56    1.032   232.69
1965.56    1.051   238.00
1966.56    1.073   243.10
1967.56    1.098   247.98
1968.56    1.126   252.63
1969.56    1.157   257.04
1970.56    1.188   261.23
1971.56    1.221   265.19
1972.56    1.255   268.94
1973.56    1.289   272.49
1974.56    1.324   275.86
1975.56    1.358   279.06
1976.56    1.391   282.11
1977.56    1.424   285.01
1978.56    1.456   287.78
1979.56    1.487   290.44
1980.56    1.516   292.99
1981.56    1.545   295.44
1982.56    1.572   297.81
1983.56    1.598   300.10
1984.56    1.622   302.32
1985.56    1.644   304.47
1986.56    1.665   306.57
1987.56    1.685   308.62
1988.56    1.703   310.63
1989.56    1.719   312.59
1990.56    1.734   314.52
1991.56    1.747   316.42
1992.56    1.759   318.29
1993.56    1.769   320.13
1994.56    1.778   321.96
1995.56    1.785   323.77
1996.56    1.791   325.57
1997.56    1.796   327.36
1998.56    1.799   329.14
1999.56    1.801   330.91
2000.56    1.801   332.68
2001.56    1.801   334.46
2002.56    1.799   336.23
2003.56    1.796   338.01
2004.56    1.792   339.80
2005.56    1.787   341.59
2006.56    1.781   343.40
2007.56    1.774   345.22
2008.56    1.767   347.05
2009.56    1.758   348.90
2010.56    1.749   350.77
2011.56    1.739   352.66
2012.56    1.728   354.57
2013.56    1.717   356.51
2014.56    1.706   358.47
2015.56    1.693     0.47
2016.56    1.681     2.49
2017.56    1.668     4.54
2018.56    1.655     6.62
2019.56    1.642     8.74
2020.56    1.628    10.89
2021.56    1.615    13.07
2022.56    1.601    15.30
2023.56    1.588    17.56
2024.56    1.575    19.86
2025.56    1.562    22.20
2026.56    1.549    24.57
2027.56    1.536    26.99
2028.56    1.524    29.44
2029.56    1.513    31.94
2030.56    1.502    34.47
2031.56    1.491    37.04
2032.56    1.481    39.64
2033.56    1.472    42.28
2034.56    1.463    44.95
2035.56    1.455    47.65
2036.56    1.447    50.39
2037.56    1.440    53.14
2038.56    1.434    55.93
2039.56    1.429    58.73
2040.56    1.424    61.56
2041.56    1.420    64.40
2042.56    1.417    67.26
2043.56    1.414    70.13
2044.56    1.412    73.01
2045.56    1.410    75.89
2046.56    1.408    78.79
2047.56    1.407    81.69
2048.56    1.406    84.60
2049.56    1.405    87.51
2050.56    1.404    90.43
2051.56    1.402    93.35
2052.56    1.401    96.28
2053.56    1.398    99.21
2054.56    1.396   102.16
2055.56    1.392   105.12
2056.56    1.388   108.09
2057.56    1.383   111.09
2058.56    1.376   114.11
2059.56    1.369   117.16
2060.56    1.360   120.25
2061.56    1.350   123.38
2062.56    1.338   126.57
2063.56    1.324   129.81
2064.56    1.309   133.13
2065.56    1.292   136.53
2066.56    1.274   140.02
2067.56    1.254   143.62
2068.56    1.233   147.34
2069.56    1.210   151.20
2070.56    1.187   155.20
2071.56    1.163   159.36
2072.56    1.139   163.70
2073.56    1.115   168.23
2074.56    1.092   172.95
2075.56    1.071   177.87
2076.56    1.051   182.98
2077.56    1.033   188.28
2078.56    1.019   193.74
2079.56    1.008   199.34
2080.56    1.001   205.04
2081.56    0.999   210.80
2082.56    1.001   216.55
2083.56    1.007   222.26
2084.56    1.019   227.87

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 14:52:03