Double Star Calculator - Orbit

Orbital Elements for BU172AB

WDS:	BU172AB	WDS ID/Discoverer
P:	145.070	Orbital period (years)
a:	0.402	Semi-major axis (arcseconds)
i:	161.4	Inclination (degrees)
Ω:	113.5	Longitude of ascending node (degrees)
T:	1987.660	Epoch of periastron passage (year)
e:	0.702	Eccentricity
ω:	296.9	Longitude of periastron (degrees)
Start-Year:	1952.465	Year
End-Year:	2097.535	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU172AB
Position:	222406.87-045013.2	Epoch-2000 right ascension and declination
WDS-ID:	22241-0450	WDS designation
Discoverer Code:	BU172AB	Discover designation and components
ADS number:	15902	Aitken Double Star catalog
HD number:	212404	HD catalog number
Hipparcos number:	110578	Hipparcos catalog number
V1:	6.45	Magnitude of the primary
V2:	6.63	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2014	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:	Tok2015c	Reference

Double Star Orbit for BU172AB

WDS 6th Orbit including measures of BU172AB

-- 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 BU172AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.546    19.43
--------------------------
1952.46    0.540   328.81
1953.46    0.533   327.87
1954.46    0.525   326.90
1955.46    0.518   325.91
1956.46    0.510   324.88
1957.46    0.501   323.82
1958.46    0.493   322.73
1959.46    0.484   321.59
1960.46    0.475   320.41
1961.46    0.465   319.19
1962.46    0.456   317.91
1963.46    0.446   316.58
1964.46    0.435   315.18
1965.46    0.424   313.72
1966.46    0.413   312.18
1967.46    0.402   310.55
1968.46    0.390   308.82
1969.46    0.377   306.98
1970.46    0.365   305.01
1971.46    0.351   302.90
1972.46    0.338   300.62
1973.46    0.323   298.14
1974.46    0.309   295.43
1975.46    0.294   292.44
1976.46    0.278   289.12
1977.46    0.261   285.40
1978.46    0.245   281.17
1979.46    0.227   276.30
1980.46    0.210   270.62
1981.46    0.192   263.89
1982.46    0.174   255.75
1983.46    0.156   245.76
1984.46    0.140   233.35
1985.46    0.126   217.99
1986.46    0.117   199.64
1987.46    0.115   179.35
1988.46    0.118   159.21
1989.46    0.127   141.15
1990.46    0.140   125.94
1991.46    0.155   113.44
1992.46    0.170   103.18
1993.46    0.187    94.67
1994.46    0.203    87.50
1995.46    0.218    81.38
1996.46    0.234    76.08
1997.46    0.249    71.44
1998.46    0.264    67.33
1999.46    0.278    63.64
2000.46    0.292    60.32
2001.46    0.306    57.30
2002.46    0.319    54.53
2003.46    0.332    51.98
2004.46    0.345    49.61
2005.46    0.357    47.42
2006.46    0.369    45.36
2007.46    0.380    43.43
2008.46    0.391    41.61
2009.46    0.402    39.89
2010.46    0.413    38.26
2011.46    0.423    36.72
2012.46    0.433    35.24
2013.46    0.443    33.83
2014.46    0.452    32.48
2015.46    0.461    31.18
2016.46    0.470    29.93
2017.46    0.479    28.73
2018.46    0.487    27.57
2019.46    0.495    26.45
2020.46    0.503    25.36
2021.46    0.511    24.31
2022.46    0.518    23.29
2023.46    0.526    22.29
2024.46    0.532    21.32
2025.46    0.539    20.38
2026.46    0.546    19.46
2027.46    0.552    18.56
2028.46    0.558    17.69
2029.46    0.564    16.83
2030.46    0.570    15.98
2031.46    0.575    15.16
2032.46    0.581    14.35
2033.46    0.586    13.55
2034.46    0.591    12.77
2035.46    0.596    12.00
2036.46    0.600    11.24
2037.46    0.604    10.50
2038.46    0.609     9.76
2039.46    0.613     9.04
2040.46    0.616     8.32
2041.46    0.620     7.61
2042.46    0.624     6.91
2043.46    0.627     6.22
2044.46    0.630     5.53
2045.46    0.633     4.85
2046.46    0.636     4.18
2047.46    0.638     3.51
2048.47    0.641     2.85
2049.47    0.643     2.19
2050.47    0.645     1.54
2051.47    0.647     0.89
2052.47    0.648     0.25
2053.47    0.650   359.60
2054.47    0.651   358.97
2055.47    0.653   358.33
2056.47    0.654   357.69
2057.47    0.654   357.06
2058.47    0.655   356.43
2059.47    0.656   355.80
2060.47    0.656   355.17
2061.47    0.656   354.54
2062.47    0.656   353.91
2063.47    0.656   353.28
2064.47    0.656   352.66
2065.47    0.655   352.03
2066.47    0.655   351.39
2067.47    0.654   350.76
2068.47    0.653   350.13
2069.47    0.651   349.49
2070.47    0.650   348.85
2071.47    0.649   348.21
2072.47    0.647   347.56
2073.47    0.645   346.91
2074.47    0.643   346.26
2075.47    0.641   345.60
2076.47    0.638   344.94
2077.47    0.635   344.27
2078.47    0.633   343.60
2079.47    0.630   342.92
2080.47    0.626   342.24
2081.47    0.623   341.54
2082.47    0.619   340.84
2083.47    0.616   340.13
2084.47    0.612   339.41
2085.47    0.607   338.68
2086.47    0.603   337.94
2087.47    0.598   337.19
2088.47    0.594   336.43
2089.47    0.589   335.66
2090.47    0.583   334.87
2091.47    0.578   334.07
2092.47    0.572   333.25
2093.47    0.566   332.41
2094.47    0.560   331.56
2095.47    0.554   330.69
2096.47    0.547   329.79
2097.47    0.540   328.88

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 18:39:34