Double Star Calculator - Orbit

Orbital Elements for BU741AB

WDS:	BU741AB	WDS ID/Discoverer
P:	151.300	Orbital period (years)
a:	1.343	Semi-major axis (arcseconds)
i:	81.8	Inclination (degrees)
Ω:	163.2	Longitude of ascending node (degrees)
T:	1870.600	Epoch of periastron passage (year)
e:	0.54	Eccentricity
ω:	259.7	Longitude of periastron (degrees)
Start-Year:	1949.35	Year
End-Year:	2100.65	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU741AB
Position:	025714.69-245809.9	Epoch-2000 right ascension and declination
WDS-ID:	02572-2458	WDS designation
Discoverer Code:	BU741AB	Discover designation and components
ADS number:	2242	Aitken Double Star catalog
HD number:	18455	HD catalog number
Hipparcos number:	13772	Hipparcos catalog number
V1:	8.06	Magnitude of the primary
V2:	8.20	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2019	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:	Tok2019h	Reference

Double Star Orbit for BU741AB

WDS 6th Orbit including measures of BU741AB

-- 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 BU741AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.354   149.67
--------------------------
1949.35    0.402   209.81
1950.35    0.382   213.17
1951.35    0.363   216.89
1952.35    0.346   221.00
1953.35    0.330   225.52
1954.35    0.317   230.46
1955.35    0.306   235.79
1956.35    0.297   241.47
1957.35    0.292   247.42
1958.35    0.289   253.53
1959.35    0.290   259.67
1960.35    0.294   265.71
1961.35    0.301   271.53
1962.35    0.311   277.03
1963.35    0.323   282.16
1964.35    0.338   286.87
1965.35    0.354   291.18
1966.35    0.373   295.08
1967.35    0.392   298.61
1968.35    0.413   301.80
1969.35    0.434   304.68
1970.35    0.456   307.28
1971.35    0.479   309.63
1972.35    0.502   311.78
1973.35    0.526   313.73
1974.35    0.550   315.51
1975.35    0.574   317.14
1976.35    0.598   318.65
1977.35    0.622   320.03
1978.35    0.645   321.32
1979.35    0.669   322.51
1980.35    0.692   323.62
1981.35    0.716   324.66
1982.35    0.738   325.64
1983.35    0.761   326.55
1984.35    0.783   327.42
1985.35    0.804   328.24
1986.35    0.825   329.02
1987.35    0.845   329.75
1988.35    0.864   330.46
1989.35    0.883   331.14
1990.35    0.901   331.78
1991.35    0.917   332.41
1992.35    0.933   333.01
1993.35    0.948   333.59
1994.35    0.961   334.16
1995.35    0.973   334.71
1996.35    0.984   335.24
1997.35    0.993   335.77
1998.35    1.001   336.29
1999.35    1.007   336.80
2000.35    1.011   337.31
2001.35    1.012   337.81
2002.35    1.012   338.31
2003.35    1.008   338.82
2004.35    1.002   339.33
2005.35    0.993   339.84
2006.35    0.981   340.37
2007.35    0.965   340.92
2008.35    0.946   341.48
2009.35    0.922   342.07
2010.35    0.893   342.70
2011.35    0.859   343.37
2012.35    0.820   344.10
2013.35    0.774   344.91
2014.35    0.723   345.83
2015.35    0.664   346.90
2016.35    0.599   348.19
2017.35    0.527   349.82
2018.35    0.448   352.00
2019.35    0.363   355.16
2020.35    0.275     0.31
2021.35    0.186    10.42
2022.35    0.109    36.61
2023.35    0.096    95.41
2024.35    0.163   130.36
2025.35    0.251   143.01
2026.35    0.341   149.03
2027.35    0.429   152.55
2028.35    0.512   154.89
2029.35    0.590   156.60
2030.35    0.663   157.91
2031.35    0.731   158.97
2032.35    0.793   159.86
2033.35    0.850   160.62
2034.35    0.903   161.29
2035.35    0.950   161.89
2036.35    0.994   162.44
2037.35    1.033   162.94
2038.35    1.068   163.41
2039.35    1.100   163.84
2040.35    1.129   164.26
2041.35    1.154   164.65
2042.35    1.176   165.03
2043.35    1.196   165.40
2044.35    1.213   165.75
2045.35    1.228   166.10
2046.35    1.240   166.44
2047.35    1.250   166.77
2048.35    1.258   167.10
2049.35    1.264   167.42
2050.35    1.269   167.74
2051.35    1.272   168.06
2052.35    1.273   168.38
2053.35    1.272   168.70
2054.35    1.270   169.02
2055.35    1.267   169.34
2056.35    1.262   169.66
2057.35    1.257   169.98
2058.35    1.250   170.31
2059.35    1.241   170.64
2060.35    1.232   170.98
2061.35    1.222   171.32
2062.35    1.211   171.67
2063.35    1.199   172.03
2064.35    1.186   172.39
2065.35    1.172   172.76
2066.35    1.157   173.14
2067.35    1.142   173.53
2068.35    1.125   173.93
2069.35    1.108   174.34
2070.35    1.091   174.77
2071.35    1.073   175.21
2072.35    1.054   175.66
2073.35    1.035   176.14
2074.35    1.015   176.63
2075.35    0.994   177.14
2076.35    0.973   177.67
2077.35    0.952   178.23
2078.35    0.930   178.81
2079.35    0.908   179.42
2080.35    0.885   180.06
2081.35    0.862   180.73
2082.35    0.839   181.45
2083.35    0.816   182.20
2084.35    0.792   183.00
2085.35    0.768   183.84
2086.35    0.743   184.75
2087.35    0.719   185.71
2088.35    0.694   186.74
2089.35    0.670   187.85
2090.35    0.645   189.05
2091.35    0.620   190.33
2092.35    0.595   191.73
2093.35    0.571   193.25
2094.35    0.546   194.90
2095.35    0.522   196.70
2096.35    0.498   198.69
2097.35    0.475   200.86
2098.35    0.452   203.27
2099.35    0.430   205.92
2100.35    0.408   208.86

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 15:06:07