Double Star Calculator - Orbit

Orbital Elements for BU270AB

WDS:	BU270AB	WDS ID/Discoverer
P:	114.300	Orbital period (years)
a:	0.3765	Semi-major axis (arcseconds)
i:	105.1	Inclination (degrees)
Ω:	169.6	Longitude of ascending node (degrees)
T:	1933.300	Epoch of periastron passage (year)
e:	0.636	Eccentricity
ω:	351.5	Longitude of periastron (degrees)
Start-Year:	1967.85	Year
End-Year:	2082.15	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU270AB
Position:	211327.24+071304.9	Epoch-2000 right ascension and declination
WDS-ID:	21135+0713	WDS designation
Discoverer Code:	BU270AB	Discover designation and components
ADS number:	14759	Aitken Double Star catalog
HD number:	202073	HD catalog number
Hipparcos number:	104767	Hipparcos catalog number
V1:	7.42	Magnitude of the primary
V2:	9.40	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2021	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:	Tok2024b	Reference

Double Star Orbit for BU270AB

WDS 6th Orbit including measures of BU270AB

-- 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 BU270AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.362   339.91
--------------------------
1967.85    0.474   358.41
1968.85    0.484   358.02
1969.85    0.495   357.65
1970.85    0.504   357.29
1971.85    0.514   356.94
1972.85    0.522   356.61
1973.85    0.531   356.28
1974.85    0.539   355.97
1975.85    0.546   355.67
1976.85    0.554   355.37
1977.85    0.560   355.08
1978.85    0.567   354.80
1979.85    0.572   354.52
1980.85    0.578   354.25
1981.85    0.583   353.98
1982.85    0.588   353.72
1983.85    0.592   353.46
1984.85    0.596   353.21
1985.85    0.599   352.96
1986.85    0.602   352.71
1987.85    0.605   352.46
1988.85    0.607   352.22
1989.85    0.609   351.97
1990.85    0.610   351.73
1991.85    0.611   351.49
1992.85    0.612   351.25
1993.85    0.612   351.01
1994.85    0.612   350.77
1995.85    0.611   350.53
1996.85    0.610   350.29
1997.85    0.608   350.05
1998.85    0.606   349.81
1999.85    0.604   349.56
2000.85    0.601   349.31
2001.85    0.598   349.06
2002.85    0.594   348.81
2003.85    0.590   348.56
2004.85    0.586   348.30
2005.85    0.581   348.03
2006.85    0.575   347.76
2007.85    0.569   347.49
2008.85    0.563   347.21
2009.85    0.556   346.92
2010.85    0.548   346.63
2011.85    0.541   346.32
2012.85    0.532   346.01
2013.85    0.523   345.69
2014.85    0.514   345.36
2015.85    0.504   345.01
2016.85    0.493   344.65
2017.85    0.482   344.27
2018.85    0.471   343.88
2019.85    0.459   343.46
2020.85    0.446   343.02
2021.85    0.433   342.56
2022.85    0.419   342.06
2023.85    0.404   341.53
2024.85    0.389   340.96
2025.85    0.373   340.34
2026.85    0.356   339.66
2027.85    0.339   338.92
2028.85    0.321   338.09
2029.85    0.302   337.17
2030.85    0.282   336.11
2031.85    0.262   334.90
2032.85    0.241   333.48
2033.85    0.219   331.78
2034.85    0.196   329.69
2035.85    0.173   327.06
2036.85    0.149   323.59
2037.85    0.125   318.79
2038.85    0.101   311.71
2039.85    0.079   300.46
2040.85    0.061   281.51
2041.85    0.053   252.45
2042.85    0.059   222.49
2043.85    0.076   202.17
2044.85    0.096   189.81
2045.85    0.115   181.68
2046.85    0.129   175.66
2047.85    0.137   170.62
2048.85    0.137   165.89
2049.85    0.131   160.94
2050.85    0.119   155.22
2051.85    0.105   148.06
2052.85    0.089   138.45
2053.85    0.075   124.98
2054.85    0.066   106.51
2055.85    0.064    84.56
2056.85    0.070    64.09
2057.85    0.083    48.56
2058.85    0.100    37.70
2059.85    0.118    30.09
2060.85    0.138    24.59
2061.85    0.158    20.46
2062.85    0.177    17.25
2063.85    0.197    14.67
2064.85    0.216    12.56
2065.85    0.235    10.79
2066.85    0.253     9.28
2067.85    0.271     7.98
2068.85    0.288     6.83
2069.85    0.305     5.81
2070.85    0.322     4.90
2071.85    0.338     4.07
2072.85    0.353     3.32
2073.85    0.368     2.63
2074.85    0.383     1.99
2075.85    0.397     1.40
2076.85    0.410     0.85
2077.85    0.423     0.33
2078.85    0.436   359.85
2079.85    0.448   359.39
2080.85    0.459   358.95
2081.85    0.471   358.53

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 18:23:51