Double Star Calculator - Orbit

Orbital Elements for BU1205

WDS:	BU1205	WDS ID/Discoverer
P:	139.900	Orbital period (years)
a:	0.486	Semi-major axis (arcseconds)
i:	78.3	Inclination (degrees)
Ω:	231.24	Longitude of ascending node (degrees)
T:	1983.500	Epoch of periastron passage (year)
e:	0.384	Eccentricity
ω:	10.4	Longitude of periastron (degrees)
Start-Year:	1955.05	Year
End-Year:	2094.95	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU1205
Position:	201215.32-080532.1	Epoch-2000 right ascension and declination
WDS-ID:	20123-0806	WDS designation
Discoverer Code:	BU1205	Discover designation and components
ADS number:	13493	Aitken Double Star catalog
HD number:	191841	HD catalog number
Hipparcos number:	99558	Hipparcos catalog number
V1:	7.5	Magnitude of the primary
V2:	8.8	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2008	Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Hrt2010a	Reference

Double Star Orbit for BU1205

WDS 6th Orbit including measures of BU1205

-- 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 BU1205

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.544    45.68
--------------------------
1955.05    0.175    85.07
1956.05    0.158    89.19
1957.05    0.141    94.31
1958.05    0.126   100.74
1959.05    0.112   108.88
1960.05    0.100   119.07
1961.05    0.093   131.34
1962.05    0.090   145.08
1963.05    0.092   158.94
1964.05    0.099   171.50
1965.05    0.110   182.04
1966.05    0.123   190.50
1967.05    0.138   197.22
1968.05    0.154   202.58
1969.05    0.171   206.91
1970.05    0.187   210.48
1971.05    0.203   213.47
1972.05    0.219   216.02
1973.05    0.234   218.23
1974.05    0.248   220.18
1975.05    0.261   221.94
1976.05    0.273   223.53
1977.05    0.282   225.01
1978.05    0.290   226.40
1979.05    0.296   227.72
1980.05    0.300   229.00
1981.05    0.301   230.26
1982.05    0.300   231.51
1983.05    0.297   232.79
1984.05    0.291   234.10
1985.05    0.283   235.48
1986.05    0.273   236.95
1987.05    0.260   238.55
1988.05    0.246   240.33
1989.05    0.230   242.34
1990.05    0.213   244.66
1991.05    0.194   247.42
1992.05    0.175   250.77
1993.05    0.155   254.96
1994.05    0.136   260.36
1995.05    0.117   267.51
1996.05    0.101   277.21
1997.05    0.087   290.28
1998.05    0.080   306.89
1999.05    0.079   325.26
2000.05    0.086   342.17
2001.05    0.099   355.59
2002.05    0.116     5.55
2003.05    0.135    12.86
2004.05    0.155    18.33
2005.05    0.176    22.52
2006.05    0.197    25.81
2007.05    0.218    28.47
2008.05    0.239    30.66
2009.05    0.259    32.50
2010.05    0.280    34.07
2011.05    0.300    35.43
2012.05    0.319    36.62
2013.05    0.338    37.67
2014.05    0.357    38.61
2015.05    0.375    39.46
2016.05    0.393    40.23
2017.05    0.410    40.94
2018.05    0.426    41.59
2019.05    0.442    42.19
2020.05    0.458    42.75
2021.05    0.473    43.28
2022.05    0.487    43.77
2023.05    0.501    44.24
2024.05    0.514    44.68
2025.05    0.527    45.10
2026.05    0.539    45.50
2027.05    0.550    45.89
2028.05    0.561    46.25
2029.05    0.572    46.61
2030.05    0.582    46.95
2031.05    0.591    47.28
2032.05    0.600    47.60
2033.05    0.608    47.91
2034.05    0.616    48.22
2035.05    0.623    48.51
2036.05    0.630    48.80
2037.05    0.636    49.09
2038.05    0.641    49.37
2039.05    0.646    49.64
2040.05    0.651    49.91
2041.05    0.655    50.18
2042.05    0.658    50.44
2043.05    0.661    50.70
2044.05    0.664    50.96
2045.05    0.666    51.22
2046.05    0.667    51.48
2047.05    0.668    51.73
2048.05    0.668    51.99
2049.05    0.668    52.24
2050.05    0.668    52.50
2051.05    0.667    52.75
2052.05    0.665    53.01
2053.05    0.663    53.27
2054.05    0.660    53.53
2055.05    0.657    53.79
2056.05    0.654    54.05
2057.05    0.650    54.32
2058.05    0.645    54.59
2059.05    0.640    54.87
2060.05    0.635    55.15
2061.05    0.629    55.43
2062.05    0.622    55.72
2063.05    0.616    56.02
2064.05    0.608    56.33
2065.05    0.600    56.64
2066.05    0.592    56.96
2067.05    0.583    57.29
2068.05    0.574    57.63
2069.05    0.564    57.98
2070.05    0.554    58.34
2071.05    0.544    58.72
2072.05    0.533    59.11
2073.05    0.521    59.52
2074.05    0.509    59.95
2075.05    0.497    60.40
2076.05    0.484    60.87
2077.05    0.471    61.37
2078.05    0.457    61.90
2079.05    0.443    62.47
2080.05    0.428    63.06
2081.05    0.414    63.71
2082.05    0.398    64.40
2083.05    0.383    65.14
2084.05    0.367    65.96
2085.05    0.350    66.84
2086.05    0.333    67.82
2087.05    0.316    68.90
2088.05    0.299    70.10
2089.05    0.281    71.45
2090.05    0.264    72.99
2091.05    0.246    74.75
2092.05    0.227    76.78
2093.05    0.209    79.17
2094.05    0.191    82.02

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 18:12:36