Double Star Calculator - Orbit

Orbital Elements for BU984

WDS:	BU984	WDS ID/Discoverer
P:	240.737	Orbital period (years)
a:	0.5633	Semi-major axis (arcseconds)
i:	46.5	Inclination (degrees)
Ω:	70.3	Longitude of ascending node (degrees)
T:	2018.744	Epoch of periastron passage (year)
e:	0.64	Eccentricity
ω:	306.9	Longitude of periastron (degrees)
Start-Year:	1904.6315	Year
End-Year:	2145.3685	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU984
Position:	201734.66+262213.0	Epoch-2000 right ascension and declination
WDS-ID:	20176+2622	WDS designation
Discoverer Code:	BU984	Discover designation and components
ADS number:	13649	Aitken Double Star catalog
HD number:	193095	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	8.22	Magnitude of the primary
V2:	9.39	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2012	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:	Cve2022	Reference

Double Star Orbit for BU984

WDS 6th Orbit including measures of BU984

-- 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 BU984

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.250    74.56
--------------------------
1904.63    0.764   210.51
1905.63    0.766   210.94
1906.63    0.768   211.37
1907.63    0.769   211.79
1908.63    0.771   212.22
1909.63    0.772   212.64
1910.63    0.773   213.06
1911.63    0.774   213.48
1912.63    0.775   213.90
1913.63    0.776   214.31
1914.63    0.777   214.73
1915.63    0.778   215.14
1916.63    0.779   215.56
1917.63    0.780   215.97
1918.63    0.780   216.38
1919.63    0.781   216.80
1920.63    0.781   217.21
1921.63    0.781   217.62
1922.63    0.782   218.03
1923.63    0.782   218.44
1924.63    0.782   218.85
1925.63    0.782   219.26
1926.63    0.782   219.67
1927.63    0.781   220.08
1928.63    0.781   220.50
1929.63    0.780   220.91
1930.63    0.780   221.32
1931.63    0.779   221.73
1932.63    0.779   222.15
1933.63    0.778   222.56
1934.63    0.777   222.98
1935.63    0.776   223.39
1936.63    0.775   223.81
1937.63    0.773   224.23
1938.63    0.772   224.65
1939.63    0.770   225.07
1940.63    0.769   225.50
1941.63    0.767   225.92
1942.63    0.765   226.35
1943.63    0.763   226.78
1944.63    0.761   227.21
1945.63    0.759   227.65
1946.63    0.757   228.08
1947.63    0.754   228.52
1948.63    0.752   228.97
1949.63    0.749   229.41
1950.63    0.746   229.86
1951.63    0.743   230.31
1952.63    0.740   230.77
1953.63    0.737   231.23
1954.63    0.733   231.70
1955.63    0.730   232.16
1956.63    0.726   232.64
1957.63    0.722   233.12
1958.63    0.718   233.60
1959.63    0.714   234.09
1960.63    0.710   234.59
1961.63    0.705   235.09
1962.63    0.701   235.60
1963.63    0.696   236.11
1964.63    0.691   236.63
1965.63    0.686   237.16
1966.63    0.680   237.70
1967.63    0.675   238.25
1968.63    0.669   238.80
1969.63    0.663   239.37
1970.63    0.657   239.94
1971.63    0.651   240.53
1972.63    0.644   241.13
1973.63    0.638   241.74
1974.63    0.631   242.36
1975.63    0.624   243.00
1976.63    0.616   243.66
1977.63    0.609   244.33
1978.63    0.601   245.01
1979.63    0.593   245.72
1980.63    0.584   246.44
1981.63    0.576   247.19
1982.63    0.567   247.96
1983.63    0.558   248.75
1984.63    0.548   249.57
1985.63    0.539   250.42
1986.63    0.529   251.30
1987.63    0.519   252.21
1988.63    0.508   253.17
1989.63    0.497   254.16
1990.63    0.486   255.20
1991.63    0.474   256.29
1992.63    0.462   257.44
1993.63    0.450   258.64
1994.63    0.437   259.92
1995.63    0.424   261.27
1996.63    0.411   262.71
1997.63    0.397   264.25
1998.63    0.383   265.91
1999.63    0.368   267.69
2000.63    0.353   269.62
2001.63    0.337   271.73
2002.63    0.322   274.04
2003.63    0.306   276.59
2004.63    0.289   279.43
2005.63    0.272   282.62
2006.63    0.256   286.22
2007.63    0.239   290.33
2008.63    0.222   295.05
2009.63    0.206   300.53
2010.63    0.191   306.90
2011.63    0.177   314.33
2012.63    0.165   322.93
2013.63    0.156   332.70
2014.63    0.150   343.46
2015.63    0.148   354.79
2016.63    0.150     6.12
2017.63    0.156    16.90
2018.63    0.164    26.74
2019.63    0.174    35.52
2020.63    0.186    43.27
2021.63    0.198    50.09
2022.63    0.210    56.15
2023.63    0.221    61.57
2024.63    0.232    66.47
2025.63    0.242    70.95
2026.63    0.251    75.08
2027.63    0.260    78.93
2028.63    0.268    82.54
2029.63    0.275    85.95
2030.63    0.282    89.18
2031.63    0.288    92.27
2032.63    0.294    95.22
2033.63    0.300    98.06
2034.63    0.306   100.80
2035.63    0.311   103.43
2036.63    0.316   105.99
2037.63    0.321   108.46
2038.63    0.326   110.86
2039.63    0.331   113.19
2040.63    0.335   115.46
2041.63    0.340   117.66
2042.63    0.344   119.80
2043.63    0.349   121.89
2044.63    0.354   123.93
2045.63    0.358   125.91
2046.63    0.363   127.84
2047.63    0.367   129.72
2048.63    0.372   131.56
2049.63    0.376   133.35
2050.63    0.381   135.10
2051.63    0.386   136.81
2052.63    0.391   138.48
2053.63    0.395   140.10
2054.63    0.400   141.69
2055.63    0.405   143.24
2056.63    0.410   144.75
2057.63    0.415   146.23
2058.63    0.419   147.67
2059.63    0.424   149.08
2060.63    0.429   150.46
2061.63    0.434   151.81
2062.63    0.439   153.12
2063.63    0.444   154.41
2064.63    0.449   155.66
2065.63    0.454   156.89
2066.63    0.459   158.10
2067.63    0.464   159.27
2068.63    0.469   160.42
2069.63    0.475   161.55
2070.63    0.480   162.65
2071.63    0.485   163.73
2072.63    0.490   164.79
2073.63    0.495   165.83
2074.63    0.500   166.84
2075.63    0.505   167.83
2076.63    0.510   168.81
2077.63    0.515   169.77
2078.63    0.520   170.70
2079.63    0.525   171.62
2080.63    0.530   172.52
2081.63    0.535   173.41
2082.63    0.540   174.28
2083.63    0.545   175.13
2084.63    0.550   175.97
2085.63    0.555   176.79
2086.63    0.560   177.60
2087.63    0.564   178.40
2088.63    0.569   179.18
2089.63    0.574   179.94
2090.63    0.579   180.70
2091.63    0.583   181.44
2092.63    0.588   182.18
2093.63    0.593   182.90
2094.63    0.597   183.60
2095.63    0.602   184.30
2096.63    0.606   184.99
2097.63    0.611   185.67
2098.63    0.615   186.33
2099.63    0.620   186.99
2100.63    0.624   187.64
2101.63    0.629   188.28
2102.63    0.633   188.91
2103.63    0.637   189.53
2104.63    0.641   190.15
2105.63    0.645   190.76
2106.63    0.650   191.35
2107.63    0.654   191.95
2108.63    0.658   192.53
2109.63    0.662   193.11
2110.63    0.665   193.68
2111.63    0.669   194.24
2112.63    0.673   194.80
2113.63    0.677   195.35
2114.63    0.681   195.89
2115.63    0.684   196.43
2116.63    0.688   196.96
2117.63    0.691   197.49
2118.63    0.695   198.01
2119.63    0.698   198.53
2120.63    0.702   199.04
2121.63    0.705   199.55
2122.63    0.708   200.05
2123.63    0.711   200.55
2124.63    0.714   201.05
2125.63    0.718   201.54
2126.63    0.721   202.02
2127.63    0.723   202.50
2128.63    0.726   202.98
2129.63    0.729   203.45
2130.63    0.732   203.92
2131.63    0.735   204.39
2132.63    0.737   204.86
2133.63    0.740   205.32
2134.63    0.742   205.77
2135.63    0.745   206.23
2136.63    0.747   206.68
2137.63    0.749   207.13
2138.63    0.751   207.57
2139.63    0.754   208.02
2140.63    0.756   208.46
2141.63    0.758   208.89
2142.63    0.760   209.33
2143.63    0.761   209.76
2144.63    0.763   210.20

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 18:13:31