Double Star Calculator - Orbit

Orbital Elements for A2189

WDS:	A2189	WDS ID/Discoverer
P:	171.730	Orbital period (years)
a:	0.235	Semi-major axis (arcseconds)
i:	71.0	Inclination (degrees)
Ω:	150.8	Longitude of ascending node (degrees)
T:	1975.080	Epoch of periastron passage (year)
e:	0.517	Eccentricity
ω:	328.3	Longitude of periastron (degrees)
Start-Year:	1939.135	Year
End-Year:	2110.865	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A2189
Position:	175616.70+025909.1	Epoch-2000 right ascension and declination
WDS-ID:	17563+0259	WDS designation
Discoverer Code:	A2189	Discover designation and components
ADS number:	10899	Aitken Double Star catalog
HD number:	163471	HD catalog number
Hipparcos number:	87811	Hipparcos catalog number
V1:	8.5	Magnitude of the primary
V2:	8.8	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2018	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:	Doc2018l	Reference

Double Star Orbit for A2189

WDS 6th Orbit including measures of A2189

-- 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 A2189

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.177   300.42
--------------------------
1939.13    0.256   336.07
1940.13    0.250   336.57
1941.13    0.245   337.10
1942.13    0.239   337.65
1943.13    0.233   338.23
1944.13    0.226   338.85
1945.13    0.220   339.49
1946.13    0.213   340.18
1947.13    0.206   340.92
1948.13    0.199   341.71
1949.13    0.191   342.56
1950.13    0.183   343.48
1951.13    0.175   344.49
1952.13    0.167   345.59
1953.13    0.158   346.81
1954.13    0.149   348.18
1955.13    0.140   349.72
1956.13    0.131   351.48
1957.13    0.121   353.51
1958.13    0.112   355.89
1959.13    0.102   358.72
1960.13    0.092     2.17
1961.13    0.082     6.43
1962.13    0.073    11.83
1963.13    0.064    18.82
1964.13    0.056    27.97
1965.13    0.049    39.91
1966.13    0.045    54.74
1967.13    0.044    71.35
1968.13    0.046    87.46
1969.13    0.051   101.14
1970.13    0.058   111.93
1971.13    0.067   120.23
1972.13    0.075   126.69
1973.13    0.083   131.84
1974.13    0.092   136.05
1975.13    0.099   139.61
1976.13    0.105   142.70
1977.13    0.111   145.46
1978.13    0.116   147.97
1979.13    0.119   150.31
1980.13    0.121   152.54
1981.13    0.123   154.70
1982.13    0.123   156.83
1983.13    0.123   158.95
1984.13    0.122   161.10
1985.13    0.120   163.29
1986.13    0.118   165.55
1987.13    0.116   167.91
1988.13    0.113   170.39
1989.13    0.109   173.02
1990.13    0.106   175.82
1991.13    0.102   178.81
1992.13    0.098   182.02
1993.13    0.095   185.49
1994.13    0.091   189.23
1995.13    0.088   193.26
1996.13    0.085   197.61
1997.13    0.082   202.27
1998.13    0.079   207.23
1999.13    0.078   212.47
2000.13    0.076   217.93
2001.13    0.075   223.55
2002.13    0.075   229.23
2003.13    0.076   234.90
2004.13    0.077   240.44
2005.13    0.079   245.79
2006.13    0.081   250.88
2007.13    0.084   255.66
2008.13    0.087   260.11
2009.13    0.090   264.23
2010.13    0.094   268.02
2011.13    0.099   271.49
2012.13    0.103   274.68
2013.13    0.108   277.59
2014.13    0.112   280.26
2015.13    0.117   282.70
2016.13    0.122   284.95
2017.13    0.128   287.01
2018.13    0.133   288.92
2019.13    0.138   290.68
2020.13    0.143   292.31
2021.13    0.149   293.83
2022.13    0.154   295.24
2023.13    0.159   296.56
2024.13    0.164   297.79
2025.13    0.169   298.95
2026.13    0.175   300.04
2027.13    0.180   301.07
2028.13    0.185   302.04
2029.13    0.190   302.96
2030.13    0.195   303.83
2031.13    0.200   304.66
2032.13    0.205   305.45
2033.13    0.210   306.20
2034.13    0.214   306.92
2035.13    0.219   307.60
2036.13    0.224   308.26
2037.13    0.228   308.90
2038.13    0.233   309.50
2039.13    0.237   310.09
2040.13    0.241   310.65
2041.13    0.245   311.20
2042.13    0.249   311.73
2043.13    0.253   312.24
2044.13    0.257   312.73
2045.13    0.261   313.21
2046.13    0.265   313.68
2047.13    0.269   314.13
2048.14    0.272   314.57
2049.14    0.276   315.00
2050.14    0.279   315.42
2051.14    0.282   315.83
2052.14    0.286   316.23
2053.14    0.289   316.62
2054.14    0.292   317.00
2055.14    0.295   317.38
2056.14    0.297   317.75
2057.14    0.300   318.11
2058.14    0.303   318.46
2059.14    0.305   318.81
2060.14    0.308   319.16
2061.14    0.310   319.49
2062.14    0.312   319.83
2063.14    0.314   320.16
2064.14    0.316   320.48
2065.14    0.318   320.80
2066.14    0.319   321.12
2067.14    0.321   321.44
2068.14    0.323   321.75
2069.14    0.324   322.06
2070.14    0.325   322.36
2071.14    0.326   322.67
2072.14    0.327   322.97
2073.14    0.328   323.27
2074.14    0.329   323.57
2075.14    0.330   323.87
2076.14    0.330   324.16
2077.14    0.331   324.46
2078.14    0.331   324.75
2079.14    0.331   325.05
2080.14    0.331   325.34
2081.14    0.331   325.64
2082.14    0.331   325.93
2083.14    0.330   326.23
2084.14    0.330   326.52
2085.14    0.329   326.82
2086.14    0.328   327.12
2087.14    0.327   327.42
2088.14    0.326   327.72
2089.14    0.325   328.03
2090.14    0.323   328.33
2091.14    0.322   328.64
2092.14    0.320   328.96
2093.14    0.318   329.27
2094.14    0.316   329.59
2095.14    0.314   329.92
2096.14    0.312   330.25
2097.14    0.309   330.58
2098.14    0.306   330.92
2099.14    0.304   331.27
2100.14    0.300   331.62
2101.14    0.297   331.99
2102.14    0.294   332.35
2103.14    0.290   332.73
2104.14    0.286   333.12
2105.14    0.282   333.52
2106.14    0.278   333.93
2107.14    0.274   334.35
2108.14    0.269   334.79
2109.14    0.264   335.24
2110.14    0.259   335.71

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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 17:44:38