Double Star Calculator - Orbit

Orbital Elements for A2172

WDS:	A2172	WDS ID/Discoverer
P:	168.300	Orbital period (years)
a:	0.196	Semi-major axis (arcseconds)
i:	115.0	Inclination (degrees)
Ω:	128.5	Longitude of ascending node (degrees)
T:	2000.400	Epoch of periastron passage (year)
e:	0.177	Eccentricity
ω:	326.0	Longitude of periastron (degrees)
Start-Year:	1940.85	Year
End-Year:	2109.15	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A2172
Position:	145630.89+025512.2	Epoch-2000 right ascension and declination
WDS-ID:	14565+0255	WDS designation
Discoverer Code:	A2172	Discover designation and components
ADS number:	9443	Aitken Double Star catalog
HD number:	131954	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	8.0	Magnitude of the primary
V2:	8.6	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2009	Date of last observation
Orbit grade:	3	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 A2172

WDS 6th Orbit including measures of A2172

-- 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 A2172

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.146   108.57
--------------------------
1940.85    0.220   306.57
1941.85    0.218   305.86
1942.85    0.217   305.14
1943.85    0.215   304.41
1944.85    0.213   303.66
1945.85    0.211   302.90
1946.85    0.209   302.13
1947.85    0.207   301.34
1948.85    0.204   300.53
1949.85    0.201   299.70
1950.85    0.198   298.84
1951.85    0.195   297.96
1952.85    0.192   297.04
1953.85    0.188   296.10
1954.85    0.185   295.12
1955.85    0.181   294.09
1956.85    0.177   293.03
1957.85    0.173   291.91
1958.85    0.168   290.73
1959.85    0.164   289.50
1960.85    0.160   288.19
1961.85    0.155   286.81
1962.85    0.150   285.34
1963.85    0.145   283.77
1964.85    0.140   282.09
1965.85    0.135   280.28
1966.85    0.130   278.34
1967.85    0.125   276.23
1968.85    0.120   273.94
1969.85    0.115   271.44
1970.85    0.109   268.72
1971.85    0.104   265.73
1972.85    0.100   262.44
1973.85    0.095   258.82
1974.85    0.091   254.84
1975.85    0.086   250.47
1976.85    0.083   245.68
1977.85    0.079   240.48
1978.85    0.077   234.88
1979.85    0.075   228.92
1980.85    0.073   222.69
1981.85    0.073   216.30
1982.85    0.073   209.87
1983.85    0.074   203.54
1984.85    0.076   197.44
1985.85    0.078   191.64
1986.85    0.081   186.22
1987.85    0.084   181.20
1988.85    0.088   176.59
1989.85    0.092   172.38
1990.85    0.097   168.54
1991.85    0.101   165.03
1992.85    0.106   161.83
1993.85    0.110   158.90
1994.85    0.115   156.21
1995.85    0.120   153.72
1996.85    0.124   151.42
1997.85    0.129   149.28
1998.85    0.133   147.28
1999.85    0.137   145.40
2000.85    0.141   143.63
2001.85    0.144   141.94
2002.85    0.148   140.34
2003.85    0.151   138.81
2004.85    0.154   137.34
2005.85    0.156   135.92
2006.85    0.159   134.55
2007.85    0.161   133.21
2008.85    0.162   131.90
2009.85    0.164   130.62
2010.85    0.165   129.35
2011.85    0.166   128.11
2012.85    0.166   126.87
2013.85    0.166   125.63
2014.85    0.166   124.40
2015.85    0.166   123.16
2016.85    0.165   121.91
2017.85    0.164   120.66
2018.85    0.163   119.38
2019.85    0.162   118.09
2020.85    0.160   116.76
2021.85    0.158   115.41
2022.85    0.156   114.02
2023.85    0.154   112.60
2024.85    0.151   111.12
2025.85    0.148   109.59
2026.85    0.145   108.01
2027.85    0.142   106.36
2028.85    0.139   104.63
2029.85    0.136   102.83
2030.85    0.133   100.94
2031.85    0.129    98.95
2032.85    0.126    96.85
2033.85    0.123    94.63
2034.85    0.119    92.29
2035.85    0.116    89.81
2036.85    0.112    87.18
2037.85    0.109    84.40
2038.85    0.106    81.45
2039.85    0.103    78.32
2040.85    0.100    75.02
2041.85    0.098    71.53
2042.85    0.096    67.88
2043.85    0.094    64.05
2044.85    0.092    60.07
2045.85    0.091    55.95
2046.85    0.090    51.73
2047.85    0.089    47.44
2048.85    0.089    43.11
2049.85    0.089    38.78
2050.85    0.090    34.50
2051.85    0.091    30.29
2052.85    0.092    26.19
2053.85    0.094    22.24
2054.85    0.096    18.44
2055.85    0.098    14.82
2056.85    0.101    11.37
2057.85    0.104     8.12
2058.85    0.107     5.05
2059.85    0.110     2.15
2060.85    0.114   359.43
2061.85    0.117   356.87
2062.85    0.121   354.47
2063.85    0.125   352.21
2064.85    0.129   350.09
2065.85    0.133   348.09
2066.85    0.137   346.20
2067.85    0.141   344.42
2068.85    0.144   342.74
2069.85    0.148   341.14
2070.85    0.152   339.63
2071.85    0.156   338.19
2072.85    0.160   336.83
2073.85    0.164   335.52
2074.85    0.168   334.28
2075.85    0.171   333.09
2076.85    0.175   331.94
2077.85    0.178   330.85
2078.85    0.182   329.79
2079.85    0.185   328.77
2080.85    0.188   327.79
2081.85    0.191   326.84
2082.85    0.194   325.92
2083.85    0.197   325.02
2084.85    0.200   324.15
2085.85    0.202   323.31
2086.85    0.205   322.48
2087.85    0.207   321.68
2088.85    0.209   320.89
2089.85    0.211   320.11
2090.85    0.213   319.36
2091.85    0.215   318.61
2092.85    0.217   317.88
2093.85    0.218   317.15
2094.85    0.219   316.44
2095.85    0.221   315.73
2096.85    0.222   315.03
2097.85    0.222   314.34
2098.85    0.223   313.65
2099.85    0.224   312.97
2100.85    0.224   312.28
2101.85    0.224   311.60
2102.85    0.224   310.92
2103.85    0.224   310.24
2104.85    0.223   309.56
2105.85    0.223   308.87
2106.85    0.222   308.18
2107.85    0.221   307.48
2108.85    0.220   306.78

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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 17:10:43