Content-Type: text/html; charset=UTF-8 Double Star Calculator - Orbital Elements

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:27:39

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:	1941.0	Year
End-Year:	2109.0	Year
Epoch:	2025.0	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' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for A2172

WDS 6th Orbit including measures of A2172

Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements)

Ephemeris of A2172

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.151    110.9
-------------------------
1941.0     0.220    306.5
1942.0     0.218    305.8
1943.0     0.217    305.0
1944.0     0.215    304.3
1945.0     0.213    303.5
1946.0     0.211    302.8
1947.0     0.209    302.0
1948.0     0.206    301.2
1949.0     0.204    300.4
1950.0     0.201    299.6
1951.0     0.198    298.7
1952.0     0.195    297.8
1953.0     0.191    296.9
1954.0     0.188    296.0
1955.0     0.184    295.0
1956.0     0.180    293.9
1957.0     0.176    292.9
1958.0     0.172    291.7
1959.0     0.168    290.6
1960.0     0.163    289.3
1961.0     0.159    288.0
1962.0     0.154    286.6
1963.0     0.149    285.1
1964.0     0.144    283.5
1965.0     0.139    281.8
1966.0     0.134    280.0
1967.0     0.129    278.0
1968.0     0.124    275.9
1969.0     0.119    273.6
1970.0     0.114    271.1
1971.0     0.109    268.3
1972.0     0.104    265.3
1973.0     0.099    261.9
1974.0     0.094    258.2
1975.0     0.090    254.2
1976.0     0.086    249.8
1977.0     0.082    244.9
1978.0     0.079    239.7
1979.0     0.076    234.0
1980.0     0.075    228.0
1981.0     0.073    221.7
1982.0     0.073    215.3
1983.0     0.073    208.9
1984.0     0.074    202.6
1985.0     0.076    196.5
1986.0     0.078    190.8
1987.0     0.081    185.4
1988.0     0.085    180.5
1989.0     0.089    175.9
1990.0     0.093    171.8
1991.0     0.097    168.0
1992.0     0.102    164.5
1993.0     0.106    161.4
1994.0     0.111    158.5
1995.0     0.116    155.8
1996.0     0.120    153.4
1997.0     0.125    151.1
1998.0     0.129    149.0
1999.0     0.133    147.0
2000.0     0.137    145.1
2001.0     0.141    143.4
2002.0     0.145    141.7
2003.0     0.148    140.1
2004.0     0.151    138.6
2005.0     0.154    137.1
2006.0     0.157    135.7
2007.0     0.159    134.3
2008.0     0.161    133.0
2009.0     0.163    131.7
2010.0     0.164    130.4
2011.0     0.165    129.2
2012.0     0.166    127.9
2013.0     0.166    126.7
2014.0     0.166    125.4
2015.0     0.166    124.2
2016.0     0.166    123.0
2017.0     0.165    121.7
2018.0     0.164    120.5
2019.0     0.163    119.2
2020.0     0.161    117.9
2021.0     0.160    116.6
2022.0     0.158    115.2
2023.0     0.156    113.8
2024.0     0.153    112.4
2025.0     0.151    110.9
2026.0     0.148    109.4
2027.0     0.145    107.8
2028.0     0.142    106.1
2029.0     0.139    104.4
2030.0     0.136    102.6
2031.0     0.132    100.6
2032.0     0.129     98.6
2033.0     0.125     96.5
2034.0     0.122     94.3
2035.0     0.119     91.9
2036.0     0.115     89.4
2037.0     0.112     86.8
2038.0     0.109     84.0
2039.0     0.106     81.0
2040.0     0.103     77.8
2041.0     0.100     74.5
2042.0     0.097     71.0
2043.0     0.095     67.3
2044.0     0.093     63.5
2045.0     0.092     59.5
2046.0     0.090     55.3
2047.0     0.089     51.1
2048.0     0.089     46.8
2049.0     0.089     42.5
2050.0     0.089     38.1
2051.0     0.090     33.9
2052.0     0.091     29.7
2053.0     0.092     25.6
2054.0     0.094     21.7
2055.0     0.096     17.9
2056.0     0.099     14.3
2057.0     0.101     10.9
2058.0     0.104      7.6
2059.0     0.108      4.6
2060.0     0.111      1.7
2061.0     0.114    359.0
2062.0     0.118    356.5
2063.0     0.122    354.1
2064.0     0.125    351.9
2065.0     0.129    349.8
2066.0     0.133    347.8
2067.0     0.137    345.9
2068.0     0.141    344.2
2069.0     0.145    342.5
2070.0     0.149    340.9
2071.0     0.153    339.4
2072.0     0.157    338.0
2073.0     0.161    336.6
2074.0     0.164    335.3
2075.0     0.168    334.1
2076.0     0.172    332.9
2077.0     0.175    331.8
2078.0     0.179    330.7
2079.0     0.182    329.6
2080.0     0.185    328.6
2081.0     0.189    327.6
2082.0     0.192    326.7
2083.0     0.195    325.8
2084.0     0.197    324.9
2085.0     0.200    324.0
2086.0     0.203    323.2
2087.0     0.205    322.4
2088.0     0.207    321.6
2089.0     0.210    320.8
2090.0     0.212    320.0
2091.0     0.214    319.2
2092.0     0.215    318.5
2093.0     0.217    317.8
2094.0     0.218    317.0
2095.0     0.220    316.3
2096.0     0.221    315.6
2097.0     0.222    314.9
2098.0     0.222    314.2
2099.0     0.223    313.5
2100.0     0.224    312.9
2101.0     0.224    312.2
2102.0     0.224    311.5
2103.0     0.224    310.8
2104.0     0.224    310.1
2105.0     0.223    309.5
2106.0     0.223    308.8
2107.0     0.222    308.1
2108.0     0.221    307.4

Disclaimer

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.