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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:52:28

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:	1940.0	Year
End-Year:	2110.0	Year
Epoch:	2025.0	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' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for A2189

WDS 6th Orbit including measures of A2189

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

Ephemeris of A2189

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.169    298.8
-------------------------
1940.0     0.251    336.5
1941.0     0.245    337.0
1942.0     0.240    337.6
1943.0     0.234    338.2
1944.0     0.227    338.8
1945.0     0.221    339.4
1946.0     0.214    340.1
1947.0     0.207    340.8
1948.0     0.200    341.6
1949.0     0.192    342.4
1950.0     0.184    343.4
1951.0     0.176    344.3
1952.0     0.168    345.4
1953.0     0.159    346.6
1954.0     0.151    348.0
1955.0     0.141    349.5
1956.0     0.132    351.2
1957.0     0.123    353.2
1958.0     0.113    355.5
1959.0     0.103    358.3
1960.0     0.093      1.7
1961.0     0.084      5.8
1962.0     0.074     11.0
1963.0     0.065     17.8
1964.0     0.057     26.6
1965.0     0.050     38.1
1966.0     0.045     52.6
1967.0     0.044     69.1
1968.0     0.046     85.4
1969.0     0.051     99.5
1970.0     0.057    110.6
1971.0     0.065    119.2
1972.0     0.074    125.9
1973.0     0.082    131.2
1974.0     0.090    135.5
1975.0     0.098    139.2
1976.0     0.105    142.3
1977.0     0.110    145.1
1978.0     0.115    147.6
1979.0     0.119    150.0
1980.0     0.121    152.2
1981.0     0.123    154.4
1982.0     0.123    156.5
1983.0     0.123    158.7
1984.0     0.122    160.8
1985.0     0.121    163.0
1986.0     0.119    165.2
1987.0     0.116    167.6
1988.0     0.113    170.1
1989.0     0.110    172.7
1990.0     0.106    175.4
1991.0     0.103    178.4
1992.0     0.099    181.6
1993.0     0.095    185.0
1994.0     0.092    188.7
1995.0     0.088    192.7
1996.0     0.085    197.0
1997.0     0.082    201.6
1998.0     0.080    206.5
1999.0     0.078    211.7
2000.0     0.076    217.2
2001.0     0.076    222.8
2002.0     0.075    228.5
2003.0     0.076    234.1
2004.0     0.077    239.7
2005.0     0.078    245.1
2006.0     0.080    250.2
2007.0     0.083    255.0
2008.0     0.086    259.5
2009.0     0.090    263.7
2010.0     0.094    267.5
2011.0     0.098    271.0
2012.0     0.102    274.3
2013.0     0.107    277.2
2014.0     0.112    279.9
2015.0     0.117    282.4
2016.0     0.122    284.7
2017.0     0.127    286.7
2018.0     0.132    288.7
2019.0     0.137    290.4
2020.0     0.143    292.1
2021.0     0.148    293.6
2022.0     0.153    295.1
2023.0     0.158    296.4
2024.0     0.164    297.6
2025.0     0.169    298.8
2026.0     0.174    299.9
2027.0     0.179    300.9
2028.0     0.184    301.9
2029.0     0.189    302.8
2030.0     0.194    303.7
2031.0     0.199    304.5
2032.0     0.204    305.3
2033.0     0.209    306.1
2034.0     0.214    306.8
2035.0     0.218    307.5
2036.0     0.223    308.2
2037.0     0.227    308.8
2038.0     0.232    309.4
2039.0     0.236    310.0
2040.0     0.241    310.6
2041.0     0.245    311.1
2042.0     0.249    311.7
2043.0     0.253    312.2
2044.0     0.257    312.7
2045.0     0.261    313.1
2046.0     0.265    313.6
2047.0     0.268    314.1
2048.0     0.272    314.5
2049.0     0.275    314.9
2050.0     0.279    315.4
2051.0     0.282    315.8
2052.0     0.285    316.2
2053.0     0.288    316.6
2054.0     0.291    317.0
2055.0     0.294    317.3
2056.0     0.297    317.7
2057.0     0.300    318.1
2058.0     0.302    318.4
2059.0     0.305    318.8
2060.0     0.307    319.1
2061.0     0.310    319.4
2062.0     0.312    319.8
2063.0     0.314    320.1
2064.0     0.316    320.4
2065.0     0.318    320.8
2066.0     0.319    321.1
2067.0     0.321    321.4
2068.0     0.322    321.7
2069.0     0.324    322.0
2070.0     0.325    322.3
2071.0     0.326    322.6
2072.0     0.327    322.9
2073.0     0.328    323.2
2074.0     0.329    323.5
2075.0     0.330    323.8
2076.0     0.330    324.1
2077.0     0.331    324.4
2078.0     0.331    324.7
2079.0     0.331    325.0
2080.0     0.331    325.3
2081.0     0.331    325.6
2082.0     0.331    325.9
2083.0     0.330    326.2
2084.0     0.330    326.5
2085.0     0.329    326.8
2086.0     0.328    327.1
2087.0     0.327    327.4
2088.0     0.326    327.7
2089.0     0.325    328.0
2090.0     0.324    328.3
2091.0     0.322    328.6
2092.0     0.320    328.9
2093.0     0.319    329.2
2094.0     0.316    329.5
2095.0     0.314    329.9
2096.0     0.312    330.2
2097.0     0.309    330.5
2098.0     0.307    330.9
2099.0     0.304    331.2
2100.0     0.301    331.6
2101.0     0.298    331.9
2102.0     0.294    332.3
2103.0     0.291    332.7
2104.0     0.287    333.1
2105.0     0.283    333.5
2106.0     0.279    333.9
2107.0     0.274    334.3
2108.0     0.270    334.7
2109.0     0.265    335.2

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.