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

Double Star Calculator - Orbit

- Revision: $Rev: 1216 $
- Report created: 2025-07-11 16:22:59

Orbital Elements for A921AB
WDS: A921AB WDS ID/Discoverer
P: 120.470 Orbital period (years)
a: 0.221 Semi-major axis (arcseconds)
i: 59.6 Inclination (degrees)
Ω: 140.3 Longitude of ascending node (degrees)
T: 1982.400 Epoch of periastron passage (year)
e: 0.696 Eccentricity
ω: 96.6 Longitude of periastron (degrees)
Start-Year: 1965.0 Year
End-Year: 2085.0 Year
Epoch: 2025.0 Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A921AB
Position: 004909.10+571937.6 Epoch-2000 right ascension and declination
WDS-ID: 00492+5720 WDS designation
Discoverer Code: A921AB Discover designation and components
ADS number: 674 Aitken Double Star catalog
HD number: 236538 HD catalog number
Hipparcos number: . Hipparcos catalog number
V1: 9.0 Magnitude of the primary
V2: 9.5 Magnitude of the secondary
Equinox: 2000 Equinox
Date: 2007 Date of last observation
Orbit grade: 3 Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags: n Flags

Double Star Orbit for A921AB



WDS 6th Orbit including measures of A921AB

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


Ephemeris of A921AB
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.182     36.4
-------------------------
1965.0     0.190    118.1
1966.0     0.187    119.6
1967.0     0.183    121.2
1968.0     0.179    122.8
1969.0     0.174    124.5
1970.0     0.169    126.3
1971.0     0.163    128.2
1972.0     0.157    130.3
1973.0     0.149    132.5
1974.0     0.141    135.1
1975.0     0.132    137.9
1976.0     0.121    141.2
1977.0     0.109    145.3
1978.0     0.095    150.4
1979.0     0.079    157.5
1980.0     0.061    168.5
1981.0     0.044    188.2
1982.0     0.034    225.1
1983.0     0.040    266.6
1984.0     0.056    290.8
1985.0     0.073    303.9
1986.0     0.088    312.2
1987.0     0.101    318.2
1988.0     0.112    322.9
1989.0     0.121    326.8
1990.0     0.129    330.2
1991.0     0.135    333.3
1992.0     0.141    336.1
1993.0     0.146    338.6
1994.0     0.150    341.0
1995.0     0.154    343.3
1996.0     0.157    345.5
1997.0     0.160    347.7
1998.0     0.162    349.7
1999.0     0.164    351.7
2000.0     0.166    353.6
2001.0     0.168    355.5
2002.0     0.169    357.4
2003.0     0.170    359.3
2004.0     0.171      1.1
2005.0     0.172      2.9
2006.0     0.173      4.6
2007.0     0.174      6.4
2008.0     0.175      8.1
2009.0     0.175      9.9
2010.0     0.176     11.6
2011.0     0.176     13.3
2012.0     0.177     15.0
2013.0     0.177     16.7
2014.0     0.178     18.4
2015.0     0.178     20.1
2016.0     0.178     21.7
2017.0     0.179     23.4
2018.0     0.179     25.0
2019.0     0.180     26.7
2020.0     0.180     28.3
2021.0     0.180     30.0
2022.0     0.181     31.6
2023.0     0.181     33.2
2024.0     0.182     34.8
2025.0     0.182     36.4
2026.0     0.182     38.0
2027.0     0.183     39.6
2028.0     0.183     41.2
2029.0     0.184     42.8
2030.0     0.184     44.3
2031.0     0.185     45.9
2032.0     0.186     47.4
2033.0     0.186     49.0
2034.0     0.187     50.5
2035.0     0.188     52.0
2036.0     0.188     53.5
2037.0     0.189     55.0
2038.0     0.190     56.5
2039.0     0.190     57.9
2040.0     0.191     59.4
2041.0     0.192     60.8
2042.0     0.193     62.3
2043.0     0.194     63.7
2044.0     0.194     65.1
2045.0     0.195     66.5
2046.0     0.196     67.9
2047.0     0.197     69.3
2048.0     0.198     70.6
2049.0     0.199     72.0
2050.0     0.199     73.3
2051.0     0.200     74.6
2052.0     0.201     76.0
2053.0     0.202     77.3
2054.0     0.203     78.6
2055.0     0.203     79.9
2056.0     0.204     81.1
2057.0     0.205     82.4
2058.0     0.205     83.7
2059.0     0.206     84.9
2060.0     0.207     86.2
2061.0     0.207     87.4
2062.0     0.208     88.6
2063.0     0.208     89.9
2064.0     0.209     91.1
2065.0     0.209     92.3
2066.0     0.209     93.5
2067.0     0.210     94.7
2068.0     0.210     95.9
2069.0     0.210     97.1
2070.0     0.210     98.3
2071.0     0.210     99.5
2072.0     0.209    100.7
2073.0     0.209    102.0
2074.0     0.209    103.2
2075.0     0.208    104.4
2076.0     0.207    105.6
2077.0     0.206    106.9
2078.0     0.205    108.1
2079.0     0.204    109.4
2080.0     0.203    110.7
2081.0     0.201    112.0
2082.0     0.199    113.3
2083.0     0.197    114.6
2084.0     0.194    116.0






Disclaimer
This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. The Double Star Calculator and the results generated are licensed under CC BY-NC-SA 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.


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