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

Double Star Calculator - Orbit

- Revision: $Rev: 1216 $
- Report created: 2025-07-11 19:03:43

Orbital Elements for A1391
WDS: A1391 WDS ID/Discoverer
P: 138.120 Orbital period (years)
a: 0.238 Semi-major axis (arcseconds)
i: 44.9 Inclination (degrees)
Ω: 64.4 Longitude of ascending node (degrees)
T: 1981.135 Epoch of periastron passage (year)
e: 0.401 Eccentricity
ω: 177.4 Longitude of periastron (degrees)
Start-Year: 1956.0 Year
End-Year: 2094.0 Year
Epoch: 2025.0 Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A1391
Position: 191036.61+542835.1 Epoch-2000 right ascension and declination
WDS-ID: 19106+5429 WDS designation
Discoverer Code: A1391 Discover designation and components
ADS number: 12144 Aitken Double Star catalog
HD number: 234826 HD catalog number
Hipparcos number: 94194 Hipparcos catalog number
V1: 9.17 Magnitude of the primary
V2: 10.05 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 A1391



WDS 6th Orbit including measures of A1391

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


Ephemeris of A1391
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.275     37.7
-------------------------
1956.0     0.181    121.2
1957.0     0.175    124.3
1958.0     0.169    127.5
1959.0     0.164    130.9
1960.0     0.159    134.6
1961.0     0.154    138.6
1962.0     0.149    142.8
1963.0     0.145    147.2
1964.0     0.141    151.9
1965.0     0.137    156.9
1966.0     0.135    162.1
1967.0     0.132    167.5
1968.0     0.131    173.0
1969.0     0.130    178.7
1970.0     0.129    184.4
1971.0     0.130    190.1
1972.0     0.130    195.8
1973.0     0.131    201.4
1974.0     0.133    206.8
1975.0     0.135    212.2
1976.0     0.136    217.4
1977.0     0.138    222.5
1978.0     0.139    227.5
1979.0     0.141    232.4
1980.0     0.142    237.2
1981.0     0.142    241.9
1982.0     0.143    246.6
1983.0     0.142    251.3
1984.0     0.142    256.1
1985.0     0.141    260.9
1986.0     0.140    265.7
1987.0     0.139    270.7
1988.0     0.137    275.7
1989.0     0.136    280.8
1990.0     0.135    286.1
1991.0     0.134    291.4
1992.0     0.133    296.7
1993.0     0.133    302.1
1994.0     0.133    307.5
1995.0     0.134    312.9
1996.0     0.136    318.1
1997.0     0.138    323.3
1998.0     0.140    328.2
1999.0     0.143    333.0
2000.0     0.147    337.6
2001.0     0.150    341.9
2002.0     0.155    346.0
2003.0     0.159    349.9
2004.0     0.164    353.6
2005.0     0.169    357.1
2006.0     0.174      0.3
2007.0     0.180      3.4
2008.0     0.185      6.2
2009.0     0.191      8.9
2010.0     0.197     11.5
2011.0     0.202     13.9
2012.0     0.208     16.2
2013.0     0.214     18.3
2014.0     0.219     20.4
2015.0     0.225     22.3
2016.0     0.230     24.2
2017.0     0.236     25.9
2018.0     0.241     27.6
2019.0     0.246     29.2
2020.0     0.251     30.8
2021.0     0.256     32.2
2022.0     0.261     33.7
2023.0     0.266     35.1
2024.0     0.271     36.4
2025.0     0.275     37.7
2026.0     0.279     38.9
2027.0     0.283     40.1
2028.0     0.287     41.3
2029.0     0.291     42.5
2030.0     0.295     43.6
2031.0     0.298     44.7
2032.0     0.302     45.7
2033.0     0.305     46.8
2034.0     0.308     47.8
2035.0     0.311     48.8
2036.0     0.313     49.8
2037.0     0.316     50.7
2038.0     0.318     51.7
2039.0     0.321     52.6
2040.0     0.323     53.6
2041.0     0.324     54.5
2042.0     0.326     55.4
2043.0     0.328     56.3
2044.0     0.329     57.2
2045.0     0.330     58.0
2046.0     0.331     58.9
2047.0     0.332     59.8
2048.0     0.332     60.7
2049.0     0.333     61.5
2050.0     0.333     62.4
2051.0     0.333     63.3
2052.0     0.333     64.1
2053.0     0.333     65.0
2054.0     0.333     65.8
2055.0     0.332     66.7
2056.0     0.331     67.6
2057.0     0.330     68.5
2058.0     0.329     69.3
2059.0     0.328     70.2
2060.0     0.326     71.1
2061.0     0.325     72.0
2062.0     0.323     72.9
2063.0     0.321     73.9
2064.0     0.319     74.8
2065.0     0.316     75.7
2066.0     0.314     76.7
2067.0     0.311     77.7
2068.0     0.308     78.7
2069.0     0.305     79.7
2070.0     0.302     80.8
2071.0     0.299     81.8
2072.0     0.295     82.9
2073.0     0.291     84.0
2074.0     0.287     85.2
2075.0     0.283     86.3
2076.0     0.279     87.6
2077.0     0.275     88.8
2078.0     0.270     90.1
2079.0     0.265     91.4
2080.0     0.261     92.8
2081.0     0.256     94.3
2082.0     0.250     95.7
2083.0     0.245     97.3
2084.0     0.240     98.9
2085.0     0.234    100.6
2086.0     0.229    102.4
2087.0     0.223    104.3
2088.0     0.217    106.3
2089.0     0.211    108.4
2090.0     0.205    110.6
2091.0     0.199    112.9
2092.0     0.193    115.4
2093.0     0.187    118.1






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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