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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:33:05

Orbital Elements for HDS2211AB

WDS:	HDS2211AB	WDS ID/Discoverer
P:	79.500	Orbital period (years)
a:	0.592	Semi-major axis (arcseconds)
i:	136.6	Inclination (degrees)
Ω:	272.8	Longitude of ascending node (degrees)
T:	2042.600	Epoch of periastron passage (year)
e:	0.679	Eccentricity
ω:	49.3	Longitude of periastron (degrees)
Start-Year:	1986.0	Year
End-Year:	2064.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS2211AB

Position:	154028.43-184144.8	Epoch-2000 right ascension and declination
WDS-ID:	15405-1842	WDS designation
Discoverer Code:	HDS2211AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	139751	HD catalog number
Hipparcos number:	76768	Hipparcos catalog number
V1:	10.52	Magnitude of the primary
V2:	11.85	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS2211AB

WDS 6th Orbit including measures of HDS2211AB

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

Ephemeris of HDS2211AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.560     15.8
-------------------------
1986.0     0.819     72.1
1987.0     0.828     70.9
1988.0     0.837     69.6
1989.0     0.845     68.4
1990.0     0.851     67.3
1991.0     0.856     66.1
1992.0     0.861     64.9
1993.0     0.864     63.8
1994.0     0.866     62.7
1995.0     0.868     61.6
1996.0     0.868     60.4
1997.0     0.868     59.3
1998.0     0.866     58.2
1999.0     0.864     57.0
2000.0     0.861     55.9
2001.0     0.857     54.8
2002.0     0.853     53.6
2003.0     0.848     52.4
2004.0     0.842     51.2
2005.0     0.835     50.0
2006.0     0.827     48.8
2007.0     0.819     47.6
2008.0     0.810     46.3
2009.0     0.800     45.0
2010.0     0.790     43.6
2011.0     0.779     42.3
2012.0     0.767     40.9
2013.0     0.755     39.4
2014.0     0.742     37.9
2015.0     0.728     36.3
2016.0     0.714     34.7
2017.0     0.699     33.0
2018.0     0.683     31.2
2019.0     0.667     29.4
2020.0     0.651     27.4
2021.0     0.634     25.4
2022.0     0.616     23.2
2023.0     0.598     20.9
2024.0     0.579     18.4
2025.0     0.560     15.8
2026.0     0.541     13.0
2027.0     0.521     10.0
2028.0     0.501      6.8
2029.0     0.480      3.3
2030.0     0.460    359.4
2031.0     0.439    355.3
2032.0     0.418    350.6
2033.0     0.398    345.6
2034.0     0.377    339.9
2035.0     0.357    333.6
2036.0     0.337    326.6
2037.0     0.316    318.6
2038.0     0.296    309.6
2039.0     0.273    299.1
2040.0     0.248    286.7
2041.0     0.218    271.1
2042.0     0.182    249.9
2043.0     0.153    218.9
2044.0     0.154    181.1
2045.0     0.192    151.7
2046.0     0.245    133.6
2047.0     0.300    122.1
2048.0     0.354    114.1
2049.0     0.403    108.2
2050.0     0.448    103.5
2051.0     0.490     99.7
2052.0     0.528     96.4
2053.0     0.563     93.5
2054.0     0.595     91.0
2055.0     0.625     88.7
2056.0     0.652     86.7
2057.0     0.677     84.8
2058.0     0.700     83.0
2059.0     0.721     81.3
2060.0     0.740     79.7
2061.0     0.758     78.2
2062.0     0.774     76.8
2063.0     0.788     75.4

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.