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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:43:26

Orbital Elements for A2131AB

WDS:	A2131AB	WDS ID/Discoverer
P:	45.020	Orbital period (years)
a:	0.347	Semi-major axis (arcseconds)
i:	43.5	Inclination (degrees)
Ω:	162.1	Longitude of ascending node (degrees)
T:	1973.160	Epoch of periastron passage (year)
e:	0.475	Eccentricity
ω:	257.5	Longitude of periastron (degrees)
Start-Year:	2003.0	Year
End-Year:	2047.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A2131AB

Position:	085455.99+261153.8	Epoch-2000 right ascension and declination
WDS-ID:	08549+2612	WDS designation
Discoverer Code:	A2131AB	Discover designation and components
ADS number:	7082	Aitken Double Star catalog
HD number:	76095	HD catalog number
Hipparcos number:	43766	Hipparcos catalog number
V1:	6.95	Magnitude of the primary
V2:	9.02	Magnitude of the secondary
Equinox:		Equinox
Date:	1997	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for A2131AB

WDS 6th Orbit including measures of A2131AB

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

Ephemeris of A2131AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.321    168.0
-------------------------
2003.0     0.349    269.1
2004.0     0.345    274.2
2005.0     0.341    279.4
2006.0     0.337    284.8
2007.0     0.332    290.3
2008.0     0.327    295.9
2009.0     0.321    301.8
2010.0     0.313    307.9
2011.0     0.303    314.4
2012.0     0.291    321.4
2013.0     0.275    329.0
2014.0     0.254    337.8
2015.0     0.228    348.4
2016.0     0.197      2.0
2017.0     0.163     21.2
2018.0     0.137     49.1
2019.0     0.136     83.3
2020.0     0.162    111.8
2021.0     0.198    131.1
2022.0     0.236    144.2
2023.0     0.269    153.9
2024.0     0.297    161.5
2025.0     0.321    168.0
2026.0     0.340    173.6
2027.0     0.356    178.6
2028.0     0.368    183.3
2029.0     0.378    187.7
2030.0     0.385    192.0
2031.0     0.390    196.1
2032.0     0.393    200.1
2033.0     0.395    204.0
2034.0     0.395    208.0
2035.0     0.395    211.9
2036.0     0.393    215.9
2037.0     0.391    219.8
2038.0     0.389    223.9
2039.0     0.385    228.0
2040.0     0.382    232.2
2041.0     0.378    236.4
2042.0     0.374    240.8
2043.0     0.370    245.2
2044.0     0.366    249.8
2045.0     0.361    254.4
2046.0     0.357    259.2

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.