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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:55:37

Orbital Elements for COU2118

WDS:	COU2118	WDS ID/Discoverer
P:	25.200	Orbital period (years)
a:	0.143	Semi-major axis (arcseconds)
i:	37.5	Inclination (degrees)
Ω:	150.0	Longitude of ascending node (degrees)
T:	1994.610	Epoch of periastron passage (year)
e:	0.55	Eccentricity
ω:	73.0	Longitude of periastron (degrees)
Start-Year:	2013.0	Year
End-Year:	2037.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for COU2118

Position:	181205.16+464411.9	Epoch-2000 right ascension and declination
WDS-ID:	18121+4644	WDS designation
Discoverer Code:	COU2118	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	167260	HD catalog number
Hipparcos number:	89186	Hipparcos catalog number
V1:	11.07	Magnitude of the primary
V2:	8.71	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	5	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for COU2118

WDS 6th Orbit including measures of COU2118

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

Ephemeris of COU2118

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.156    352.7
-------------------------
2013.0     0.151     79.0
2014.0     0.143     87.9
2015.0     0.134     98.0
2016.0     0.123    109.8
2017.0     0.110    124.0
2018.0     0.092    143.0
2019.0     0.068    173.4
2020.0     0.052    232.6
2021.0     0.071    290.5
2022.0     0.100    317.7
2023.0     0.124    333.2
2024.0     0.142    344.0
2025.0     0.156    352.7
2026.0     0.166      0.1
2027.0     0.174      6.8
2028.0     0.178     13.1
2029.0     0.181     19.0
2030.0     0.183     24.9
2031.0     0.183     30.6
2032.0     0.181     36.5
2033.0     0.179     42.5
2034.0     0.175     48.7
2035.0     0.171     55.1
2036.0     0.165     62.0

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.