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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:30:47

Orbital Elements for COU2138

WDS:	COU2138	WDS ID/Discoverer
P:	45.440	Orbital period (years)
a:	0.238	Semi-major axis (arcseconds)
i:	117.7	Inclination (degrees)
Ω:	5.1	Longitude of ascending node (degrees)
T:	2001.370	Epoch of periastron passage (year)
e:	0.028	Eccentricity
ω:	154.3	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 COU2138

Position:	215915.36+460530.8	Epoch-2000 right ascension and declination
WDS-ID:	21593+4606	WDS designation
Discoverer Code:	COU2138	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	108536	Hipparcos catalog number
V1:	9.5	Magnitude of the primary
V2:	9.8	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2007	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for COU2138

WDS 6th Orbit including measures of COU2138

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

Ephemeris of COU2138

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.234     14.1
-------------------------
2003.0     0.228    190.8
2004.0     0.231    186.8
2005.0     0.232    182.9
2006.0     0.228    179.0
2007.0     0.221    174.9
2008.0     0.211    170.4
2009.0     0.198    165.4
2010.0     0.182    159.6
2011.0     0.166    152.7
2012.0     0.149    144.3
2013.0     0.133    133.7
2014.0     0.120    120.6
2015.0     0.113    105.1
2016.0     0.113     88.6
2017.0     0.119     72.9
2018.0     0.132     59.5
2019.0     0.147     48.7
2020.0     0.165     40.1
2021.0     0.182     33.1
2022.0     0.198     27.4
2023.0     0.213     22.4
2024.0     0.225     18.1
2025.0     0.234     14.1
2026.0     0.241     10.4
2027.0     0.244      6.9
2028.0     0.243      3.4
2029.0     0.240    359.8
2030.0     0.233    356.1
2031.0     0.222    352.1
2032.0     0.209    347.6
2033.0     0.194    342.5
2034.0     0.177    336.4
2035.0     0.159    328.9
2036.0     0.141    319.6
2037.0     0.125    307.7
2038.0     0.114    293.0
2039.0     0.109    276.1
2040.0     0.112    258.9
2041.0     0.122    243.6
2042.0     0.137    231.1
2043.0     0.154    221.3
2044.0     0.172    213.4
2045.0     0.189    207.0
2046.0     0.204    201.6

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.