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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:39:02

Orbital Elements for WSI139

WDS:	WSI139	WDS ID/Discoverer
P:	14.500	Orbital period (years)
a:	0.2572	Semi-major axis (arcseconds)
i:	93.8	Inclination (degrees)
Ω:	153.3	Longitude of ascending node (degrees)
T:	2015.480	Epoch of periastron passage (year)
e:	0.23	Eccentricity
ω:	162.4	Longitude of periastron (degrees)
Start-Year:	2018.0	Year
End-Year:	2032.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for WSI139

Position:	230335.60-465047.0	Epoch-2000 right ascension and declination
WDS-ID:	23036-4651	WDS designation
Discoverer Code:	WSI139	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	13.6	Magnitude of the primary
V2:	13.7	Magnitude of the secondary
Equinox:		Equinox
Date:	2019	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for WSI139

WDS 6th Orbit including measures of WSI139

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

Ephemeris of WSI139

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.280    151.9
-------------------------
2018.0     0.080    322.4
2019.0     0.031    187.5
2020.0     0.129    161.0
2021.0     0.213    157.2
2022.0     0.274    155.4
2023.0     0.308    154.2
2024.0     0.310    153.1
2025.0     0.280    151.9
2026.0     0.216    150.2
2027.0     0.121    146.2
2028.0     0.015     71.5
2029.0     0.115    339.0
2030.0     0.190    334.4
2031.0     0.191    331.7

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.