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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:20:06

Orbital Elements for WSI77

WDS:	WSI77	WDS ID/Discoverer
P:	10.485	Orbital period (years)
a:	0.2827	Semi-major axis (arcseconds)
i:	96.4	Inclination (degrees)
Ω:	171.3	Longitude of ascending node (degrees)
T:	2009.218	Epoch of periastron passage (year)
e:	0.3462	Eccentricity
ω:	137.5	Longitude of periastron (degrees)
Start-Year:	2020.0	Year
End-Year:	2030.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for WSI77

Position:	135120.32-242325.3	Epoch-2000 right ascension and declination
WDS-ID:	13513-2423	WDS designation
Discoverer Code:	WSI77	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	120690	HD catalog number
Hipparcos number:	67620	Hipparcos catalog number
V1:	6.45	Magnitude of the primary
V2:	9.9	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2012	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for WSI77

WDS 6th Orbit including measures of WSI77

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

Ephemeris of WSI77

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.286    176.9
-------------------------
2020.0     0.177    353.7
2021.0     0.185    346.1
2022.0     0.081    328.0
2023.0     0.073    202.4
2024.0     0.192    182.0
2025.0     0.286    176.9
2026.0     0.340    174.1
2027.0     0.339    171.6
2028.0     0.269    168.6
2029.0     0.114    159.9

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.