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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:21:28

Orbital Elements for GJ538

WDS:	GJ538	WDS ID/Discoverer
P:	9.876	Orbital period (years)
a:	0.3156	Semi-major axis (arcseconds)
i:	96.9	Inclination (degrees)
Ω:	74.0	Longitude of ascending node (degrees)
T:	2011.170	Epoch of periastron passage (year)
e:	0.48	Eccentricity
ω:	183.0	Longitude of periastron (degrees)
Start-Year:	2021.0	Year
End-Year:	2029.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for GJ538

Position:	140332.35+104712.4	Epoch-2000 right ascension and declination
WDS-ID:	14035+1047	WDS designation
Discoverer Code:	GJ538	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	122742	HD catalog number
Hipparcos number:	68682	Hipparcos catalog number
V1:	6.3	Magnitude of the primary
V2:	10.0	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for GJ538

WDS 6th Orbit including measures of GJ538

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

Ephemeris of GJ538

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.444     75.4
-------------------------
2021.0     0.164    254.3
2022.0     0.028    169.7
2023.0     0.214     82.5
2024.0     0.362     77.7
2025.0     0.444     75.4
2026.0     0.466     73.6
2027.0     0.430     71.7
2028.0     0.336     69.2

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.