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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:31:08

Orbital Elements for JEF1

WDS:	JEF1	WDS ID/Discoverer
P:	10.537	Orbital period (years)
a:	0.20400800000000002	Semi-major axis (arcseconds)
i:	111.452	Inclination (degrees)
Ω:	148.041	Longitude of ascending node (degrees)
T:	1980.475	Epoch of periastron passage (year)
e:	0.53971	Eccentricity
ω:	180.21	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 JEF1

Position:	152749.85+290619.8	Epoch-2000 right ascension and declination
WDS-ID:	15278+2906	WDS designation
Discoverer Code:	JEF1	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	137909	HD catalog number
Hipparcos number:	75695	Hipparcos catalog number
V1:	3.68	Magnitude of the primary
V2:	5.2	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2008	Date of last observation
Orbit grade:	1	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for JEF1

WDS 6th Orbit including measures of JEF1

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

Ephemeris of JEF1

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.190    166.0
-------------------------
2020.0     0.210    132.5
2021.0     0.115    114.9
2022.0     0.059     13.0
2023.0     0.077    306.4
2024.0     0.090    191.1
2025.0     0.190    166.0
2026.0     0.262    157.4
2027.0     0.303    152.0
2028.0     0.314    147.5
2029.0     0.296    142.8

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.