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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:39:41

Orbital Elements for LAB4

WDS:	LAB4	WDS ID/Discoverer
P:	7.409	Orbital period (years)
a:	0.07621	Semi-major axis (arcseconds)
i:	105.25	Inclination (degrees)
Ω:	14.95	Longitude of ascending node (degrees)
T:	1997.593	Epoch of periastron passage (year)
e:	0.5135	Eccentricity
ω:	184.97	Longitude of periastron (degrees)
Start-Year:	2022.0	Year
End-Year:	2028.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for LAB4

Position:	163406.19+422612.8	Epoch-2000 right ascension and declination
WDS-ID:	16341+4226	WDS designation
Discoverer Code:	LAB4	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	149630	HD catalog number
Hipparcos number:	81126	Hipparcos catalog number
V1:	4.20	Magnitude of the primary
V2:	7.7	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2004	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for LAB4

WDS 6th Orbit including measures of LAB4

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

Ephemeris of LAB4

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.086      4.8
-------------------------
2022.0     0.092     22.1
2023.0     0.113     16.2
2024.0     0.111     11.3
2025.0     0.086      4.8
2026.0     0.037    345.8
2027.0     0.034    204.8

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.