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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:16:14

Orbital Elements for LAW2

WDS:	LAW2	WDS ID/Discoverer
P:	9.680	Orbital period (years)
a:	0.15	Semi-major axis (arcseconds)
i:	49.9	Inclination (degrees)
Ω:	57.3	Longitude of ascending node (degrees)
T:	2013.612	Epoch of periastron passage (year)
e:	0.595	Eccentricity
ω:	212.2	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 LAW2

Position:	131420.12+131958.3	Epoch-2000 right ascension and declination
WDS-ID:	13143+1320	WDS designation
Discoverer Code:	LAW2	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	11.9 r	Magnitude of the primary
V2:	12.8 r	Magnitude of the secondary
Equinox:		Equinox
Date:	2021	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for LAW2

WDS 6th Orbit including measures of LAW2

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

Ephemeris of LAW2

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.158     47.1
-------------------------
2021.0     0.134    114.2
2022.0     0.089    151.3
2023.0     0.068    226.6
2024.0     0.074     12.2
2025.0     0.158     47.1
2026.0     0.204     60.1
2027.0     0.223     69.5
2028.0     0.220     78.2

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.