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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:59:53

Orbital Elements for AST4

WDS:	AST4	WDS ID/Discoverer
P:	2.705	Orbital period (years)
a:	0.0455	Semi-major axis (arcseconds)
i:	14.0	Inclination (degrees)
Ω:	289.5	Longitude of ascending node (degrees)
T:	1999.939	Epoch of periastron passage (year)
e:	0.79	Eccentricity
ω:	149.0	Longitude of periastron (degrees)
Start-Year:	2024.0	Year
End-Year:	2026.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for AST4

Position:	042513.54+171605.5	Epoch-2000 right ascension and declination
WDS-ID:	04252+1716	WDS designation
Discoverer Code:	AST4	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	14.0	Magnitude of the primary
V2:	14.0	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for AST4

WDS 6th Orbit including measures of AST4

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

Ephemeris of AST4

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.067    241.2
-------------------------
2024.0     0.041    300.7
2025.0     0.067    241.2

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.