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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:56:29

Orbital Elements for SNA91AA,AB

WDS:	SNA91AA,AB	WDS ID/Discoverer
P:	5.027	Orbital period (years)
a:	0.007	Semi-major axis (arcseconds)
i:	105.2	Inclination (degrees)
Ω:	231.2	Longitude of ascending node (degrees)
T:	2005.422	Epoch of periastron passage (year)
e:	0.902	Eccentricity
ω:	246.7	Longitude of periastron (degrees)
Start-Year:	2023.0	Year
End-Year:	2027.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for SNA91AA,AB

Position:	181856.19-134831.1	Epoch-2000 right ascension and declination
WDS-ID:	18189-1348	WDS designation
Discoverer Code:	SNA91AA,AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	168137	HD catalog number
Hipparcos number:	89750	Hipparcos catalog number
V1:	8.3 k	Magnitude of the primary
V2:	8.6 k	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	5	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for SNA91AA,AB

WDS 6th Orbit including measures of SNA91AA,AB

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

Ephemeris of SNA91AA,AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.002    131.9
-------------------------
2023.0     0.006    200.0
2024.0     0.004    185.3
2025.0     0.002    131.9
2026.0     0.005    219.2

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.