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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:51:00

Orbital Elements for A2909AB

WDS:	A2909AB	WDS ID/Discoverer
P:	11.350	Orbital period (years)
a:	0.172	Semi-major axis (arcseconds)
i:	71.3	Inclination (degrees)
Ω:	16.2	Longitude of ascending node (degrees)
T:	2013.740	Epoch of periastron passage (year)
e:	0.507	Eccentricity
ω:	283.0	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 A2909AB

Position:	032424.73-153913.8	Epoch-2000 right ascension and declination
WDS-ID:	03244-1539	WDS designation
Discoverer Code:	A2909AB	Discover designation and components
ADS number:	2524	Aitken Double Star catalog
HD number:	21161	HD catalog number
Hipparcos number:	15868	Hipparcos catalog number
V1:	8.4	Magnitude of the primary
V2:	8.4	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2013	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for A2909AB

WDS 6th Orbit including measures of A2909AB

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

Ephemeris of A2909AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.028    295.2
-------------------------
2020.0     0.117    154.9
2021.0     0.148    169.8
2022.0     0.169    180.0
2023.0     0.168    188.9
2024.0     0.125    200.4
2025.0     0.028    295.2
2026.0     0.118     17.3
2027.0     0.131     32.9
2028.0     0.109     50.8
2029.0     0.086     79.1

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.