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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:20:24

Orbital Elements for B1909

WDS:	B1909	WDS ID/Discoverer
P:	11.350	Orbital period (years)
a:	0.202	Semi-major axis (arcseconds)
i:	69.8	Inclination (degrees)
Ω:	119.49	Longitude of ascending node (degrees)
T:	1995.090	Epoch of periastron passage (year)
e:	0.005	Eccentricity
ω:	99.0	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 B1909

Position:	002821.17-202005.2	Epoch-2000 right ascension and declination
WDS-ID:	00284-2020	WDS designation
Discoverer Code:	B1909	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	2475	HD catalog number
Hipparcos number:	2237	Hipparcos catalog number
V1:	7.23	Magnitude of the primary
V2:	7.40	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2009	Date of last observation
Orbit grade:	1	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for B1909

WDS 6th Orbit including measures of B1909

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

Ephemeris of B1909

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.175    107.0
-------------------------
2020.0     0.199    295.9
2021.0     0.190    307.2
2022.0     0.134    324.1
2023.0     0.073     13.6
2024.0     0.109     84.0
2025.0     0.175    107.0
2026.0     0.202    119.1
2027.0     0.177    131.0
2028.0     0.111    153.0
2029.0     0.071    222.4

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.