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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:38:00

Orbital Elements for BDT2AA,AB

WDS:	BDT2AA,AB	WDS ID/Discoverer
P:	8.240	Orbital period (years)
a:	0.166	Semi-major axis (arcseconds)
i:	42.47	Inclination (degrees)
Ω:	278.22	Longitude of ascending node (degrees)
T:	2008.650	Epoch of periastron passage (year)
e:	0.63	Eccentricity
ω:	347.45	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 BDT2AA,AB

Position:	080856.39+324911.4	Epoch-2000 right ascension and declination
WDS-ID:	08090+3249	WDS designation
Discoverer Code:	BDT2AA,AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	39896	Hipparcos catalog number
V1:	6.7	Magnitude of the primary
V2:	8.7	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2015	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for BDT2AA,AB

WDS 6th Orbit including measures of BDT2AA,AB

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

Ephemeris of BDT2AA,AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.058    243.2
-------------------------
2021.0     0.268     88.8
2022.0     0.259     98.6
2023.0     0.219    110.4
2024.0     0.140    131.9
2025.0     0.058    243.2
2026.0     0.101     23.4
2027.0     0.182     60.3
2028.0     0.238     75.8

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.