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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:38:03

Orbital Elements for BLA1AA,AB

WDS:	BLA1AA,AB	WDS ID/Discoverer
P:	8.845	Orbital period (years)
a:	0.0563	Semi-major axis (arcseconds)
i:	71.2	Inclination (degrees)
Ω:	101.0	Longitude of ascending node (degrees)
T:	1981.099	Epoch of periastron passage (year)
e:	0.337	Eccentricity
ω:	92.3	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 BLA1AA,AB

Position:	024221.92+200041.7	Epoch-2000 right ascension and declination
WDS-ID:	02424+2001	WDS designation
Discoverer Code:	BLA1AA,AB	Discover designation and components
ADS number:	2062	Aitken Double Star catalog
HD number:	16811	HD catalog number
Hipparcos number:	12640	Hipparcos catalog number
V1:	5.69	Magnitude of the primary
V2:	6.2	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	1996	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BLA1AA,AB

WDS 6th Orbit including measures of BLA1AA,AB

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

Ephemeris of BLA1AA,AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.020    135.2
-------------------------
2021.0     0.025     24.5
2022.0     0.038     68.2
2023.0     0.052     87.2
2024.0     0.051    101.1
2025.0     0.020    135.2
2026.0     0.036    269.1
2027.0     0.053    287.6
2028.0     0.045    303.3

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.