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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:14:27

Orbital Elements for BLA8

WDS:	BLA8	WDS ID/Discoverer
P:	0.157	Orbital period (years)
a:	0.0152	Semi-major axis (arcseconds)
i:	100.0	Inclination (degrees)
Ω:	330.9	Longitude of ascending node (degrees)
T:	1999.478	Epoch of periastron passage (year)
e:	0.306	Eccentricity
ω:	357.4	Longitude of periastron (degrees)
Start-Year:	2025.0	Year
End-Year:	2025.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BLA8

Position:	203251.64+415354.5	Epoch-2000 right ascension and declination
WDS-ID:	20329+4154	WDS designation
Discoverer Code:	BLA8	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	195987	HD catalog number
Hipparcos number:	101382	Hipparcos catalog number
V1:	7.4	Magnitude of the primary
V2:	9.1	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	1991	Date of last observation
Orbit grade:	5	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BLA8

WDS 6th Orbit including measures of BLA8

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

Ephemeris of BLA8

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.018    146.8
-------------------------

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.