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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:29:09

Orbital Elements for BU989B

WDS:	BU989B	WDS ID/Discoverer
P:	0.016	Orbital period (years)
a:	0.00252	Semi-major axis (arcseconds)
i:	125.7	Inclination (degrees)
Ω:	244.1	Longitude of ascending node (degrees)
T:	2002.350	Epoch of periastron passage (year)
e:	0.0073	Eccentricity
ω:	359.0	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 BU989B

Position:	214438.70+253842.0	Epoch-2000 right ascension and declination
WDS-ID:	21446+2539	WDS designation
Discoverer Code:	BU989B	Discover designation and components
ADS number:	15281	Aitken Double Star catalog
HD number:	206901	HD catalog number
Hipparcos number:	107354	Hipparcos catalog number
V1:	5.04	Magnitude of the primary
V2:	.	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2007	Date of last observation
Orbit grade:	9	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BU989B

WDS 6th Orbit including measures of BU989B

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

Ephemeris of BU989B

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.002     89.5
-------------------------

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.