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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:37:29

Orbital Elements for BU581AB

WDS:	BU581AB	WDS ID/Discoverer
P:	44.690	Orbital period (years)
a:	0.475	Semi-major axis (arcseconds)
i:	54.9	Inclination (degrees)
Ω:	113.8	Longitude of ascending node (degrees)
T:	1999.510	Epoch of periastron passage (year)
e:	0.429	Eccentricity
ω:	295.7	Longitude of periastron (degrees)
Start-Year:	2003.0	Year
End-Year:	2047.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU581AB

Position:	080423.10+121723.8	Epoch-2000 right ascension and declination
WDS-ID:	08044+1217	WDS designation
Discoverer Code:	BU581AB	Discover designation and components
ADS number:	6554	Aitken Double Star catalog
HD number:	66509	HD catalog number
Hipparcos number:	39495	Hipparcos catalog number
V1:	8.46	Magnitude of the primary
V2:	8.83	Magnitude of the secondary
Equinox:		Equinox
Date:	1997	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BU581AB

WDS 6th Orbit including measures of BU581AB

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

Ephemeris of BU581AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.507    256.5
-------------------------
2003.0     0.332    115.6
2004.0     0.353    123.6
2005.0     0.364    130.9
2006.0     0.368    137.9
2007.0     0.368    144.9
2008.0     0.365    151.9
2009.0     0.360    159.1
2010.0     0.356    166.4
2011.0     0.353    173.9
2012.0     0.352    181.5
2013.0     0.353    189.1
2014.0     0.357    196.7
2015.0     0.363    203.9
2016.0     0.373    210.9
2017.0     0.384    217.5
2018.0     0.398    223.7
2019.0     0.412    229.5
2020.0     0.428    234.8
2021.0     0.445    239.8
2022.0     0.461    244.4
2023.0     0.477    248.7
2024.0     0.492    252.7
2025.0     0.507    256.5
2026.0     0.519    260.1
2027.0     0.530    263.5
2028.0     0.539    266.8
2029.0     0.545    270.0
2030.0     0.548    273.2
2031.0     0.547    276.3
2032.0     0.543    279.5
2033.0     0.535    282.7
2034.0     0.521    286.1
2035.0     0.502    289.7
2036.0     0.477    293.6
2037.0     0.445    298.1
2038.0     0.406    303.3
2039.0     0.359    309.7
2040.0     0.305    318.3
2041.0     0.246    330.9
2042.0     0.191    351.1
2043.0     0.161     22.9
2044.0     0.176     57.9
2045.0     0.221     82.5
2046.0     0.271     98.2

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.