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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:28:14

Orbital Elements for BU1212AB

WDS:	BU1212AB	WDS ID/Discoverer
P:	48.650	Orbital period (years)
a:	0.448	Semi-major axis (arcseconds)
i:	58.0	Inclination (degrees)
Ω:	139.3	Longitude of ascending node (degrees)
T:	1971.550	Epoch of periastron passage (year)
e:	0.868	Eccentricity
ω:	293.0	Longitude of periastron (degrees)
Start-Year:	2001.0	Year
End-Year:	2049.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU1212AB

Position:	213931.39-000304.1	Epoch-2000 right ascension and declination
WDS-ID:	21395-0003	WDS designation
Discoverer Code:	BU1212AB	Discover designation and components
ADS number:	15176	Aitken Double Star catalog
HD number:	206058	HD catalog number
Hipparcos number:	106942	Hipparcos catalog number
V1:	6.94	Magnitude of the primary
V2:	8.44	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BU1212AB

WDS 6th Orbit including measures of BU1212AB

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

Ephemeris of BU1212AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.227    212.1
-------------------------
2001.0     0.542    275.0
2002.0     0.542    276.3
2003.0     0.540    277.7
2004.0     0.538    279.0
2005.0     0.534    280.4
2006.0     0.528    281.8
2007.0     0.521    283.2
2008.0     0.512    284.6
2009.0     0.501    286.2
2010.0     0.488    287.8
2011.0     0.472    289.5
2012.0     0.454    291.3
2013.0     0.432    293.3
2014.0     0.407    295.5
2015.0     0.377    298.0
2016.0     0.341    301.1
2017.0     0.296    304.9
2018.0     0.239    310.4
2019.0     0.161    320.3
2020.0     0.038     20.7
2021.0     0.111    155.8
2022.0     0.151    178.5
2023.0     0.179    192.9
2024.0     0.203    203.6
2025.0     0.227    212.1
2026.0     0.250    219.0
2027.0     0.272    224.8
2028.0     0.293    229.7
2029.0     0.313    233.9
2030.0     0.333    237.7
2031.0     0.352    241.0
2032.0     0.370    244.0
2033.0     0.387    246.7
2034.0     0.404    249.2
2035.0     0.419    251.5
2036.0     0.434    253.7
2037.0     0.448    255.7
2038.0     0.461    257.6
2039.0     0.473    259.4
2040.0     0.484    261.1
2041.0     0.494    262.7
2042.0     0.504    264.3
2043.0     0.512    265.8
2044.0     0.520    267.2
2045.0     0.526    268.7
2046.0     0.531    270.1
2047.0     0.536    271.4
2048.0     0.539    272.8

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.