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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:20:49

Orbital Elements for BU163AB

WDS:	BU163AB	WDS ID/Discoverer
P:	78.540	Orbital period (years)
a:	0.5177	Semi-major axis (arcseconds)
i:	100.36	Inclination (degrees)
Ω:	255.03	Longitude of ascending node (degrees)
T:	1987.048	Epoch of periastron passage (year)
e:	0.8651	Eccentricity
ω:	171.92	Longitude of periastron (degrees)
Start-Year:	1986.0	Year
End-Year:	2064.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU163AB

Position:	211834.85+113408.2	Epoch-2000 right ascension and declination
WDS-ID:	21186+1134	WDS designation
Discoverer Code:	BU163AB	Discover designation and components
ADS number:	14839	Aitken Double Star catalog
HD number:	202908	HD catalog number
Hipparcos number:	105200	Hipparcos catalog number
V1:	7.31	Magnitude of the primary
V2:	8.88	Magnitude of the secondary
Equinox:		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 BU163AB

WDS 6th Orbit including measures of BU163AB

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

Ephemeris of BU163AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.953    256.7
-------------------------
1986.0     0.024    188.2
1987.0     0.068     77.6
1988.0     0.038     42.7
1989.0     0.052    294.5
1990.0     0.115    275.7
1991.0     0.175    270.2
1992.0     0.231    267.5
1993.0     0.282    265.8
1994.0     0.330    264.6
1995.0     0.375    263.7
1996.0     0.416    263.0
1997.0     0.455    262.4
1998.0     0.492    261.9
1999.0     0.527    261.5
2000.0     0.560    261.1
2001.0     0.591    260.8
2002.0     0.620    260.5
2003.0     0.648    260.2
2004.0     0.674    259.9
2005.0     0.699    259.7
2006.0     0.722    259.5
2007.0     0.744    259.3
2008.0     0.765    259.1
2009.0     0.785    258.9
2010.0     0.803    258.7
2011.0     0.820    258.6
2012.0     0.836    258.4
2013.0     0.851    258.2
2014.0     0.865    258.1
2015.0     0.878    258.0
2016.0     0.890    257.8
2017.0     0.901    257.7
2018.0     0.911    257.5
2019.0     0.920    257.4
2020.0     0.928    257.3
2021.0     0.935    257.1
2022.0     0.941    257.0
2023.0     0.946    256.9
2024.0     0.950    256.8
2025.0     0.953    256.7
2026.0     0.956    256.5
2027.0     0.957    256.4
2028.0     0.958    256.3
2029.0     0.957    256.2
2030.0     0.955    256.0
2031.0     0.953    255.9
2032.0     0.950    255.8
2033.0     0.945    255.7
2034.0     0.940    255.6
2035.0     0.934    255.4
2036.0     0.926    255.3
2037.0     0.918    255.2
2038.0     0.908    255.0
2039.0     0.898    254.9
2040.0     0.886    254.8
2041.0     0.873    254.6
2042.0     0.859    254.5
2043.0     0.844    254.3
2044.0     0.828    254.2
2045.0     0.810    254.0
2046.0     0.792    253.8
2047.0     0.771    253.6
2048.0     0.749    253.4
2049.0     0.726    253.2
2050.0     0.701    253.0
2051.0     0.675    252.8
2052.0     0.646    252.5
2053.0     0.616    252.3
2054.0     0.584    252.0
2055.0     0.549    251.6
2056.0     0.512    251.2
2057.0     0.472    250.8
2058.0     0.428    250.2
2059.0     0.382    249.5
2060.0     0.331    248.7
2061.0     0.275    247.4
2062.0     0.213    245.6
2063.0     0.143    241.9

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.