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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:43:52

Orbital Elements for BU1118AB

WDS:	BU1118AB	WDS ID/Discoverer
P:	87.580	Orbital period (years)
a:	1.396	Semi-major axis (arcseconds)
i:	95.2	Inclination (degrees)
Ω:	38.9	Longitude of ascending node (degrees)
T:	2024.680	Epoch of periastron passage (year)
e:	0.95	Eccentricity
ω:	274.8	Longitude of periastron (degrees)
Start-Year:	1982.0	Year
End-Year:	2068.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU1118AB

Position:	171022.66-154330.5	Epoch-2000 right ascension and declination
WDS-ID:	17104-1544	WDS designation
Discoverer Code:	BU1118AB	Discover designation and components
ADS number:	10374	Aitken Double Star catalog
HD number:	155125	HD catalog number
Hipparcos number:	84012	Hipparcos catalog number
V1:	3.05	Magnitude of the primary
V2:	3.27	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2006	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BU1118AB

WDS 6th Orbit including measures of BU1118AB

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

Ephemeris of BU1118AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.143     38.1
-------------------------
1982.0     0.347    263.9
1983.0     0.358    262.1
1984.0     0.369    260.4
1985.0     0.380    258.8
1986.0     0.392    257.3
1987.0     0.403    255.8
1988.0     0.414    254.5
1989.0     0.425    253.2
1990.0     0.436    251.9
1991.0     0.447    250.8
1992.0     0.457    249.7
1993.0     0.468    248.6
1994.0     0.478    247.6
1995.0     0.488    246.6
1996.0     0.497    245.7
1997.0     0.507    244.8
1998.0     0.516    243.9
1999.0     0.524    243.1
2000.0     0.532    242.3
2001.0     0.540    241.5
2002.0     0.547    240.7
2003.0     0.554    240.0
2004.0     0.560    239.2
2005.0     0.566    238.5
2006.0     0.571    237.8
2007.0     0.575    237.1
2008.0     0.578    236.4
2009.0     0.580    235.8
2010.0     0.581    235.1
2011.0     0.581    234.4
2012.0     0.580    233.8
2013.0     0.577    233.1
2014.0     0.573    232.4
2015.0     0.567    231.7
2016.0     0.558    231.0
2017.0     0.546    230.2
2018.0     0.532    229.5
2019.0     0.512    228.6
2020.0     0.487    227.7
2021.0     0.455    226.7
2022.0     0.410    225.5
2023.0     0.345    223.9
2024.0     0.228    221.2
2025.0     0.143     38.1
2026.0     0.266     33.0
2027.0     0.310     30.3
2028.0     0.332     28.1
2029.0     0.344     26.1
2030.0     0.350     24.2
2031.0     0.352     22.4
2032.0     0.351     20.6
2033.0     0.347     18.7
2034.0     0.343     16.8
2035.0     0.337     14.8
2036.0     0.330     12.8
2037.0     0.322     10.7
2038.0     0.314      8.4
2039.0     0.306      6.1
2040.0     0.298      3.6
2041.0     0.289      0.9
2042.0     0.281    358.2
2043.0     0.273    355.2
2044.0     0.266    352.1
2045.0     0.258    348.8
2046.0     0.252    345.3
2047.0     0.246    341.6
2048.0     0.241    337.8
2049.0     0.236    333.8
2050.0     0.233    329.7
2051.0     0.230    325.4
2052.0     0.229    321.2
2053.0     0.229    316.8
2054.0     0.230    312.5
2055.0     0.232    308.2
2056.0     0.235    304.1
2057.0     0.239    300.0
2058.0     0.244    296.1
2059.0     0.250    292.4
2060.0     0.256    288.8
2061.0     0.264    285.5
2062.0     0.272    282.3
2063.0     0.280    279.4
2064.0     0.290    276.6
2065.0     0.299    273.9
2066.0     0.309    271.5
2067.0     0.320    269.2

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.