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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:38:53

Orbital Elements for BU1147AB

WDS:	BU1147AB	WDS ID/Discoverer
P:	73.997	Orbital period (years)
a:	0.225	Semi-major axis (arcseconds)
i:	21.7	Inclination (degrees)
Ω:	159.5	Longitude of ascending node (degrees)
T:	1870.280	Epoch of periastron passage (year)
e:	0.8	Eccentricity
ω:	356.4	Longitude of periastron (degrees)
Start-Year:	1989.0	Year
End-Year:	2061.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU1147AB

Position:	230236.34+424528.1	Epoch-2000 right ascension and declination
WDS-ID:	23026+4245	WDS designation
Discoverer Code:	BU1147AB	Discover designation and components
ADS number:	16467	Aitken Double Star catalog
HD number:	217782	HD catalog number
Hipparcos number:	113788	Hipparcos catalog number
V1:	5.19	Magnitude of the primary
V2:	7.70	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2003	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for BU1147AB

WDS 6th Orbit including measures of BU1147AB

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

Ephemeris of BU1147AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.179    292.9
-------------------------
1989.0     0.393    342.8
1990.0     0.389    343.7
1991.0     0.386    344.6
1992.0     0.381    345.5
1993.0     0.376    346.5
1994.0     0.371    347.4
1995.0     0.365    348.4
1996.0     0.359    349.5
1997.0     0.353    350.6
1998.0     0.345    351.7
1999.0     0.337    352.9
2000.0     0.329    354.1
2001.0     0.320    355.4
2002.0     0.311    356.8
2003.0     0.300    358.3
2004.0     0.290    359.9
2005.0     0.278      1.6
2006.0     0.266      3.4
2007.0     0.252      5.5
2008.0     0.238      7.7
2009.0     0.223     10.3
2010.0     0.207     13.3
2011.0     0.190     16.8
2012.0     0.172     21.0
2013.0     0.152     26.2
2014.0     0.131     33.1
2015.0     0.108     42.8
2016.0     0.084     58.0
2017.0     0.060     85.4
2018.0     0.046    137.7
2019.0     0.051    201.4
2020.0     0.071    240.5
2021.0     0.094    261.1
2022.0     0.117    273.5
2023.0     0.139    281.9
2024.0     0.160    288.1
2025.0     0.179    292.9
2026.0     0.196    296.8
2027.0     0.213    300.1
2028.0     0.228    302.9
2029.0     0.243    305.4
2030.0     0.256    307.6
2031.0     0.269    309.5
2032.0     0.281    311.4
2033.0     0.293    313.0
2034.0     0.303    314.6
2035.0     0.313    316.0
2036.0     0.322    317.4
2037.0     0.331    318.7
2038.0     0.339    319.9
2039.0     0.347    321.0
2040.0     0.354    322.2
2041.0     0.361    323.2
2042.0     0.367    324.3
2043.0     0.372    325.3
2044.0     0.378    326.3
2045.0     0.382    327.2
2046.0     0.386    328.1
2047.0     0.390    329.0
2048.0     0.393    329.9
2049.0     0.396    330.8
2050.0     0.399    331.7
2051.0     0.401    332.6
2052.0     0.402    333.4
2053.0     0.404    334.2
2054.0     0.404    335.1
2055.0     0.405    335.9
2056.0     0.405    336.8
2057.0     0.404    337.6
2058.0     0.403    338.4
2059.0     0.402    339.3
2060.0     0.401    340.1

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.