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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:30:20

Orbital Elements for BU75AB

WDS:	BU75AB	WDS ID/Discoverer
P:	158.500	Orbital period (years)
a:	0.755	Semi-major axis (arcseconds)
i:	62.0	Inclination (degrees)
Ω:	30.2	Longitude of ascending node (degrees)
T:	1968.600	Epoch of periastron passage (year)
e:	0.61	Eccentricity
ω:	193.5	Longitude of periastron (degrees)
Start-Year:	1946.0	Year
End-Year:	2104.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU75AB

Position:	215531.42+105249.5	Epoch-2000 right ascension and declination
WDS-ID:	21555+1053	WDS designation
Discoverer Code:	BU75AB	Discover designation and components
ADS number:	15447	Aitken Double Star catalog
HD number:	208348	HD catalog number
Hipparcos number:	108228	Hipparcos catalog number
V1:	8.40	Magnitude of the primary
V2:	8.56	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 BU75AB

WDS 6th Orbit including measures of BU75AB

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

Ephemeris of BU75AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.140     28.8
-------------------------
1946.0     0.410     80.9
1947.0     0.388     83.9
1948.0     0.367     87.3
1949.0     0.346     91.1
1950.0     0.326     95.4
1951.0     0.307    100.2
1952.0     0.290    105.6
1953.0     0.275    111.6
1954.0     0.262    118.3
1955.0     0.253    125.6
1956.0     0.246    133.4
1957.0     0.243    141.4
1958.0     0.244    149.6
1959.0     0.247    157.6
1960.0     0.254    165.3
1961.0     0.262    172.5
1962.0     0.272    179.3
1963.0     0.282    185.6
1964.0     0.290    191.5
1965.0     0.297    197.0
1966.0     0.300    202.4
1967.0     0.299    207.8
1968.0     0.294    213.2
1969.0     0.283    219.0
1970.0     0.269    225.3
1971.0     0.251    232.4
1972.0     0.231    240.8
1973.0     0.213    250.5
1974.0     0.198    262.0
1975.0     0.190    274.8
1976.0     0.189    288.4
1977.0     0.196    301.5
1978.0     0.211    313.3
1979.0     0.232    323.2
1980.0     0.256    331.3
1981.0     0.284    337.9
1982.0     0.313    343.3
1983.0     0.343    347.8
1984.0     0.374    351.6
1985.0     0.404    354.8
1986.0     0.435    357.5
1987.0     0.465    359.9
1988.0     0.494      2.0
1989.0     0.523      3.8
1990.0     0.552      5.5
1991.0     0.579      7.0
1992.0     0.606      8.4
1993.0     0.632      9.6
1994.0     0.658     10.8
1995.0     0.683     11.9
1996.0     0.707     12.9
1997.0     0.731     13.8
1998.0     0.753     14.7
1999.0     0.776     15.5
2000.0     0.797     16.3
2001.0     0.818     17.0
2002.0     0.838     17.7
2003.0     0.857     18.4
2004.0     0.876     19.0
2005.0     0.894     19.6
2006.0     0.912     20.2
2007.0     0.929     20.8
2008.0     0.945     21.4
2009.0     0.961     21.9
2010.0     0.976     22.4
2011.0     0.991     22.9
2012.0     1.005     23.4
2013.0     1.019     23.9
2014.0     1.032     24.3
2015.0     1.044     24.8
2016.0     1.056     25.2
2017.0     1.067     25.6
2018.0     1.078     26.0
2019.0     1.089     26.4
2020.0     1.098     26.9
2021.0     1.108     27.2
2022.0     1.117     27.6
2023.0     1.125     28.0
2024.0     1.133     28.4
2025.0     1.140     28.8
2026.0     1.147     29.1
2027.0     1.154     29.5
2028.0     1.160     29.9
2029.0     1.165     30.2
2030.0     1.171     30.6
2031.0     1.175     30.9
2032.0     1.180     31.3
2033.0     1.183     31.6
2034.0     1.187     32.0
2035.0     1.190     32.3
2036.0     1.192     32.6
2037.0     1.194     33.0
2038.0     1.196     33.3
2039.0     1.197     33.7
2040.0     1.198     34.0
2041.0     1.198     34.3
2042.0     1.198     34.7
2043.0     1.198     35.0
2044.0     1.197     35.3
2045.0     1.195     35.7
2046.0     1.194     36.0
2047.0     1.192     36.3
2048.0     1.189     36.7
2049.0     1.186     37.0
2050.0     1.183     37.4
2051.0     1.179     37.7
2052.0     1.175     38.1
2053.0     1.170     38.4
2054.0     1.165     38.8
2055.0     1.160     39.1
2056.0     1.154     39.5
2057.0     1.148     39.8
2058.0     1.142     40.2
2059.0     1.135     40.6
2060.0     1.127     41.0
2061.0     1.120     41.3
2062.0     1.112     41.7
2063.0     1.103     42.1
2064.0     1.094     42.5
2065.0     1.085     42.9
2066.0     1.075     43.3
2067.0     1.065     43.8
2068.0     1.054     44.2
2069.0     1.044     44.6
2070.0     1.032     45.1
2071.0     1.020     45.5
2072.0     1.008     46.0
2073.0     0.996     46.5
2074.0     0.983     47.0
2075.0     0.970     47.5
2076.0     0.956     48.0
2077.0     0.942     48.5
2078.0     0.927     49.1
2079.0     0.912     49.6
2080.0     0.897     50.2
2081.0     0.881     50.8
2082.0     0.865     51.5
2083.0     0.849     52.1
2084.0     0.832     52.8
2085.0     0.814     53.5
2086.0     0.797     54.3
2087.0     0.779     55.0
2088.0     0.760     55.9
2089.0     0.741     56.7
2090.0     0.722     57.6
2091.0     0.702     58.6
2092.0     0.682     59.6
2093.0     0.662     60.6
2094.0     0.641     61.8
2095.0     0.620     63.0
2096.0     0.599     64.3
2097.0     0.577     65.7
2098.0     0.555     67.2
2099.0     0.533     68.8
2100.0     0.511     70.6
2101.0     0.489     72.5
2102.0     0.466     74.6
2103.0     0.444     76.9

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.