Double Star Calculator - Orbit

Orbital Elements for BU1091

WDS:	BU1091	WDS ID/Discoverer
P:	1297.000	Orbital period (years)
a:	1.175	Semi-major axis (arcseconds)
i:	138.5	Inclination (degrees)
Ω:	172.9	Longitude of ascending node (degrees)
T:	1933.000	Epoch of periastron passage (year)
e:	0.896	Eccentricity
ω:	77.8	Longitude of periastron (degrees)
Start-Year:	1376.5	Year
End-Year:	2673.5	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU1091
Position:	181236.71+383551.0	Epoch-2000 right ascension and declination
WDS-ID:	18126+3836	WDS designation
Discoverer Code:	BU1091	Discover designation and components
ADS number:	11170	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	89237	Hipparcos catalog number
V1:	8.66	Magnitude of the primary
V2:	9.24	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2010	Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Zir2012b	Reference

Double Star Orbit for BU1091

WDS 6th Orbit including measures of BU1091

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

Legend:

Green plus signs:	Visual (micrometric) measures
Violet asterisks:	Photographic measures
Blue symbols:	Various interferometric techniques
Dot-dash line:	Indicates the line of nodes

Ephemeris of BU1091

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.811   316.78
--------------------------
1376.50    1.662   274.86
1386.50    1.656   274.40
1396.50    1.649   273.93
1406.50    1.642   273.46
1416.50    1.634   272.99
1426.50    1.626   272.51
1436.50    1.617   272.02
1446.50    1.608   271.53
1456.50    1.598   271.04
1466.50    1.588   270.54
1476.50    1.577   270.03
1486.50    1.566   269.51
1496.50    1.554   268.99
1506.50    1.542   268.46
1516.50    1.529   267.92
1526.50    1.515   267.37
1536.50    1.501   266.81
1546.50    1.487   266.23
1556.50    1.471   265.65
1566.50    1.456   265.06
1576.50    1.439   264.45
1586.50    1.422   263.83
1596.50    1.405   263.19
1606.50    1.387   262.53
1616.50    1.368   261.86
1626.50    1.348   261.17
1636.50    1.328   260.46
1646.50    1.307   259.72
1656.50    1.285   258.97
1666.50    1.263   258.18
1676.50    1.240   257.37
1686.50    1.216   256.52
1696.50    1.191   255.64
1706.50    1.166   254.73
1716.50    1.139   253.77
1726.50    1.112   252.76
1736.50    1.084   251.70
1746.50    1.054   250.59
1756.50    1.024   249.41
1766.50    0.992   248.15
1776.50    0.960   246.82
1786.50    0.926   245.38
1796.50    0.890   243.84
1806.50    0.854   242.16
1816.50    0.815   240.33
1826.50    0.775   238.31
1836.50    0.733   236.07
1846.50    0.689   233.55
1856.50    0.642   230.66
1866.50    0.592   227.32
1876.50    0.539   223.33
1886.50    0.482   218.43
1896.50    0.419   212.13
1906.50    0.348   203.43
1916.50    0.265   189.74
1926.50    0.158   160.06
1936.50    0.108    50.96
1946.50    0.238     0.58
1956.50    0.348   345.37
1966.50    0.439   337.08
1976.50    0.517   331.49
1986.50    0.587   327.31
1996.50    0.650   323.97
2006.50    0.708   321.21
2016.50    0.761   318.84
2026.50    0.811   316.78
2036.50    0.858   314.95
2046.50    0.902   313.31
2056.50    0.944   311.81
2066.50    0.983   310.44
2076.50    1.021   309.17
2086.50    1.056   307.98
2096.50    1.090   306.88
2106.50    1.123   305.84
2116.50    1.154   304.85
2126.50    1.183   303.92
2136.50    1.212   303.03
2146.50    1.239   302.18
2156.50    1.265   301.37
2166.50    1.290   300.59
2176.50    1.314   299.83
2186.50    1.337   299.11
2196.50    1.359   298.41
2206.50    1.380   297.73
2216.50    1.400   297.07
2226.50    1.420   296.43
2236.50    1.438   295.80
2246.50    1.456   295.19
2256.50    1.473   294.60
2266.50    1.489   294.02
2276.50    1.505   293.45
2286.50    1.520   292.89
2296.50    1.534   292.35
2306.50    1.548   291.81
2316.50    1.561   291.28
2326.50    1.573   290.76
2336.50    1.584   290.25
2346.50    1.595   289.75
2356.50    1.606   289.25
2366.50    1.616   288.76
2376.50    1.625   288.27
2386.50    1.634   287.79
2396.50    1.642   287.32
2406.50    1.649   286.85
2416.50    1.656   286.38
2426.50    1.663   285.92
2436.50    1.669   285.46
2446.50    1.674   285.00
2456.50    1.679   284.55
2466.50    1.683   284.10
2476.50    1.687   283.65
2486.50    1.690   283.20
2496.50    1.693   282.76
2506.50    1.696   282.31
2516.50    1.697   281.87
2526.50    1.699   281.43
2536.50    1.700   280.99
2546.50    1.700   280.55
2556.50    1.700   280.11
2566.50    1.699   279.67
2576.50    1.698   279.22
2586.50    1.697   278.78
2596.50    1.695   278.34
2606.50    1.692   277.89
2616.50    1.689   277.45
2626.50    1.685   277.00
2636.50    1.681   276.55
2646.50    1.677   276.10
2656.50    1.672   275.64
2666.50    1.667   275.19

Disclaimer

This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. Unless otherwise noted, all output generated by the Double Star Calculator including orbit diagrams, ephemerides, and analytical reports is licensed under CC BY 4.0.

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.

Report Information

Double Star Calculator:		Version 1.2 ($Rev: 2397 $)
Report created:		2026-06-25 17:49:19