Double Star Calculator - Orbit

Orbital Elements for BU218

WDS:	BU218	WDS ID/Discoverer
P:	1449.281	Orbital period (years)
a:	2.69076	Semi-major axis (arcseconds)
i:	86.131	Inclination (degrees)
Ω:	116.563	Longitude of ascending node (degrees)
T:	1785.926	Epoch of periastron passage (year)
e:	0.78317	Eccentricity
ω:	295.406	Longitude of periastron (degrees)
Start-Year:	1300.3596499999999	Year
End-Year:	2749.64035	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU218
Position:	100722.22-194231.2	Epoch-2000 right ascension and declination
WDS-ID:	10074-1943	WDS designation
Discoverer Code:	BU218	Discover designation and components
ADS number:	7647	Aitken Double Star catalog
HD number:	87840	HD catalog number
Hipparcos number:	49587	Hipparcos catalog number
V1:	8.16	Magnitude of the primary
V2:	8.21	Magnitude of the secondary
Equinox:		Equinox
Date:	1998	Date of last observation
Orbit grade:	5	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Izm2019	Reference

Double Star Orbit for BU218

WDS 6th Orbit including measures of BU218

-- 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 BU218

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.367   152.16
--------------------------
1300.36    2.719   291.56
1310.36    2.733   291.67
1320.36    2.747   291.77
1330.36    2.760   291.87
1340.36    2.771   291.96
1350.36    2.781   292.06
1360.36    2.790   292.16
1370.36    2.797   292.26
1380.36    2.803   292.35
1390.36    2.808   292.45
1400.36    2.811   292.54
1410.36    2.812   292.64
1420.36    2.812   292.73
1430.36    2.810   292.83
1440.36    2.807   292.93
1450.36    2.802   293.02
1460.36    2.794   293.12
1470.36    2.785   293.21
1480.36    2.774   293.31
1490.36    2.761   293.41
1500.36    2.745   293.51
1510.36    2.727   293.61
1520.36    2.707   293.71
1530.36    2.684   293.82
1540.36    2.659   293.92
1550.36    2.630   294.03
1560.36    2.598   294.14
1570.36    2.563   294.25
1580.36    2.525   294.37
1590.36    2.482   294.49
1600.36    2.436   294.62
1610.36    2.385   294.75
1620.36    2.330   294.88
1630.36    2.269   295.02
1640.36    2.202   295.18
1650.36    2.130   295.34
1660.36    2.050   295.51
1670.36    1.962   295.70
1680.36    1.866   295.90
1690.36    1.760   296.13
1700.36    1.642   296.39
1710.36    1.510   296.70
1720.36    1.362   297.06
1730.36    1.195   297.52
1740.36    1.005   298.15
1750.36    0.786   299.10
1760.36    0.533   300.88
1770.36    0.244   306.61
1780.36    0.086    89.05
1790.36    0.380   111.94
1800.36    0.619   115.07
1810.36    0.783   116.60
1820.36    0.887   117.68
1830.36    0.950   118.57
1840.36    0.984   119.37
1850.36    0.999   120.13
1860.36    0.998   120.89
1870.36    0.987   121.65
1880.36    0.968   122.44
1890.36    0.942   123.27
1900.36    0.911   124.15
1910.36    0.876   125.10
1920.36    0.838   126.12
1930.36    0.797   127.25
1940.36    0.755   128.51
1950.36    0.711   129.91
1960.36    0.666   131.51
1970.36    0.620   133.33
1980.36    0.573   135.46
1990.36    0.527   137.95
2000.36    0.481   140.93
2010.36    0.436   144.53
2020.36    0.393   148.94
2030.36    0.351   154.42
2040.36    0.314   161.27
2050.36    0.282   169.83
2060.36    0.257   180.29
2070.36    0.243   192.48
2080.36    0.240   205.57
2090.36    0.249   218.32
2100.36    0.269   229.64
2110.36    0.298   239.07
2120.36    0.334   246.68
2130.36    0.374   252.74
2140.36    0.417   257.60
2150.36    0.462   261.52
2160.36    0.508   264.74
2170.36    0.556   267.41
2180.36    0.604   269.66
2190.36    0.653   271.57
2200.36    0.702   273.21
2210.36    0.752   274.64
2220.36    0.801   275.90
2230.36    0.850   277.01
2240.36    0.899   277.99
2250.36    0.948   278.88
2260.36    0.997   279.67
2270.36    1.046   280.40
2280.36    1.094   281.06
2290.36    1.142   281.66
2300.36    1.190   282.22
2310.36    1.237   282.73
2320.36    1.284   283.20
2330.36    1.330   283.65
2340.36    1.376   284.06
2350.36    1.422   284.44
2360.36    1.467   284.81
2370.36    1.511   285.15
2380.36    1.556   285.47
2390.36    1.599   285.77
2400.36    1.642   286.06
2410.36    1.685   286.33
2420.36    1.727   286.59
2430.36    1.768   286.84
2440.36    1.809   287.07
2450.36    1.849   287.30
2460.36    1.889   287.51
2470.36    1.928   287.72
2480.36    1.967   287.92
2490.36    2.005   288.11
2500.36    2.042   288.30
2510.36    2.078   288.47
2520.36    2.114   288.65
2530.36    2.150   288.81
2540.36    2.184   288.97
2550.36    2.218   289.13
2560.36    2.251   289.28
2570.36    2.283   289.43
2580.36    2.315   289.57
2590.36    2.346   289.71
2600.36    2.376   289.84
2610.36    2.405   289.98
2620.36    2.433   290.10
2630.36    2.461   290.23
2640.36    2.488   290.35
2650.36    2.514   290.47
2660.36    2.539   290.59
2670.36    2.563   290.71
2680.36    2.586   290.82
2690.36    2.608   290.93
2700.36    2.629   291.04
2710.36    2.649   291.15
2720.36    2.668   291.26
2730.36    2.687   291.36
2740.36    2.704   291.47

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 16:24:28