Double Star Calculator - Orbit

Orbital Elements for STFB11AB

WDS:	STFB11AB	WDS ID/Discoverer
P:	13500.000	Orbital period (years)
a:	21.97	Semi-major axis (arcseconds)
i:	18.0	Inclination (degrees)
Ω:	131.0	Longitude of ascending node (degrees)
T:	7315.000	Epoch of periastron passage (year)
e:	0.7	Eccentricity
ω:	351.0	Longitude of periastron (degrees)
Start-Year:	-4725.0	Year
End-Year:	8775.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STFB11AB
Position:	212205.13+194815.7	Epoch-2000 right ascension and declination
WDS-ID:	21221+1948	WDS designation
Discoverer Code:	STFB11AB	Discover designation and components
ADS number:	14909	Aitken Double Star catalog
HD number:	203504	HD catalog number
Hipparcos number:	105502	Hipparcos catalog number
V1:	4.20	Magnitude of the primary
V2:	9.3	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2011	Date of last observation
Orbit grade:	5	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	PkO2014c	Reference

Double Star Orbit for STFB11AB

WDS 6th Orbit including measures of STFB11AB

-- 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 STFB11AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50   36.107   311.81
--------------------------
-4725.00   18.086   248.48
-4625.00   18.894   251.04
-4525.00   19.680   253.39
-4425.00   20.442   255.56
-4325.00   21.182   257.58
-4225.00   21.900   259.47
-4125.00   22.597   261.23
-4025.00   23.273   262.90
-3925.00   23.929   264.46
-3825.00   24.564   265.95
-3725.00   25.180   267.36
-3625.00   25.777   268.71
-3525.00   26.355   270.00
-3425.00   26.915   271.23
-3325.00   27.457   272.41
-3225.00   27.982   273.55
-3125.00   28.489   274.65
-3025.00   28.980   275.71
-2925.00   29.454   276.73
-2825.00   29.913   277.72
-2725.00   30.355   278.69
-2625.00   30.782   279.62
-2525.00   31.194   280.53
-2425.00   31.591   281.42
-2325.00   31.973   282.28
-2225.00   32.341   283.13
-2125.00   32.694   283.96
-2025.00   33.033   284.77
-1925.00   33.358   285.56
-1825.00   33.669   286.34
-1725.00   33.967   287.10
-1625.00   34.251   287.85
-1525.00   34.521   288.59
-1425.00   34.779   289.32
-1325.00   35.024   290.04
-1225.00   35.255   290.75
-1125.00   35.474   291.44
-1025.00   35.680   292.14
-925.00   35.874   292.82
-825.00   36.055   293.49
-725.00   36.223   294.16
-625.00   36.379   294.83
-525.00   36.523   295.48
-425.00   36.655   296.14
-325.00   36.774   296.79
-225.00   36.881   297.43
-125.00   36.976   298.07
-25.00   37.060   298.71
75.00   37.131   299.35
175.00   37.190   299.98
275.00   37.237   300.61
375.00   37.272   301.24
475.00   37.295   301.87
575.00   37.306   302.50
675.00   37.305   303.12
775.00   37.292   303.75
875.00   37.267   304.38
975.00   37.231   305.01
1075.00   37.182   305.64
1175.00   37.121   306.28
1275.00   37.048   306.91
1375.00   36.963   307.55
1475.00   36.865   308.19
1575.00   36.756   308.84
1675.00   36.634   309.49
1775.00   36.500   310.14
1875.00   36.353   310.80
1975.00   36.194   311.46
2075.00   36.022   312.13
2175.00   35.837   312.81
2275.00   35.640   313.50
2375.00   35.429   314.19
2475.00   35.206   314.89
2575.00   34.969   315.60
2675.00   34.719   316.32
2775.00   34.456   317.05
2875.00   34.179   317.79
2975.00   33.888   318.55
3075.00   33.583   319.31
3175.00   33.264   320.10
3275.00   32.931   320.90
3375.00   32.583   321.71
3475.00   32.220   322.54
3575.00   31.843   323.39
3675.00   31.450   324.27
3775.00   31.041   325.16
3875.00   30.617   326.08
3975.00   30.176   327.03
4075.00   29.719   328.00
4175.00   29.246   329.01
4275.00   28.755   330.05
4375.00   28.246   331.13
4475.00   27.720   332.24
4575.00   27.175   333.40
4675.00   26.612   334.61
4775.00   26.029   335.87
4875.00   25.426   337.19
4975.00   24.804   338.58
5075.00   24.160   340.04
5175.00   23.495   341.58
5275.00   22.808   343.21
5375.00   22.098   344.94
5475.00   21.365   346.79
5575.00   20.608   348.78
5675.00   19.827   350.92
5775.00   19.020   353.24
5875.00   18.189   355.76
5975.00   17.332   358.54
6075.00   16.449     1.60
6175.00   15.541     5.02
6275.00   14.609     8.87
6375.00   13.656    13.25
6475.00   12.685    18.30
6575.00   11.702    24.19
6675.00   10.720    31.16
6775.00    9.754    39.52
6875.00    8.833    49.68
6975.00    7.997    62.08
7075.00    7.303    77.11
7175.00    6.815    94.77
7275.00    6.592   114.37
7375.00    6.656   134.44
7475.00    6.989   153.34
7575.00    7.543   170.00
7675.00    8.260   184.07
7775.00    9.086   195.74
7875.00    9.978   205.39
7975.00   10.905   213.43
8075.00   11.845   220.20
8175.00   12.784   225.97
8275.00   13.714   230.96
8375.00   14.630   235.31
8475.00   15.526   239.16
8575.00   16.402   242.59
8675.00   17.256   245.68

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 18:25:44