Double Star Calculator - Orbit

Orbital Elements for STF2804AB
WDS: STF2804AB WDS ID/Discoverer
P: 2154.708 Orbital period (years)
a: 11.66817 Semi-major axis (arcseconds)
i: 77.8 Inclination (degrees)
Ω: 84.414 Longitude of ascending node (degrees)
T: 1630.203 Epoch of periastron passage (year)
e: 0.90363 Eccentricity
ω: 107.981 Longitude of periastron (degrees)
Start-Year: 947.6459 Year
End-Year: 3102.3541 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for STF2804AB
Position: 213258.30+204244.5 Epoch-2000 right ascension and declination
WDS-ID: 21330+2043 WDS designation
Discoverer Code: STF2804AB Discover designation and components
ADS number: 15076 Aitken Double Star catalog
HD number: 205160 HD catalog number
Hipparcos number: 106395 Hipparcos catalog number
V1: 7.70 Magnitude of the primary
V2: 8.04 Magnitude of the secondary
Equinox: Equinox
Date: 2015 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: Izm2019 Reference

Double Star Orbit for STF2804AB



WDS 6th Orbit including measures of STF2804AB

-- 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 STF2804AB
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    3.376     0.27
--------------------------
947.65    9.741    61.24
957.65    9.756    61.46
967.65    9.770    61.67
977.65    9.783    61.89
987.65    9.794    62.10
997.65    9.803    62.32
1007.65    9.811    62.53
1017.65    9.818    62.75
1027.65    9.822    62.96
1037.65    9.825    63.17
1047.65    9.826    63.39
1057.65    9.826    63.60
1067.65    9.823    63.81
1077.65    9.819    64.03
1087.65    9.813    64.24
1097.65    9.804    64.45
1107.65    9.794    64.67
1117.65    9.782    64.88
1127.65    9.767    65.10
1137.65    9.751    65.32
1147.65    9.732    65.53
1157.65    9.711    65.75
1167.65    9.687    65.97
1177.65    9.661    66.19
1187.65    9.633    66.41
1197.65    9.601    66.63
1207.65    9.568    66.86
1217.65    9.531    67.08
1227.65    9.492    67.31
1237.65    9.449    67.54
1247.65    9.404    67.77
1257.65    9.355    68.01
1267.65    9.303    68.24
1277.65    9.248    68.48
1287.65    9.189    68.72
1297.65    9.126    68.97
1307.65    9.060    69.22
1317.65    8.989    69.47
1327.65    8.914    69.73
1337.65    8.835    69.99
1347.65    8.751    70.26
1357.65    8.662    70.53
1367.65    8.567    70.80
1377.65    8.468    71.09
1387.65    8.362    71.38
1397.65    8.250    71.68
1407.65    8.132    71.98
1417.65    8.007    72.30
1427.65    7.874    72.63
1437.65    7.733    72.97
1447.65    7.583    73.32
1457.65    7.424    73.68
1467.65    7.254    74.06
1477.65    7.073    74.47
1487.65    6.880    74.89
1497.65    6.673    75.34
1507.65    6.450    75.81
1517.65    6.209    76.33
1527.65    5.948    76.89
1537.65    5.664    77.50
1547.65    5.353    78.17
1557.65    5.008    78.94
1567.65    4.623    79.83
1577.65    4.187    80.89
1587.65    3.683    82.22
1597.65    3.085    84.02
1607.65    2.346    86.84
1617.65    1.381    93.03
1627.65    0.246   167.97
1637.65    1.266   259.61
1647.65    1.964   267.51
1657.65    2.342   271.91
1667.65    2.568   275.31
1677.65    2.712   278.25
1687.65    2.806   280.95
1697.65    2.866   283.51
1707.65    2.905   285.98
1717.65    2.928   288.40
1727.65    2.939   290.79
1737.65    2.943   293.17
1747.65    2.941   295.54
1757.65    2.934   297.93
1767.65    2.926   300.33
1777.65    2.915   302.74
1787.65    2.905   305.17
1797.65    2.895   307.62
1807.65    2.885   310.09
1817.65    2.877   312.57
1827.65    2.871   315.06
1837.65    2.867   317.56
1847.65    2.866   320.07
1857.65    2.868   322.57
1867.65    2.872   325.07
1877.65    2.880   327.56
1887.65    2.891   330.04
1897.65    2.905   332.49
1907.65    2.923   334.91
1917.65    2.944   337.31
1927.65    2.969   339.66
1937.65    2.996   341.98
1947.65    3.028   344.25
1957.65    3.062   346.47
1967.65    3.099   348.64
1977.65    3.140   350.75
1987.65    3.183   352.81
1997.65    3.229   354.82
2007.65    3.278   356.76
2017.65    3.329   358.65
2027.65    3.382     0.48
2037.65    3.438     2.25
2047.65    3.496     3.96
2057.65    3.555     5.62
2067.65    3.617     7.22
2077.65    3.680     8.77
2087.65    3.745    10.26
2097.65    3.811    11.71
2107.65    3.879    13.10
2117.65    3.947    14.44
2127.65    4.017    15.74
2137.65    4.088    17.00
2147.65    4.160    18.21
2157.65    4.232    19.38
2167.65    4.306    20.51
2177.65    4.380    21.60
2187.65    4.455    22.65
2197.65    4.530    23.67
2207.65    4.606    24.66
2217.65    4.682    25.61
2227.65    4.758    26.54
2237.65    4.835    27.43
2247.65    4.912    28.30
2257.65    4.989    29.14
2267.65    5.067    29.96
2277.65    5.144    30.75
2287.65    5.222    31.51
2297.65    5.299    32.26
2307.65    5.377    32.98
2317.65    5.454    33.68
2327.65    5.532    34.36
2337.65    5.609    35.03
2347.65    5.686    35.67
2357.65    5.763    36.30
2367.65    5.840    36.91
2377.65    5.916    37.51
2387.65    5.992    38.09
2397.65    6.068    38.66
2407.65    6.144    39.21
2417.65    6.219    39.75
2427.65    6.294    40.27
2437.65    6.369    40.79
2447.65    6.443    41.29
2457.65    6.517    41.78
2467.65    6.590    42.26
2477.65    6.663    42.73
2487.65    6.735    43.19
2497.65    6.807    43.63
2507.65    6.879    44.07
2517.65    6.950    44.50
2527.65    7.020    44.93
2537.65    7.090    45.34
2547.65    7.160    45.75
2557.65    7.228    46.14
2567.65    7.297    46.53
2577.65    7.364    46.92
2587.65    7.431    47.29
2597.65    7.498    47.66
2607.65    7.563    48.03
2617.65    7.628    48.38
2627.65    7.693    48.73
2637.65    7.757    49.08
2647.65    7.820    49.42
2657.65    7.882    49.75
2667.65    7.944    50.08
2677.65    8.004    50.40
2687.65    8.065    50.72
2697.65    8.124    51.04
2707.65    8.183    51.35
2717.65    8.241    51.65
2727.65    8.298    51.95
2737.65    8.354    52.25
2747.65    8.410    52.54
2757.65    8.464    52.83
2767.65    8.518    53.12
2777.65    8.571    53.40
2787.65    8.623    53.68
2797.65    8.675    53.95
2807.65    8.725    54.23
2817.65    8.774    54.50
2827.65    8.823    54.76
2837.65    8.871    55.02
2847.65    8.917    55.28
2857.65    8.963    55.54
2867.65    9.008    55.80
2877.65    9.052    56.05
2887.65    9.095    56.30
2897.65    9.136    56.55
2907.65    9.177    56.79
2917.65    9.217    57.04
2927.65    9.255    57.28
2937.65    9.293    57.52
2947.65    9.330    57.75
2957.65    9.365    57.99
2967.65    9.399    58.22
2977.65    9.432    58.46
2987.65    9.464    58.69
2997.65    9.495    58.92
3007.65    9.524    59.14
3017.65    9.553    59.37
3027.65    9.580    59.60
3037.65    9.606    59.82
3047.65    9.630    60.04
3057.65    9.653    60.26
3067.65    9.675    60.48
3077.65    9.696    60.70
3087.65    9.715    60.92
3097.65    9.733    61.14






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 18:27:19



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