Double Star Calculator - Orbit

Orbital Elements for STT81AB
WDS: STT81AB WDS ID/Discoverer
P: 1885.959 Orbital period (years)
a: 16.46579 Semi-major axis (arcseconds)
i: 100.726 Inclination (degrees)
Ω: 70.746 Longitude of ascending node (degrees)
T: 1743.571 Epoch of periastron passage (year)
e: 0.88101 Eccentricity
ω: 286.697 Longitude of periastron (degrees)
Start-Year: 1082.0203999999999 Year
End-Year: 2967.9796 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for STT81AB
Position: 042437.46+335734.9 Epoch-2000 right ascension and declination
WDS-ID: 04246+3358 WDS designation
Discoverer Code: STT81AB Discover designation and components
ADS number: 3188 Aitken Double Star catalog
HD number: 27786 HD catalog number
Hipparcos number: 20591 Hipparcos catalog number
V1: 5.84 Magnitude of the primary
V2: 9.25 Magnitude of the secondary
Equinox: Equinox
Date: 2015 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: Izm2019 Reference

Double Star Orbit for STT81AB



WDS 6th Orbit including measures of STT81AB

-- 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 STT81AB
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    4.181     9.65
--------------------------
1082.02   12.918   273.26
1092.02   12.977   272.99
1102.02   13.034   272.72
1112.02   13.088   272.45
1122.02   13.140   272.19
1132.02   13.190   271.93
1142.02   13.237   271.67
1152.02   13.281   271.41
1162.02   13.323   271.15
1172.02   13.361   270.89
1182.02   13.397   270.64
1192.02   13.430   270.38
1202.02   13.460   270.13
1212.02   13.487   269.88
1222.02   13.511   269.63
1232.02   13.532   269.38
1242.02   13.549   269.13
1252.02   13.563   268.89
1262.02   13.573   268.64
1272.02   13.580   268.39
1282.02   13.583   268.14
1292.02   13.582   267.90
1302.02   13.577   267.65
1312.02   13.568   267.40
1322.02   13.554   267.16
1332.02   13.537   266.91
1342.02   13.514   266.66
1352.02   13.487   266.41
1362.02   13.455   266.16
1372.02   13.418   265.90
1382.02   13.376   265.65
1392.02   13.328   265.39
1402.02   13.275   265.14
1412.02   13.215   264.88
1422.02   13.149   264.62
1432.02   13.077   264.35
1442.02   12.998   264.08
1452.02   12.911   263.81
1462.02   12.817   263.54
1472.02   12.715   263.26
1482.02   12.605   262.97
1492.02   12.485   262.68
1502.02   12.356   262.39
1512.02   12.217   262.08
1522.02   12.068   261.78
1532.02   11.907   261.46
1542.02   11.733   261.13
1552.02   11.546   260.80
1562.02   11.345   260.45
1572.02   11.128   260.09
1582.02   10.894   259.71
1592.02   10.641   259.32
1602.02   10.368   258.91
1612.02   10.071   258.47
1622.02    9.749   258.01
1632.02    9.397   257.51
1642.02    9.012   256.97
1652.02    8.587   256.38
1662.02    8.116   255.73
1672.02    7.589   254.99
1682.02    6.994   254.13
1692.02    6.312   253.10
1702.02    5.515   251.80
1712.02    4.559   250.00
1722.02    3.369   247.07
1732.02    1.823   239.85
1742.02    0.434   127.90
1752.02    2.104    75.78
1762.02    3.213    69.29
1772.02    3.859    65.68
1782.02    4.260    62.92
1792.02    4.519    60.57
1802.02    4.688    58.42
1812.02    4.797    56.40
1822.02    4.862    54.45
1832.02    4.896    52.54
1842.02    4.907    50.64
1852.02    4.899    48.75
1862.02    4.878    46.84
1872.02    4.846    44.91
1882.02    4.807    42.96
1892.02    4.762    40.97
1902.02    4.712    38.94
1912.02    4.661    36.86
1922.02    4.607    34.74
1932.02    4.554    32.57
1942.02    4.501    30.35
1952.02    4.450    28.07
1962.02    4.401    25.74
1972.02    4.355    23.36
1982.02    4.312    20.94
1992.02    4.274    18.47
2002.02    4.240    15.95
2012.02    4.212    13.40
2022.02    4.189    10.82
2032.02    4.172     8.21
2042.02    4.161     5.58
2052.02    4.156     2.95
2062.02    4.158     0.31
2072.02    4.167   357.68
2082.02    4.182   355.06
2092.02    4.203   352.47
2102.02    4.232   349.91
2112.02    4.266   347.38
2122.02    4.308   344.90
2132.02    4.355   342.47
2142.02    4.408   340.10
2152.02    4.467   337.78
2162.02    4.532   335.53
2172.02    4.602   333.35
2182.02    4.676   331.23
2192.02    4.756   329.18
2202.02    4.839   327.20
2212.02    4.927   325.29
2222.02    5.019   323.44
2232.02    5.114   321.67
2242.02    5.213   319.96
2252.02    5.314   318.31
2262.02    5.419   316.73
2272.02    5.525   315.21
2282.02    5.635   313.75
2292.02    5.746   312.34
2302.02    5.859   310.98
2312.02    5.975   309.68
2322.02    6.091   308.43
2332.02    6.209   307.23
2342.02    6.328   306.07
2352.02    6.449   304.95
2362.02    6.570   303.87
2372.02    6.692   302.84
2382.02    6.815   301.84
2392.02    6.939   300.87
2402.02    7.063   299.95
2412.02    7.187   299.05
2422.02    7.312   298.18
2432.02    7.436   297.34
2442.02    7.561   296.53
2452.02    7.686   295.75
2462.02    7.811   294.99
2472.02    7.936   294.25
2482.02    8.060   293.54
2492.02    8.184   292.85
2502.02    8.308   292.18
2512.02    8.432   291.53
2522.02    8.555   290.90
2532.02    8.677   290.28
2542.02    8.799   289.69
2552.02    8.921   289.11
2562.02    9.042   288.54
2572.02    9.162   287.99
2582.02    9.281   287.46
2592.02    9.399   286.93
2602.02    9.517   286.42
2612.02    9.634   285.93
2622.02    9.750   285.44
2632.02    9.864   284.97
2642.02    9.978   284.51
2652.02   10.091   284.05
2662.02   10.203   283.61
2672.02   10.314   283.18
2682.02   10.423   282.75
2692.02   10.532   282.34
2702.02   10.639   281.93
2712.02   10.745   281.53
2722.02   10.849   281.14
2732.02   10.952   280.76
2742.02   11.054   280.38
2752.02   11.155   280.01
2762.02   11.254   279.65
2772.02   11.352   279.29
2782.02   11.448   278.94
2792.02   11.542   278.60
2802.02   11.636   278.26
2812.02   11.727   277.92
2822.02   11.817   277.60
2832.02   11.905   277.27
2842.02   11.992   276.95
2852.02   12.076   276.64
2862.02   12.159   276.33
2872.02   12.240   276.02
2882.02   12.320   275.72
2892.02   12.397   275.42
2902.02   12.472   275.13
2912.02   12.546   274.83
2922.02   12.617   274.55
2932.02   12.687   274.26
2942.02   12.754   273.98
2952.02   12.819   273.70
2962.02   12.882   273.43






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 15:23:09



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