Double Star Calculator - Orbit

Orbital Elements for BU138
WDS: BU138 WDS ID/Discoverer
P: 2105.130 Orbital period (years)
a: 6.00746 Semi-major axis (arcseconds)
i: 77.685 Inclination (degrees)
Ω: 55.543 Longitude of ascending node (degrees)
T: 1741.457 Epoch of periastron passage (year)
e: 0.8615 Eccentricity
ω: 120.766 Longitude of periastron (degrees)
Start-Year: 972.4351999999999 Year
End-Year: 3077.5648 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for BU138
Position: 191325.84-142649.3 Epoch-2000 right ascension and declination
WDS-ID: 19134-1427 WDS designation
Discoverer Code: BU138 Discover designation and components
ADS number: 12168 Aitken Double Star catalog
HD number: 179518 HD catalog number
Hipparcos number: 94454 Hipparcos catalog number
V1: 7.81 Magnitude of the primary
V2: 9.96 Magnitude of the secondary
Equinox: Equinox
Date: 1991 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 BU138



WDS 6th Orbit including measures of BU138

-- 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 BU138
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.497   343.42
--------------------------
972.44    6.805    40.33
982.44    6.817    40.48
992.44    6.828    40.62
1002.44    6.838    40.76
1012.44    6.846    40.90
1022.44    6.854    41.05
1032.44    6.860    41.19
1042.44    6.865    41.33
1052.44    6.869    41.47
1062.44    6.872    41.61
1072.44    6.874    41.76
1082.44    6.874    41.90
1092.44    6.874    42.04
1102.44    6.872    42.18
1112.44    6.868    42.32
1122.44    6.864    42.46
1132.44    6.858    42.61
1142.44    6.851    42.75
1152.44    6.842    42.89
1162.44    6.832    43.03
1172.44    6.820    43.18
1182.44    6.807    43.32
1192.44    6.793    43.47
1202.44    6.777    43.61
1212.44    6.759    43.76
1222.44    6.740    43.90
1232.44    6.719    44.05
1242.44    6.697    44.20
1252.44    6.673    44.35
1262.44    6.647    44.50
1272.44    6.619    44.65
1282.44    6.589    44.81
1292.44    6.558    44.96
1302.44    6.524    45.12
1312.44    6.489    45.27
1322.44    6.451    45.43
1332.44    6.411    45.60
1342.44    6.369    45.76
1352.44    6.325    45.92
1362.44    6.278    46.09
1372.44    6.229    46.26
1382.44    6.177    46.44
1392.44    6.123    46.61
1402.44    6.066    46.79
1412.44    6.006    46.98
1422.44    5.944    47.16
1432.44    5.878    47.36
1442.44    5.809    47.55
1452.44    5.736    47.75
1462.44    5.660    47.96
1472.44    5.581    48.17
1482.44    5.497    48.39
1492.44    5.409    48.61
1502.44    5.317    48.84
1512.44    5.221    49.09
1522.44    5.119    49.34
1532.44    5.012    49.60
1542.44    4.900    49.87
1552.44    4.782    50.15
1562.44    4.657    50.45
1572.44    4.526    50.77
1582.44    4.386    51.11
1592.44    4.239    51.47
1602.44    4.083    51.85
1612.44    3.916    52.27
1622.44    3.738    52.73
1632.44    3.548    53.23
1642.44    3.343    53.79
1652.44    3.122    54.43
1662.44    2.882    55.18
1672.44    2.619    56.06
1682.44    2.328    57.15
1692.44    2.004    58.58
1702.44    1.636    60.61
1712.44    1.215    63.95
1722.44    0.727    71.43
1732.44    0.228   114.59
1742.44    0.502   218.72
1752.44    0.934   232.44
1762.44    1.194   238.29
1772.44    1.333   242.44
1782.44    1.403   245.99
1792.44    1.432   249.31
1802.44    1.437   252.55
1812.44    1.425   255.81
1822.44    1.404   259.15
1832.44    1.377   262.60
1842.44    1.347   266.21
1852.44    1.315   269.98
1862.44    1.285   273.93
1872.44    1.257   278.07
1882.44    1.232   282.40
1892.44    1.211   286.88
1902.44    1.195   291.50
1912.44    1.185   296.23
1922.44    1.181   301.00
1932.44    1.184   305.79
1942.44    1.193   310.52
1952.44    1.209   315.16
1962.44    1.231   319.65
1972.44    1.260   323.96
1982.44    1.293   328.07
1992.44    1.332   331.95
2002.44    1.376   335.59
2012.44    1.424   339.01
2022.44    1.476   342.19
2032.44    1.530   345.15
2042.44    1.588   347.90
2052.44    1.648   350.46
2062.44    1.711   352.83
2072.44    1.775   355.03
2082.44    1.840   357.08
2092.44    1.907   358.98
2102.44    1.975     0.75
2112.44    2.044     2.41
2122.44    2.114     3.96
2132.44    2.185     5.40
2142.44    2.255     6.76
2152.44    2.327     8.03
2162.44    2.398     9.23
2172.44    2.470    10.36
2182.44    2.541    11.42
2192.44    2.613    12.43
2202.44    2.685    13.38
2212.44    2.757    14.29
2222.44    2.828    15.14
2232.44    2.899    15.96
2242.44    2.971    16.73
2252.44    3.041    17.47
2262.44    3.112    18.18
2272.44    3.182    18.86
2282.44    3.252    19.50
2292.44    3.322    20.12
2302.44    3.391    20.71
2312.44    3.459    21.28
2322.44    3.528    21.83
2332.44    3.596    22.36
2342.44    3.663    22.87
2352.44    3.730    23.36
2362.44    3.796    23.83
2372.44    3.862    24.28
2382.44    3.927    24.72
2392.44    3.992    25.15
2402.44    4.056    25.56
2412.44    4.120    25.96
2422.44    4.183    26.35
2432.44    4.246    26.73
2442.44    4.308    27.09
2452.44    4.369    27.45
2462.44    4.430    27.79
2472.44    4.491    28.13
2482.44    4.550    28.46
2492.44    4.609    28.77
2502.44    4.668    29.08
2512.44    4.725    29.39
2522.44    4.783    29.68
2532.44    4.839    29.97
2542.44    4.895    30.25
2552.44    4.950    30.53
2562.44    5.005    30.80
2572.44    5.059    31.06
2582.44    5.112    31.32
2592.44    5.165    31.58
2602.44    5.217    31.82
2612.44    5.268    32.07
2622.44    5.319    32.31
2632.44    5.369    32.54
2642.44    5.418    32.77
2652.44    5.467    32.99
2662.44    5.514    33.22
2672.44    5.562    33.43
2682.44    5.608    33.65
2692.44    5.654    33.86
2702.44    5.699    34.07
2712.44    5.743    34.27
2722.44    5.787    34.47
2732.44    5.829    34.67
2742.44    5.871    34.87
2752.44    5.913    35.06
2762.44    5.953    35.25
2772.44    5.993    35.44
2782.44    6.032    35.62
2792.44    6.070    35.80
2802.44    6.108    35.98
2812.44    6.145    36.16
2822.44    6.181    36.34
2832.44    6.216    36.51
2842.44    6.250    36.68
2852.44    6.284    36.85
2862.44    6.316    37.02
2872.44    6.348    37.19
2882.44    6.379    37.35
2892.44    6.409    37.52
2902.44    6.439    37.68
2912.44    6.467    37.84
2922.44    6.495    38.00
2932.44    6.522    38.16
2942.44    6.547    38.31
2952.44    6.572    38.47
2962.44    6.596    38.62
2972.44    6.620    38.78
2982.44    6.642    38.93
2992.44    6.663    39.08
3002.44    6.683    39.23
3012.44    6.703    39.38
3022.44    6.721    39.53
3032.44    6.739    39.67
3042.44    6.755    39.82
3052.44    6.771    39.97
3062.44    6.785    40.11
3072.44    6.799    40.26






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 18:02:01



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