Double Star Calculator - Orbit

Orbital Elements for STF1998AB
WDS: STF1998AB WDS ID/Discoverer
P: 45.900 Orbital period (years)
a: 0.654 Semi-major axis (arcseconds)
i: 34.5 Inclination (degrees)
Ω: 25.3 Longitude of ascending node (degrees)
T: 1997.220 Epoch of periastron passage (year)
e: 0.744 Eccentricity
ω: 163.8 Longitude of periastron (degrees)
Start-Year: 2002.05 Year
End-Year: 2047.95 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for STF1998AB
Position: 160422.13-112223.2 Epoch-2000 right ascension and declination
WDS-ID: 16044-1122 WDS designation
Discoverer Code: STF1998AB Discover designation and components
ADS number: 9909 Aitken Double Star catalog
HD number: 144069J HD catalog number
Hipparcos number: 78727 Hipparcos catalog number
V1: 5.16 Magnitude of the primary
V2: 4.87 Magnitude of the secondary
Equinox: 2000 Equinox
Date: 2006 Date of last observation
Orbit grade: 1 Orbit grade, ranging from :
1 = Definitive
2 = Good
3 = Reliable
4 = Preliminary
5 = Indeterminate
Flags: n Flags
Ephemerides: Ephemerides
Code: Doc2009g Reference

Double Star Orbit for STF1998AB



WDS 6th Orbit including measures of STF1998AB

-- 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 STF1998AB
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.078    21.27
--------------------------
2002.05    0.487   324.35
2002.15    0.494   325.12
2002.25    0.502   325.86
2002.35    0.509   326.58
2002.45    0.516   327.29
2002.55    0.524   327.97
2002.65    0.531   328.63
2002.75    0.538   329.28
2002.85    0.545   329.91
2002.95    0.552   330.53
2003.05    0.559   331.12
2003.15    0.566   331.71
2003.25    0.573   332.28
2003.35    0.579   332.84
2003.45    0.586   333.38
2003.55    0.593   333.91
2003.65    0.600   334.43
2003.75    0.606   334.94
2003.85    0.613   335.44
2003.95    0.619   335.92
2004.05    0.626   336.40
2004.15    0.632   336.87
2004.25    0.638   337.32
2004.35    0.645   337.77
2004.45    0.651   338.21
2004.55    0.657   338.65
2004.65    0.663   339.07
2004.75    0.669   339.49
2004.85    0.675   339.89
2004.95    0.681   340.30
2005.05    0.687   340.69
2005.15    0.693   341.08
2005.25    0.699   341.46
2005.35    0.705   341.83
2005.45    0.710   342.20
2005.55    0.716   342.57
2005.65    0.722   342.92
2005.75    0.727   343.28
2005.85    0.733   343.62
2005.95    0.738   343.96
2006.05    0.744   344.30
2006.15    0.749   344.63
2006.25    0.755   344.96
2006.35    0.760   345.28
2006.45    0.765   345.60
2006.55    0.770   345.91
2006.65    0.776   346.22
2006.75    0.781   346.52
2006.85    0.786   346.83
2006.95    0.791   347.12
2007.05    0.796   347.42
2007.15    0.801   347.71
2007.25    0.806   347.99
2007.35    0.811   348.28
2007.45    0.815   348.55
2007.55    0.820   348.83
2007.65    0.825   349.10
2007.75    0.830   349.37
2007.85    0.834   349.64
2007.95    0.839   349.90
2008.05    0.844   350.17
2008.15    0.848   350.42
2008.25    0.853   350.68
2008.35    0.857   350.93
2008.45    0.861   351.18
2008.55    0.866   351.43
2008.65    0.870   351.68
2008.75    0.874   351.92
2008.85    0.879   352.16
2008.95    0.883   352.40
2009.05    0.887   352.63
2009.15    0.891   352.87
2009.25    0.895   353.10
2009.35    0.899   353.33
2009.45    0.903   353.55
2009.55    0.907   353.78
2009.65    0.911   354.00
2009.75    0.915   354.23
2009.85    0.919   354.45
2009.95    0.923   354.66
2010.05    0.926   354.88
2010.15    0.930   355.09
2010.25    0.934   355.31
2010.35    0.937   355.52
2010.45    0.941   355.73
2010.55    0.945   355.93
2010.65    0.948   356.14
2010.75    0.952   356.35
2010.85    0.955   356.55
2010.95    0.959   356.75
2011.05    0.962   356.95
2011.15    0.965   357.15
2011.25    0.969   357.35
2011.35    0.972   357.54
2011.45    0.975   357.74
2011.55    0.978   357.93
2011.65    0.982   358.12
2011.75    0.985   358.32
2011.85    0.988   358.51
2011.95    0.991   358.69
2012.05    0.994   358.88
2012.15    0.997   359.07
2012.25    1.000   359.25
2012.35    1.003   359.44
2012.45    1.006   359.62
2012.55    1.008   359.80
2012.65    1.011   359.98
2012.75    1.014     0.16
2012.85    1.017     0.34
2012.95    1.019     0.52
2013.05    1.022     0.70
2013.15    1.025     0.88
2013.25    1.027     1.05
2013.35    1.030     1.23
2013.45    1.032     1.40
2013.55    1.035     1.57
2013.65    1.037     1.74
2013.75    1.040     1.92
2013.85    1.042     2.09
2013.95    1.045     2.26
2014.05    1.047     2.42
2014.15    1.049     2.59
2014.25    1.051     2.76
2014.35    1.054     2.93
2014.45    1.056     3.09
2014.55    1.058     3.26
2014.65    1.060     3.42
2014.75    1.062     3.59
2014.85    1.064     3.75
2014.95    1.066     3.91
2015.05    1.068     4.08
2015.15    1.070     4.24
2015.25    1.072     4.40
2015.35    1.074     4.56
2015.45    1.076     4.72
2015.55    1.078     4.88
2015.65    1.080     5.04
2015.75    1.081     5.19
2015.85    1.083     5.35
2015.95    1.085     5.51
2016.05    1.086     5.67
2016.15    1.088     5.82
2016.25    1.090     5.98
2016.35    1.091     6.13
2016.45    1.093     6.29
2016.55    1.094     6.44
2016.65    1.096     6.60
2016.75    1.097     6.75
2016.85    1.098     6.90
2016.95    1.100     7.06
2017.05    1.101     7.21
2017.15    1.102     7.36
2017.25    1.104     7.51
2017.35    1.105     7.67
2017.45    1.106     7.82
2017.55    1.107     7.97
2017.65    1.108     8.12
2017.75    1.110     8.27
2017.85    1.111     8.42
2017.95    1.112     8.57
2018.05    1.113     8.72
2018.15    1.114     8.87
2018.25    1.115     9.01
2018.35    1.115     9.16
2018.45    1.116     9.31
2018.55    1.117     9.46
2018.65    1.118     9.61
2018.75    1.119     9.76
2018.85    1.119     9.90
2018.95    1.120    10.05
2019.05    1.121    10.20
2019.15    1.122    10.34
2019.25    1.122    10.49
2019.35    1.123    10.64
2019.45    1.123    10.78
2019.55    1.124    10.93
2019.65    1.124    11.08
2019.75    1.125    11.22
2019.85    1.125    11.37
2019.95    1.126    11.51
2020.05    1.126    11.66
2020.15    1.126    11.81
2020.25    1.126    11.95
2020.35    1.127    12.10
2020.45    1.127    12.24
2020.55    1.127    12.39
2020.65    1.127    12.53
2020.75    1.127    12.68
2020.85    1.128    12.82
2020.95    1.128    12.97
2021.05    1.128    13.11
2021.15    1.128    13.26
2021.25    1.128    13.41
2021.35    1.127    13.55
2021.45    1.127    13.70
2021.55    1.127    13.84
2021.65    1.127    13.99
2021.75    1.127    14.13
2021.85    1.127    14.28
2021.95    1.126    14.42
2022.05    1.126    14.57
2022.15    1.126    14.71
2022.25    1.125    14.86
2022.35    1.125    15.01
2022.45    1.125    15.15
2022.55    1.124    15.30
2022.65    1.124    15.44
2022.75    1.123    15.59
2022.85    1.122    15.74
2022.95    1.122    15.88
2023.05    1.121    16.03
2023.15    1.121    16.18
2023.25    1.120    16.33
2023.35    1.119    16.47
2023.45    1.118    16.62
2023.55    1.118    16.77
2023.65    1.117    16.92
2023.75    1.116    17.06
2023.85    1.115    17.21
2023.95    1.114    17.36
2024.05    1.113    17.51
2024.15    1.112    17.66
2024.25    1.111    17.81
2024.35    1.110    17.96
2024.45    1.109    18.11
2024.55    1.108    18.26
2024.65    1.107    18.41
2024.75    1.105    18.56
2024.85    1.104    18.71
2024.95    1.103    18.86
2025.05    1.101    19.02
2025.15    1.100    19.17
2025.25    1.099    19.32
2025.35    1.097    19.47
2025.45    1.096    19.63
2025.55    1.094    19.78
2025.65    1.093    19.94
2025.75    1.091    20.09
2025.85    1.090    20.25
2025.95    1.088    20.40
2026.05    1.086    20.56
2026.15    1.085    20.72
2026.25    1.083    20.87
2026.35    1.081    21.03
2026.45    1.079    21.19
2026.55    1.077    21.35
2026.65    1.076    21.51
2026.75    1.074    21.67
2026.85    1.072    21.83
2026.95    1.070    21.99
2027.05    1.068    22.15
2027.15    1.066    22.31
2027.25    1.063    22.48
2027.35    1.061    22.64
2027.45    1.059    22.80
2027.55    1.057    22.97
2027.65    1.055    23.14
2027.75    1.052    23.30
2027.85    1.050    23.47
2027.95    1.048    23.64
2028.05    1.045    23.81
2028.15    1.043    23.98
2028.25    1.040    24.15
2028.35    1.038    24.32
2028.45    1.035    24.49
2028.55    1.032    24.66
2028.65    1.030    24.84
2028.75    1.027    25.01
2028.85    1.024    25.19
2028.95    1.022    25.36
2029.05    1.019    25.54
2029.15    1.016    25.72
2029.25    1.013    25.90
2029.35    1.010    26.08
2029.45    1.007    26.26
2029.55    1.004    26.44
2029.65    1.001    26.63
2029.75    0.998    26.81
2029.85    0.995    27.00
2029.95    0.992    27.18
2030.05    0.988    27.37
2030.15    0.985    27.56
2030.25    0.982    27.75
2030.35    0.978    27.95
2030.45    0.975    28.14
2030.55    0.972    28.33
2030.65    0.968    28.53
2030.75    0.965    28.73
2030.85    0.961    28.93
2030.95    0.957    29.13
2031.05    0.954    29.33
2031.15    0.950    29.54
2031.25    0.946    29.74
2031.35    0.942    29.95
2031.45    0.938    30.16
2031.55    0.935    30.37
2031.65    0.931    30.58
2031.75    0.927    30.79
2031.85    0.923    31.01
2031.95    0.919    31.23
2032.05    0.914    31.45
2032.15    0.910    31.67
2032.25    0.906    31.89
2032.35    0.902    32.12
2032.45    0.897    32.35
2032.55    0.893    32.58
2032.65    0.889    32.81
2032.75    0.884    33.05
2032.85    0.879    33.28
2032.95    0.875    33.52
2033.05    0.870    33.77
2033.15    0.866    34.01
2033.25    0.861    34.26
2033.35    0.856    34.51
2033.45    0.851    34.76
2033.55    0.846    35.02
2033.65    0.841    35.28
2033.75    0.836    35.54
2033.85    0.831    35.81
2033.95    0.826    36.08
2034.05    0.821    36.35
2034.15    0.816    36.63
2034.25    0.810    36.91
2034.35    0.805    37.19
2034.45    0.800    37.48
2034.55    0.794    37.77
2034.65    0.789    38.06
2034.75    0.783    38.36
2034.85    0.777    38.67
2034.95    0.772    38.97
2035.05    0.766    39.29
2035.15    0.760    39.60
2035.25    0.754    39.93
2035.35    0.748    40.25
2035.45    0.742    40.59
2035.55    0.736    40.92
2035.65    0.730    41.27
2035.75    0.724    41.62
2035.85    0.717    41.97
2035.95    0.711    42.34
2036.05    0.704    42.71
2036.15    0.698    43.08
2036.25    0.691    43.46
2036.35    0.685    43.85
2036.45    0.678    44.25
2036.55    0.671    44.66
2036.65    0.664    45.07
2036.75    0.657    45.50
2036.85    0.650    45.93
2036.95    0.643    46.37
2037.05    0.636    46.82
2037.15    0.629    47.28
2037.25    0.622    47.75
2037.35    0.614    48.24
2037.45    0.607    48.73
2037.55    0.599    49.24
2037.65    0.591    49.76
2037.75    0.584    50.30
2037.85    0.576    50.85
2037.95    0.568    51.41
2038.05    0.560    51.99
2038.15    0.552    52.59
2038.25    0.544    53.21
2038.35    0.536    53.84
2038.45    0.527    54.50
2038.55    0.519    55.17
2038.65    0.510    55.87
2038.75    0.502    56.59
2038.85    0.493    57.34
2038.95    0.484    58.11
2039.05    0.475    58.92
2039.15    0.466    59.75
2039.25    0.457    60.62
2039.35    0.448    61.52
2039.45    0.439    62.46
2039.55    0.429    63.44
2039.65    0.420    64.46
2039.75    0.410    65.53
2039.85    0.401    66.66
2039.95    0.391    67.83
2040.05    0.381    69.07
2040.15    0.372    70.38
2040.25    0.362    71.75
2040.35    0.352    73.20
2040.45    0.342    74.74
2040.55    0.331    76.37
2040.65    0.321    78.11
2040.75    0.311    79.96
2040.85    0.301    81.93
2040.95    0.291    84.04
2041.05    0.281    86.31
2041.15    0.270    88.74
2041.25    0.260    91.36
2041.35    0.250    94.20
2041.45    0.241    97.26
2041.55    0.231   100.58
2041.65    0.222   104.18
2041.75    0.213   108.09
2041.85    0.205   112.33
2041.95    0.197   116.92
2042.05    0.189   121.89
2042.15    0.183   127.24
2042.25    0.177   132.97
2042.35    0.172   139.06
2042.45    0.168   145.48
2042.55    0.165   152.16
2042.65    0.163   159.05
2042.75    0.162   166.06
2042.85    0.162   173.11
2042.95    0.163   180.13
2043.05    0.164   187.06
2043.15    0.166   193.86
2043.25    0.168   200.47
2043.35    0.171   206.89
2043.45    0.174   213.10
2043.55    0.177   219.09
2043.65    0.181   224.86
2043.75    0.185   230.39
2043.85    0.189   235.70
2043.95    0.193   240.77
2044.05    0.198   245.61
2044.15    0.203   250.22
2044.25    0.208   254.59
2044.35    0.214   258.74
2044.45    0.220   262.67
2044.55    0.226   266.39
2044.65    0.232   269.91
2044.75    0.239   273.23
2044.85    0.246   276.37
2044.95    0.253   279.33
2045.05    0.261   282.13
2045.15    0.268   284.78
2045.25    0.275   287.28
2045.35    0.283   289.65
2045.45    0.291   291.89
2045.55    0.299   294.02
2045.65    0.307   296.04
2045.75    0.315   297.95
2045.85    0.322   299.77
2045.95    0.330   301.51
2046.05    0.339   303.16
2046.15    0.347   304.73
2046.25    0.355   306.24
2046.35    0.363   307.67
2046.45    0.371   309.05
2046.55    0.379   310.36
2046.65    0.387   311.63
2046.75    0.395   312.84
2046.85    0.402   314.00
2046.95    0.410   315.12
2047.05    0.418   316.20
2047.15    0.426   317.23
2047.25    0.434   318.23
2047.35    0.442   319.20
2047.45    0.449   320.13
2047.55    0.457   321.03
2047.65    0.464   321.90
2047.75    0.472   322.74
2047.85    0.480   323.56
2047.95    0.487   324.35






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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.


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Double Star Calculator: Version 1.2 ($Rev: 2397 $)
Report created: 2026-06-25 17:22:00



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