Double Star Calculator - Orbit

Orbital Elements for B398AB
WDS: B398AB WDS ID/Discoverer
P: 47.040 Orbital period (years)
a: 0.279 Semi-major axis (arcseconds)
i: 105.2 Inclination (degrees)
Ω: 166.8 Longitude of ascending node (degrees)
T: 2013.950 Epoch of periastron passage (year)
e: 0.124 Eccentricity
ω: 133.2 Longitude of periastron (degrees)
Start-Year: 2001.48 Year
End-Year: 2048.52 Year
Epoch: 2026.5 Besselian Epoch
 
Further data from the WDS Sixth Catalog of Orbits for B398AB
Position: 184325.45-554600.8 Epoch-2000 right ascension and declination
WDS-ID: 18434-5546 WDS designation
Discoverer Code: B398AB Discover designation and components
ADS number: . Aitken Double Star catalog
HD number: 172447 HD catalog number
Hipparcos number: 91837 Hipparcos catalog number
V1: 8.07 Magnitude of the primary
V2: 9.17 Magnitude of the secondary
Equinox: 2000 Equinox
Date: 2015 Date of last observation
Orbit grade: 3 Orbit grade, ranging from :
1 = Definitive
2 = Good
3 = Reliable
4 = Preliminary
5 = Indeterminate
Flags: n Flags
Ephemerides: Ephemerides
Code: Doc2016i Reference

Double Star Orbit for B398AB



WDS 6th Orbit including measures of B398AB

-- 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 B398AB
Click to expand/collapse ephemeris: 
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.146   319.55
--------------------------
2001.48    0.264   160.15
2001.58    0.262   159.93
2001.68    0.260   159.70
2001.78    0.258   159.47
2001.88    0.256   159.24
2001.98    0.254   159.00
2002.08    0.252   158.76
2002.18    0.250   158.51
2002.28    0.248   158.26
2002.38    0.246   158.01
2002.48    0.244   157.75
2002.58    0.242   157.49
2002.68    0.240   157.22
2002.78    0.237   156.95
2002.88    0.235   156.67
2002.98    0.233   156.39
2003.08    0.230   156.10
2003.18    0.228   155.80
2003.28    0.226   155.50
2003.38    0.223   155.19
2003.48    0.221   154.88
2003.58    0.218   154.56
2003.68    0.216   154.23
2003.78    0.213   153.89
2003.88    0.211   153.55
2003.98    0.208   153.19
2004.08    0.205   152.83
2004.18    0.203   152.46
2004.28    0.200   152.07
2004.38    0.197   151.68
2004.48    0.194   151.27
2004.58    0.191   150.86
2004.68    0.189   150.43
2004.78    0.186   149.99
2004.88    0.183   149.53
2004.98    0.180   149.06
2005.08    0.177   148.57
2005.18    0.174   148.07
2005.28    0.171   147.55
2005.38    0.168   147.01
2005.48    0.165   146.45
2005.58    0.162   145.87
2005.68    0.159   145.27
2005.78    0.156   144.64
2005.88    0.153   143.99
2005.98    0.150   143.31
2006.08    0.147   142.61
2006.18    0.144   141.87
2006.28    0.140   141.10
2006.38    0.137   140.30
2006.48    0.134   139.46
2006.58    0.131   138.58
2006.68    0.128   137.65
2006.78    0.125   136.68
2006.88    0.122   135.66
2006.98    0.119   134.59
2007.08    0.116   133.46
2007.18    0.113   132.27
2007.28    0.110   131.02
2007.38    0.107   129.69
2007.48    0.104   128.29
2007.58    0.101   126.81
2007.68    0.098   125.24
2007.78    0.095   123.58
2007.88    0.092   121.82
2007.98    0.090   119.95
2008.08    0.087   117.97
2008.18    0.085   115.88
2008.28    0.082   113.66
2008.38    0.080   111.31
2008.48    0.078   108.82
2008.58    0.076   106.20
2008.68    0.074   103.45
2008.78    0.072   100.56
2008.88    0.071    97.53
2008.98    0.070    94.38
2009.08    0.068    91.12
2009.18    0.067    87.76
2009.28    0.067    84.32
2009.38    0.066    80.82
2009.48    0.066    77.28
2009.58    0.066    73.72
2009.68    0.066    70.19
2009.78    0.067    66.68
2009.88    0.067    63.24
2009.98    0.068    59.89
2010.08    0.070    56.63
2010.18    0.071    53.48
2010.28    0.072    50.46
2010.38    0.074    47.57
2010.48    0.076    44.82
2010.58    0.078    42.20
2010.68    0.080    39.72
2010.78    0.082    37.38
2010.88    0.085    35.16
2010.98    0.087    33.06
2011.08    0.090    31.08
2011.18    0.092    29.21
2011.28    0.095    27.45
2011.38    0.098    25.79
2011.48    0.101    24.22
2011.58    0.104    22.73
2011.68    0.107    21.33
2011.78    0.109    20.00
2011.88    0.112    18.74
2011.98    0.115    17.55
2012.08    0.118    16.41
2012.18    0.121    15.33
2012.28    0.124    14.31
2012.38    0.128    13.33
2012.48    0.131    12.40
2012.58    0.134    11.51
2012.68    0.137    10.66
2012.78    0.140     9.85
2012.88    0.143     9.07
2012.98    0.146     8.33
2013.08    0.149     7.61
2013.18    0.152     6.92
2013.28    0.155     6.26
2013.38    0.157     5.63
2013.48    0.160     5.01
2013.58    0.163     4.42
2013.68    0.166     3.85
2013.78    0.169     3.30
2013.88    0.172     2.76
2013.98    0.175     2.25
2014.08    0.177     1.75
2014.18    0.180     1.26
2014.28    0.183     0.79
2014.38    0.185     0.33
2014.48    0.188   359.88
2014.58    0.190   359.45
2014.68    0.193   359.03
2014.78    0.195   358.62
2014.88    0.198   358.22
2014.98    0.200   357.83
2015.08    0.203   357.44
2015.18    0.205   357.07
2015.28    0.207   356.71
2015.38    0.209   356.35
2015.48    0.211   356.00
2015.58    0.214   355.65
2015.68    0.216   355.32
2015.78    0.218   354.99
2015.88    0.220   354.66
2015.98    0.222   354.34
2016.08    0.223   354.03
2016.18    0.225   353.72
2016.28    0.227   353.42
2016.38    0.229   353.12
2016.48    0.230   352.83
2016.58    0.232   352.54
2016.68    0.233   352.25
2016.78    0.235   351.97
2016.88    0.236   351.69
2016.98    0.238   351.41
2017.08    0.239   351.14
2017.18    0.240   350.87
2017.28    0.242   350.60
2017.38    0.243   350.34
2017.48    0.244   350.08
2017.58    0.245   349.82
2017.68    0.246   349.56
2017.78    0.247   349.31
2017.88    0.248   349.05
2017.98    0.249   348.80
2018.08    0.249   348.55
2018.18    0.250   348.30
2018.28    0.251   348.06
2018.38    0.251   347.81
2018.48    0.252   347.57
2018.58    0.252   347.32
2018.68    0.253   347.08
2018.78    0.253   346.84
2018.88    0.253   346.59
2018.98    0.254   346.35
2019.08    0.254   346.11
2019.18    0.254   345.87
2019.28    0.254   345.63
2019.38    0.254   345.39
2019.48    0.254   345.15
2019.58    0.254   344.91
2019.68    0.254   344.67
2019.78    0.254   344.43
2019.88    0.254   344.19
2019.98    0.253   343.95
2020.08    0.253   343.71
2020.18    0.253   343.47
2020.28    0.252   343.22
2020.38    0.252   342.98
2020.48    0.251   342.74
2020.58    0.251   342.49
2020.68    0.250   342.24
2020.78    0.249   341.99
2020.88    0.248   341.74
2020.98    0.248   341.49
2021.08    0.247   341.24
2021.18    0.246   340.98
2021.28    0.245   340.72
2021.38    0.244   340.47
2021.48    0.243   340.20
2021.58    0.242   339.94
2021.68    0.241   339.67
2021.78    0.240   339.41
2021.88    0.238   339.14
2021.98    0.237   338.86
2022.08    0.236   338.58
2022.18    0.235   338.30
2022.28    0.233   338.02
2022.38    0.232   337.73
2022.48    0.230   337.44
2022.58    0.229   337.15
2022.68    0.227   336.85
2022.78    0.226   336.55
2022.88    0.224   336.24
2022.98    0.222   335.93
2023.08    0.221   335.61
2023.18    0.219   335.29
2023.28    0.217   334.97
2023.38    0.215   334.64
2023.48    0.213   334.30
2023.58    0.212   333.96
2023.68    0.210   333.61
2023.78    0.208   333.25
2023.88    0.206   332.89
2023.98    0.204   332.52
2024.08    0.202   332.14
2024.18    0.200   331.76
2024.28    0.198   331.36
2024.38    0.196   330.96
2024.48    0.193   330.55
2024.58    0.191   330.13
2024.68    0.189   329.71
2024.78    0.187   329.27
2024.88    0.185   328.82
2024.98    0.182   328.36
2025.08    0.180   327.89
2025.18    0.178   327.40
2025.28    0.176   326.91
2025.38    0.173   326.40
2025.48    0.171   325.87
2025.58    0.168   325.33
2025.68    0.166   324.78
2025.78    0.164   324.21
2025.88    0.161   323.62
2025.98    0.159   323.02
2026.08    0.157   322.40
2026.18    0.154   321.75
2026.28    0.152   321.09
2026.38    0.149   320.41
2026.48    0.147   319.70
2026.58    0.144   318.97
2026.68    0.142   318.21
2026.78    0.140   317.43
2026.88    0.137   316.62
2026.98    0.135   315.78
2027.08    0.132   314.91
2027.18    0.130   314.01
2027.28    0.128   313.07
2027.38    0.125   312.10
2027.48    0.123   311.09
2027.58    0.120   310.05
2027.68    0.118   308.96
2027.78    0.116   307.83
2027.88    0.114   306.65
2027.98    0.111   305.42
2028.08    0.109   304.15
2028.18    0.107   302.82
2028.28    0.105   301.44
2028.38    0.103   300.01
2028.48    0.101   298.52
2028.58    0.099   296.96
2028.68    0.097   295.35
2028.78    0.095   293.67
2028.88    0.093   291.93
2028.98    0.092   290.12
2029.08    0.090   288.25
2029.18    0.089   286.31
2029.28    0.087   284.31
2029.38    0.086   282.25
2029.48    0.085   280.12
2029.58    0.084   277.93
2029.68    0.083   275.69
2029.78    0.082   273.39
2029.88    0.081   271.05
2029.98    0.080   268.67
2030.08    0.080   266.25
2030.18    0.079   263.81
2030.28    0.079   261.35
2030.38    0.079   258.88
2030.48    0.079   256.41
2030.58    0.079   253.94
2030.68    0.080   251.49
2030.78    0.080   249.06
2030.88    0.081   246.66
2030.98    0.081   244.30
2031.08    0.082   241.99
2031.18    0.083   239.72
2031.28    0.084   237.51
2031.38    0.085   235.35
2031.48    0.087   233.26
2031.58    0.088   231.23
2031.68    0.090   229.26
2031.78    0.091   227.36
2031.88    0.093   225.52
2031.98    0.094   223.76
2032.08    0.096   222.05
2032.18    0.098   220.41
2032.28    0.100   218.83
2032.38    0.102   217.31
2032.48    0.104   215.86
2032.58    0.106   214.45
2032.68    0.108   213.11
2032.78    0.111   211.81
2032.88    0.113   210.57
2032.98    0.115   209.38
2033.08    0.117   208.23
2033.18    0.120   207.12
2033.28    0.122   206.06
2033.38    0.124   205.04
2033.48    0.127   204.06
2033.58    0.129   203.11
2033.68    0.132   202.20
2033.78    0.134   201.33
2033.88    0.137   200.48
2033.98    0.139   199.66
2034.08    0.142   198.88
2034.18    0.144   198.12
2034.28    0.147   197.38
2034.38    0.149   196.67
2034.48    0.152   195.99
2034.58    0.154   195.32
2034.68    0.157   194.68
2034.78    0.159   194.06
2034.88    0.162   193.46
2034.98    0.164   192.87
2035.08    0.167   192.31
2035.18    0.169   191.76
2035.28    0.172   191.22
2035.38    0.174   190.70
2035.48    0.177   190.20
2035.58    0.179   189.71
2035.68    0.181   189.23
2035.78    0.184   188.77
2035.88    0.186   188.31
2035.98    0.189   187.87
2036.08    0.191   187.44
2036.18    0.194   187.02
2036.28    0.196   186.62
2036.38    0.198   186.22
2036.48    0.201   185.83
2036.58    0.203   185.45
2036.68    0.205   185.07
2036.78    0.208   184.71
2036.88    0.210   184.35
2036.98    0.212   184.01
2037.08    0.214   183.66
2037.18    0.217   183.33
2037.28    0.219   183.00
2037.38    0.221   182.68
2037.48    0.223   182.37
2037.58    0.225   182.06
2037.68    0.227   181.76
2037.78    0.229   181.46
2037.88    0.232   181.17
2037.98    0.234   180.88
2038.08    0.236   180.60
2038.18    0.238   180.32
2038.28    0.240   180.05
2038.38    0.242   179.78
2038.48    0.243   179.52
2038.58    0.245   179.26
2038.68    0.247   179.00
2038.78    0.249   178.75
2038.88    0.251   178.51
2038.98    0.253   178.26
2039.08    0.254   178.02
2039.18    0.256   177.78
2039.28    0.258   177.55
2039.38    0.260   177.32
2039.48    0.261   177.09
2039.58    0.263   176.86
2039.68    0.264   176.64
2039.78    0.266   176.42
2039.88    0.268   176.20
2039.98    0.269   175.99
2040.08    0.271   175.77
2040.18    0.272   175.56
2040.28    0.273   175.35
2040.38    0.275   175.15
2040.48    0.276   174.94
2040.58    0.277   174.74
2040.68    0.279   174.54
2040.78    0.280   174.34
2040.88    0.281   174.14
2040.98    0.282   173.95
2041.08    0.284   173.76
2041.18    0.285   173.56
2041.28    0.286   173.37
2041.38    0.287   173.18
2041.48    0.288   173.00
2041.58    0.289   172.81
2041.68    0.290   172.62
2041.78    0.291   172.44
2041.88    0.292   172.26
2041.98    0.292   172.08
2042.08    0.293   171.90
2042.18    0.294   171.72
2042.28    0.295   171.54
2042.38    0.295   171.36
2042.48    0.296   171.18
2042.58    0.297   171.01
2042.68    0.297   170.83
2042.78    0.298   170.65
2042.88    0.298   170.48
2042.98    0.299   170.31
2043.08    0.299   170.13
2043.18    0.300   169.96
2043.28    0.300   169.79
2043.38    0.300   169.62
2043.48    0.301   169.44
2043.58    0.301   169.27
2043.68    0.301   169.10
2043.78    0.301   168.93
2043.88    0.301   168.76
2043.98    0.302   168.59
2044.08    0.302   168.42
2044.18    0.302   168.25
2044.28    0.302   168.08
2044.38    0.302   167.91
2044.48    0.301   167.74
2044.58    0.301   167.57
2044.68    0.301   167.40
2044.78    0.301   167.23
2044.88    0.301   167.05
2044.98    0.300   166.88
2045.08    0.300   166.71
2045.18    0.300   166.54
2045.28    0.299   166.37
2045.38    0.299   166.19
2045.48    0.298   166.02
2045.58    0.298   165.84
2045.68    0.297   165.67
2045.78    0.296   165.49
2045.88    0.296   165.32
2045.98    0.295   165.14
2046.08    0.294   164.96
2046.18    0.294   164.78
2046.28    0.293   164.60
2046.38    0.292   164.42
2046.48    0.291   164.24
2046.58    0.290   164.05
2046.68    0.289   163.87
2046.78    0.288   163.68
2046.88    0.287   163.49
2046.98    0.286   163.30
2047.08    0.285   163.11
2047.18    0.283   162.92
2047.28    0.282   162.73
2047.38    0.281   162.53
2047.48    0.280   162.34
2047.58    0.278   162.14
2047.68    0.277   161.94
2047.78    0.275   161.73
2047.88    0.274   161.53
2047.98    0.272   161.32
2048.08    0.271   161.11
2048.18    0.269   160.90
2048.28    0.268   160.68
2048.38    0.266   160.46
2048.48    0.264   160.24



 

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 17:54:15


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