Double Star Calculator - Orbit

Orbital Elements for WSI139

WDS:	WSI139	WDS ID/Discoverer
P:	14.500	Orbital period (years)
a:	0.2572	Semi-major axis (arcseconds)
i:	93.8	Inclination (degrees)
Ω:	153.3	Longitude of ascending node (degrees)
T:	2015.480	Epoch of periastron passage (year)
e:	0.23	Eccentricity
ω:	162.4	Longitude of periastron (degrees)
Start-Year:	2017.75	Year
End-Year:	2032.25	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for WSI139
Position:	230335.60-465047.0	Epoch-2000 right ascension and declination
WDS-ID:	23036-4651	WDS designation
Discoverer Code:	WSI139	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	13.6	Magnitude of the primary
V2:	13.7	Magnitude of the secondary
Equinox:		Equinox
Date:	2019	Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Tok2020e	Reference

Double Star Orbit for WSI139

WDS 6th Orbit including measures of WSI139

-- 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 WSI139

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.172   148.76
--------------------------
2017.75    0.104   325.57
2017.85    0.095   324.50
2017.95    0.085   323.20
2018.05    0.076   321.55
2018.15    0.066   319.42
2018.25    0.056   316.53
2018.35    0.046   312.40
2018.45    0.037   306.08
2018.55    0.028   295.53
2018.65    0.021   276.52
2018.75    0.017   245.24
2018.85    0.020   213.38
2018.95    0.027   193.70
2019.05    0.036   182.80
2019.15    0.045   176.31
2019.25    0.055   172.09
2019.35    0.065   169.15
2019.45    0.075   166.99
2019.55    0.085   165.34
2019.65    0.095   164.03
2019.75    0.105   162.96
2019.85    0.114   162.08
2019.95    0.124   161.33
2020.05    0.133   160.69
2020.15    0.143   160.13
2020.25    0.152   159.64
2020.35    0.160   159.21
2020.45    0.169   158.82
2020.55    0.178   158.46
2020.65    0.186   158.14
2020.75    0.194   157.85
2020.85    0.202   157.58
2020.95    0.209   157.33
2021.05    0.217   157.10
2021.15    0.224   156.88
2021.25    0.231   156.67
2021.35    0.237   156.48
2021.45    0.244   156.30
2021.55    0.250   156.12
2021.65    0.256   155.96
2021.75    0.262   155.80
2021.85    0.267   155.65
2021.95    0.272   155.50
2022.05    0.277   155.36
2022.15    0.281   155.22
2022.25    0.285   155.09
2022.35    0.289   154.96
2022.45    0.293   154.84
2022.55    0.296   154.72
2022.65    0.299   154.60
2022.75    0.302   154.48
2022.85    0.305   154.37
2022.95    0.307   154.25
2023.05    0.309   154.14
2023.15    0.310   154.03
2023.25    0.311   153.92
2023.35    0.312   153.81
2023.45    0.313   153.70
2023.55    0.313   153.59
2023.65    0.313   153.49
2023.75    0.312   153.38
2023.85    0.312   153.27
2023.95    0.311   153.16
2024.05    0.309   153.05
2024.15    0.308   152.94
2024.25    0.306   152.83
2024.35    0.303   152.71
2024.45    0.300   152.60
2024.55    0.297   152.48
2024.65    0.294   152.36
2024.75    0.290   152.23
2024.85    0.286   152.10
2024.95    0.282   151.97
2025.05    0.277   151.84
2025.15    0.272   151.70
2025.25    0.267   151.55
2025.35    0.261   151.40
2025.45    0.255   151.24
2025.55    0.248   151.07
2025.65    0.242   150.90
2025.75    0.235   150.71
2025.85    0.227   150.51
2025.95    0.220   150.30
2026.05    0.212   150.07
2026.15    0.203   149.82
2026.25    0.195   149.56
2026.35    0.186   149.26
2026.45    0.176   148.94
2026.55    0.167   148.58
2026.65    0.157   148.18
2026.75    0.147   147.72
2026.85    0.137   147.19
2026.95    0.126   146.57
2027.05    0.115   145.85
2027.15    0.104   144.96
2027.25    0.093   143.87
2027.35    0.082   142.48
2027.45    0.070   140.64
2027.55    0.059   138.08
2027.65    0.047   134.28
2027.75    0.036   128.08
2027.85    0.026   116.56
2027.95    0.017    91.92
2028.05    0.016    48.57
2028.15    0.022    15.80
2028.25    0.032     0.52
2028.35    0.043   352.77
2028.45    0.054   348.22
2028.55    0.066   345.25
2028.65    0.077   343.16
2028.75    0.088   341.60
2028.85    0.099   340.39
2028.95    0.110   339.42
2029.05    0.120   338.61
2029.15    0.130   337.93
2029.25    0.139   337.35
2029.35    0.148   336.83
2029.45    0.156   336.37
2029.55    0.164   335.96
2029.65    0.171   335.58
2029.75    0.177   335.23
2029.85    0.183   334.90
2029.95    0.188   334.59
2030.05    0.192   334.30
2030.15    0.195   334.02
2030.25    0.197   333.74
2030.35    0.199   333.47
2030.45    0.200   333.21
2030.55    0.200   332.94
2030.65    0.199   332.68
2030.75    0.198   332.41
2030.85    0.196   332.14
2030.95    0.193   331.86
2031.05    0.189   331.57
2031.15    0.185   331.26
2031.25    0.180   330.95
2031.35    0.175   330.61
2031.45    0.169   330.25
2031.55    0.162   329.86
2031.65    0.155   329.44
2031.75    0.147   328.98
2031.85    0.140   328.46
2031.95    0.131   327.89
2032.05    0.123   327.23
2032.15    0.114   326.47

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 18:46:56