Double Star Calculator - Orbit

Orbital Elements for WSI77

WDS:	WSI77	WDS ID/Discoverer
P:	10.490	Orbital period (years)
a:	0.2848	Semi-major axis (arcseconds)
i:	96.4	Inclination (degrees)
Ω:	171.6	Longitude of ascending node (degrees)
T:	2009.258	Epoch of periastron passage (year)
e:	0.342	Eccentricity
ω:	140.2	Longitude of periastron (degrees)
Start-Year:	2019.755	Year
End-Year:	2030.245	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for WSI77
Position:	135120.32-242325.3	Epoch-2000 right ascension and declination
WDS-ID:	13513-2423	WDS designation
Discoverer Code:	WSI77	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	120690	HD catalog number
Hipparcos number:	67620	Hipparcos catalog number
V1:	6.45	Magnitude of the primary
V2:	9.9	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	2	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Tok2024c	Reference

Double Star Orbit for WSI77

WDS 6th Orbit including measures of WSI77

-- 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 WSI77

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.353   172.92
--------------------------
2019.76    0.146   356.81
2019.86    0.160   355.56
2019.95    0.172   354.50
2020.05    0.183   353.58
2020.15    0.191   352.75
2020.25    0.197   351.97
2020.35    0.201   351.24
2020.45    0.203   350.52
2020.55    0.203   349.81
2020.65    0.201   349.10
2020.75    0.198   348.37
2020.85    0.193   347.61
2020.95    0.187   346.80
2021.05    0.180   345.93
2021.15    0.171   344.99
2021.25    0.162   343.94
2021.35    0.152   342.75
2021.45    0.141   341.40
2021.55    0.130   339.81
2021.65    0.118   337.92
2021.75    0.106   335.61
2021.85    0.094   332.70
2021.95    0.082   328.93
2022.05    0.070   323.86
2022.15    0.059   316.75
2022.25    0.048   306.45
2022.35    0.040   291.37
2022.45    0.036   270.97
2022.55    0.037   248.70
2022.65    0.043   230.09
2022.75    0.052   216.93
2022.85    0.063   207.97
2022.95    0.075   201.73
2023.05    0.087   197.22
2023.15    0.099   193.84
2023.25    0.112   191.21
2023.35    0.124   189.12
2023.45    0.137   187.41
2023.55    0.149   185.98
2023.65    0.161   184.76
2023.75    0.173   183.72
2023.85    0.185   182.81
2023.95    0.196   182.00
2024.05    0.207   181.29
2024.15    0.218   180.64
2024.25    0.229   180.06
2024.35    0.239   179.52
2024.45    0.249   179.03
2024.55    0.258   178.58
2024.65    0.267   178.15
2024.75    0.276   177.76
2024.85    0.284   177.39
2024.95    0.292   177.03
2025.05    0.299   176.70
2025.15    0.307   176.38
2025.25    0.313   176.08
2025.35    0.319   175.79
2025.45    0.325   175.51
2025.55    0.330   175.24
2025.65    0.335   174.97
2025.75    0.339   174.71
2025.85    0.343   174.46
2025.95    0.346   174.22
2026.05    0.348   173.98
2026.15    0.350   173.74
2026.25    0.352   173.50
2026.35    0.353   173.26
2026.45    0.353   173.03
2026.55    0.352   172.80
2026.65    0.352   172.56
2026.75    0.350   172.32
2026.85    0.348   172.08
2026.95    0.345   171.84
2027.05    0.341   171.59
2027.15    0.337   171.34
2027.25    0.332   171.08
2027.35    0.326   170.81
2027.45    0.319   170.53
2027.55    0.312   170.23
2027.65    0.304   169.93
2027.75    0.295   169.60
2027.85    0.285   169.25
2027.95    0.274   168.88
2028.05    0.263   168.48
2028.15    0.251   168.04
2028.25    0.238   167.55
2028.35    0.224   167.00
2028.45    0.209   166.37
2028.55    0.193   165.65
2028.65    0.176   164.79
2028.75    0.159   163.75
2028.85    0.141   162.45
2028.95    0.122   160.75
2029.05    0.102   158.40
2029.15    0.082   154.94
2029.25    0.062   149.25
2029.35    0.043   138.29
2029.45    0.027   112.43
2029.55    0.024    61.77
2029.65    0.037    27.70
2029.75    0.056    13.71
2029.85    0.076     6.84
2029.95    0.095     2.81
2030.05    0.114     0.13
2030.15    0.131   358.18

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 16:59:33