Double Star Calculator - Orbit

Orbital Elements for WSI7

WDS:	WSI7	WDS ID/Discoverer
P:	17.800	Orbital period (years)
a:	0.167	Semi-major axis (arcseconds)
i:	122.1	Inclination (degrees)
Ω:	247.3	Longitude of ascending node (degrees)
T:	2014.600	Epoch of periastron passage (year)
e:	0.31	Eccentricity
ω:	285.6	Longitude of periastron (degrees)
Start-Year:	2016.1	Year
End-Year:	2033.9	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for WSI7
Position:	212416.13+373944.2	Epoch-2000 right ascension and declination
WDS-ID:	21243+3740	WDS designation
Discoverer Code:	WSI7	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	203940	HD catalog number
Hipparcos number:	105676	Hipparcos catalog number
V1:	7.81	Magnitude of the primary
V2:	.	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2012	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:	RAO2015	Reference

Double Star Orbit for WSI7

WDS 6th Orbit including measures of WSI7

-- 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 WSI7

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.171    90.53
--------------------------
2016.10    0.124   257.26
2016.20    0.127   255.46
2016.30    0.130   253.73
2016.40    0.133   252.08
2016.50    0.135   250.49
2016.60    0.137   248.95
2016.70    0.139   247.46
2016.80    0.141   246.00
2016.90    0.142   244.58
2017.00    0.144   243.19
2017.10    0.145   241.83
2017.20    0.146   240.48
2017.30    0.147   239.15
2017.40    0.147   237.84
2017.50    0.148   236.53
2017.60    0.148   235.23
2017.70    0.148   233.94
2017.80    0.148   232.64
2017.90    0.148   231.35
2018.00    0.148   230.05
2018.10    0.148   228.75
2018.20    0.147   227.44
2018.30    0.147   226.13
2018.40    0.146   224.80
2018.50    0.145   223.45
2018.60    0.144   222.10
2018.70    0.144   220.72
2018.80    0.143   219.33
2018.90    0.142   217.92
2019.00    0.140   216.48
2019.10    0.139   215.03
2019.20    0.138   213.55
2019.30    0.137   212.04
2019.40    0.136   210.51
2019.50    0.134   208.94
2019.60    0.133   207.35
2019.70    0.132   205.72
2019.80    0.131   204.07
2019.90    0.129   202.38
2020.00    0.128   200.66
2020.10    0.127   198.90
2020.20    0.126   197.11
2020.30    0.124   195.28
2020.40    0.123   193.42
2020.50    0.122   191.52
2020.60    0.121   189.59
2020.70    0.120   187.63
2020.80    0.119   185.63
2020.90    0.118   183.61
2021.00    0.117   181.55
2021.10    0.117   179.47
2021.20    0.116   177.36
2021.30    0.115   175.24
2021.40    0.115   173.09
2021.50    0.115   170.92
2021.60    0.114   168.75
2021.70    0.114   166.56
2021.80    0.114   164.37
2021.90    0.114   162.18
2022.00    0.114   159.98
2022.10    0.114   157.80
2022.20    0.115   155.62
2022.30    0.115   153.46
2022.40    0.115   151.32
2022.50    0.116   149.19
2022.60    0.117   147.09
2022.70    0.118   145.01
2022.80    0.118   142.96
2022.90    0.119   140.95
2023.00    0.120   138.96
2023.10    0.121   137.01
2023.20    0.123   135.10
2023.30    0.124   133.22
2023.40    0.125   131.38
2023.50    0.126   129.58
2023.60    0.128   127.82
2023.70    0.129   126.10
2023.80    0.131   124.41
2023.90    0.132   122.77
2024.00    0.134   121.16
2024.10    0.136   119.59
2024.20    0.137   118.05
2024.30    0.139   116.56
2024.40    0.140   115.09
2024.50    0.142   113.67
2024.60    0.144   112.27
2024.70    0.145   110.91
2024.80    0.147   109.57
2024.90    0.149   108.27
2025.00    0.150   106.99
2025.10    0.152   105.75
2025.20    0.154   104.53
2025.30    0.155   103.33
2025.40    0.157   102.16
2025.50    0.158   101.01
2025.60    0.160    99.88
2025.70    0.161    98.77
2025.80    0.163    97.69
2025.90    0.164    96.62
2026.00    0.165    95.57
2026.10    0.167    94.53
2026.20    0.168    93.51
2026.30    0.169    92.50
2026.40    0.170    91.51
2026.50    0.171    90.53
2026.60    0.172    89.56
2026.70    0.173    88.60
2026.80    0.174    87.65
2026.90    0.174    86.71
2027.00    0.175    85.77
2027.10    0.175    84.84
2027.20    0.176    83.92
2027.30    0.176    83.00
2027.40    0.176    82.08
2027.50    0.177    81.17
2027.60    0.177    80.25
2027.70    0.177    79.34
2027.80    0.176    78.43
2027.90    0.176    77.51
2028.00    0.176    76.59
2028.10    0.175    75.66
2028.20    0.174    74.73
2028.30    0.174    73.78
2028.40    0.173    72.83
2028.50    0.172    71.87
2028.60    0.170    70.89
2028.70    0.169    69.90
2028.80    0.167    68.90
2028.90    0.166    67.87
2029.00    0.164    66.82
2029.10    0.162    65.74
2029.20    0.160    64.64
2029.30    0.157    63.51
2029.40    0.155    62.34
2029.50    0.152    61.13
2029.60    0.149    59.87
2029.70    0.146    58.57
2029.80    0.143    57.21
2029.90    0.140    55.78
2030.00    0.136    54.29
2030.10    0.133    52.71
2030.20    0.129    51.04
2030.30    0.125    49.27
2030.40    0.121    47.38
2030.50    0.116    45.35
2030.60    0.112    43.16
2030.70    0.108    40.80
2030.80    0.103    38.23
2030.90    0.098    35.42
2031.00    0.094    32.33
2031.10    0.089    28.93
2031.20    0.085    25.17
2031.30    0.081    21.00
2031.40    0.076    16.37
2031.50    0.073    11.23
2031.60    0.069     5.56
2031.70    0.066   359.36
2031.80    0.064   352.65
2031.90    0.063   345.54
2032.00    0.062   338.16
2032.10    0.062   330.69
2032.20    0.063   323.32
2032.30    0.064   316.24
2032.40    0.067   309.58
2032.50    0.070   303.42
2032.60    0.073   297.79
2032.70    0.077   292.68
2032.80    0.081   288.06
2032.90    0.085   283.88
2033.00    0.089   280.11
2033.10    0.093   276.68
2033.20    0.098   273.55
2033.30    0.102   270.68
2033.40    0.106   268.04
2033.50    0.110   265.59
2033.60    0.114   263.31
2033.70    0.117   261.17
2033.80    0.121   259.16
2033.90    0.124   257.26

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 18:26:01