Double Star Calculator - Orbit

Orbital Elements for A2166
WDS: A2166 WDS ID/Discoverer
P: 11.228 Orbital period (years)
a: 0.098 Semi-major axis (arcseconds)
i: 67.8 Inclination (degrees)
Ω: 197.9 Longitude of ascending node (degrees)
T: 2007.128 Epoch of periastron passage (year)
e: 0.823 Eccentricity
ω: 314.9 Longitude of periastron (degrees)
Start-Year: 2019.386 Year
End-Year: 2030.614 Year
Epoch: 2026.5 Besselian Epoch
 
Further data from the WDS Sixth Catalog of Orbits for A2166
Position: 132015.78+174557.7 Epoch-2000 right ascension and declination
WDS-ID: 13203+1746 WDS designation
Discoverer Code: A2166 Discover designation and components
ADS number: 8863 Aitken Double Star catalog
HD number: 115955 HD catalog number
Hipparcos number: 65069 Hipparcos catalog number
V1: 7.78 Magnitude of the primary
V2: 8.38 Magnitude of the secondary
Equinox: 2000 Equinox
Date: 2020 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: Tok2020g Reference

Double Star Orbit for A2166



WDS 6th Orbit including measures of A2166

-- 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 A2166
Click to expand/collapse ephemeris: 
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.136     5.71
--------------------------
2019.39    0.032   297.70
2019.49    0.034   303.74
2019.59    0.037   308.89
2019.69    0.040   313.30
2019.79    0.043   317.10
2019.89    0.046   320.40
2019.99    0.049   323.28
2020.09    0.053   325.83
2020.19    0.056   328.09
2020.29    0.059   330.12
2020.39    0.062   331.94
2020.49    0.065   333.60
2020.59    0.068   335.11
2020.69    0.071   336.50
2020.79    0.073   337.77
2020.89    0.076   338.95
2020.99    0.079   340.05
2021.09    0.082   341.07
2021.19    0.084   342.03
2021.29    0.087   342.93
2021.39    0.089   343.78
2021.49    0.092   344.59
2021.59    0.094   345.35
2021.69    0.097   346.07
2021.79    0.099   346.76
2021.89    0.101   347.42
2021.99    0.104   348.05
2022.09    0.106   348.65
2022.19    0.108   349.23
2022.29    0.110   349.79
2022.39    0.112   350.33
2022.49    0.114   350.85
2022.59    0.115   351.35
2022.69    0.117   351.84
2022.79    0.119   352.31
2022.89    0.121   352.77
2022.99    0.122   353.22
2023.09    0.124   353.66
2023.19    0.125   354.08
2023.29    0.127   354.50
2023.39    0.128   354.91
2023.49    0.129   355.31
2023.59    0.131   355.70
2023.69    0.132   356.08
2023.79    0.133   356.46
2023.89    0.134   356.83
2023.99    0.135   357.19
2024.09    0.136   357.55
2024.19    0.137   357.91
2024.29    0.138   358.26
2024.39    0.138   358.61
2024.49    0.139   358.95
2024.59    0.140   359.29
2024.69    0.140   359.63
2024.79    0.141   359.96
2024.89    0.141     0.30
2024.99    0.141     0.63
2025.09    0.142     0.96
2025.19    0.142     1.29
2025.29    0.142     1.62
2025.39    0.142     1.95
2025.49    0.142     2.28
2025.59    0.142     2.61
2025.69    0.141     2.94
2025.79    0.141     3.27
2025.89    0.141     3.60
2025.99    0.140     3.94
2026.09    0.140     4.27
2026.19    0.139     4.62
2026.29    0.138     4.96
2026.39    0.137     5.31
2026.49    0.136     5.66
2026.59    0.135     6.02
2026.69    0.134     6.39
2026.79    0.133     6.76
2026.89    0.131     7.14
2026.99    0.130     7.52
2027.09    0.128     7.92
2027.19    0.126     8.33
2027.29    0.124     8.75
2027.39    0.122     9.19
2027.49    0.120     9.64
2027.59    0.118    10.11
2027.69    0.115    10.59
2027.79    0.112    11.11
2027.89    0.109    11.65
2027.99    0.106    12.22
2028.09    0.103    12.82
2028.19    0.099    13.47
2028.29    0.095    14.18
2028.39    0.091    14.94
2028.49    0.086    15.78
2028.59    0.081    16.72
2028.69    0.076    17.79
2028.79    0.070    19.03
2028.89    0.064    20.51
2028.99    0.057    22.33
2029.09    0.049    24.71
2029.19    0.040    28.09
2029.29    0.030    33.58
2029.39    0.019    45.40
2029.49    0.008    93.73
2029.59    0.013   177.89
2029.69    0.021   200.50
2029.79    0.024   213.60
2029.89    0.024   225.15
2029.99    0.024   236.58
2030.09    0.024   248.09
2030.19    0.024   259.42
2030.29    0.025   270.13
2030.39    0.027   279.87
2030.49    0.029   288.44
2030.59    0.031   295.83



 

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 16:55:12


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