Double Star Calculator - Orbit

Orbital Elements for 20OPH

WDS:	20OPH	WDS ID/Discoverer
P:	35.500	Orbital period (years)
a:	0.46	Semi-major axis (arcseconds)
i:	74.0	Inclination (degrees)
Ω:	118.0	Longitude of ascending node (degrees)
T:	1981.200	Epoch of periastron passage (year)
e:	0.8	Eccentricity
ω:	34.0	Longitude of periastron (degrees)
Start-Year:	2007.25	Year
End-Year:	2042.75	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for 20OPH
Position:	164950.02-104658.7	Epoch-2000 right ascension and declination
WDS-ID:	16498-1047	WDS designation
Discoverer Code:	20OPH	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	151769	HD catalog number
Hipparcos number:	82369	Hipparcos catalog number
V1:	4.6	Magnitude of the primary
V2:	8. >	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	9	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Gon2010	Reference

Double Star Orbit for 20OPH

WDS 6th Orbit including measures of 20OPH

-- 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 20OPH

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.680   302.96
--------------------------
2007.25    0.462   317.06
2007.35    0.457   317.23
2007.45    0.453   317.40
2007.55    0.448   317.58
2007.65    0.444   317.76
2007.75    0.439   317.94
2007.85    0.435   318.12
2007.95    0.430   318.31
2008.05    0.426   318.51
2008.15    0.421   318.71
2008.25    0.416   318.91
2008.35    0.412   319.12
2008.45    0.407   319.33
2008.55    0.402   319.54
2008.65    0.397   319.77
2008.75    0.392   319.99
2008.85    0.387   320.23
2008.95    0.382   320.47
2009.05    0.377   320.71
2009.15    0.372   320.97
2009.25    0.367   321.23
2009.35    0.362   321.49
2009.45    0.357   321.77
2009.55    0.352   322.05
2009.65    0.347   322.34
2009.75    0.341   322.64
2009.85    0.336   322.95
2009.95    0.331   323.27
2010.05    0.325   323.60
2010.15    0.320   323.94
2010.25    0.314   324.29
2010.35    0.309   324.66
2010.45    0.303   325.04
2010.55    0.298   325.43
2010.65    0.292   325.84
2010.75    0.287   326.26
2010.85    0.281   326.70
2010.95    0.275   327.16
2011.05    0.269   327.64
2011.15    0.264   328.14
2011.25    0.258   328.66
2011.35    0.252   329.21
2011.45    0.246   329.78
2011.55    0.240   330.38
2011.65    0.234   331.01
2011.75    0.228   331.67
2011.85    0.222   332.37
2011.95    0.216   333.11
2012.05    0.210   333.89
2012.15    0.204   334.71
2012.25    0.198   335.59
2012.35    0.192   336.52
2012.45    0.186   337.51
2012.55    0.180   338.57
2012.65    0.174   339.70
2012.75    0.168   340.92
2012.85    0.162   342.22
2012.95    0.156   343.63
2013.05    0.150   345.14
2013.15    0.144   346.79
2013.25    0.138   348.57
2013.35    0.132   350.51
2013.45    0.127   352.63
2013.55    0.121   354.94
2013.65    0.116   357.47
2013.75    0.110     0.25
2013.85    0.105     3.30
2013.95    0.101     6.64
2014.05    0.096    10.31
2014.15    0.092    14.32
2014.25    0.088    18.69
2014.35    0.085    23.42
2014.45    0.082    28.49
2014.55    0.080    33.86
2014.65    0.079    39.49
2014.75    0.078    45.27
2014.85    0.078    51.13
2014.95    0.078    56.95
2015.05    0.080    62.65
2015.15    0.081    68.13
2015.25    0.084    73.34
2015.35    0.086    78.25
2015.45    0.089    82.84
2015.55    0.093    87.12
2015.65    0.096    91.11
2015.75    0.099    94.84
2015.85    0.102    98.33
2015.95    0.105   101.64
2016.05    0.107   104.82
2016.15    0.107   107.91
2016.25    0.107   110.99
2016.35    0.105   114.14
2016.45    0.100   117.50
2016.55    0.093   121.27
2016.65    0.083   125.80
2016.75    0.071   131.74
2016.85    0.057   140.46
2016.95    0.043   154.88
2017.05    0.033   180.28
2017.15    0.032   215.41
2017.25    0.042   242.81
2017.35    0.056   258.28
2017.45    0.072   267.18
2017.55    0.088   272.80
2017.65    0.104   276.66
2017.75    0.120   279.49
2017.85    0.136   281.67
2017.95    0.151   283.40
2018.05    0.165   284.83
2018.15    0.180   286.02
2018.25    0.193   287.04
2018.35    0.207   287.93
2018.45    0.219   288.72
2018.55    0.232   289.41
2018.65    0.244   290.04
2018.75    0.256   290.61
2018.85    0.267   291.13
2018.95    0.279   291.60
2019.05    0.289   292.04
2019.15    0.300   292.45
2019.25    0.310   292.83
2019.35    0.320   293.19
2019.45    0.330   293.53
2019.55    0.340   293.84
2019.65    0.349   294.14
2019.75    0.358   294.43
2019.85    0.367   294.70
2019.95    0.376   294.95
2020.05    0.384   295.20
2020.15    0.392   295.44
2020.25    0.400   295.66
2020.35    0.408   295.88
2020.45    0.416   296.09
2020.55    0.424   296.29
2020.65    0.431   296.48
2020.75    0.438   296.67
2020.85    0.445   296.85
2020.95    0.452   297.03
2021.05    0.459   297.20
2021.15    0.466   297.37
2021.25    0.472   297.53
2021.35    0.479   297.68
2021.45    0.485   297.84
2021.55    0.491   297.99
2021.65    0.497   298.13
2021.75    0.503   298.27
2021.85    0.509   298.41
2021.95    0.515   298.55
2022.05    0.520   298.68
2022.15    0.526   298.81
2022.25    0.531   298.94
2022.35    0.536   299.06
2022.45    0.541   299.18
2022.55    0.546   299.30
2022.65    0.551   299.42
2022.75    0.556   299.54
2022.85    0.561   299.65
2022.95    0.565   299.76
2023.05    0.570   299.87
2023.15    0.574   299.98
2023.25    0.579   300.09
2023.35    0.583   300.19
2023.45    0.587   300.30
2023.55    0.591   300.40
2023.65    0.595   300.50
2023.75    0.599   300.60
2023.85    0.603   300.70
2023.95    0.607   300.79
2024.05    0.611   300.89
2024.15    0.614   300.98
2024.25    0.618   301.08
2024.35    0.622   301.17
2024.45    0.625   301.26
2024.55    0.628   301.35
2024.65    0.632   301.44
2024.75    0.635   301.53
2024.85    0.638   301.62
2024.95    0.641   301.70
2025.05    0.644   301.79
2025.15    0.647   301.88
2025.25    0.650   301.96
2025.35    0.653   302.04
2025.45    0.655   302.13
2025.55    0.658   302.21
2025.65    0.661   302.29
2025.75    0.663   302.37
2025.85    0.666   302.45
2025.95    0.668   302.53
2026.05    0.670   302.61
2026.15    0.673   302.69
2026.25    0.675   302.77
2026.35    0.677   302.85
2026.45    0.679   302.92
2026.55    0.681   303.00
2026.65    0.683   303.08
2026.75    0.685   303.15
2026.85    0.687   303.23
2026.95    0.689   303.30
2027.05    0.691   303.38
2027.15    0.693   303.45
2027.25    0.694   303.52
2027.35    0.696   303.60
2027.45    0.698   303.67
2027.55    0.699   303.74
2027.65    0.701   303.82
2027.75    0.702   303.89
2027.85    0.704   303.96
2027.95    0.705   304.03
2028.05    0.706   304.10
2028.15    0.707   304.17
2028.25    0.709   304.24
2028.35    0.710   304.32
2028.45    0.711   304.39
2028.55    0.712   304.46
2028.65    0.713   304.53
2028.75    0.714   304.60
2028.85    0.715   304.66
2028.95    0.716   304.73
2029.05    0.716   304.80
2029.15    0.717   304.87
2029.25    0.718   304.94
2029.35    0.719   305.01
2029.45    0.719   305.08
2029.55    0.720   305.15
2029.65    0.720   305.22
2029.75    0.721   305.28
2029.85    0.721   305.35
2029.95    0.722   305.42
2030.05    0.722   305.49
2030.15    0.722   305.56
2030.25    0.723   305.62
2030.35    0.723   305.69
2030.45    0.723   305.76
2030.55    0.723   305.83
2030.65    0.723   305.90
2030.75    0.723   305.96
2030.85    0.723   306.03
2030.95    0.723   306.10
2031.05    0.723   306.17
2031.15    0.723   306.24
2031.25    0.723   306.30
2031.35    0.723   306.37
2031.45    0.723   306.44
2031.55    0.722   306.51
2031.65    0.722   306.58
2031.75    0.722   306.64
2031.85    0.721   306.71
2031.95    0.721   306.78
2032.05    0.721   306.85
2032.15    0.720   306.92
2032.25    0.720   306.98
2032.35    0.719   307.05
2032.45    0.718   307.12
2032.55    0.718   307.19
2032.65    0.717   307.26
2032.75    0.716   307.33
2032.85    0.716   307.40
2032.95    0.715   307.47
2033.05    0.714   307.54
2033.15    0.713   307.61
2033.25    0.712   307.68
2033.35    0.711   307.75
2033.45    0.710   307.82
2033.55    0.709   307.89
2033.65    0.708   307.96
2033.75    0.707   308.03
2033.85    0.706   308.10
2033.95    0.705   308.17
2034.05    0.703   308.24
2034.15    0.702   308.32
2034.25    0.701   308.39
2034.35    0.700   308.46
2034.45    0.698   308.53
2034.55    0.697   308.61
2034.65    0.695   308.68
2034.75    0.694   308.75
2034.85    0.692   308.83
2034.95    0.691   308.90
2035.05    0.689   308.97
2035.15    0.688   309.05
2035.25    0.686   309.12
2035.35    0.684   309.20
2035.45    0.683   309.28
2035.55    0.681   309.35
2035.65    0.679   309.43
2035.75    0.677   309.51
2035.85    0.675   309.58
2035.95    0.673   309.66
2036.05    0.672   309.74
2036.15    0.670   309.82
2036.25    0.668   309.90
2036.35    0.666   309.98
2036.45    0.663   310.06
2036.55    0.661   310.14
2036.65    0.659   310.22
2036.75    0.657   310.30
2036.85    0.655   310.39
2036.95    0.653   310.47
2037.05    0.650   310.55
2037.15    0.648   310.64
2037.25    0.646   310.72
2037.35    0.643   310.81
2037.45    0.641   310.89
2037.55    0.638   310.98
2037.65    0.636   311.07
2037.75    0.633   311.16
2037.85    0.631   311.24
2037.95    0.628   311.33
2038.05    0.625   311.42
2038.15    0.623   311.52
2038.25    0.620   311.61
2038.35    0.617   311.70
2038.45    0.615   311.79
2038.55    0.612   311.89
2038.65    0.609   311.98
2038.75    0.606   312.08
2038.85    0.603   312.18
2038.95    0.600   312.27
2039.05    0.597   312.37
2039.15    0.594   312.47
2039.25    0.591   312.57
2039.35    0.588   312.68
2039.45    0.585   312.78
2039.55    0.582   312.88
2039.65    0.578   312.99
2039.75    0.575   313.10
2039.85    0.572   313.20
2039.95    0.569   313.31
2040.05    0.565   313.42
2040.15    0.562   313.54
2040.25    0.559   313.65
2040.35    0.555   313.76
2040.45    0.552   313.88
2040.55    0.548   314.00
2040.65    0.545   314.11
2040.75    0.541   314.24
2040.85    0.537   314.36
2040.95    0.534   314.48
2041.05    0.530   314.61
2041.15    0.526   314.73
2041.25    0.522   314.86
2041.35    0.519   314.99
2041.45    0.515   315.13
2041.55    0.511   315.26
2041.65    0.507   315.40
2041.75    0.503   315.54
2041.85    0.499   315.68
2041.95    0.495   315.82
2042.05    0.491   315.97
2042.15    0.487   316.12
2042.25    0.483   316.27
2042.35    0.479   316.42
2042.45    0.474   316.58
2042.55    0.470   316.74
2042.65    0.466   316.90

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 17:31:13