Double Star Calculator - Orbit

Orbital Elements for REU1

WDS:	REU1	WDS ID/Discoverer
P:	15.811	Orbital period (years)
a:	0.91	Semi-major axis (arcseconds)
i:	102.8	Inclination (degrees)
Ω:	143.2	Longitude of ascending node (degrees)
T:	2008.120	Epoch of periastron passage (year)
e:	0.301	Eccentricity
ω:	347.7	Longitude of periastron (degrees)
Start-Year:	2017.0945	Year
End-Year:	2032.9055	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for REU1
Position:	123317.36+090115.8	Epoch-2000 right ascension and declination
WDS-ID:	12335+0901	WDS designation
Discoverer Code:	REU1	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	12.6	Magnitude of the primary
V2:	12.6	Magnitude of the secondary
Equinox:		Equinox
Date:	2022	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:	Lin2022b	Reference

Double Star Orbit for REU1

WDS 6th Orbit including measures of REU1

-- 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 REU1

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.230    90.29
--------------------------
2017.09    1.169   322.86
2017.19    1.165   322.57
2017.29    1.160   322.27
2017.39    1.155   321.98
2017.49    1.149   321.68
2017.59    1.141   321.37
2017.69    1.133   321.07
2017.79    1.124   320.75
2017.89    1.115   320.43
2017.99    1.104   320.11
2018.09    1.092   319.78
2018.19    1.080   319.44
2018.29    1.067   319.10
2018.39    1.053   318.74
2018.49    1.038   318.38
2018.59    1.022   318.00
2018.69    1.005   317.61
2018.79    0.987   317.21
2018.89    0.969   316.80
2018.99    0.950   316.36
2019.09    0.930   315.91
2019.19    0.909   315.44
2019.29    0.887   314.95
2019.39    0.864   314.43
2019.49    0.840   313.88
2019.59    0.816   313.30
2019.69    0.791   312.68
2019.79    0.765   312.02
2019.89    0.738   311.32
2019.99    0.710   310.56
2020.09    0.682   309.73
2020.19    0.653   308.84
2020.29    0.623   307.86
2020.39    0.593   306.78
2020.49    0.562   305.59
2020.59    0.530   304.25
2020.69    0.498   302.74
2020.79    0.466   301.03
2020.89    0.433   299.06
2020.99    0.401   296.76
2021.09    0.368   294.06
2021.19    0.336   290.83
2021.29    0.304   286.92
2021.39    0.273   282.12
2021.49    0.244   276.15
2021.59    0.219   268.68
2021.69    0.197   259.38
2021.79    0.181   248.13
2021.89    0.173   235.28
2021.99    0.173   221.87
2022.09    0.183   209.21
2022.19    0.199   198.22
2022.29    0.222   189.18
2022.39    0.248   181.92
2022.49    0.276   176.09
2022.59    0.306   171.38
2022.69    0.337   167.52
2022.79    0.367   164.30
2022.89    0.398   161.57
2022.99    0.427   159.23
2023.09    0.456   157.19
2023.19    0.483   155.38
2023.29    0.509   153.76
2023.39    0.533   152.29
2023.49    0.554   150.94
2023.59    0.574   149.69
2023.69    0.591   148.52
2023.79    0.606   147.41
2023.89    0.618   146.34
2023.99    0.628   145.32
2024.09    0.635   144.32
2024.19    0.639   143.34
2024.29    0.641   142.37
2024.39    0.639   141.39
2024.49    0.635   140.41
2024.59    0.629   139.42
2024.69    0.620   138.40
2024.79    0.609   137.34
2024.89    0.595   136.25
2024.99    0.580   135.09
2025.09    0.562   133.87
2025.19    0.543   132.57
2025.29    0.522   131.16
2025.39    0.500   129.64
2025.49    0.477   127.97
2025.59    0.452   126.12
2025.69    0.427   124.05
2025.79    0.401   121.73
2025.89    0.375   119.07
2025.99    0.348   116.02
2026.09    0.323   112.48
2026.19    0.297   108.32
2026.29    0.273   103.41
2026.39    0.251    97.59
2026.49    0.231    90.70
2026.59    0.215    82.65
2026.69    0.203    73.47
2026.79    0.196    63.43
2026.89    0.196    53.02
2026.99    0.202    42.88
2027.09    0.213    33.55
2027.19    0.228    25.31
2027.29    0.248    18.26
2027.39    0.270    12.30
2027.49    0.295     7.29
2027.59    0.320     3.07
2027.69    0.347   359.49
2027.79    0.375   356.43
2027.89    0.403   353.80
2027.99    0.431   351.51
2028.09    0.460   349.50
2028.19    0.488   347.72
2028.29    0.516   346.14
2028.39    0.544   344.73
2028.49    0.572   343.45
2028.59    0.600   342.29
2028.69    0.627   341.23
2028.79    0.653   340.26
2028.89    0.679   339.36
2028.99    0.705   338.53
2029.09    0.730   337.75
2029.19    0.755   337.03
2029.29    0.779   336.35
2029.39    0.802   335.71
2029.49    0.825   335.11
2029.59    0.847   334.54
2029.69    0.868   334.00
2029.79    0.889   333.48
2029.89    0.909   332.99
2029.99    0.929   332.52
2030.09    0.948   332.07
2030.19    0.966   331.63
2030.29    0.983   331.21
2030.39    1.000   330.81
2030.49    1.016   330.41
2030.59    1.031   330.03
2030.69    1.046   329.67
2030.79    1.060   329.31
2030.89    1.073   328.96
2030.99    1.085   328.61
2031.09    1.097   328.28
2031.19    1.107   327.95
2031.29    1.117   327.63
2031.39    1.127   327.31
2031.49    1.135   327.00
2031.59    1.143   326.69
2031.69    1.150   326.39
2031.79    1.156   326.09
2031.89    1.161   325.79
2031.99    1.166   325.50
2032.09    1.169   325.21
2032.19    1.172   324.92
2032.29    1.174   324.63
2032.39    1.175   324.34
2032.49    1.176   324.05
2032.59    1.175   323.76
2032.69    1.174   323.47
2032.79    1.172   323.18
2032.89    1.169   322.89

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 16:47:36