Double Star Calculator - Orbit

Orbital Elements for A1813AB

WDS:	A1813AB	WDS ID/Discoverer
P:	12.903	Orbital period (years)
a:	0.1496	Semi-major axis (arcseconds)
i:	66.1	Inclination (degrees)
Ω:	191.6	Longitude of ascending node (degrees)
T:	1989.090	Epoch of periastron passage (year)
e:	0.415	Eccentricity
ω:	113.7	Longitude of periastron (degrees)
Start-Year:	2018.5485	Year
End-Year:	2031.4515	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A1813AB
Position:	020212.83+364301.6	Epoch-2000 right ascension and declination
WDS-ID:	02022+3643	WDS designation
Discoverer Code:	A1813AB	Discover designation and components
ADS number:	1613	Aitken Double Star catalog
HD number:	12376	HD catalog number
Hipparcos number:	9500	Hipparcos catalog number
V1:	8.7	Magnitude of the primary
V2:	8.9	Magnitude of the secondary
Equinox:		Equinox
Date:	2014	Date of last observation
Orbit grade:	1	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Tok2020i	Reference

Double Star Orbit for A1813AB

WDS 6th Orbit including measures of A1813AB

-- 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 A1813AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.098   207.21
--------------------------
2018.55    0.086    67.23
2018.65    0.085    70.36
2018.75    0.084    73.60
2018.85    0.083    76.93
2018.95    0.082    80.34
2019.05    0.081    83.82
2019.15    0.081    87.34
2019.25    0.080    90.90
2019.35    0.080    94.47
2019.45    0.080    98.04
2019.55    0.081   101.57
2019.65    0.082   105.06
2019.75    0.082   108.49
2019.85    0.084   111.83
2019.95    0.085   115.08
2020.05    0.086   118.23
2020.15    0.088   121.27
2020.25    0.090   124.19
2020.35    0.092   126.99
2020.45    0.094   129.68
2020.55    0.096   132.24
2020.65    0.098   134.69
2020.75    0.100   137.02
2020.85    0.103   139.25
2020.95    0.105   141.37
2021.05    0.108   143.39
2021.15    0.111   145.32
2021.25    0.113   147.16
2021.35    0.116   148.91
2021.45    0.118   150.59
2021.55    0.121   152.19
2021.65    0.124   153.73
2021.75    0.126   155.20
2021.85    0.129   156.62
2021.95    0.131   157.98
2022.05    0.134   159.28
2022.15    0.136   160.54
2022.25    0.139   161.76
2022.35    0.141   162.93
2022.45    0.143   164.07
2022.55    0.146   165.17
2022.65    0.148   166.24
2022.75    0.150   167.28
2022.85    0.152   168.30
2022.95    0.154   169.28
2023.05    0.155   170.25
2023.15    0.157   171.19
2023.25    0.158   172.12
2023.35    0.160   173.03
2023.45    0.161   173.92
2023.55    0.162   174.80
2023.65    0.163   175.67
2023.75    0.164   176.53
2023.85    0.165   177.38
2023.95    0.165   178.22
2024.05    0.166   179.06
2024.15    0.166   179.90
2024.25    0.166   180.73
2024.35    0.166   181.57
2024.45    0.165   182.41
2024.55    0.165   183.25
2024.65    0.164   184.10
2024.75    0.163   184.96
2024.85    0.162   185.84
2024.95    0.160   186.72
2025.05    0.159   187.63
2025.15    0.157   188.55
2025.25    0.154   189.51
2025.35    0.152   190.49
2025.45    0.149   191.51
2025.55    0.146   192.57
2025.65    0.142   193.68
2025.75    0.138   194.84
2025.85    0.134   196.08
2025.95    0.130   197.40
2026.05    0.125   198.82
2026.15    0.120   200.37
2026.25    0.114   202.05
2026.35    0.108   203.92
2026.45    0.102   206.02
2026.55    0.095   208.41
2026.65    0.088   211.17
2026.75    0.080   214.43
2026.85    0.073   218.35
2026.95    0.065   223.19
2027.05    0.058   229.31
2027.15    0.051   237.21
2027.25    0.044   247.57
2027.35    0.039   260.96
2027.45    0.037   277.17
2027.55    0.037   294.51
2027.65    0.040   310.44
2027.75    0.045   323.47
2027.85    0.051   333.55
2027.95    0.058   341.31
2028.05    0.065   347.39
2028.15    0.072   352.28
2028.25    0.079   356.32
2028.35    0.085   359.76
2028.45    0.091     2.75
2028.55    0.096     5.40
2028.65    0.100     7.81
2028.75    0.104    10.03
2028.85    0.107    12.11
2028.95    0.110    14.07
2029.05    0.112    15.95
2029.15    0.113    17.78
2029.25    0.114    19.55
2029.35    0.115    21.30
2029.45    0.115    23.03
2029.55    0.115    24.76
2029.65    0.115    26.49
2029.75    0.114    28.24
2029.85    0.114    30.01
2029.95    0.113    31.81
2030.05    0.111    33.65
2030.15    0.110    35.53
2030.25    0.108    37.47
2030.35    0.107    39.46
2030.45    0.105    41.53
2030.55    0.103    43.66
2030.65    0.101    45.88
2030.75    0.099    48.18
2030.85    0.097    50.58
2030.95    0.095    53.07
2031.05    0.093    55.67
2031.15    0.091    58.37
2031.25    0.090    61.18
2031.35    0.088    64.10
2031.45    0.086    67.13

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 14:56:20