Double Star Calculator - Orbit

Orbital Elements for A2909AB

WDS:	A2909AB	WDS ID/Discoverer
P:	11.350	Orbital period (years)
a:	0.172	Semi-major axis (arcseconds)
i:	71.3	Inclination (degrees)
Ω:	16.2	Longitude of ascending node (degrees)
T:	2013.740	Epoch of periastron passage (year)
e:	0.507	Eccentricity
ω:	283.0	Longitude of periastron (degrees)
Start-Year:	2019.325	Year
End-Year:	2030.675	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A2909AB
Position:	032424.73-153913.8	Epoch-2000 right ascension and declination
WDS-ID:	03244-1539	WDS designation
Discoverer Code:	A2909AB	Discover designation and components
ADS number:	2524	Aitken Double Star catalog
HD number:	21161	HD catalog number
Hipparcos number:	15868	Hipparcos catalog number
V1:	8.4	Magnitude of the primary
V2:	8.4	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2013	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:	Doc2016d	Reference

Double Star Orbit for A2909AB

WDS 6th Orbit including measures of A2909AB

-- 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 A2909AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.131    25.48
--------------------------
2019.33    0.097   139.55
2019.42    0.100   142.22
2019.52    0.103   144.74
2019.62    0.106   147.12
2019.72    0.109   149.37
2019.82    0.112   151.49
2019.92    0.115   153.51
2020.02    0.118   155.41
2020.12    0.121   157.22
2020.22    0.125   158.93
2020.32    0.128   160.56
2020.42    0.131   162.11
2020.52    0.134   163.59
2020.62    0.137   165.00
2020.72    0.140   166.35
2020.82    0.143   167.65
2020.92    0.146   168.89
2021.02    0.149   170.09
2021.12    0.151   171.24
2021.22    0.154   172.36
2021.32    0.156   173.43
2021.42    0.159   174.48
2021.52    0.161   175.50
2021.62    0.163   176.49
2021.72    0.165   177.45
2021.82    0.166   178.40
2021.92    0.168   179.33
2022.02    0.169   180.24
2022.12    0.170   181.14
2022.22    0.171   182.03
2022.32    0.172   182.91
2022.42    0.172   183.78
2022.52    0.172   184.66
2022.62    0.172   185.53
2022.72    0.172   186.41
2022.82    0.171   187.29
2022.92    0.170   188.19
2023.02    0.168   189.10
2023.12    0.166   190.03
2023.22    0.163   190.99
2023.32    0.161   191.97
2023.42    0.157   193.00
2023.52    0.153   194.08
2023.62    0.148   195.22
2023.72    0.143   196.44
2023.82    0.137   197.76
2023.92    0.131   199.20
2024.02    0.123   200.81
2024.12    0.115   202.65
2024.22    0.106   204.78
2024.32    0.096   207.35
2024.42    0.085   210.56
2024.52    0.073   214.76
2024.62    0.060   220.65
2024.72    0.048   229.59
2024.82    0.037   244.47
2024.92    0.029   269.93
2025.02    0.028   303.50
2025.12    0.036   329.72
2025.22    0.047   345.18
2025.32    0.059   354.48
2025.42    0.071     0.64
2025.52    0.082     5.08
2025.62    0.092     8.53
2025.72    0.100    11.34
2025.82    0.108    13.74
2025.92    0.114    15.86
2026.02    0.119    17.77
2026.12    0.123    19.55
2026.22    0.126    21.21
2026.32    0.129    22.80
2026.42    0.131    24.35
2026.52    0.132    25.85
2026.62    0.132    27.34
2026.72    0.132    28.82
2026.82    0.132    30.30
2026.92    0.131    31.79
2027.02    0.130    33.31
2027.12    0.129    34.85
2027.22    0.127    36.43
2027.32    0.125    38.05
2027.42    0.123    39.73
2027.52    0.121    41.46
2027.62    0.119    43.26
2027.72    0.116    45.14
2027.82    0.114    47.10
2027.92    0.111    49.15
2028.02    0.108    51.31
2028.12    0.106    53.57
2028.22    0.103    55.95
2028.32    0.100    58.45
2028.42    0.098    61.09
2028.52    0.095    63.87
2028.62    0.093    66.79
2028.72    0.091    69.87
2028.82    0.089    73.09
2028.92    0.087    76.46
2029.02    0.085    79.97
2029.12    0.084    83.61
2029.22    0.083    87.36
2029.32    0.082    91.21
2029.42    0.081    95.13
2029.52    0.081    99.10
2029.62    0.081   103.08
2029.72    0.081   107.04
2029.82    0.082   110.96
2029.92    0.083   114.81
2030.02    0.084   118.55
2030.12    0.085   122.18
2030.22    0.087   125.68
2030.32    0.089   129.03
2030.42    0.091   132.23
2030.52    0.093   135.28
2030.62    0.096   138.17

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 15:10:07