Double Star Calculator - Orbit

Orbital Elements for BU989AB

WDS:	BU989AB	WDS ID/Discoverer
P:	11.567	Orbital period (years)
a:	0.23494	Semi-major axis (arcseconds)
i:	107.911	Inclination (degrees)
Ω:	289.037	Longitude of ascending node (degrees)
T:	2002.348	Epoch of periastron passage (year)
e:	0.314	Eccentricity
ω:	304.666	Longitude of periastron (degrees)
Start-Year:	2019.2164952268656	Year
End-Year:	2030.7835047731344	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU989AB
Position:	214438.70+253842.0	Epoch-2000 right ascension and declination
WDS-ID:	21446+2539	WDS designation
Discoverer Code:	BU989AB	Discover designation and components
ADS number:	15281	Aitken Double Star catalog
HD number:	206901	HD catalog number
Hipparcos number:	107354	Hipparcos catalog number
V1:	4.94	Magnitude of the primary
V2:	5.04	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2007	Date of last observation
Orbit grade:	1	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Mut2008	Reference

Double Star Orbit for BU989AB

WDS 6th Orbit including measures of BU989AB

Error: Timeout while trying to load WDS 6th Orbit image.

Ephemeris of BU989AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.182   287.99
--------------------------
2019.22    0.161   140.82
2019.32    0.167   138.96
2019.42    0.174   137.23
2019.52    0.181   135.64
2019.62    0.187   134.15
2019.72    0.193   132.77
2019.82    0.199   131.46
2019.92    0.205   130.24
2020.02    0.211   129.09
2020.12    0.217   127.99
2020.22    0.222   126.95
2020.32    0.228   125.96
2020.42    0.233   125.01
2020.52    0.237   124.11
2020.62    0.242   123.23
2020.72    0.246   122.39
2020.82    0.250   121.57
2020.92    0.253   120.78
2021.02    0.257   120.01
2021.12    0.260   119.25
2021.22    0.262   118.52
2021.32    0.264   117.79
2021.42    0.266   117.08
2021.52    0.268   116.38
2021.62    0.269   115.68
2021.72    0.270   114.99
2021.82    0.270   114.30
2021.92    0.270   113.61
2022.02    0.269   112.92
2022.12    0.268   112.23
2022.22    0.267   111.53
2022.32    0.265   110.82
2022.42    0.262   110.09
2022.52    0.259   109.36
2022.62    0.256   108.60
2022.72    0.252   107.82
2022.82    0.247   107.01
2022.92    0.242   106.17
2023.02    0.236   105.30
2023.12    0.230   104.37
2023.22    0.223   103.39
2023.32    0.215   102.35
2023.42    0.207   101.23
2023.52    0.198   100.01
2023.62    0.189    98.67
2023.72    0.179    97.19
2023.82    0.169    95.53
2023.92    0.157    93.64
2024.02    0.146    91.46
2024.12    0.134    88.89
2024.22    0.121    85.81
2024.32    0.109    82.00
2024.42    0.096    77.20
2024.52    0.084    70.95
2024.62    0.072    62.60
2024.72    0.062    51.31
2024.82    0.055    36.39
2024.92    0.052    18.42
2025.02    0.054     0.08
2025.12    0.060   344.35
2025.22    0.069   332.26
2025.32    0.081   323.28
2025.42    0.092   316.54
2025.52    0.104   311.35
2025.62    0.116   307.22
2025.72    0.127   303.84
2025.82    0.138   300.99
2025.92    0.147   298.52
2026.02    0.156   296.34
2026.12    0.163   294.37
2026.22    0.170   292.56
2026.32    0.175   290.88
2026.42    0.179   289.28
2026.52    0.182   287.74
2026.62    0.184   286.25
2026.72    0.185   284.79
2026.82    0.186   283.33
2026.92    0.185   281.87
2027.02    0.184   280.40
2027.12    0.182   278.89
2027.22    0.179   277.35
2027.32    0.175   275.75
2027.42    0.171   274.08
2027.52    0.167   272.33
2027.62    0.162   270.48
2027.72    0.157   268.51
2027.82    0.152   266.40
2027.92    0.146   264.14
2028.02    0.140   261.69
2028.12    0.134   259.02
2028.22    0.128   256.11
2028.32    0.122   252.92
2028.42    0.117   249.41
2028.52    0.111   245.55
2028.62    0.106   241.29
2028.72    0.101   236.61
2028.82    0.097   231.50
2028.92    0.093   225.96
2029.02    0.091   220.03
2029.12    0.089   213.78
2029.22    0.088   207.32
2029.32    0.088   200.77
2029.42    0.089   194.30
2029.52    0.091   188.04
2029.62    0.093   182.10
2029.72    0.097   176.55
2029.82    0.101   171.43
2029.92    0.106   166.76
2030.02    0.112   162.52
2030.12    0.117   158.68
2030.22    0.123   155.22
2030.32    0.130   152.08
2030.42    0.136   149.24
2030.52    0.143   146.66
2030.62    0.149   144.31
2030.72    0.156   142.16

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 18:30:12