Double Star Calculator - Orbit

Orbital Elements for BU838
WDS: BU838 WDS ID/Discoverer
P: 1023.389 Orbital period (years)
a: 5.36256 Semi-major axis (arcseconds)
i: 77.217 Inclination (degrees)
Ω: 169.101 Longitude of ascending node (degrees)
T: 2050.745 Epoch of periastron passage (year)
e: 0.85848 Eccentricity
ω: 68.921 Longitude of periastron (degrees)
Start-Year: 1513.30565 Year
End-Year: 2536.6943499999998 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for BU838
Position: 212055.78+030705.6 Epoch-2000 right ascension and declination
WDS-ID: 21209+0307 WDS designation
Discoverer Code: BU838 Discover designation and components
ADS number: 14880 Aitken Double Star catalog
HD number: 203235 HD catalog number
Hipparcos number: 105399 Hipparcos catalog number
V1: 7.92 Magnitude of the primary
V2: 10.02 Magnitude of the secondary
Equinox: Equinox
Date: 2007 Date of last observation
Orbit grade: 5 Orbit grade, ranging from :
1 = Definitive
2 = Good
3 = Reliable
4 = Preliminary
5 = Indeterminate
Flags: Flags
Ephemerides: Ephemerides
Code: Izm2019 Reference

Double Star Orbit for BU838



WDS 6th Orbit including measures of BU838

-- 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 BU838
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.497   159.51
--------------------------
1513.31    4.307    17.30
1523.31    4.241    17.93
1533.31    4.173    18.58
1543.31    4.103    19.25
1553.31    4.031    19.94
1563.31    3.958    20.66
1573.31    3.883    21.41
1583.31    3.806    22.18
1593.31    3.728    22.99
1603.31    3.648    23.84
1613.31    3.567    24.72
1623.31    3.485    25.64
1633.31    3.401    26.61
1643.31    3.317    27.63
1653.31    3.231    28.70
1663.31    3.144    29.83
1673.31    3.057    31.02
1683.31    2.969    32.29
1693.31    2.880    33.63
1703.31    2.791    35.06
1713.31    2.702    36.58
1723.31    2.613    38.20
1733.31    2.524    39.94
1743.31    2.436    41.81
1753.31    2.348    43.82
1763.31    2.262    45.98
1773.31    2.176    48.31
1783.31    2.093    50.83
1793.31    2.012    53.56
1803.31    1.934    56.51
1813.31    1.859    59.70
1823.31    1.789    63.15
1833.31    1.723    66.88
1843.31    1.663    70.89
1853.31    1.609    75.18
1863.31    1.562    79.75
1873.31    1.524    84.58
1883.31    1.494    89.62
1893.31    1.473    94.85
1903.31    1.461   100.19
1913.31    1.458   105.58
1923.31    1.465   110.96
1933.31    1.479   116.26
1943.31    1.501   121.44
1953.31    1.527   126.45
1963.31    1.557   131.27
1973.31    1.588   135.92
1983.31    1.615   140.39
1993.31    1.635   144.73
2003.31    1.638   149.01
2013.31    1.614   153.33
2023.31    1.539   157.92
2033.31    1.361   163.31
2043.31    0.940   171.81
2053.31    0.175   265.57
2063.31    1.052   341.40
2073.31    1.754   347.44
2083.31    2.274   350.29
2093.31    2.683   352.16
2103.31    3.018   353.57
2113.31    3.301   354.72
2123.31    3.543   355.70
2133.31    3.752   356.57
2143.31    3.936   357.34
2153.31    4.097   358.05
2163.31    4.239   358.71
2173.31    4.365   359.33
2183.31    4.477   359.92
2193.31    4.576     0.48
2203.31    4.663     1.02
2213.31    4.740     1.54
2223.31    4.807     2.04
2233.31    4.865     2.53
2243.31    4.916     3.01
2253.31    4.959     3.48
2263.31    4.995     3.95
2273.31    5.025     4.40
2283.31    5.048     4.86
2293.31    5.066     5.30
2303.31    5.078     5.75
2313.31    5.086     6.19
2323.31    5.088     6.64
2333.31    5.086     7.08
2343.31    5.080     7.53
2353.31    5.069     7.97
2363.31    5.055     8.42
2373.31    5.037     8.87
2383.31    5.015     9.32
2393.31    4.989     9.78
2403.31    4.960    10.25
2413.31    4.928    10.72
2423.31    4.893    11.19
2433.31    4.855    11.68
2443.31    4.814    12.17
2453.31    4.770    12.67
2463.31    4.723    13.18
2473.31    4.674    13.70
2483.31    4.622    14.23
2493.31    4.568    14.77
2503.31    4.512    15.33
2513.31    4.453    15.90
2523.31    4.392    16.49
2533.31    4.329    17.09






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 18:25:16



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