Double Star Calculator - Orbit

Orbital Elements for BEM7

WDS:	BEM7	WDS ID/Discoverer
P:	133535.000	Orbital period (years)
a:	16.5	Semi-major axis (arcseconds)
i:	102.0	Inclination (degrees)
Ω:	84.6	Longitude of ascending node (degrees)
T:	135137.000	Epoch of periastron passage (year)
e:	0.83	Eccentricity
ω:	276.0	Longitude of periastron (degrees)
Start-Year:	-64742.5	Year
End-Year:	68792.5	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BEM7
Position:	140507.51+491337.2	Epoch-2000 right ascension and declination
WDS-ID:	14051+4913	WDS designation
Discoverer Code:	BEM7	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	11.80	Magnitude of the primary
V2:	11.98	Magnitude of the secondary
Equinox:		Equinox
Date:		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:	Kiy2020	Reference

Double Star Orbit for BEM7

WDS 6th Orbit including measures of BEM7

-- 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 BEM7

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.445   106.28
--------------------------
-64742.50    7.039   327.05
-63742.50    7.144   325.36
-62742.50    7.253   323.72
-61742.50    7.364   322.12
-60742.50    7.479   320.58
-59742.50    7.596   319.08
-58742.50    7.715   317.63
-57742.50    7.837   316.22
-56742.50    7.960   314.85
-55742.50    8.084   313.53
-54742.50    8.210   312.25
-53742.50    8.336   311.00
-52742.50    8.463   309.80
-51742.50    8.590   308.63
-50742.50    8.718   307.49
-49742.50    8.845   306.39
-48742.50    8.972   305.31
-47742.50    9.099   304.27
-46742.50    9.224   303.26
-45742.50    9.348   302.27
-44742.50    9.471   301.31
-43742.50    9.593   300.37
-42742.50    9.713   299.46
-41742.50    9.830   298.57
-40742.50    9.946   297.70
-39742.50   10.058   296.85
-38742.50   10.168   296.01
-37742.50   10.275   295.20
-36742.50   10.379   294.40
-35742.50   10.479   293.62
-34742.50   10.574   292.85
-33742.50   10.666   292.10
-32742.50   10.753   291.35
-31742.50   10.835   290.62
-30742.50   10.912   289.90
-29742.50   10.984   289.19
-28742.50   11.049   288.49
-27742.50   11.107   287.80
-26742.50   11.159   287.11
-25742.50   11.203   286.43
-24742.50   11.239   285.76
-23742.50   11.266   285.08
-22742.50   11.284   284.41
-21742.50   11.291   283.75
-20742.50   11.288   283.08
-19742.50   11.272   282.41
-18742.50   11.244   281.74
-17742.50   11.201   281.06
-16742.50   11.143   280.38
-15742.50   11.067   279.69
-14742.50   10.973   278.99
-13742.50   10.858   278.28
-12742.50   10.719   277.55
-11742.50   10.553   276.79
-10742.50   10.358   276.01
-9742.50   10.128   275.20
-8742.50    9.858   274.35
-7742.50    9.542   273.45
-6742.50    9.170   272.48
-5742.50    8.729   271.41
-4742.50    8.205   270.23
-3742.50    7.574   268.86
-2742.50    6.800   267.22
-1742.50    5.829   265.08
-742.50    4.573   261.92
257.50    2.896   255.64
1257.50    0.823   219.40
2257.50    1.941    99.27
3257.50    3.765    88.04
4257.50    5.024    83.62
5257.50    5.903    80.77
6257.50    6.540    78.58
7257.50    7.014    76.73
8257.50    7.374    75.09
9257.50    7.648    73.58
10257.50    7.857    72.17
11257.50    8.015    70.82
12257.50    8.130    69.51
13257.50    8.212    68.24
14257.50    8.265    66.98
15257.50    8.295    65.74
16257.50    8.304    64.51
17257.50    8.296    63.27
18257.50    8.274    62.03
19257.50    8.239    60.78
20257.50    8.193    59.52
21257.50    8.137    58.25
22257.50    8.074    56.95
23257.50    8.003    55.63
24257.50    7.927    54.29
25257.50    7.846    52.92
26257.50    7.762    51.53
27257.50    7.673    50.10
28257.50    7.583    48.64
29257.50    7.491    47.14
30257.50    7.397    45.60
31257.50    7.303    44.03
32257.50    7.210    42.41
33257.50    7.116    40.75
34257.50    7.024    39.05
35257.50    6.934    37.30
36257.50    6.846    35.51
37257.50    6.760    33.67
38257.50    6.678    31.78
39257.50    6.599    29.85
40257.50    6.525    27.87
41257.50    6.454    25.85
42257.50    6.389    23.79
43257.50    6.329    21.68
44257.50    6.274    19.54
45257.50    6.225    17.36
46257.50    6.183    15.15
47257.50    6.147    12.91
48257.50    6.118    10.64
49257.50    6.096     8.36
50257.50    6.080     6.06
51257.50    6.073     3.76
52257.50    6.072     1.45
53257.50    6.079   359.14
54257.50    6.093   356.84
55257.50    6.115   354.56
56257.50    6.144   352.29
57257.50    6.180   350.05
58257.50    6.223   347.84
59257.50    6.272   345.66
60257.50    6.329   343.51
61257.50    6.391   341.41
62257.50    6.460   339.35
63257.50    6.535   337.33
64257.50    6.615   335.36
65257.50    6.700   333.44
66257.50    6.791   331.57
67257.50    6.885   329.75
68257.50    6.985   327.98

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 17:02:27