Double Star Calculator - Orbit

Orbital Elements for STF531

WDS:	STF531	WDS ID/Discoverer
P:	1107.566	Orbital period (years)
a:	1.63387	Semi-major axis (arcseconds)
i:	74.344	Inclination (degrees)
Ω:	112.911	Longitude of ascending node (degrees)
T:	1781.295	Epoch of periastron passage (year)
e:	0.64644	Eccentricity
ω:	101.967	Longitude of periastron (degrees)
Start-Year:	1471.21675	Year
End-Year:	2578.78325	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STF531
Position:	042646.23+553837.6	Epoch-2000 right ascension and declination
WDS-ID:	04268+5539	WDS designation
Discoverer Code:	STF531	Discover designation and components
ADS number:	3207	Aitken Double Star catalog
HD number:	27856	HD catalog number
Hipparcos number:	20748	Hipparcos catalog number
V1:	7.69	Magnitude of the primary
V2:	8.76	Magnitude of the secondary
Equinox:		Equinox
Date:	2014	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 STF531

WDS 6th Orbit including measures of STF531

-- 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 STF531

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.920   326.98
--------------------------
1471.22    1.464    92.99
1481.22    1.477    93.82
1491.22    1.489    94.63
1501.22    1.500    95.43
1511.22    1.509    96.22
1521.22    1.516    97.00
1531.22    1.521    97.77
1541.22    1.523    98.55
1551.22    1.524    99.31
1561.22    1.522   100.08
1571.22    1.518   100.86
1581.22    1.510   101.64
1591.22    1.500   102.42
1601.22    1.486   103.23
1611.22    1.469   104.04
1621.22    1.447   104.88
1631.22    1.421   105.75
1641.22    1.390   106.66
1651.22    1.353   107.61
1661.22    1.310   108.61
1671.22    1.261   109.69
1681.22    1.203   110.87
1691.22    1.136   112.18
1701.22    1.060   113.66
1711.22    0.971   115.39
1721.22    0.870   117.50
1731.22    0.753   120.22
1741.22    0.620   124.03
1751.22    0.471   130.13
1761.22    0.312   142.27
1771.22    0.177   176.25
1781.22    0.193   240.69
1791.22    0.336   269.02
1801.22    0.489   279.84
1811.22    0.624   285.66
1821.22    0.735   289.54
1831.22    0.825   292.47
1841.22    0.896   294.88
1851.22    0.952   296.97
1861.22    0.994   298.85
1871.22    1.026   300.60
1881.22    1.048   302.26
1891.22    1.063   303.86
1901.22    1.072   305.43
1911.22    1.076   306.97
1921.22    1.075   308.52
1931.22    1.070   310.07
1941.22    1.062   311.64
1951.22    1.052   313.24
1961.22    1.039   314.87
1971.22    1.024   316.55
1981.22    1.008   318.28
1991.22    0.990   320.07
2001.22    0.971   321.93
2011.22    0.951   323.87
2021.22    0.931   325.88
2031.22    0.911   327.99
2041.22    0.890   330.19
2051.22    0.869   332.50
2061.22    0.849   334.92
2071.22    0.829   337.46
2081.22    0.810   340.12
2091.22    0.792   342.91
2101.22    0.774   345.82
2111.22    0.758   348.87
2121.22    0.744   352.04
2131.22    0.731   355.33
2141.22    0.719   358.73
2151.22    0.710     2.23
2161.22    0.703     5.81
2171.22    0.698     9.46
2181.22    0.695    13.15
2191.22    0.694    16.86
2201.22    0.696    20.56
2211.22    0.700    24.23
2221.22    0.706    27.84
2231.22    0.715    31.38
2241.22    0.725    34.83
2251.22    0.738    38.17
2261.22    0.753    41.39
2271.22    0.769    44.47
2281.22    0.787    47.43
2291.22    0.806    50.25
2301.22    0.826    52.93
2311.22    0.848    55.48
2321.22    0.870    57.91
2331.22    0.894    60.20
2341.22    0.918    62.38
2351.22    0.943    64.45
2361.22    0.968    66.40
2371.22    0.993    68.26
2381.22    1.019    70.03
2391.22    1.045    71.70
2401.22    1.071    73.30
2411.22    1.098    74.82
2421.22    1.124    76.27
2431.22    1.149    77.65
2441.22    1.175    78.97
2451.22    1.200    80.24
2461.22    1.225    81.45
2471.22    1.250    82.62
2481.22    1.273    83.74
2491.22    1.297    84.83
2501.22    1.319    85.87
2511.22    1.341    86.88
2521.22    1.362    87.86
2531.22    1.382    88.81
2541.22    1.402    89.73
2551.22    1.420    90.62
2561.22    1.437    91.50
2571.22    1.453    92.36

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 15:24:04