Double Star Calculator - Orbit

Orbital Elements for STF2218
WDS: STF2218 WDS ID/Discoverer
P: 1051.158 Orbital period (years)
a: 3.04833 Semi-major axis (arcseconds)
i: 120.982 Inclination (degrees)
Ω: 93.827 Longitude of ascending node (degrees)
T: 2080.891 Epoch of periastron passage (year)
e: 0.82722 Eccentricity
ω: 254.754 Longitude of periastron (degrees)
Start-Year: 1499.42105 Year
End-Year: 2550.57895 Year
Epoch: 2026.5 Besselian Epoch
Further data from the WDS Sixth Catalog of Orbits for STF2218
Position: 174018.07+634031.4 Epoch-2000 right ascension and declination
WDS-ID: 17403+6341 WDS designation
Discoverer Code: STF2218 Discover designation and components
ADS number: 10728 Aitken Double Star catalog
HD number: 161285 HD catalog number
Hipparcos number: 86482 Hipparcos catalog number
V1: 7.08 Magnitude of the primary
V2: 8.37 Magnitude of the secondary
Equinox: Equinox
Date: 2015 Date of last observation
Orbit grade: 4 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 STF2218



WDS 6th Orbit including measures of STF2218

-- 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 STF2218
Click to expand/collapse ephemeris:
Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.352   304.13
--------------------------
1499.42    3.218    36.83
1509.42    3.205    35.93
1519.42    3.190    35.03
1529.42    3.175    34.12
1539.42    3.158    33.21
1549.42    3.141    32.28
1559.42    3.122    31.34
1569.42    3.103    30.39
1579.42    3.083    29.43
1589.42    3.061    28.45
1599.42    3.039    27.46
1609.42    3.016    26.46
1619.42    2.992    25.44
1629.42    2.967    24.40
1639.42    2.941    23.35
1649.42    2.915    22.27
1659.42    2.887    21.18
1669.42    2.859    20.06
1679.42    2.831    18.93
1689.42    2.801    17.77
1699.42    2.771    16.58
1709.42    2.740    15.37
1719.42    2.708    14.13
1729.42    2.676    12.86
1739.42    2.643    11.56
1749.42    2.610    10.22
1759.42    2.576     8.85
1769.42    2.541     7.45
1779.42    2.506     6.00
1789.42    2.470     4.51
1799.42    2.434     2.98
1809.42    2.397     1.41
1819.42    2.360   359.78
1829.42    2.322   358.10
1839.42    2.283   356.36
1849.42    2.244   354.56
1859.42    2.205   352.70
1869.42    2.164   350.78
1879.42    2.124   348.77
1889.42    2.083   346.69
1899.42    2.041   344.53
1909.42    1.998   342.27
1919.42    1.954   339.91
1929.42    1.910   337.45
1939.42    1.865   334.86
1949.42    1.818   332.15
1959.42    1.769   329.29
1969.42    1.719   326.26
1979.42    1.666   323.05
1989.42    1.610   319.62
1999.42    1.550   315.93
2009.42    1.484   311.93
2019.42    1.411   307.54
2029.42    1.326   302.63
2039.42    1.225   296.98
2049.42    1.097   290.16
2059.42    0.926   281.19
2069.42    0.674   266.76
2079.42    0.332   225.59
2089.42    0.437   131.51
2099.42    0.819   106.04
2109.42    1.132    96.23
2119.42    1.385    90.40
2129.42    1.594    86.24
2139.42    1.773    83.00
2149.42    1.928    80.31
2159.42    2.064    78.00
2169.42    2.186    75.96
2179.42    2.295    74.13
2189.42    2.393    72.45
2199.42    2.482    70.90
2209.42    2.563    69.46
2219.42    2.637    68.10
2229.42    2.705    66.81
2239.42    2.766    65.58
2249.42    2.823    64.40
2259.42    2.875    63.26
2269.42    2.923    62.17
2279.42    2.966    61.11
2289.42    3.006    60.07
2299.42    3.042    59.07
2309.42    3.075    58.08
2319.42    3.105    57.12
2329.42    3.132    56.17
2339.42    3.157    55.24
2349.42    3.179    54.33
2359.42    3.198    53.42
2369.42    3.215    52.53
2379.42    3.230    51.64
2389.42    3.243    50.76
2399.42    3.254    49.89
2409.42    3.262    49.02
2419.42    3.269    48.16
2429.42    3.275    47.30
2439.42    3.278    46.44
2449.42    3.280    45.59
2459.42    3.280    44.73
2469.42    3.279    43.87
2479.42    3.276    43.02
2489.42    3.272    42.16
2499.42    3.266    41.30
2509.42    3.260    40.43
2519.42    3.251    39.57
2529.42    3.242    38.69
2539.42    3.231    37.81
2549.42    3.219    36.93






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 17:41:52



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