Double Star Calculator - Orbit

Orbital Elements for STT338AB

WDS:	STT338AB	WDS ID/Discoverer
P:	1276.600	Orbital period (years)
a:	1.14	Semi-major axis (arcseconds)
i:	124.2	Inclination (degrees)
Ω:	28.2	Longitude of ascending node (degrees)
T:	1799.900	Epoch of periastron passage (year)
e:	0.582	Eccentricity
ω:	111.1	Longitude of periastron (degrees)
Start-Year:	1386.7	Year
End-Year:	2663.3	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STT338AB
Position:	175158.46+151934.9	Epoch-2000 right ascension and declination
WDS-ID:	17520+1520	WDS designation
Discoverer Code:	STT338AB	Discover designation and components
ADS number:	10850	Aitken Double Star catalog
HD number:	162734	HD catalog number
Hipparcos number:	87427	Hipparcos catalog number
V1:	7.21	Magnitude of the primary
V2:	7.38	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2010	Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Pru2012	Reference

Double Star Orbit for STT338AB

WDS 6th Orbit including measures of STT338AB

-- 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 STT338AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.832   161.38
--------------------------
1386.70    1.305    59.20
1396.70    1.306    58.21
1406.70    1.307    57.23
1416.70    1.307    56.25
1426.70    1.306    55.27
1436.70    1.304    54.29
1446.70    1.301    53.30
1456.70    1.298    52.31
1466.70    1.293    51.31
1476.70    1.288    50.30
1486.70    1.281    49.29
1496.70    1.273    48.26
1506.70    1.265    47.22
1516.70    1.255    46.17
1526.70    1.243    45.09
1536.70    1.230    44.00
1546.70    1.216    42.88
1556.70    1.201    41.73
1566.70    1.183    40.55
1576.70    1.164    39.34
1586.70    1.144    38.08
1596.70    1.121    36.77
1606.70    1.096    35.41
1616.70    1.069    33.98
1626.70    1.040    32.48
1636.70    1.008    30.88
1646.70    0.973    29.17
1656.70    0.936    27.33
1666.70    0.896    25.34
1676.70    0.852    23.14
1686.70    0.805    20.70
1696.70    0.754    17.94
1706.70    0.700    14.77
1716.70    0.642    11.04
1726.70    0.580     6.55
1736.70    0.516     0.95
1746.70    0.450   353.73
1756.70    0.386   344.07
1766.70    0.329   330.79
1776.70    0.288   312.86
1786.70    0.274   291.17
1796.70    0.292   269.80
1806.70    0.334   252.43
1816.70    0.389   239.49
1826.70    0.446   229.84
1836.70    0.502   222.37
1846.70    0.552   216.33
1856.70    0.597   211.26
1866.70    0.635   206.84
1876.70    0.668   202.90
1886.70    0.696   199.30
1896.70    0.720   195.96
1906.70    0.740   192.81
1916.70    0.756   189.82
1926.70    0.770   186.95
1936.70    0.782   184.17
1946.70    0.792   181.47
1956.70    0.800   178.82
1966.70    0.807   176.23
1976.70    0.813   173.68
1986.70    0.818   171.16
1996.70    0.822   168.67
2006.70    0.826   166.20
2016.70    0.829   163.76
2026.70    0.832   161.33
2036.70    0.835   158.92
2046.70    0.838   156.53
2056.70    0.841   154.15
2066.70    0.844   151.80
2076.70    0.847   149.45
2086.70    0.850   147.13
2096.70    0.854   144.82
2106.70    0.858   142.53
2116.70    0.862   140.27
2126.70    0.867   138.03
2136.70    0.871   135.81
2146.70    0.877   133.61
2156.70    0.882   131.45
2166.70    0.888   129.31
2176.70    0.894   127.20
2186.70    0.901   125.12
2196.70    0.908   123.08
2206.70    0.916   121.06
2216.70    0.924   119.08
2226.70    0.932   117.13
2236.70    0.940   115.22
2246.70    0.949   113.34
2256.70    0.958   111.50
2266.70    0.967   109.69
2276.70    0.977   107.92
2286.70    0.987   106.18
2296.70    0.997   104.48
2306.70    1.007   102.81
2316.70    1.017   101.17
2326.70    1.028    99.57
2336.70    1.038    98.00
2346.70    1.049    96.46
2356.70    1.060    94.96
2366.70    1.071    93.48
2376.70    1.081    92.03
2386.70    1.092    90.61
2396.70    1.103    89.22
2406.70    1.114    87.86
2416.70    1.124    86.52
2426.70    1.135    85.21
2436.70    1.146    83.92
2446.70    1.156    82.66
2456.70    1.166    81.41
2466.70    1.176    80.19
2476.70    1.186    78.99
2486.70    1.196    77.81
2496.70    1.205    76.65
2506.70    1.214    75.50
2516.70    1.223    74.38
2526.70    1.232    73.26
2536.70    1.240    72.17
2546.70    1.248    71.08
2556.70    1.255    70.01
2566.70    1.262    68.96
2576.70    1.269    67.91
2586.70    1.275    66.87
2596.70    1.281    65.85
2606.70    1.286    64.83
2616.70    1.291    63.82
2626.70    1.295    62.82
2636.70    1.299    61.82
2646.70    1.302    60.83
2656.70    1.304    59.85

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 17:43:47