Double Star Calculator - Orbit

Orbital Elements for STT77AB

WDS:	STT77AB	WDS ID/Discoverer
P:	188.810	Orbital period (years)
a:	0.565	Semi-major axis (arcseconds)
i:	56.5	Inclination (degrees)
Ω:	74.3	Longitude of ascending node (degrees)
T:	2075.360	Epoch of periastron passage (year)
e:	0.44	Eccentricity
ω:	31.1	Longitude of periastron (degrees)
Start-Year:	1930.595	Year
End-Year:	2119.405	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STT77AB
Position:	041555.73+314135.1	Epoch-2000 right ascension and declination
WDS-ID:	04159+3142	WDS designation
Discoverer Code:	STT77AB	Discover designation and components
ADS number:	3082	Aitken Double Star catalog
HD number:	26842	HD catalog number
Hipparcos number:	19883	Hipparcos catalog number
V1:	8.04	Magnitude of the primary
V2:	8.22	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2023	Date of last observation
Orbit grade:	2	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Sca2023a	Reference

Double Star Orbit for STT77AB

WDS 6th Orbit including measures of STT77AB

-- 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 STT77AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.403   316.53
--------------------------
1930.60    0.621   244.32
1931.60    0.630   245.09
1932.60    0.640   245.84
1933.60    0.649   246.57
1934.60    0.657   247.28
1935.60    0.665   247.97
1936.60    0.673   248.64
1937.60    0.681   249.30
1938.60    0.688   249.94
1939.60    0.695   250.57
1940.60    0.702   251.19
1941.60    0.708   251.80
1942.60    0.714   252.40
1943.60    0.719   252.98
1944.60    0.725   253.56
1945.60    0.730   254.13
1946.60    0.734   254.70
1947.60    0.739   255.25
1948.60    0.743   255.80
1949.60    0.747   256.35
1950.60    0.750   256.88
1951.60    0.753   257.42
1952.60    0.756   257.95
1953.60    0.759   258.47
1954.60    0.761   259.00
1955.60    0.763   259.51
1956.60    0.765   260.03
1957.60    0.767   260.54
1958.60    0.768   261.06
1959.60    0.769   261.57
1960.60    0.770   262.08
1961.60    0.771   262.58
1962.60    0.771   263.09
1963.60    0.771   263.60
1964.60    0.771   264.11
1965.60    0.770   264.62
1966.60    0.770   265.12
1967.60    0.769   265.63
1968.60    0.767   266.15
1969.60    0.766   266.66
1970.60    0.764   267.17
1971.60    0.762   267.69
1972.60    0.760   268.21
1973.60    0.758   268.74
1974.60    0.755   269.26
1975.60    0.753   269.79
1976.60    0.750   270.33
1977.60    0.747   270.87
1978.60    0.743   271.41
1979.60    0.740   271.96
1980.60    0.736   272.51
1981.60    0.732   273.07
1982.60    0.727   273.64
1983.60    0.723   274.21
1984.60    0.718   274.80
1985.60    0.714   275.38
1986.60    0.709   275.98
1987.60    0.703   276.59
1988.60    0.698   277.20
1989.60    0.692   277.82
1990.60    0.687   278.46
1991.60    0.681   279.10
1992.60    0.675   279.76
1993.60    0.669   280.43
1994.60    0.662   281.11
1995.60    0.656   281.81
1996.60    0.649   282.52
1997.60    0.642   283.24
1998.60    0.635   283.98
1999.60    0.628   284.74
2000.60    0.620   285.51
2001.60    0.613   286.30
2002.60    0.605   287.12
2003.60    0.598   287.95
2004.60    0.590   288.81
2005.60    0.582   289.69
2006.60    0.574   290.59
2007.60    0.566   291.52
2008.60    0.557   292.48
2009.60    0.549   293.46
2010.60    0.540   294.48
2011.60    0.532   295.53
2012.60    0.523   296.61
2013.60    0.515   297.73
2014.60    0.506   298.89
2015.60    0.497   300.09
2016.60    0.489   301.33
2017.60    0.480   302.62
2018.60    0.471   303.95
2019.60    0.462   305.34
2020.60    0.454   306.78
2021.60    0.445   308.27
2022.60    0.436   309.83
2023.60    0.428   311.45
2024.60    0.419   313.13
2025.60    0.411   314.88
2026.60    0.403   316.71
2027.60    0.395   318.60
2028.60    0.387   320.58
2029.60    0.379   322.64
2030.60    0.372   324.78
2031.60    0.364   327.01
2032.60    0.358   329.33
2033.60    0.351   331.73
2034.60    0.345   334.22
2035.60    0.339   336.80
2036.60    0.334   339.47
2037.60    0.329   342.22
2038.60    0.324   345.05
2039.60    0.320   347.95
2040.60    0.317   350.93
2041.60    0.314   353.96
2042.60    0.312   357.04
2043.60    0.310     0.17
2044.60    0.308     3.33
2045.60    0.308     6.51
2046.60    0.308     9.70
2047.60    0.308    12.89
2048.60    0.309    16.06
2049.60    0.310    19.22
2050.60    0.312    22.34
2051.60    0.314    25.43
2052.60    0.316    28.47
2053.60    0.319    31.47
2054.60    0.321    34.41
2055.60    0.324    37.31
2056.60    0.327    40.15
2057.60    0.330    42.94
2058.60    0.333    45.68
2059.60    0.336    48.38
2060.60    0.338    51.04
2061.60    0.340    53.66
2062.60    0.341    56.26
2063.60    0.342    58.84
2064.60    0.342    61.42
2065.60    0.342    63.99
2066.60    0.340    66.58
2067.60    0.338    69.20
2068.60    0.335    71.87
2069.60    0.330    74.59
2070.60    0.325    77.40
2071.60    0.319    80.31
2072.60    0.311    83.36
2073.60    0.303    86.56
2074.60    0.293    89.96
2075.60    0.283    93.59
2076.60    0.272    97.50
2077.60    0.261   101.74
2078.60    0.250   106.34
2079.60    0.240   111.37
2080.60    0.229   116.86
2081.60    0.220   122.84
2082.60    0.212   129.29
2083.60    0.206   136.18
2084.60    0.203   143.41
2085.60    0.201   150.83
2086.60    0.202   158.26
2087.60    0.206   165.53
2088.60    0.212   172.48
2089.60    0.220   178.98
2090.60    0.230   184.96
2091.60    0.241   190.41
2092.60    0.254   195.34
2093.60    0.268   199.78
2094.60    0.282   203.78
2095.60    0.297   207.38
2096.60    0.313   210.62
2097.60    0.328   213.56
2098.60    0.344   216.23
2099.60    0.360   218.67
2100.60    0.376   220.90
2101.60    0.391   222.95
2102.60    0.407   224.85
2103.60    0.422   226.60
2104.60    0.437   228.24
2105.60    0.452   229.77
2106.60    0.466   231.20
2107.60    0.480   232.55
2108.60    0.494   233.82
2109.60    0.507   235.02
2110.60    0.521   236.16
2111.60    0.533   237.25
2112.60    0.546   238.29
2113.60    0.558   239.28
2114.60    0.570   240.23
2115.60    0.581   241.14
2116.60    0.592   242.02
2117.60    0.602   242.86
2118.60    0.613   243.68

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 15:19:43