Double Star Calculator - Orbit

Orbital Elements for STF554

WDS:	STF554	WDS ID/Discoverer
P:	172.500	Orbital period (years)
a:	0.908	Semi-major axis (arcseconds)
i:	115.5	Inclination (degrees)
Ω:	10.8	Longitude of ascending node (degrees)
T:	1891.900	Epoch of periastron passage (year)
e:	0.915	Eccentricity
ω:	159.2	Longitude of periastron (degrees)
Start-Year:	1938.75	Year
End-Year:	2111.25	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STF554
Position:	043008.60+153816.2	Epoch-2000 right ascension and declination
WDS-ID:	04301+1538	WDS designation
Discoverer Code:	STF554	Discover designation and components
ADS number:	3264	Aitken Double Star catalog
HD number:	28485	HD catalog number
Hipparcos number:	20995	Hipparcos catalog number
V1:	5.70	Magnitude of the primary
V2:	8.12	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2018	Date of last observation
Orbit grade:	3	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Trr2019	Reference

Double Star Orbit for STF554

WDS 6th Orbit including measures of STF554

-- 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 STF554

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    1.351    14.16
--------------------------
1938.75    1.325    25.19
1939.75    1.340    25.02
1940.75    1.354    24.86
1941.75    1.368    24.70
1942.75    1.382    24.54
1943.75    1.395    24.38
1944.75    1.408    24.23
1945.75    1.420    24.08
1946.75    1.432    23.94
1947.75    1.444    23.79
1948.75    1.455    23.65
1949.75    1.466    23.51
1950.75    1.477    23.37
1951.75    1.487    23.24
1952.75    1.497    23.10
1953.75    1.507    22.97
1954.75    1.517    22.84
1955.75    1.526    22.71
1956.75    1.534    22.58
1957.75    1.543    22.46
1958.75    1.551    22.33
1959.75    1.559    22.21
1960.75    1.566    22.08
1961.75    1.573    21.96
1962.75    1.580    21.84
1963.75    1.587    21.72
1964.75    1.593    21.61
1965.75    1.599    21.49
1966.75    1.605    21.37
1967.75    1.610    21.26
1968.75    1.615    21.14
1969.75    1.620    21.03
1970.75    1.624    20.91
1971.75    1.628    20.80
1972.75    1.632    20.69
1973.75    1.635    20.58
1974.75    1.639    20.46
1975.75    1.641    20.35
1976.75    1.644    20.24
1977.75    1.646    20.13
1978.75    1.648    20.02
1979.75    1.650    19.91
1980.75    1.651    19.80
1981.75    1.652    19.69
1982.75    1.653    19.58
1983.75    1.653    19.47
1984.75    1.654    19.36
1985.75    1.653    19.26
1986.75    1.653    19.15
1987.75    1.652    19.04
1988.75    1.651    18.93
1989.75    1.649    18.82
1990.75    1.648    18.71
1991.75    1.646    18.60
1992.75    1.643    18.49
1993.75    1.640    18.38
1994.75    1.637    18.26
1995.75    1.634    18.15
1996.75    1.630    18.04
1997.75    1.626    17.93
1998.75    1.622    17.81
1999.75    1.617    17.70
2000.75    1.612    17.59
2001.75    1.607    17.47
2002.75    1.601    17.35
2003.75    1.595    17.24
2004.75    1.589    17.12
2005.75    1.582    17.00
2006.75    1.575    16.88
2007.75    1.567    16.76
2008.75    1.559    16.64
2009.75    1.551    16.51
2010.75    1.542    16.39
2011.75    1.533    16.26
2012.75    1.524    16.13
2013.75    1.514    16.00
2014.75    1.504    15.87
2015.75    1.493    15.74
2016.75    1.482    15.61
2017.75    1.471    15.47
2018.75    1.459    15.33
2019.75    1.446    15.19
2020.75    1.434    15.04
2021.75    1.420    14.90
2022.75    1.407    14.75
2023.75    1.392    14.59
2024.75    1.378    14.44
2025.75    1.363    14.28
2026.75    1.347    14.12
2027.75    1.331    13.95
2028.75    1.314    13.78
2029.75    1.297    13.60
2030.75    1.279    13.42
2031.75    1.260    13.24
2032.75    1.241    13.05
2033.75    1.222    12.85
2034.75    1.201    12.65
2035.75    1.180    12.44
2036.75    1.158    12.22
2037.75    1.136    11.99
2038.75    1.113    11.75
2039.75    1.089    11.51
2040.75    1.064    11.25
2041.75    1.039    10.98
2042.75    1.012    10.69
2043.75    0.985    10.39
2044.75    0.956    10.08
2045.75    0.927     9.74
2046.75    0.896     9.38
2047.75    0.864     8.99
2048.75    0.831     8.58
2049.75    0.797     8.13
2050.75    0.761     7.63
2051.75    0.723     7.09
2052.75    0.684     6.49
2053.75    0.642     5.81
2054.75    0.599     5.03
2055.75    0.553     4.13
2056.75    0.504     3.05
2057.75    0.452     1.74
2058.75    0.396     0.08
2059.75    0.335   357.83
2060.75    0.268   354.52
2061.75    0.194   348.82
2062.75    0.112   335.19
2063.75    0.046   263.83
2064.75    0.083   183.24
2065.75    0.079   138.25
2066.75    0.098    97.24
2067.75    0.137    74.61
2068.75    0.183    62.70
2069.75    0.229    55.58
2070.75    0.274    50.83
2071.75    0.318    47.41
2072.75    0.360    44.81
2073.75    0.401    42.75
2074.75    0.441    41.06
2075.75    0.478    39.64
2076.75    0.515    38.43
2077.75    0.551    37.37
2078.75    0.585    36.45
2079.75    0.618    35.62
2080.75    0.651    34.88
2081.75    0.682    34.21
2082.75    0.713    33.59
2083.75    0.743    33.03
2084.75    0.772    32.51
2085.75    0.800    32.02
2086.75    0.827    31.57
2087.75    0.854    31.15
2088.75    0.880    30.75
2089.75    0.905    30.38
2090.75    0.930    30.02
2091.75    0.954    29.68
2092.75    0.978    29.36
2093.75    1.001    29.06
2094.75    1.023    28.77
2095.75    1.045    28.49
2096.75    1.067    28.22
2097.75    1.088    27.96
2098.75    1.108    27.71
2099.75    1.128    27.47
2100.75    1.147    27.24
2101.75    1.166    27.02
2102.75    1.185    26.80
2103.75    1.203    26.59
2104.75    1.221    26.39
2105.75    1.238    26.19
2106.75    1.255    26.00
2107.75    1.271    25.81
2108.75    1.287    25.63
2109.75    1.303    25.45
2110.75    1.318    25.28

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 15:25:15