Double Star Calculator - Orbit

Orbital Elements for STF1989

WDS:	STF1989	WDS ID/Discoverer
P:	171.620	Orbital period (years)
a:	0.464	Semi-major axis (arcseconds)
i:	135.2	Inclination (degrees)
Ω:	123.4	Longitude of ascending node (degrees)
T:	1904.150	Epoch of periastron passage (year)
e:	0.961	Eccentricity
ω:	274.0	Longitude of periastron (degrees)
Start-Year:	1939.19	Year
End-Year:	2110.81	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STF1989
Position:	153938.61+795859.6	Epoch-2000 right ascension and declination
WDS-ID:	15396+7959	WDS designation
Discoverer Code:	STF1989	Discover designation and components
ADS number:	9769	Aitken Double Star catalog
HD number:	141652	HD catalog number
Hipparcos number:	76695	Hipparcos catalog number
V1:	7.32	Magnitude of the primary
V2:	8.15	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2004	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:	Hrt2008	Reference

Double Star Orbit for STF1989

WDS 6th Orbit including measures of STF1989

-- 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 STF1989

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.577    19.46
--------------------------
1939.19    0.493    40.65
1940.19    0.500    40.29
1941.19    0.506    39.94
1942.19    0.512    39.60
1943.19    0.518    39.27
1944.19    0.524    38.94
1945.19    0.529    38.62
1946.19    0.535    38.31
1947.19    0.540    38.00
1948.19    0.545    37.70
1949.19    0.550    37.40
1950.19    0.555    37.11
1951.19    0.559    36.83
1952.19    0.564    36.55
1953.19    0.568    36.27
1954.19    0.573    36.00
1955.19    0.577    35.73
1956.19    0.581    35.46
1957.19    0.585    35.20
1958.19    0.588    34.95
1959.19    0.592    34.69
1960.19    0.596    34.44
1961.19    0.599    34.19
1962.19    0.602    33.95
1963.19    0.605    33.70
1964.19    0.608    33.46
1965.19    0.611    33.22
1966.19    0.614    32.99
1967.19    0.617    32.75
1968.19    0.619    32.52
1969.19    0.622    32.29
1970.19    0.624    32.06
1971.19    0.626    31.84
1972.19    0.628    31.61
1973.19    0.630    31.39
1974.19    0.632    31.16
1975.19    0.634    30.94
1976.19    0.635    30.72
1977.19    0.637    30.50
1978.19    0.638    30.29
1979.19    0.640    30.07
1980.19    0.641    29.85
1981.19    0.642    29.64
1982.19    0.643    29.42
1983.19    0.644    29.21
1984.19    0.645    29.00
1985.19    0.645    28.78
1986.19    0.646    28.57
1987.19    0.646    28.36
1988.19    0.647    28.15
1989.19    0.647    27.93
1990.19    0.647    27.72
1991.19    0.647    27.51
1992.19    0.647    27.30
1993.19    0.647    27.09
1994.19    0.647    26.88
1995.19    0.646    26.66
1996.19    0.646    26.45
1997.19    0.645    26.24
1998.19    0.645    26.03
1999.19    0.644    25.81
2000.19    0.643    25.60
2001.19    0.642    25.38
2002.19    0.641    25.17
2003.19    0.639    24.95
2004.19    0.638    24.73
2005.19    0.637    24.52
2006.19    0.635    24.30
2007.19    0.633    24.08
2008.19    0.631    23.86
2009.19    0.630    23.63
2010.19    0.628    23.41
2011.19    0.625    23.18
2012.19    0.623    22.95
2013.19    0.621    22.73
2014.19    0.618    22.49
2015.19    0.616    22.26
2016.19    0.613    22.03
2017.19    0.610    21.79
2018.19    0.607    21.55
2019.19    0.604    21.31
2020.19    0.601    21.06
2021.19    0.597    20.82
2022.19    0.594    20.57
2023.19    0.590    20.32
2024.19    0.587    20.06
2025.19    0.583    19.80
2026.19    0.579    19.54
2027.19    0.575    19.27
2028.19    0.570    19.00
2029.19    0.566    18.73
2030.19    0.561    18.45
2031.19    0.557    18.16
2032.19    0.552    17.87
2033.19    0.547    17.58
2034.19    0.542    17.28
2035.19    0.536    16.98
2036.19    0.531    16.66
2037.19    0.525    16.35
2038.19    0.519    16.02
2039.19    0.513    15.69
2040.19    0.507    15.35
2041.19    0.501    15.00
2042.19    0.494    14.64
2043.19    0.487    14.27
2044.19    0.480    13.89
2045.19    0.473    13.51
2046.19    0.466    13.10
2047.19    0.458    12.69
2048.19    0.451    12.26
2049.19    0.443    11.82
2050.19    0.434    11.35
2051.19    0.426    10.88
2052.19    0.417    10.38
2053.19    0.408     9.86
2054.19    0.399     9.31
2055.19    0.389     8.74
2056.19    0.379     8.14
2057.19    0.369     7.50
2058.19    0.358     6.83
2059.19    0.347     6.12
2060.19    0.335     5.36
2061.19    0.324     4.54
2062.19    0.311     3.66
2063.19    0.298     2.71
2064.19    0.285     1.66
2065.19    0.271     0.52
2066.19    0.256   359.24
2067.19    0.240   357.79
2068.19    0.224   356.14
2069.19    0.206   354.22
2070.19    0.187   351.92
2071.19    0.166   349.08
2072.19    0.144   345.38
2073.19    0.118   340.18
2074.19    0.087   331.67
2075.19    0.046   310.59
2076.19    0.037   118.82
2077.19    0.078    90.06
2078.19    0.108    79.73
2079.19    0.133    73.60
2080.19    0.155    69.33
2081.19    0.175    66.08
2082.19    0.194    63.48
2083.19    0.211    61.32
2084.19    0.228    59.48
2085.19    0.243    57.87
2086.19    0.258    56.46
2087.19    0.272    55.19
2088.19    0.285    54.05
2089.19    0.298    53.01
2090.19    0.310    52.05
2091.19    0.322    51.16
2092.19    0.334    50.34
2093.19    0.345    49.57
2094.19    0.355    48.84
2095.19    0.366    48.16
2096.19    0.376    47.52
2097.19    0.385    46.90
2098.19    0.395    46.32
2099.19    0.404    45.77
2100.19    0.413    45.24
2101.19    0.422    44.73
2102.19    0.430    44.24
2103.19    0.438    43.77
2104.19    0.446    43.31
2105.19    0.454    42.88
2106.19    0.461    42.45
2107.19    0.468    42.04
2108.19    0.476    41.64
2109.19    0.482    41.26
2110.19    0.489    40.88

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 17:18:06