Content-Type: text/html; charset=UTF-8 Double Star Calculator - Orbital Elements

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:01:06

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:	1939.0	Year
End-Year:	2111.0	Year
Epoch:	2025.0	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' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for STF554

WDS 6th Orbit including measures of STF554

Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements)

Ephemeris of STF554

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.374     14.4
-------------------------
1939.0     1.329     25.1
1940.0     1.344     25.0
1941.0     1.358     24.8
1942.0     1.372     24.7
1943.0     1.385     24.5
1944.0     1.398     24.3
1945.0     1.411     24.2
1946.0     1.423     24.0
1947.0     1.435     23.9
1948.0     1.447     23.8
1949.0     1.458     23.6
1950.0     1.469     23.5
1951.0     1.480     23.3
1952.0     1.490     23.2
1953.0     1.500     23.1
1954.0     1.510     22.9
1955.0     1.519     22.8
1956.0     1.528     22.7
1957.0     1.537     22.5
1958.0     1.545     22.4
1959.0     1.553     22.3
1960.0     1.561     22.2
1961.0     1.568     22.1
1962.0     1.575     21.9
1963.0     1.582     21.8
1964.0     1.588     21.7
1965.0     1.595     21.6
1966.0     1.600     21.5
1967.0     1.606     21.3
1968.0     1.611     21.2
1969.0     1.616     21.1
1970.0     1.621     21.0
1971.0     1.625     20.9
1972.0     1.629     20.8
1973.0     1.633     20.7
1974.0     1.636     20.5
1975.0     1.639     20.4
1976.0     1.642     20.3
1977.0     1.645     20.2
1978.0     1.647     20.1
1979.0     1.649     20.0
1980.0     1.650     19.9
1981.0     1.652     19.8
1982.0     1.652     19.7
1983.0     1.653     19.6
1984.0     1.653     19.4
1985.0     1.654     19.3
1986.0     1.653     19.2
1987.0     1.653     19.1
1988.0     1.652     19.0
1989.0     1.651     18.9
1990.0     1.649     18.8
1991.0     1.647     18.7
1992.0     1.645     18.6
1993.0     1.643     18.5
1994.0     1.640     18.3
1995.0     1.637     18.2
1996.0     1.633     18.1
1997.0     1.629     18.0
1998.0     1.625     17.9
1999.0     1.621     17.8
2000.0     1.616     17.7
2001.0     1.611     17.6
2002.0     1.605     17.4
2003.0     1.600     17.3
2004.0     1.593     17.2
2005.0     1.587     17.1
2006.0     1.580     17.0
2007.0     1.573     16.9
2008.0     1.565     16.7
2009.0     1.557     16.6
2010.0     1.549     16.5
2011.0     1.540     16.4
2012.0     1.531     16.2
2013.0     1.521     16.1
2014.0     1.512     16.0
2015.0     1.501     15.8
2016.0     1.490     15.7
2017.0     1.479     15.6
2018.0     1.468     15.4
2019.0     1.456     15.3
2020.0     1.443     15.2
2021.0     1.430     15.0
2022.0     1.417     14.9
2023.0     1.403     14.7
2024.0     1.389     14.6
2025.0     1.374     14.4
2026.0     1.359     14.2
2027.0     1.343     14.1
2028.0     1.327     13.9
2029.0     1.310     13.7
2030.0     1.292     13.6
2031.0     1.274     13.4
2032.0     1.256     13.2
2033.0     1.236     13.0
2034.0     1.216     12.8
2035.0     1.196     12.6
2036.0     1.175     12.4
2037.0     1.153     12.2
2038.0     1.130     11.9
2039.0     1.107     11.7
2040.0     1.083     11.4
2041.0     1.058     11.2
2042.0     1.032     10.9
2043.0     1.005     10.6
2044.0     0.978     10.3
2045.0     0.949     10.0
2046.0     0.919      9.7
2047.0     0.888      9.3
2048.0     0.856      8.9
2049.0     0.823      8.5
2050.0     0.788      8.0
2051.0     0.751      7.5
2052.0     0.713      6.9
2053.0     0.673      6.3
2054.0     0.632      5.6
2055.0     0.588      4.8
2056.0     0.541      3.9
2057.0     0.491      2.8
2058.0     0.438      1.4
2059.0     0.381    359.6
2060.0     0.319    357.1
2061.0     0.251    353.4
2062.0     0.175    346.6
2063.0     0.090    327.8
2064.0     0.052    231.4
2065.0     0.083    172.5
2066.0     0.081    126.6
2067.0     0.106     90.0
2068.0     0.149     70.9
2069.0     0.195     60.6
2070.0     0.241     54.2
2071.0     0.286     49.9
2072.0     0.329     46.7
2073.0     0.371     44.3
2074.0     0.411     42.3
2075.0     0.450     40.7
2076.0     0.488     39.3
2077.0     0.524     38.2
2078.0     0.559     37.1
2079.0     0.594     36.2
2080.0     0.627     35.4
2081.0     0.659     34.7
2082.0     0.690     34.0
2083.0     0.720     33.4
2084.0     0.750     32.9
2085.0     0.779     32.4
2086.0     0.807     31.9
2087.0     0.834     31.5
2088.0     0.860     31.0
2089.0     0.886     30.7
2090.0     0.912     30.3
2091.0     0.936     29.9
2092.0     0.960     29.6
2093.0     0.984     29.3
2094.0     1.007     29.0
2095.0     1.029     28.7
2096.0     1.051     28.4
2097.0     1.072     28.2
2098.0     1.093     27.9
2099.0     1.113     27.7
2100.0     1.133     27.4
2101.0     1.152     27.2
2102.0     1.171     27.0
2103.0     1.189     26.8
2104.0     1.207     26.5
2105.0     1.225     26.3
2106.0     1.242     26.1
2107.0     1.259     26.0
2108.0     1.275     25.8
2109.0     1.291     25.6
2110.0     1.307     25.4

Disclaimer

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.