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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:12:57

Orbital Elements for HLD158

WDS:	HLD158	WDS ID/Discoverer
P:	232.400	Orbital period (years)
a:	0.858	Semi-major axis (arcseconds)
i:	128.6	Inclination (degrees)
Ω:	218.3	Longitude of ascending node (degrees)
T:	1961.160	Epoch of periastron passage (year)
e:	0.746	Eccentricity
ω:	17.7	Longitude of periastron (degrees)
Start-Year:	1909.0	Year
End-Year:	2141.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HLD158

Position:	202117.43+025021.9	Epoch-2000 right ascension and declination
WDS-ID:	20213+0250	WDS designation
Discoverer Code:	HLD158	Discover designation and components
ADS number:	13738	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	100355	Hipparcos catalog number
V1:	9.71	Magnitude of the primary
V2:	9.78	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2016	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HLD158

WDS 6th Orbit including measures of HLD158

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

Ephemeris of HLD158

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.278     39.5
-------------------------
1909.0     0.981      7.8
1910.0     0.967      7.3
1911.0     0.954      6.8
1912.0     0.939      6.3
1913.0     0.925      5.7
1914.0     0.910      5.2
1915.0     0.896      4.6
1916.0     0.881      4.0
1917.0     0.865      3.4
1918.0     0.850      2.7
1919.0     0.834      2.1
1920.0     0.818      1.4
1921.0     0.802      0.6
1922.0     0.786    359.9
1923.0     0.769    359.1
1924.0     0.752    358.3
1925.0     0.735    357.4
1926.0     0.718    356.5
1927.0     0.700    355.6
1928.0     0.683    354.6
1929.0     0.665    353.6
1930.0     0.647    352.5
1931.0     0.628    351.3
1932.0     0.610    350.1
1933.0     0.591    348.7
1934.0     0.572    347.3
1935.0     0.553    345.8
1936.0     0.534    344.2
1937.0     0.514    342.5
1938.0     0.495    340.7
1939.0     0.476    338.6
1940.0     0.456    336.5
1941.0     0.437    334.1
1942.0     0.418    331.5
1943.0     0.399    328.6
1944.0     0.380    325.5
1945.0     0.361    322.1
1946.0     0.344    318.2
1947.0     0.326    314.0
1948.0     0.310    309.3
1949.0     0.295    304.1
1950.0     0.281    298.4
1951.0     0.269    292.2
1952.0     0.259    285.4
1953.0     0.251    278.1
1954.0     0.245    270.3
1955.0     0.240    262.3
1956.0     0.237    254.0
1957.0     0.235    245.5
1958.0     0.233    236.8
1959.0     0.229    227.9
1960.0     0.223    218.7
1961.0     0.213    208.7
1962.0     0.202    197.7
1963.0     0.190    185.4
1964.0     0.181    171.5
1965.0     0.177    156.6
1966.0     0.182    141.8
1967.0     0.194    128.2
1968.0     0.212    116.6
1969.0     0.235    107.1
1970.0     0.261     99.3
1971.0     0.289     93.1
1972.0     0.318     87.9
1973.0     0.347     83.6
1974.0     0.376     80.0
1975.0     0.405     76.8
1976.0     0.434     74.2
1977.0     0.462     71.8
1978.0     0.490     69.7
1979.0     0.517     67.8
1980.0     0.544     66.1
1981.0     0.570     64.6
1982.0     0.595     63.2
1983.0     0.620     61.9
1984.0     0.644     60.7
1985.0     0.668     59.6
1986.0     0.691     58.6
1987.0     0.714     57.7
1988.0     0.736     56.8
1989.0     0.758     55.9
1990.0     0.779     55.1
1991.0     0.800     54.3
1992.0     0.820     53.6
1993.0     0.840     52.9
1994.0     0.859     52.3
1995.0     0.878     51.7
1996.0     0.896     51.0
1997.0     0.914     50.5
1998.0     0.932     49.9
1999.0     0.949     49.4
2000.0     0.966     48.9
2001.0     0.982     48.4
2002.0     0.998     47.9
2003.0     1.014     47.4
2004.0     1.029     47.0
2005.0     1.044     46.5
2006.0     1.059     46.1
2007.0     1.073     45.7
2008.0     1.087     45.3
2009.0     1.100     44.9
2010.0     1.114     44.5
2011.0     1.127     44.1
2012.0     1.139     43.7
2013.0     1.152     43.4
2014.0     1.164     43.0
2015.0     1.176     42.7
2016.0     1.187     42.3
2017.0     1.198     42.0
2018.0     1.209     41.7
2019.0     1.220     41.4
2020.0     1.230     41.0
2021.0     1.240     40.7
2022.0     1.250     40.4
2023.0     1.260     40.1
2024.0     1.269     39.8
2025.0     1.278     39.5
2026.0     1.287     39.2
2027.0     1.296     39.0
2028.0     1.304     38.7
2029.0     1.312     38.4
2030.0     1.320     38.1
2031.0     1.328     37.9
2032.0     1.335     37.6
2033.0     1.342     37.3
2034.0     1.349     37.1
2035.0     1.356     36.8
2036.0     1.362     36.6
2037.0     1.369     36.3
2038.0     1.375     36.0
2039.0     1.381     35.8
2040.0     1.386     35.5
2041.0     1.392     35.3
2042.0     1.397     35.1
2043.0     1.402     34.8
2044.0     1.407     34.6
2045.0     1.411     34.3
2046.0     1.416     34.1
2047.0     1.420     33.9
2048.0     1.424     33.6
2049.0     1.427     33.4
2050.0     1.431     33.2
2051.0     1.434     32.9
2052.0     1.438     32.7
2053.0     1.441     32.5
2054.0     1.443     32.2
2055.0     1.446     32.0
2056.0     1.448     31.8
2057.0     1.451     31.6
2058.0     1.453     31.3
2059.0     1.454     31.1
2060.0     1.456     30.9
2061.0     1.457     30.7
2062.0     1.459     30.5
2063.0     1.460     30.2
2064.0     1.461     30.0
2065.0     1.461     29.8
2066.0     1.462     29.6
2067.0     1.462     29.3
2068.0     1.462     29.1
2069.0     1.462     28.9
2070.0     1.462     28.7
2071.0     1.462     28.5
2072.0     1.461     28.2
2073.0     1.460     28.0
2074.0     1.460     27.8
2075.0     1.458     27.6
2076.0     1.457     27.3
2077.0     1.456     27.1
2078.0     1.454     26.9
2079.0     1.452     26.7
2080.0     1.450     26.4
2081.0     1.448     26.2
2082.0     1.446     26.0
2083.0     1.443     25.8
2084.0     1.441     25.5
2085.0     1.438     25.3
2086.0     1.435     25.1
2087.0     1.431     24.9
2088.0     1.428     24.6
2089.0     1.424     24.4
2090.0     1.421     24.2
2091.0     1.417     23.9
2092.0     1.413     23.7
2093.0     1.408     23.4
2094.0     1.404     23.2
2095.0     1.399     23.0
2096.0     1.394     22.7
2097.0     1.389     22.5
2098.0     1.384     22.2
2099.0     1.379     22.0
2100.0     1.373     21.7
2101.0     1.368     21.5
2102.0     1.362     21.2
2103.0     1.356     21.0
2104.0     1.350     20.7
2105.0     1.343     20.4
2106.0     1.337     20.2
2107.0     1.330     19.9
2108.0     1.323     19.6
2109.0     1.316     19.4
2110.0     1.308     19.1
2111.0     1.301     18.8
2112.0     1.293     18.5
2113.0     1.285     18.3
2114.0     1.277     18.0
2115.0     1.269     17.7
2116.0     1.261     17.4
2117.0     1.252     17.1
2118.0     1.243     16.8
2119.0     1.234     16.5
2120.0     1.225     16.1
2121.0     1.216     15.8
2122.0     1.206     15.5
2123.0     1.196     15.2
2124.0     1.186     14.8
2125.0     1.176     14.5
2126.0     1.166     14.2
2127.0     1.155     13.8
2128.0     1.145     13.5
2129.0     1.134     13.1
2130.0     1.123     12.7
2131.0     1.111     12.3
2132.0     1.100     11.9
2133.0     1.088     11.5
2134.0     1.076     11.1
2135.0     1.064     10.7
2136.0     1.052     10.3
2137.0     1.039      9.9
2138.0     1.026      9.4
2139.0     1.013      9.0
2140.0     1.000      8.5

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.