Double Star Calculator - Orbit

Orbital Elements for HDS644

WDS:	HDS644	WDS ID/Discoverer
P:	127.000	Orbital period (years)
a:	0.743	Semi-major axis (arcseconds)
i:	55.1	Inclination (degrees)
Ω:	36.9	Longitude of ascending node (degrees)
T:	1944.900	Epoch of periastron passage (year)
e:	0.3	Eccentricity
ω:	283.4	Longitude of periastron (degrees)
Start-Year:	1961.5	Year
End-Year:	2088.5	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS644
Position:	045826.15-034358.8	Epoch-2000 right ascension and declination
WDS-ID:	04584-0344	WDS designation
Discoverer Code:	HDS644	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	7.12	Magnitude of the primary
V2:	10.10	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2019	Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Tok2019d	Reference

Double Star Orbit for HDS644

WDS 6th Orbit including measures of HDS644

-- 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 HDS644

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.734   185.79
--------------------------
1961.50    0.639    38.23
1962.50    0.648    40.29
1963.50    0.656    42.30
1964.50    0.663    44.26
1965.50    0.668    46.19
1966.50    0.671    48.09
1967.50    0.674    49.98
1968.50    0.675    51.86
1969.50    0.675    53.73
1970.50    0.674    55.61
1971.50    0.672    57.49
1972.50    0.670    59.39
1973.50    0.666    61.30
1974.50    0.662    63.24
1975.50    0.657    65.20
1976.50    0.652    67.19
1977.50    0.646    69.22
1978.50    0.640    71.28
1979.50    0.634    73.39
1980.50    0.627    75.53
1981.50    0.620    77.73
1982.50    0.614    79.97
1983.50    0.607    82.27
1984.50    0.600    84.61
1985.50    0.593    87.01
1986.50    0.587    89.47
1987.50    0.580    91.97
1988.50    0.575    94.54
1989.50    0.569    97.15
1990.50    0.564    99.81
1991.50    0.559   102.52
1992.50    0.555   105.27
1993.50    0.552   108.05
1994.50    0.549   110.87
1995.50    0.547   113.72
1996.50    0.545   116.58
1997.50    0.545   119.46
1998.50    0.545   122.33
1999.50    0.545   125.21
2000.50    0.547   128.07
2001.50    0.549   130.92
2002.50    0.552   133.73
2003.50    0.556   136.52
2004.50    0.560   139.27
2005.50    0.565   141.97
2006.50    0.570   144.62
2007.50    0.576   147.22
2008.50    0.583   149.76
2009.50    0.590   152.24
2010.50    0.598   154.66
2011.50    0.605   157.02
2012.50    0.614   159.32
2013.50    0.622   161.56
2014.50    0.631   163.74
2015.50    0.640   165.86
2016.50    0.649   167.92
2017.50    0.658   169.92
2018.50    0.667   171.87
2019.50    0.676   173.76
2020.50    0.685   175.61
2021.50    0.693   177.41
2022.50    0.702   179.16
2023.50    0.710   180.88
2024.50    0.719   182.55
2025.50    0.726   184.19
2026.50    0.734   185.79
2027.50    0.741   187.36
2028.50    0.748   188.90
2029.50    0.754   190.42
2030.50    0.759   191.91
2031.50    0.764   193.38
2032.50    0.769   194.83
2033.50    0.772   196.27
2034.50    0.775   197.70
2035.50    0.777   199.12
2036.50    0.779   200.53
2037.50    0.779   201.93
2038.50    0.779   203.34
2039.50    0.778   204.75
2040.50    0.776   206.16
2041.50    0.772   207.59
2042.50    0.768   209.03
2043.50    0.763   210.49
2044.50    0.756   211.97
2045.50    0.748   213.48
2046.50    0.739   215.02
2047.50    0.729   216.61
2048.50    0.717   218.24
2049.50    0.704   219.93
2050.50    0.690   221.69
2051.50    0.674   223.53
2052.50    0.657   225.46
2053.50    0.638   227.50
2054.50    0.618   229.66
2055.50    0.597   231.98
2056.50    0.574   234.47
2057.50    0.551   237.17
2058.50    0.526   240.11
2059.50    0.500   243.36
2060.50    0.474   246.96
2061.50    0.447   250.99
2062.50    0.421   255.52
2063.50    0.395   260.66
2064.50    0.371   266.49
2065.50    0.348   273.11
2066.50    0.329   280.57
2067.50    0.314   288.86
2068.50    0.304   297.84
2069.50    0.299   307.27
2070.50    0.301   316.77
2071.50    0.309   325.98
2072.50    0.322   334.59
2073.50    0.339   342.42
2074.50    0.360   349.42
2075.50    0.383   355.61
2076.50    0.407     1.09
2077.50    0.432     5.94
2078.50    0.457    10.27
2079.50    0.481    14.15
2080.50    0.505    17.66
2081.50    0.527    20.87
2082.50    0.548    23.83
2083.50    0.567    26.58
2084.50    0.585    29.15
2085.50    0.601    31.58
2086.50    0.615    33.89
2087.50    0.628    36.10

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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 15:32:15