Double Star Calculator - Orbit

Orbital Elements for HDS398

WDS:	HDS398	WDS ID/Discoverer
P:	170.000	Orbital period (years)
a:	0.235	Semi-major axis (arcseconds)
i:	109.7	Inclination (degrees)
Ω:	243.1	Longitude of ascending node (degrees)
T:	2003.370	Epoch of periastron passage (year)
e:	0.462	Eccentricity
ω:	39.8	Longitude of periastron (degrees)
Start-Year:	1940.0	Year
End-Year:	2110.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS398
Position:	030839.51-441317.8	Epoch-2000 right ascension and declination
WDS-ID:	03087-4413	WDS designation
Discoverer Code:	HDS398	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	19693	HD catalog number
Hipparcos number:	14608	Hipparcos catalog number
V1:	9.44	Magnitude of the primary
V2:	9.70	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2018	Date of last observation
Orbit grade:	5	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:		Flags
Ephemerides:		Ephemerides
Code:	Tok2020g	Reference

Double Star Orbit for HDS398

WDS 6th Orbit including measures of HDS398

-- 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 HDS398

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.169    77.54
--------------------------
1940.00    0.192    33.38
1941.00    0.187    32.41
1942.00    0.182    31.38
1943.00    0.178    30.31
1944.00    0.173    29.17
1945.00    0.168    27.97
1946.00    0.164    26.70
1947.00    0.159    25.36
1948.00    0.154    23.93
1949.00    0.150    22.41
1950.00    0.145    20.80
1951.00    0.140    19.08
1952.00    0.136    17.24
1953.00    0.131    15.27
1954.00    0.127    13.16
1955.00    0.122    10.91
1956.00    0.118     8.48
1957.00    0.114     5.88
1958.00    0.110     3.09
1959.00    0.106     0.10
1960.00    0.103   356.90
1961.00    0.100   353.48
1962.00    0.097   349.84
1963.00    0.094   345.99
1964.00    0.092   341.94
1965.00    0.090   337.70
1966.00    0.089   333.31
1967.00    0.088   328.79
1968.00    0.087   324.20
1969.00    0.087   319.58
1970.00    0.087   314.99
1971.00    0.088   310.46
1972.00    0.090   306.04
1973.00    0.091   301.78
1974.00    0.094   297.68
1975.00    0.096   293.78
1976.00    0.099   290.08
1977.00    0.102   286.59
1978.00    0.105   283.30
1979.00    0.108   280.20
1980.00    0.111   277.29
1981.00    0.115   274.55
1982.00    0.118   271.96
1983.00    0.121   269.52
1984.00    0.125   267.21
1985.00    0.128   265.02
1986.00    0.131   262.93
1987.00    0.133   260.93
1988.00    0.136   259.00
1989.00    0.138   257.13
1990.00    0.140   255.32
1991.00    0.141   253.55
1992.00    0.142   251.80
1993.00    0.142   250.07
1994.00    0.142   248.33
1995.00    0.141   246.57
1996.00    0.139   244.78
1997.00    0.136   242.93
1998.00    0.133   241.00
1999.00    0.129   238.95
2000.00    0.124   236.75
2001.00    0.118   234.35
2002.00    0.111   231.68
2003.00    0.104   228.65
2004.00    0.096   225.14
2005.00    0.088   220.97
2006.00    0.079   215.93
2007.00    0.071   209.67
2008.00    0.063   201.78
2009.00    0.056   191.78
2010.00    0.051   179.39
2011.00    0.048   164.94
2012.00    0.048   149.77
2013.00    0.052   135.67
2014.00    0.057   123.80
2015.00    0.065   114.33
2016.00    0.073   106.92
2017.00    0.082   101.10
2018.00    0.092    96.45
2019.00    0.101    92.67
2020.00    0.111    89.55
2021.00    0.120    86.93
2022.00    0.130    84.68
2023.00    0.139    82.74
2024.00    0.148    81.03
2025.00    0.156    79.52
2026.00    0.165    78.17
2027.00    0.173    76.94
2028.00    0.181    75.83
2029.00    0.189    74.80
2030.00    0.196    73.86
2031.00    0.203    72.98
2032.00    0.210    72.16
2033.00    0.217    71.39
2034.00    0.223    70.67
2035.00    0.229    69.98
2036.00    0.235    69.33
2037.00    0.240    68.71
2038.00    0.246    68.12
2039.00    0.251    67.55
2040.00    0.255    67.01
2041.00    0.260    66.48
2042.00    0.264    65.97
2043.00    0.268    65.48
2044.00    0.272    65.00
2045.00    0.276    64.54
2046.00    0.280    64.08
2047.00    0.283    63.64
2048.00    0.286    63.21
2049.00    0.289    62.79
2050.00    0.291    62.37
2051.00    0.294    61.96
2052.00    0.296    61.56
2053.00    0.298    61.16
2054.00    0.300    60.77
2055.00    0.302    60.39
2056.00    0.303    60.00
2057.00    0.305    59.63
2058.00    0.306    59.25
2059.00    0.307    58.88
2060.00    0.308    58.51
2061.00    0.308    58.14
2062.00    0.309    57.77
2063.00    0.309    57.41
2064.00    0.310    57.04
2065.00    0.310    56.68
2066.00    0.310    56.31
2067.00    0.309    55.95
2068.00    0.309    55.58
2069.00    0.309    55.22
2070.00    0.308    54.85
2071.00    0.307    54.48
2072.00    0.306    54.11
2073.00    0.305    53.73
2074.00    0.304    53.36
2075.00    0.303    52.98
2076.00    0.301    52.59
2077.00    0.300    52.21
2078.00    0.298    51.82
2079.00    0.296    51.42
2080.00    0.295    51.02
2081.00    0.292    50.61
2082.00    0.290    50.20
2083.00    0.288    49.78
2084.00    0.286    49.36
2085.00    0.283    48.93
2086.00    0.281    48.49
2087.00    0.278    48.04
2088.00    0.275    47.58
2089.00    0.272    47.12
2090.00    0.269    46.64
2091.00    0.266    46.15
2092.00    0.263    45.65
2093.00    0.260    45.14
2094.00    0.256    44.62
2095.00    0.253    44.08
2096.00    0.249    43.52
2097.00    0.246    42.95
2098.00    0.242    42.37
2099.00    0.238    41.76
2100.00    0.234    41.13
2101.00    0.230    40.49
2102.00    0.226    39.81
2103.00    0.222    39.12
2104.00    0.218    38.40
2105.00    0.214    37.65
2106.00    0.209    36.87
2107.00    0.205    36.05
2108.00    0.201    35.20
2109.00    0.196    34.31

Disclaimer

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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 15:08:02