Double Star Calculator - Orbit

Orbital Elements for DON43

WDS:	DON43	WDS ID/Discoverer
P:	121.500	Orbital period (years)
a:	0.201	Semi-major axis (arcseconds)
i:	39.2	Inclination (degrees)
Ω:	51.7	Longitude of ascending node (degrees)
T:	1984.700	Epoch of periastron passage (year)
e:	0.415	Eccentricity
ω:	97.1	Longitude of periastron (degrees)
Start-Year:	1964.25	Year
End-Year:	2085.75	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for DON43
Position:	025121.23-213840.9	Epoch-2000 right ascension and declination
WDS-ID:	02514-2139	WDS designation
Discoverer Code:	DON43	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	17884	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	9.8	Magnitude of the primary
V2:	10.0	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2022	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:	Tok2023a	Reference

Double Star Orbit for DON43

WDS 6th Orbit including measures of DON43

-- 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 DON43

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.212   296.90
--------------------------
1964.25    0.191    42.29
1965.25    0.187    44.65
1966.25    0.183    47.11
1967.25    0.179    49.68
1968.25    0.174    52.39
1969.25    0.169    55.25
1970.25    0.164    58.29
1971.25    0.158    61.54
1972.25    0.153    65.03
1973.25    0.147    68.80
1974.25    0.140    72.91
1975.25    0.134    77.42
1976.25    0.127    82.39
1977.25    0.120    87.91
1978.25    0.114    94.08
1979.25    0.108   100.96
1980.25    0.102   108.64
1981.25    0.097   117.13
1982.25    0.094   126.37
1983.25    0.092   136.19
1984.25    0.091   146.29
1985.25    0.092   156.32
1986.25    0.095   165.97
1987.25    0.099   174.97
1988.25    0.104   183.21
1989.25    0.109   190.66
1990.25    0.115   197.36
1991.25    0.121   203.38
1992.25    0.128   208.82
1993.25    0.134   213.76
1994.25    0.140   218.27
1995.25    0.145   222.43
1996.25    0.151   226.28
1997.25    0.156   229.88
1998.25    0.160   233.26
1999.25    0.165   236.45
2000.25    0.169   239.48
2001.25    0.173   242.37
2002.25    0.176   245.14
2003.25    0.179   247.81
2004.25    0.182   250.39
2005.25    0.185   252.88
2006.25    0.188   255.31
2007.25    0.190   257.67
2008.25    0.192   259.98
2009.25    0.194   262.24
2010.25    0.196   264.46
2011.25    0.198   266.64
2012.25    0.199   268.78
2013.25    0.201   270.89
2014.25    0.202   272.97
2015.25    0.203   275.02
2016.25    0.204   277.06
2017.25    0.205   279.07
2018.25    0.206   281.06
2019.25    0.207   283.03
2020.25    0.208   284.99
2021.25    0.209   286.93
2022.25    0.210   288.85
2023.25    0.210   290.77
2024.25    0.211   292.67
2025.25    0.212   294.56
2026.25    0.212   296.44
2027.25    0.213   298.31
2028.25    0.213   300.16
2029.25    0.214   302.01
2030.25    0.214   303.85
2031.25    0.215   305.68
2032.25    0.215   307.51
2033.25    0.216   309.32
2034.25    0.216   311.12
2035.25    0.217   312.92
2036.25    0.217   314.71
2037.25    0.218   316.49
2038.25    0.218   318.27
2039.25    0.219   320.04
2040.25    0.219   321.80
2041.25    0.220   323.55
2042.25    0.220   325.29
2043.25    0.221   327.03
2044.25    0.221   328.76
2045.25    0.221   330.49
2046.25    0.222   332.20
2047.25    0.222   333.92
2048.25    0.223   335.62
2049.25    0.223   337.32
2050.25    0.223   339.02
2051.25    0.224   340.70
2052.25    0.224   342.39
2053.25    0.224   344.07
2054.25    0.225   345.74
2055.25    0.225   347.41
2056.25    0.225   349.08
2057.25    0.225   350.74
2058.25    0.225   352.41
2059.25    0.225   354.07
2060.25    0.225   355.73
2061.25    0.225   357.39
2062.25    0.225   359.05
2063.25    0.225     0.71
2064.25    0.225     2.38
2065.25    0.225     4.04
2066.25    0.224     5.72
2067.25    0.224     7.40
2068.25    0.223     9.08
2069.25    0.223    10.78
2070.25    0.222    12.49
2071.25    0.221    14.21
2072.25    0.220    15.94
2073.25    0.219    17.69
2074.25    0.218    19.46
2075.25    0.217    21.24
2076.25    0.215    23.06
2077.25    0.213    24.90
2078.25    0.211    26.77
2079.25    0.209    28.68
2080.25    0.207    30.62
2081.25    0.205    32.61
2082.25    0.202    34.65
2083.25    0.199    36.75
2084.25    0.196    38.91
2085.25    0.193    41.14

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 15:05:06