Double Star Calculator - Orbit

Orbital Elements for I440

WDS:	I440	WDS ID/Discoverer
P:	196.000	Orbital period (years)
a:	0.274	Semi-major axis (arcseconds)
i:	157.0	Inclination (degrees)
Ω:	57.0	Longitude of ascending node (degrees)
T:	2142.000	Epoch of periastron passage (year)
e:	0.65	Eccentricity
ω:	344.0	Longitude of periastron (degrees)
Start-Year:	1927.0	Year
End-Year:	2123.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for I440
Position:	004241.37-653630.6	Epoch-2000 right ascension and declination
WDS-ID:	00427-6537	WDS designation
Discoverer Code:	I440	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	4125	HD catalog number
Hipparcos number:	3351	Hipparcos catalog number
V1:	7.27	Magnitude of the primary
V2:	8.75	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2009	Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Hrt2010a	Reference

Double Star Orbit for I440

WDS 6th Orbit including measures of I440

-- 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 I440

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.436   260.34
--------------------------
1927.00    0.203   188.54
1928.00    0.195   186.10
1929.00    0.188   183.48
1930.00    0.181   180.63
1931.00    0.173   177.55
1932.00    0.165   174.17
1933.00    0.158   170.48
1934.00    0.150   166.41
1935.00    0.143   161.91
1936.00    0.135   156.93
1937.00    0.128   151.38
1938.00    0.122   145.20
1939.00    0.115   138.33
1940.00    0.110   130.70
1941.00    0.105   122.31
1942.00    0.101   113.16
1943.00    0.098   103.36
1944.00    0.096    93.05
1945.00    0.095    82.45
1946.00    0.095    71.79
1947.00    0.097    61.29
1948.00    0.099    51.17
1949.00    0.102    41.54
1950.00    0.105    32.52
1951.00    0.109    24.14
1952.00    0.114    16.42
1953.00    0.119     9.34
1954.00    0.125     2.88
1955.00    0.131   356.98
1956.00    0.137   351.60
1957.00    0.143   346.68
1958.00    0.150   342.19
1959.00    0.156   338.07
1960.00    0.163   334.28
1961.00    0.170   330.79
1962.00    0.176   327.56
1963.00    0.183   324.57
1964.00    0.189   321.79
1965.00    0.196   319.19
1966.00    0.203   316.76
1967.00    0.209   314.48
1968.00    0.215   312.34
1969.00    0.222   310.32
1970.00    0.228   308.41
1971.00    0.234   306.60
1972.00    0.240   304.89
1973.00    0.246   303.25
1974.00    0.252   301.70
1975.00    0.258   300.21
1976.00    0.263   298.79
1977.00    0.269   297.43
1978.00    0.274   296.12
1979.00    0.280   294.87
1980.00    0.285   293.66
1981.00    0.290   292.49
1982.00    0.295   291.37
1983.00    0.300   290.28
1984.00    0.305   289.23
1985.00    0.310   288.21
1986.00    0.315   287.22
1987.00    0.320   286.26
1988.00    0.324   285.33
1989.00    0.329   284.43
1990.00    0.333   283.55
1991.00    0.337   282.69
1992.00    0.341   281.85
1993.00    0.345   281.03
1994.00    0.349   280.23
1995.00    0.353   279.45
1996.00    0.357   278.68
1997.00    0.361   277.94
1998.00    0.365   277.20
1999.00    0.368   276.48
2000.00    0.372   275.78
2001.00    0.375   275.09
2002.00    0.378   274.41
2003.00    0.382   273.74
2004.00    0.385   273.08
2005.00    0.388   272.44
2006.00    0.391   271.80
2007.00    0.394   271.17
2008.00    0.397   270.56
2009.00    0.399   269.95
2010.00    0.402   269.35
2011.00    0.405   268.76
2012.00    0.407   268.17
2013.00    0.410   267.59
2014.00    0.412   267.02
2015.00    0.414   266.46
2016.00    0.417   265.90
2017.00    0.419   265.35
2018.00    0.421   264.80
2019.00    0.423   264.26
2020.00    0.425   263.72
2021.00    0.427   263.19
2022.00    0.429   262.66
2023.00    0.430   262.14
2024.00    0.432   261.62
2025.00    0.433   261.10
2026.00    0.435   260.59
2027.00    0.436   260.08
2028.00    0.438   259.58
2029.00    0.439   259.08
2030.00    0.440   258.58
2031.00    0.441   258.08
2032.00    0.442   257.59
2033.00    0.443   257.09
2034.00    0.444   256.60
2035.00    0.445   256.12
2036.00    0.446   255.63
2037.00    0.447   255.15
2038.00    0.447   254.66
2039.00    0.448   254.18
2040.00    0.448   253.70
2041.00    0.449   253.22
2042.00    0.449   252.74
2043.00    0.449   252.26
2044.00    0.449   251.79
2045.00    0.450   251.31
2046.00    0.450   250.83
2047.00    0.450   250.35
2048.00    0.450   249.88
2049.00    0.449   249.40
2050.00    0.449   248.92
2051.00    0.449   248.44
2052.00    0.448   247.96
2053.00    0.448   247.48
2054.00    0.448   247.00
2055.00    0.447   246.52
2056.00    0.446   246.04
2057.00    0.446   245.55
2058.00    0.445   245.07
2059.00    0.444   244.58
2060.00    0.443   244.09
2061.00    0.442   243.59
2062.00    0.441   243.10
2063.00    0.440   242.60
2064.00    0.438   242.10
2065.00    0.437   241.59
2066.00    0.435   241.09
2067.00    0.434   240.58
2068.00    0.432   240.06
2069.00    0.431   239.55
2070.00    0.429   239.02
2071.00    0.427   238.50
2072.00    0.425   237.97
2073.00    0.423   237.43
2074.00    0.421   236.89
2075.00    0.419   236.34
2076.00    0.417   235.79
2077.00    0.415   235.23
2078.00    0.412   234.67
2079.00    0.410   234.10
2080.00    0.407   233.52
2081.00    0.405   232.94
2082.00    0.402   232.34
2083.00    0.399   231.74
2084.00    0.396   231.13
2085.00    0.393   230.51
2086.00    0.390   229.89
2087.00    0.387   229.25
2088.00    0.384   228.60
2089.00    0.380   227.94
2090.00    0.377   227.27
2091.00    0.374   226.58
2092.00    0.370   225.88
2093.00    0.366   225.17
2094.00    0.362   224.44
2095.00    0.358   223.70
2096.00    0.354   222.94
2097.00    0.350   222.16
2098.00    0.346   221.37
2099.00    0.342   220.55
2100.00    0.337   219.72
2101.00    0.333   218.86
2102.00    0.328   217.97
2103.00    0.323   217.06
2104.00    0.318   216.13
2105.00    0.313   215.16
2106.00    0.308   214.16
2107.00    0.303   213.13
2108.00    0.298   212.06
2109.00    0.292   210.95
2110.00    0.287   209.80
2111.00    0.281   208.61
2112.00    0.275   207.36
2113.00    0.269   206.06
2114.00    0.263   204.70
2115.00    0.257   203.27
2116.00    0.251   201.77
2117.00    0.244   200.20
2118.00    0.238   198.53
2119.00    0.231   196.77
2120.00    0.224   194.91
2121.00    0.217   192.92
2122.00    0.210   190.80

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 14:42:04