Double Star Calculator - Orbit

Orbital Elements for COU66

WDS:	COU66	WDS ID/Discoverer
P:	143.200	Orbital period (years)
a:	0.727	Semi-major axis (arcseconds)
i:	147.0	Inclination (degrees)
Ω:	12.0	Longitude of ascending node (degrees)
T:	2031.300	Epoch of periastron passage (year)
e:	0.497	Eccentricity
ω:	25.5	Longitude of periastron (degrees)
Start-Year:	1953.4	Year
End-Year:	2096.6	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for COU66
Position:	154632.45+195714.4	Epoch-2000 right ascension and declination
WDS-ID:	15465+1957	WDS designation
Discoverer Code:	COU66	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	77269	Hipparcos catalog number
V1:	10.94	Magnitude of the primary
V2:	11.20	Magnitude of the secondary
Equinox:		Equinox
Date:	2018	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:	Ksr2021	Reference

Double Star Orbit for COU66

WDS 6th Orbit including measures of COU66

-- 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 COU66

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.392    23.60
--------------------------
1953.40    1.064   175.59
1954.40    1.064   174.74
1955.40    1.064   173.89
1956.40    1.063   173.03
1957.40    1.062   172.18
1958.40    1.061   171.32
1959.40    1.059   170.46
1960.40    1.056   169.59
1961.40    1.054   168.72
1962.40    1.051   167.85
1963.40    1.047   166.97
1964.40    1.044   166.09
1965.40    1.040   165.20
1966.40    1.035   164.30
1967.40    1.030   163.39
1968.40    1.025   162.48
1969.40    1.020   161.55
1970.40    1.014   160.62
1971.40    1.008   159.67
1972.40    1.001   158.71
1973.40    0.995   157.74
1974.40    0.988   156.76
1975.40    0.980   155.76
1976.40    0.972   154.74
1977.40    0.964   153.71
1978.40    0.956   152.66
1979.40    0.947   151.59
1980.40    0.938   150.51
1981.40    0.929   149.40
1982.40    0.919   148.26
1983.40    0.909   147.11
1984.40    0.899   145.92
1985.40    0.888   144.71
1986.40    0.877   143.47
1987.40    0.866   142.20
1988.40    0.855   140.89
1989.40    0.843   139.55
1990.40    0.831   138.17
1991.40    0.819   136.75
1992.40    0.807   135.29
1993.40    0.794   133.78
1994.40    0.782   132.23
1995.40    0.769   130.62
1996.40    0.755   128.95
1997.40    0.742   127.23
1998.40    0.728   125.44
1999.40    0.715   123.58
2000.40    0.701   121.65
2001.40    0.687   119.64
2002.40    0.673   117.55
2003.40    0.659   115.37
2004.40    0.645   113.09
2005.40    0.631   110.71
2006.40    0.616   108.22
2007.40    0.602   105.62
2008.40    0.588   102.89
2009.40    0.575   100.03
2010.40    0.561    97.03
2011.40    0.548    93.88
2012.40    0.535    90.58
2013.40    0.522    87.11
2014.40    0.509    83.47
2015.40    0.497    79.65
2016.40    0.486    75.65
2017.40    0.474    71.45
2018.40    0.464    67.05
2019.40    0.453    62.45
2020.40    0.444    57.64
2021.40    0.434    52.62
2022.40    0.426    47.39
2023.40    0.417    41.94
2024.40    0.409    36.27
2025.40    0.401    30.37
2026.40    0.393    24.23
2027.40    0.385    17.83
2028.40    0.377    11.16
2029.40    0.369     4.21
2030.40    0.362   356.97
2031.40    0.355   349.43
2032.40    0.349   341.62
2033.40    0.345   333.57
2034.40    0.342   325.37
2035.40    0.342   317.10
2036.40    0.345   308.91
2037.40    0.351   300.91
2038.40    0.359   293.23
2039.40    0.371   285.96
2040.40    0.384   279.17
2041.40    0.400   272.87
2042.40    0.417   267.07
2043.40    0.436   261.76
2044.40    0.456   256.90
2045.40    0.476   252.44
2046.40    0.497   248.36
2047.40    0.519   244.61
2048.40    0.540   241.16
2049.40    0.561   237.97
2050.40    0.583   235.01
2051.40    0.604   232.26
2052.40    0.624   229.69
2053.40    0.645   227.29
2054.40    0.665   225.03
2055.40    0.684   222.91
2056.40    0.703   220.90
2057.40    0.722   218.99
2058.40    0.740   217.18
2059.40    0.757   215.45
2060.40    0.774   213.80
2061.40    0.791   212.22
2062.40    0.807   210.71
2063.40    0.822   209.25
2064.40    0.837   207.85
2065.40    0.852   206.49
2066.40    0.866   205.18
2067.40    0.879   203.91
2068.40    0.892   202.68
2069.40    0.904   201.48
2070.40    0.916   200.31
2071.40    0.928   199.18
2072.40    0.939   198.07
2073.40    0.949   196.98
2074.40    0.959   195.92
2075.40    0.968   194.88
2076.40    0.977   193.86
2077.40    0.986   192.85
2078.40    0.994   191.86
2079.40    1.001   190.89
2080.40    1.009   189.94
2081.40    1.015   188.99
2082.40    1.021   188.06
2083.40    1.027   187.14
2084.40    1.033   186.23
2085.40    1.037   185.32
2086.40    1.042   184.43
2087.40    1.046   183.54
2088.40    1.050   182.66
2089.40    1.053   181.79
2090.40    1.056   180.92
2091.40    1.058   180.05
2092.40    1.060   179.19
2093.40    1.062   178.33
2094.40    1.063   177.47
2095.40    1.064   176.62
2096.40    1.064   175.77

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 17:19:39