Double Star Calculator - Orbit

Orbital Elements for COU490

WDS:	COU490	WDS ID/Discoverer
P:	100.100	Orbital period (years)
a:	0.218	Semi-major axis (arcseconds)
i:	130.1	Inclination (degrees)
Ω:	1.7	Longitude of ascending node (degrees)
T:	2007.340	Epoch of periastron passage (year)
e:	0.151	Eccentricity
ω:	68.8	Longitude of periastron (degrees)
Start-Year:	1974.95	Year
End-Year:	2075.05	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for COU490
Position:	164458.51+292737.9	Epoch-2000 right ascension and declination
WDS-ID:	16450+2928	WDS designation
Discoverer Code:	COU490	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	151236	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	8.8	Magnitude of the primary
V2:	8.8	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2005	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:	Doc2008a	Reference

Double Star Orbit for COU490

WDS 6th Orbit including measures of COU490

-- 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 COU490

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.199   198.59
--------------------------
1974.95    0.174    51.96
1975.95    0.177    48.44
1976.95    0.181    45.04
1977.95    0.184    41.76
1978.95    0.187    38.59
1979.95    0.190    35.52
1980.95    0.193    32.55
1981.95    0.195    29.66
1982.95    0.198    26.84
1983.95    0.200    24.09
1984.95    0.202    21.40
1985.95    0.203    18.75
1986.95    0.205    16.14
1987.95    0.205    13.55
1988.95    0.205    10.97
1989.95    0.205     8.39
1990.95    0.204     5.79
1991.95    0.203     3.17
1992.95    0.201     0.51
1993.95    0.199   357.78
1994.95    0.196   354.98
1995.95    0.192   352.08
1996.95    0.188   349.06
1997.95    0.183   345.90
1998.95    0.178   342.57
1999.95    0.173   339.03
2000.95    0.167   335.25
2001.95    0.161   331.19
2002.95    0.155   326.80
2003.95    0.148   322.05
2004.95    0.142   316.90
2005.95    0.137   311.30
2006.95    0.132   305.24
2007.95    0.127   298.73
2008.95    0.124   291.80
2009.95    0.121   284.54
2010.95    0.120   277.08
2011.95    0.120   269.55
2012.95    0.122   262.13
2013.95    0.125   254.97
2014.95    0.129   248.17
2015.95    0.133   241.82
2016.95    0.139   235.94
2017.95    0.145   230.53
2018.95    0.151   225.56
2019.95    0.158   221.02
2020.95    0.165   216.84
2021.95    0.172   212.99
2022.95    0.178   209.43
2023.95    0.184   206.12
2024.95    0.191   203.03
2025.95    0.196   200.12
2026.95    0.202   197.37
2027.95    0.207   194.75
2028.95    0.211   192.26
2029.95    0.215   189.86
2030.95    0.218   187.54
2031.95    0.221   185.29
2032.95    0.224   183.10
2033.95    0.226   180.95
2034.95    0.228   178.83
2035.95    0.229   176.74
2036.95    0.229   174.67
2037.95    0.229   172.60
2038.95    0.229   170.52
2039.95    0.228   168.44
2040.95    0.227   166.35
2041.95    0.226   164.22
2042.95    0.224   162.07
2043.95    0.222   159.88
2044.95    0.219   157.64
2045.95    0.216   155.34
2046.95    0.213   152.98
2047.95    0.210   150.56
2048.95    0.207   148.05
2049.95    0.203   145.46
2050.95    0.199   142.78
2051.95    0.196   139.99
2052.95    0.192   137.09
2053.95    0.188   134.08
2054.95    0.184   130.95
2055.95    0.181   127.68
2056.95    0.177   124.29
2057.95    0.174   120.76
2058.95    0.171   117.11
2059.95    0.168   113.32
2060.95    0.166   109.42
2061.95    0.164   105.41
2062.95    0.162   101.30
2063.95    0.161    97.12
2064.95    0.160    92.88
2065.95    0.159    88.61
2066.95    0.160    84.33
2067.95    0.160    80.07
2068.95    0.161    75.84
2069.95    0.162    71.68
2070.95    0.164    67.60
2071.95    0.166    63.61
2072.95    0.169    59.73
2073.95    0.171    55.96
2074.95    0.174    52.31

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 17:30:34