Content-Type: text/html; charset=UTF-8 Double Star Calculator - Orbital Elements

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:39:57

Orbital Elements for COU985

WDS:	COU985	WDS ID/Discoverer
P:	81.970	Orbital period (years)
a:	0.282	Semi-major axis (arcseconds)
i:	59.1	Inclination (degrees)
Ω:	78.9	Longitude of ascending node (degrees)
T:	1986.180	Epoch of periastron passage (year)
e:	0.27	Eccentricity
ω:	34.5	Longitude of periastron (degrees)
Start-Year:	1985.0	Year
End-Year:	2065.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for COU985

Position:	163824.13+351334.5	Epoch-2000 right ascension and declination
WDS-ID:	16384+3514	WDS designation
Discoverer Code:	COU985	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	81470	Hipparcos catalog number
V1:	9.4	Magnitude of the primary
V2:	9.7	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2012	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for COU985

WDS 6th Orbit including measures of COU985

Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements)

Ephemeris of COU985

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.325    274.7
-------------------------
1985.0     0.192     92.5
1986.0     0.182     97.4
1987.0     0.170    103.0
1988.0     0.158    109.4
1989.0     0.146    116.9
1990.0     0.134    125.7
1991.0     0.125    136.0
1992.0     0.118    147.7
1993.0     0.116    160.4
1994.0     0.118    173.2
1995.0     0.124    185.1
1996.0     0.133    195.7
1997.0     0.145    204.6
1998.0     0.159    212.1
1999.0     0.174    218.3
2000.0     0.189    223.5
2001.0     0.204    228.0
2002.0     0.219    231.9
2003.0     0.233    235.2
2004.0     0.247    238.2
2005.0     0.260    240.9
2006.0     0.272    243.4
2007.0     0.283    245.6
2008.0     0.293    247.7
2009.0     0.303    249.6
2010.0     0.311    251.5
2011.0     0.318    253.2
2012.0     0.324    254.9
2013.0     0.330    256.5
2014.0     0.334    258.1
2015.0     0.338    259.6
2016.0     0.340    261.1
2017.0     0.342    262.6
2018.0     0.343    264.0
2019.0     0.343    265.5
2020.0     0.342    267.0
2021.0     0.340    268.5
2022.0     0.337    270.0
2023.0     0.334    271.5
2024.0     0.330    273.1
2025.0     0.325    274.7
2026.0     0.320    276.3
2027.0     0.314    278.1
2028.0     0.307    279.8
2029.0     0.300    281.7
2030.0     0.292    283.7
2031.0     0.284    285.8
2032.0     0.276    288.0
2033.0     0.267    290.3
2034.0     0.257    292.8
2035.0     0.248    295.5
2036.0     0.238    298.5
2037.0     0.228    301.7
2038.0     0.218    305.1
2039.0     0.209    308.9
2040.0     0.199    313.1
2041.0     0.190    317.6
2042.0     0.182    322.6
2043.0     0.175    328.1
2044.0     0.168    333.9
2045.0     0.163    340.2
2046.0     0.159    346.9
2047.0     0.157    353.8
2048.0     0.156      0.8
2049.0     0.157      7.9
2050.0     0.160     14.7
2051.0     0.164     21.3
2052.0     0.169     27.6
2053.0     0.174     33.5
2054.0     0.181     39.0
2055.0     0.187     44.0
2056.0     0.194     48.8
2057.0     0.200     53.2
2058.0     0.206     57.4
2059.0     0.211     61.4
2060.0     0.214     65.2
2061.0     0.216     69.0
2062.0     0.217     72.6
2063.0     0.216     76.3
2064.0     0.213     80.1

Disclaimer

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.