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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:30:10

Orbital Elements for COU432BC

WDS:	COU432BC	WDS ID/Discoverer
P:	69.940	Orbital period (years)
a:	0.192	Semi-major axis (arcseconds)
i:	108.2	Inclination (degrees)
Ω:	191.2	Longitude of ascending node (degrees)
T:	1985.200	Epoch of periastron passage (year)
e:	0.063	Eccentricity
ω:	71.3	Longitude of periastron (degrees)
Start-Year:	1991.0	Year
End-Year:	2059.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for COU432BC

Position:	215417.44+194305.3	Epoch-2000 right ascension and declination
WDS-ID:	21543+1943	WDS designation
Discoverer Code:	COU432BC	Discover designation and components
ADS number:	15431	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	108121	Hipparcos catalog number
V1:	8.8	Magnitude of the primary
V2:	9.0	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2017	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for COU432BC

WDS 6th Orbit including measures of COU432BC

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

Ephemeris of COU432BC

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.064    270.6
-------------------------
1991.0     0.072     60.6
1992.0     0.084     50.7
1993.0     0.096     43.4
1994.0     0.109     37.7
1995.0     0.122     33.3
1996.0     0.134     29.7
1997.0     0.145     26.6
1998.0     0.156     24.0
1999.0     0.165     21.7
2000.0     0.173     19.6
2001.0     0.180     17.7
2002.0     0.186     16.0
2003.0     0.191     14.3
2004.0     0.194     12.7
2005.0     0.195     11.2
2006.0     0.196      9.6
2007.0     0.195      8.1
2008.0     0.192      6.5
2009.0     0.189      4.8
2010.0     0.184      3.1
2011.0     0.178      1.3
2012.0     0.171    359.4
2013.0     0.163    357.3
2014.0     0.154    354.9
2015.0     0.144    352.3
2016.0     0.134    349.2
2017.0     0.123    345.6
2018.0     0.112    341.4
2019.0     0.101    336.2
2020.0     0.091    329.7
2021.0     0.081    321.7
2022.0     0.073    311.6
2023.0     0.067    299.3
2024.0     0.064    285.2
2025.0     0.064    270.6
2026.0     0.069    257.2
2027.0     0.076    245.7
2028.0     0.085    236.5
2029.0     0.095    229.1
2030.0     0.106    223.2
2031.0     0.117    218.4
2032.0     0.127    214.4
2033.0     0.138    211.0
2034.0     0.147    208.1
2035.0     0.156    205.5
2036.0     0.164    203.2
2037.0     0.171    201.1
2038.0     0.177    199.2
2039.0     0.182    197.3
2040.0     0.185    195.6
2041.0     0.187    193.9
2042.0     0.188    192.2
2043.0     0.187    190.5
2044.0     0.185    188.8
2045.0     0.181    187.0
2046.0     0.175    185.2
2047.0     0.169    183.2
2048.0     0.161    181.0
2049.0     0.152    178.6
2050.0     0.141    175.8
2051.0     0.130    172.6
2052.0     0.118    168.7
2053.0     0.105    163.9
2054.0     0.092    157.8
2055.0     0.080    149.8
2056.0     0.069    139.1
2057.0     0.061    124.9
2058.0     0.057    107.6

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.