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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:27:17

Orbital Elements for I27CD

WDS:	I27CD	WDS ID/Discoverer
P:	84.778	Orbital period (years)
a:	1.09664	Semi-major axis (arcseconds)
i:	32.561	Inclination (degrees)
Ω:	138.062	Longitude of ascending node (degrees)
T:	1920.469	Epoch of periastron passage (year)
e:	0.04027	Eccentricity
ω:	153.001	Longitude of periastron (degrees)
Start-Year:	1983.0	Year
End-Year:	2067.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for I27CD

Position:	011500.78-684908.1	Epoch-2000 right ascension and declination
WDS-ID:	01158-6853	WDS designation
Discoverer Code:	I27CD	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	7693	HD catalog number
Hipparcos number:	5842	Hipparcos catalog number
V1:	7.84	Magnitude of the primary
V2:	8.44	Magnitude of the secondary
Equinox:		Equinox
Date:	2015	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for I27CD

WDS 6th Orbit including measures of I27CD

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

Ephemeris of I27CD

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.964     15.3
-------------------------
1983.0     0.992    187.3
1984.0     0.977    191.7
1985.0     0.963    196.3
1986.0     0.949    201.0
1987.0     0.937    205.8
1988.0     0.927    210.8
1989.0     0.918    215.8
1990.0     0.912    220.9
1991.0     0.907    226.1
1992.0     0.905    231.4
1993.0     0.905    236.6
1994.0     0.908    241.9
1995.0     0.912    247.1
1996.0     0.919    252.2
1997.0     0.927    257.3
1998.0     0.936    262.2
1999.0     0.947    267.1
2000.0     0.959    271.8
2001.0     0.971    276.4
2002.0     0.983    280.9
2003.0     0.995    285.3
2004.0     1.007    289.6
2005.0     1.018    293.8
2006.0     1.028    297.9
2007.0     1.037    301.9
2008.0     1.044    305.9
2009.0     1.050    309.8
2010.0     1.054    313.7
2011.0     1.057    317.6
2012.0     1.058    321.4
2013.0     1.057    325.3
2014.0     1.054    329.1
2015.0     1.050    333.0
2016.0     1.045    336.9
2017.0     1.038    340.9
2018.0     1.030    344.9
2019.0     1.021    349.0
2020.0     1.012    353.2
2021.0     1.002    357.4
2022.0     0.992      1.7
2023.0     0.982      6.2
2024.0     0.972     10.7
2025.0     0.964     15.3
2026.0     0.956     19.9
2027.0     0.949     24.7
2028.0     0.944     29.5
2029.0     0.940     34.3
2030.0     0.939     39.2
2031.0     0.939     44.1
2032.0     0.940     48.9
2033.0     0.944     53.8
2034.0     0.950     58.6
2035.0     0.957     63.3
2036.0     0.966     68.0
2037.0     0.976     72.5
2038.0     0.987     77.0
2039.0     0.999     81.4
2040.0     1.012     85.6
2041.0     1.025     89.8
2042.0     1.039     93.8
2043.0     1.052     97.7
2044.0     1.065    101.6
2045.0     1.078    105.3
2046.0     1.089    109.0
2047.0     1.100    112.6
2048.0     1.110    116.1
2049.0     1.118    119.6
2050.0     1.125    123.0
2051.0     1.130    126.4
2052.0     1.134    129.7
2053.0     1.136    133.1
2054.0     1.136    136.4
2055.0     1.135    139.7
2056.0     1.131    143.1
2057.0     1.126    146.4
2058.0     1.120    149.9
2059.0     1.111    153.3
2060.0     1.102    156.8
2061.0     1.090    160.4
2062.0     1.078    164.1
2063.0     1.064    167.8
2064.0     1.050    171.7
2065.0     1.035    175.6
2066.0     1.020    179.7

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.