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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:56:23

Orbital Elements for HDS2587

WDS:	HDS2587	WDS ID/Discoverer
P:	72.865	Orbital period (years)
a:	0.13	Semi-major axis (arcseconds)
i:	55.5	Inclination (degrees)
Ω:	8.8	Longitude of ascending node (degrees)
T:	2011.774	Epoch of periastron passage (year)
e:	0.3	Eccentricity
ω:	100.2	Longitude of periastron (degrees)
Start-Year:	1989.0	Year
End-Year:	2061.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS2587

Position:	181805.51-011948.5	Epoch-2000 right ascension and declination
WDS-ID:	18181-0120	WDS designation
Discoverer Code:	HDS2587	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	168073	HD catalog number
Hipparcos number:	89680	Hipparcos catalog number
V1:	7.78	Magnitude of the primary
V2:	9.34	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2018	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HDS2587

WDS 6th Orbit including measures of HDS2587

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

Ephemeris of HDS2587

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.120    200.6
-------------------------
1989.0     0.131    344.1
1990.0     0.132    346.7
1991.0     0.133    349.3
1992.0     0.134    351.8
1993.0     0.134    354.3
1994.0     0.134    356.8
1995.0     0.133    359.3
1996.0     0.131      1.9
1997.0     0.129      4.6
1998.0     0.127      7.3
1999.0     0.123     10.2
2000.0     0.119     13.3
2001.0     0.114     16.6
2002.0     0.108     20.3
2003.0     0.102     24.4
2004.0     0.095     29.0
2005.0     0.087     34.5
2006.0     0.079     41.1
2007.0     0.071     49.2
2008.0     0.063     59.3
2009.0     0.057     71.9
2010.0     0.053     87.0
2011.0     0.052    103.7
2012.0     0.054    120.0
2013.0     0.059    134.2
2014.0     0.066    145.9
2015.0     0.073    155.3
2016.0     0.081    162.9
2017.0     0.088    169.2
2018.0     0.095    174.5
2019.0     0.101    179.2
2020.0     0.106    183.4
2021.0     0.111    187.2
2022.0     0.114    190.8
2023.0     0.117    194.2
2024.0     0.119    197.4
2025.0     0.120    200.6
2026.0     0.120    203.7
2027.0     0.120    206.9
2028.0     0.119    210.0
2029.0     0.118    213.2
2030.0     0.117    216.5
2031.0     0.115    219.8
2032.0     0.113    223.3
2033.0     0.111    226.8
2034.0     0.109    230.6
2035.0     0.107    234.4
2036.0     0.105    238.5
2037.0     0.103    242.7
2038.0     0.101    247.1
2039.0     0.099    251.6
2040.0     0.097    256.3
2041.0     0.096    261.1
2042.0     0.095    266.0
2043.0     0.095    271.0
2044.0     0.095    276.0
2045.0     0.095    281.0
2046.0     0.096    285.9
2047.0     0.097    290.7
2048.0     0.099    295.5
2049.0     0.100    300.0
2050.0     0.102    304.4
2051.0     0.105    308.7
2052.0     0.107    312.7
2053.0     0.110    316.5
2054.0     0.112    320.2
2055.0     0.115    323.7
2056.0     0.118    327.0
2057.0     0.120    330.2
2058.0     0.123    333.3
2059.0     0.125    336.2
2060.0     0.127    339.0

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.