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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:31:56

Orbital Elements for HDS2185

WDS:	HDS2185	WDS ID/Discoverer
P:	72.320	Orbital period (years)
a:	0.5757	Semi-major axis (arcseconds)
i:	34.6	Inclination (degrees)
Ω:	150.6	Longitude of ascending node (degrees)
T:	2010.260	Epoch of periastron passage (year)
e:	0.414	Eccentricity
ω:	310.3	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 HDS2185

Position:	153356.80-170008.2	Epoch-2000 right ascension and declination
WDS-ID:	15339-1700	WDS designation
Discoverer Code:	HDS2185	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	138648	HD catalog number
Hipparcos number:	76203	Hipparcos catalog number
V1:	8.55	Magnitude of the primary
V2:	9.78	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HDS2185

WDS 6th Orbit including measures of HDS2185

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

Ephemeris of HDS2185

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.510    217.8
-------------------------
1989.0     0.707    320.0
1990.0     0.696    322.5
1991.0     0.682    325.1
1992.0     0.668    327.8
1993.0     0.651    330.7
1994.0     0.633    333.7
1995.0     0.613    336.9
1996.0     0.591    340.3
1997.0     0.567    344.0
1998.0     0.542    348.0
1999.0     0.515    352.4
2000.0     0.487    357.3
2001.0     0.457      2.9
2002.0     0.426      9.2
2003.0     0.396     16.6
2004.0     0.366     25.1
2005.0     0.339     35.1
2006.0     0.316     46.7
2007.0     0.299     59.9
2008.0     0.291     74.2
2009.0     0.292     88.8
2010.0     0.301    102.9
2011.0     0.315    116.0
2012.0     0.333    127.8
2013.0     0.352    138.3
2014.0     0.371    147.8
2015.0     0.388    156.4
2016.0     0.403    164.3
2017.0     0.417    171.6
2018.0     0.430    178.5
2019.0     0.443    185.0
2020.0     0.454    191.1
2021.0     0.465    197.0
2022.0     0.476    202.5
2023.0     0.488    207.8
2024.0     0.499    212.9
2025.0     0.510    217.8
2026.0     0.522    222.4
2027.0     0.533    226.9
2028.0     0.545    231.1
2029.0     0.557    235.2
2030.0     0.569    239.1
2031.0     0.581    242.8
2032.0     0.593    246.4
2033.0     0.605    249.9
2034.0     0.617    253.2
2035.0     0.629    256.4
2036.0     0.640    259.4
2037.0     0.652    262.4
2038.0     0.663    265.3
2039.0     0.673    268.0
2040.0     0.683    270.7
2041.0     0.693    273.3
2042.0     0.702    275.9
2043.0     0.710    278.4
2044.0     0.718    280.8
2045.0     0.725    283.2
2046.0     0.731    285.5
2047.0     0.737    287.8
2048.0     0.742    290.0
2049.0     0.746    292.3
2050.0     0.749    294.5
2051.0     0.751    296.7
2052.0     0.752    298.9
2053.0     0.752    301.1
2054.0     0.751    303.2
2055.0     0.749    305.4
2056.0     0.746    307.7
2057.0     0.742    309.9
2058.0     0.736    312.2
2059.0     0.729    314.5
2060.0     0.721    316.8

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.