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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:32:05

Orbital Elements for HDS998

WDS:	HDS998	WDS ID/Discoverer
P:	61.600	Orbital period (years)
a:	0.117	Semi-major axis (arcseconds)
i:	40.5	Inclination (degrees)
Ω:	34.7	Longitude of ascending node (degrees)
T:	2021.500	Epoch of periastron passage (year)
e:	0.095	Eccentricity
ω:	53.6	Longitude of periastron (degrees)
Start-Year:	1995.0	Year
End-Year:	2055.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS998

Position:	071136.72-795908.5	Epoch-2000 right ascension and declination
WDS-ID:	07116-7959	WDS designation
Discoverer Code:	HDS998	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	9.08	Magnitude of the primary
V2:	11.61	Magnitude of the secondary
Equinox:		Equinox
Date:	2018	Date of last observation
Orbit grade:	5	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS998

WDS 6th Orbit including measures of HDS998

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

Ephemeris of HDS998

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.082    109.5
-------------------------
1995.0     0.099    284.7
1996.0     0.098    291.0
1997.0     0.096    297.4
1998.0     0.096    304.0
1999.0     0.095    310.7
2000.0     0.095    317.4
2001.0     0.096    324.0
2002.0     0.097    330.5
2003.0     0.098    336.9
2004.0     0.100    343.0
2005.0     0.102    349.0
2006.0     0.104    354.7
2007.0     0.105      0.3
2008.0     0.107      5.6
2009.0     0.108     10.8
2010.0     0.110     15.9
2011.0     0.110     20.9
2012.0     0.111     25.9
2013.0     0.110     30.9
2014.0     0.110     35.9
2015.0     0.108     41.0
2016.0     0.106     46.2
2017.0     0.104     51.7
2018.0     0.101     57.4
2019.0     0.098     63.5
2020.0     0.095     70.0
2021.0     0.092     76.9
2022.0     0.089     84.4
2023.0     0.086     92.3
2024.0     0.084    100.7
2025.0     0.082    109.5
2026.0     0.082    118.5
2027.0     0.082    127.5
2028.0     0.083    136.4
2029.0     0.085    144.9
2030.0     0.088    153.0
2031.0     0.092    160.4
2032.0     0.095    167.4
2033.0     0.099    173.8
2034.0     0.103    179.7
2035.0     0.107    185.2
2036.0     0.110    190.3
2037.0     0.114    195.2
2038.0     0.116    199.7
2039.0     0.119    204.1
2040.0     0.121    208.3
2041.0     0.122    212.4
2042.0     0.123    216.4
2043.0     0.124    220.4
2044.0     0.124    224.4
2045.0     0.123    228.3
2046.0     0.122    232.4
2047.0     0.121    236.5
2048.0     0.119    240.7
2049.0     0.117    245.0
2050.0     0.115    249.5
2051.0     0.113    254.2
2052.0     0.110    259.1
2053.0     0.107    264.2
2054.0     0.105    269.6

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.