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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:29:06

Orbital Elements for HDS198

WDS:	HDS198	WDS ID/Discoverer
P:	51.600	Orbital period (years)
a:	0.176	Semi-major axis (arcseconds)
i:	107.3	Inclination (degrees)
Ω:	18.5	Longitude of ascending node (degrees)
T:	2028.800	Epoch of periastron passage (year)
e:	0.7	Eccentricity
ω:	42.4	Longitude of periastron (degrees)
Start-Year:	2000.0	Year
End-Year:	2050.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS198

Position:	013110.70-070158.0	Epoch-2000 right ascension and declination
WDS-ID:	01312-0702	WDS designation
Discoverer Code:	HDS198	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	9278	HD catalog number
Hipparcos number:	7075	Hipparcos catalog number
V1:	8.19	Magnitude of the primary
V2:	9.79	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2018	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS198

WDS 6th Orbit including measures of HDS198

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

Ephemeris of HDS198

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.055     54.3
-------------------------
2000.0     0.242    185.8
2001.0     0.238    185.0
2002.0     0.234    184.2
2003.0     0.229    183.3
2004.0     0.223    182.4
2005.0     0.217    181.5
2006.0     0.210    180.5
2007.0     0.203    179.4
2008.0     0.195    178.2
2009.0     0.186    177.0
2010.0     0.177    175.6
2011.0     0.167    174.0
2012.0     0.157    172.3
2013.0     0.147    170.3
2014.0     0.136    168.0
2015.0     0.124    165.3
2016.0     0.113    162.0
2017.0     0.101    157.9
2018.0     0.089    152.8
2019.0     0.077    146.2
2020.0     0.067    137.3
2021.0     0.057    125.2
2022.0     0.051    109.2
2023.0     0.048     90.2
2024.0     0.050     70.9
2025.0     0.055     54.3
2026.0     0.062     40.9
2027.0     0.065     29.7
2028.0     0.059     18.1
2029.0     0.034    356.7
2030.0     0.022    258.5
2031.0     0.056    219.5
2032.0     0.089    210.3
2033.0     0.116    205.9
2034.0     0.140    203.0
2035.0     0.160    201.0
2036.0     0.177    199.4
2037.0     0.191    198.0
2038.0     0.203    196.8
2039.0     0.214    195.8
2040.0     0.223    194.8
2041.0     0.230    193.9
2042.0     0.236    193.1
2043.0     0.241    192.3
2044.0     0.244    191.5
2045.0     0.247    190.7
2046.0     0.249    190.0
2047.0     0.249    189.2
2048.0     0.249    188.5
2049.0     0.248    187.8

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.