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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:45:45

Orbital Elements for HDS399

WDS:	HDS399	WDS ID/Discoverer
P:	35.370	Orbital period (years)
a:	0.147	Semi-major axis (arcseconds)
i:	63.9	Inclination (degrees)
Ω:	237.4	Longitude of ascending node (degrees)
T:	2015.440	Epoch of periastron passage (year)
e:	0.15	Eccentricity
ω:	223.2	Longitude of periastron (degrees)
Start-Year:	2008.0	Year
End-Year:	2042.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS399

Position:	030840.22-480059.1	Epoch-2000 right ascension and declination
WDS-ID:	03087-4801	WDS designation
Discoverer Code:	HDS399	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	8.57	Magnitude of the primary
V2:	9.95	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2019	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS399

WDS 6th Orbit including measures of HDS399

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

Ephemeris of HDS399

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.143    226.8
-------------------------
2008.0     0.105     30.0
2009.0     0.116     37.8
2010.0     0.124     44.3
2011.0     0.129     50.3
2012.0     0.130     55.9
2013.0     0.126     61.7
2014.0     0.118     68.1
2015.0     0.105     75.8
2016.0     0.090     85.9
2017.0     0.074    100.5
2018.0     0.061    122.2
2019.0     0.058    150.4
2020.0     0.065    176.5
2021.0     0.081    194.8
2022.0     0.098    206.9
2023.0     0.115    215.4
2024.0     0.131    221.7
2025.0     0.143    226.8
2026.0     0.153    231.1
2027.0     0.159    235.1
2028.0     0.162    238.8
2029.0     0.162    242.4
2030.0     0.159    246.1
2031.0     0.153    250.0
2032.0     0.145    254.3
2033.0     0.135    259.2
2034.0     0.123    265.0
2035.0     0.110    272.0
2036.0     0.097    281.1
2037.0     0.084    292.9
2038.0     0.075    308.1
2039.0     0.071    326.4
2040.0     0.072    345.5
2041.0     0.079      2.5

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.