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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:45:28

Orbital Elements for HDS391

WDS:	HDS391	WDS ID/Discoverer
P:	41.654	Orbital period (years)
a:	0.21	Semi-major axis (arcseconds)
i:	74.7	Inclination (degrees)
Ω:	296.8	Longitude of ascending node (degrees)
T:	2025.319	Epoch of periastron passage (year)
e:	0.75	Eccentricity
ω:	229.2	Longitude of periastron (degrees)
Start-Year:	2005.0	Year
End-Year:	2045.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS391

Position:	030518.24-405903.2	Epoch-2000 right ascension and declination
WDS-ID:	03053-4059	WDS designation
Discoverer Code:	HDS391	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	19337	HD catalog number
Hipparcos number:	14361	Hipparcos catalog number
V1:	7.91	Magnitude of the primary
V2:	9.58	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2022	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS391

WDS 6th Orbit including measures of HDS391

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

Ephemeris of HDS391

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.052    122.6
-------------------------
2005.0     0.247    314.3
2006.0     0.238    315.5
2007.0     0.228    316.7
2008.0     0.217    318.0
2009.0     0.205    319.5
2010.0     0.193    321.2
2011.0     0.180    323.1
2012.0     0.166    325.4
2013.0     0.151    328.0
2014.0     0.136    331.3
2015.0     0.120    335.3
2016.0     0.105    340.6
2017.0     0.089    347.7
2018.0     0.075    357.7
2019.0     0.063     12.1
2020.0     0.055     31.8
2021.0     0.054     54.9
2022.0     0.059     76.1
2023.0     0.067     92.8
2024.0     0.071    106.4
2025.0     0.052    122.6
2026.0     0.022    249.1
2027.0     0.081    286.0
2028.0     0.128    292.3
2029.0     0.163    295.5
2030.0     0.191    297.6
2031.0     0.213    299.2
2032.0     0.231    300.6
2033.0     0.245    301.7
2034.0     0.257    302.8
2035.0     0.265    303.8
2036.0     0.272    304.7
2037.0     0.276    305.6
2038.0     0.279    306.4
2039.0     0.280    307.3
2040.0     0.280    308.1
2041.0     0.278    309.0
2042.0     0.276    309.9
2043.0     0.271    310.7
2044.0     0.266    311.7

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.