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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:18:14

Orbital Elements for HDS1891

WDS:	HDS1891	WDS ID/Discoverer
P:	12.510	Orbital period (years)
a:	0.185	Semi-major axis (arcseconds)
i:	162.6	Inclination (degrees)
Ω:	99.9	Longitude of ascending node (degrees)
T:	2014.760	Epoch of periastron passage (year)
e:	0.192	Eccentricity
ω:	273.2	Longitude of periastron (degrees)
Start-Year:	2019.0	Year
End-Year:	2031.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS1891

Position:	133036.43-423750.5	Epoch-2000 right ascension and declination
WDS-ID:	13306-4238	WDS designation
Discoverer Code:	HDS1891	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	117383	HD catalog number
Hipparcos number:	65906	Hipparcos catalog number
V1:	10.01	Magnitude of the primary
V2:	11.09	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS1891

WDS 6th Orbit including measures of HDS1891

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

Ephemeris of HDS1891

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.176    274.0
-------------------------
2019.0     0.202     49.7
2020.0     0.208     27.8
2021.0     0.210      6.9
2022.0     0.209    346.0
2023.0     0.204    324.4
2024.0     0.193    301.0
2025.0     0.176    274.0
2026.0     0.156    240.5
2027.0     0.143    198.8
2028.0     0.148    154.4
2029.0     0.166    116.7
2030.0     0.184     86.7

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.