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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:41:47

Orbital Elements for HDS1256

WDS:	HDS1256	WDS ID/Discoverer
P:	12.695	Orbital period (years)
a:	0.2902	Semi-major axis (arcseconds)
i:	146.9	Inclination (degrees)
Ω:	140.5	Longitude of ascending node (degrees)
T:	2011.750	Epoch of periastron passage (year)
e:	0.536	Eccentricity
ω:	60.3	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 HDS1256

Position:	084423.00-442822.0	Epoch-2000 right ascension and declination
WDS-ID:	08444-4428	WDS designation
Discoverer Code:	HDS1256	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	42881	Hipparcos catalog number
V1:	11.08	Magnitude of the primary
V2:	11.98	Magnitude of the secondary
Equinox:		Equinox
Date:	2018	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS1256

WDS 6th Orbit including measures of HDS1256

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

Ephemeris of HDS1256

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.138     20.9
-------------------------
2019.0     0.377    254.5
2020.0     0.351    241.8
2021.0     0.315    226.6
2022.0     0.271    206.9
2023.0     0.219    178.7
2024.0     0.149    128.3
2025.0     0.138     20.9
2026.0     0.244    330.9
2027.0     0.321    309.9
2028.0     0.368    295.7
2029.0     0.391    284.1
2030.0     0.398    273.3

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.