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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:13:04

Orbital Elements for HDS2908

WDS:	HDS2908	WDS ID/Discoverer
P:	12.740	Orbital period (years)
a:	0.112	Semi-major axis (arcseconds)
i:	80.8	Inclination (degrees)
Ω:	107.8	Longitude of ascending node (degrees)
T:	2007.440	Epoch of periastron passage (year)
e:	0.518	Eccentricity
ω:	338.9	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 HDS2908

Position:	202143.04-363635.9	Epoch-2000 right ascension and declination
WDS-ID:	20217-3637	WDS designation
Discoverer Code:	HDS2908	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	193464	HD catalog number
Hipparcos number:	100417	Hipparcos catalog number
V1:	8.25	Magnitude of the primary
V2:	8.45	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS2908

WDS 6th Orbit including measures of HDS2908

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

Ephemeris of HDS2908

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.129    280.7
-------------------------
2019.0     0.032    310.4
2020.0     0.043    100.3
2021.0     0.046    118.5
2022.0     0.017    209.0
2023.0     0.057    268.3
2024.0     0.098    276.9
2025.0     0.129    280.7
2026.0     0.151    283.2
2027.0     0.163    285.1
2028.0     0.163    286.9
2029.0     0.150    288.9
2030.0     0.123    291.4

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.