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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:00:36

Orbital Elements for DUP2

WDS:	DUP2	WDS ID/Discoverer
P:	8.603	Orbital period (years)
a:	0.07061	Semi-major axis (arcseconds)
i:	62.1	Inclination (degrees)
Ω:	126.8	Longitude of ascending node (degrees)
T:	2020.358	Epoch of periastron passage (year)
e:	0.141	Eccentricity
ω:	186.8	Longitude of periastron (degrees)
Start-Year:	2021.0	Year
End-Year:	2029.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for DUP2

Position:	105213.50+442255.9	Epoch-2000 right ascension and declination
WDS-ID:	10522+4423	WDS designation
Discoverer Code:	DUP2	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	14.99	Magnitude of the primary
V2:	15.50	Magnitude of the secondary
Equinox:		Equinox
Date:	2014	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for DUP2

WDS 6th Orbit including measures of DUP2

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

Ephemeris of DUP2

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.077    135.3
-------------------------
2021.0     0.050    329.9
2022.0     0.032     39.8
2023.0     0.056     98.9
2024.0     0.078    120.0
2025.0     0.077    135.3
2026.0     0.056    156.6
2027.0     0.033    213.8
2028.0     0.050    281.5

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.