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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:38:37

Orbital Elements for ELP2

WDS:	ELP2	WDS ID/Discoverer
P:	10.310	Orbital period (years)
a:	0.111	Semi-major axis (arcseconds)
i:	119.0	Inclination (degrees)
Ω:	306.5	Longitude of ascending node (degrees)
T:	2019.510	Epoch of periastron passage (year)
e:	0.424	Eccentricity
ω:	168.5	Longitude of periastron (degrees)
Start-Year:	2020.0	Year
End-Year:	2030.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for ELP2

Position:	081350.99-073824.6	Epoch-2000 right ascension and declination
WDS-ID:	08138-0738	WDS designation
Discoverer Code:	ELP2	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:		Magnitude of the primary
V2:		Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2021	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for ELP2

WDS 6th Orbit including measures of ELP2

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

Ephemeris of ELP2

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.157    309.5
-------------------------
2020.0     0.062    109.3
2021.0     0.048     37.0
2022.0     0.083    346.1
2023.0     0.122    327.8
2024.0     0.148    317.6
2025.0     0.157    309.5
2026.0     0.149    301.6
2027.0     0.121    291.4
2028.0     0.076    271.4
2029.0     0.040    194.9

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.