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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:40:19

Orbital Elements for USN2

WDS:	USN2	WDS ID/Discoverer
P:	4.030	Orbital period (years)
a:	0.09876	Semi-major axis (arcseconds)
i:	83.2	Inclination (degrees)
Ω:	91.6	Longitude of ascending node (degrees)
T:	2008.540	Epoch of periastron passage (year)
e:	0.74	Eccentricity
ω:	49.4	Longitude of periastron (degrees)
Start-Year:	2023.0	Year
End-Year:	2027.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for USN2

Position:	164136.62+151237.0	Epoch-2000 right ascension and declination
WDS-ID:	16416+1513	WDS designation
Discoverer Code:	USN2	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	16.4	Magnitude of the primary
V2:	16.4	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2012	Date of last observation
Orbit grade:	5	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for USN2

WDS 6th Orbit including measures of USN2

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

Ephemeris of USN2

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.073    270.6
-------------------------
2023.0     0.094    281.8
2024.0     0.016    325.0
2025.0     0.073    270.6
2026.0     0.130    276.4

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.