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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:18:20

Orbital Elements for USN2101+0307

WDS:	USN2101+0307	WDS ID/Discoverer
P:	7.530	Orbital period (years)
a:	0.03369	Semi-major axis (arcseconds)
i:	36.71	Inclination (degrees)
Ω:	172.22	Longitude of ascending node (degrees)
T:	2004.140	Epoch of periastron passage (year)
e:	0.55	Eccentricity
ω:	57.17	Longitude of periastron (degrees)
Start-Year:	2022.0	Year
End-Year:	2028.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for USN2101+0307

Position:	210104.80+030705.1	Epoch-2000 right ascension and declination
WDS-ID:	21010+0307	WDS designation
Discoverer Code:	USN2101+0307	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	.	Hipparcos catalog number
V1:	18.76	Magnitude of the primary
V2:	.	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	9	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for USN2101+0307

WDS 6th Orbit including measures of USN2101+0307

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

Ephemeris of USN2101+0307

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.033     91.1
-------------------------
2022.0     0.046     26.7
2023.0     0.045     44.0
2024.0     0.040     63.8
2025.0     0.033     91.1
2026.0     0.023    138.2
2027.0     0.014    281.8

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.