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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:17:03

Orbital Elements for A2166

WDS:	A2166	WDS ID/Discoverer
P:	11.228	Orbital period (years)
a:	0.098	Semi-major axis (arcseconds)
i:	67.8	Inclination (degrees)
Ω:	197.9	Longitude of ascending node (degrees)
T:	2007.128	Epoch of periastron passage (year)
e:	0.823	Eccentricity
ω:	314.9	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 A2166

Position:	132015.78+174557.7	Epoch-2000 right ascension and declination
WDS-ID:	13203+1746	WDS designation
Discoverer Code:	A2166	Discover designation and components
ADS number:	8863	Aitken Double Star catalog
HD number:	115955	HD catalog number
Hipparcos number:	65069	Hipparcos catalog number
V1:	7.78	Magnitude of the primary
V2:	8.38	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2020	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for A2166

WDS 6th Orbit including measures of A2166

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

Ephemeris of A2166

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.141      0.7
-------------------------
2020.0     0.050    323.7
2021.0     0.079    340.2
2022.0     0.104    348.1
2023.0     0.123    353.3
2024.0     0.135    357.2
2025.0     0.141      0.7
2026.0     0.140      4.0
2027.0     0.130      7.6
2028.0     0.106     12.3
2029.0     0.056     22.6

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.