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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:20:55

Orbital Elements for A111AB

WDS:	A111AB	WDS ID/Discoverer
P:	10.640	Orbital period (years)
a:	0.122	Semi-major axis (arcseconds)
i:	155.7	Inclination (degrees)
Ω:	206.5	Longitude of ascending node (degrees)
T:	2015.190	Epoch of periastron passage (year)
e:	0.538	Eccentricity
ω:	101.6	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 A111AB

Position:	003208.28-051043.3	Epoch-2000 right ascension and declination
WDS-ID:	00321-0511	WDS designation
Discoverer Code:	A111AB	Discover designation and components
ADS number:	450	Aitken Double Star catalog
HD number:	2880	HD catalog number
Hipparcos number:	2533	Hipparcos catalog number
V1:	9.4	Magnitude of the primary
V2:	9.4	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2014	Date of last observation
Orbit grade:	1	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for A111AB

WDS 6th Orbit including measures of A111AB

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

Ephemeris of A111AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.081    190.4
-------------------------
2020.0     0.170    290.6
2021.0     0.172    277.4
2022.0     0.165    263.8
2023.0     0.150    248.4
2024.0     0.123    227.8
2025.0     0.081    190.4
2026.0     0.054     80.1
2027.0     0.096      4.8
2028.0     0.129    334.2
2029.0     0.151    314.7

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.