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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:32:50

Orbital Elements for A1813AB

WDS:	A1813AB	WDS ID/Discoverer
P:	12.903	Orbital period (years)
a:	0.1496	Semi-major axis (arcseconds)
i:	66.1	Inclination (degrees)
Ω:	191.6	Longitude of ascending node (degrees)
T:	1989.090	Epoch of periastron passage (year)
e:	0.415	Eccentricity
ω:	113.7	Longitude of periastron (degrees)
Start-Year:	2019.0	Year
End-Year:	2031.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for A1813AB

Position:	020212.83+364301.6	Epoch-2000 right ascension and declination
WDS-ID:	02022+3643	WDS designation
Discoverer Code:	A1813AB	Discover designation and components
ADS number:	1613	Aitken Double Star catalog
HD number:	12376	HD catalog number
Hipparcos number:	9500	Hipparcos catalog number
V1:	8.7	Magnitude of the primary
V2:	8.9	Magnitude of the secondary
Equinox:		Equinox
Date:	2014	Date of last observation
Orbit grade:	1	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for A1813AB

WDS 6th Orbit including measures of A1813AB

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

Ephemeris of A1813AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.159    187.2
-------------------------
2019.0     0.081     82.1
2020.0     0.086    116.7
2021.0     0.107    142.4
2022.0     0.133    158.7
2023.0     0.154    169.8
2024.0     0.166    178.7
2025.0     0.159    187.2
2026.0     0.127    198.1
2027.0     0.061    226.2
2028.0     0.062    344.6
2029.0     0.111     15.1
2030.0     0.112     32.8

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.