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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:18:49

Orbital Elements for TOK371

WDS:	TOK371	WDS ID/Discoverer
P:	13.300	Orbital period (years)
a:	0.104	Semi-major axis (arcseconds)
i:	20.4	Inclination (degrees)
Ω:	79.8	Longitude of ascending node (degrees)
T:	2011.210	Epoch of periastron passage (year)
e:	0.29	Eccentricity
ω:	319.8	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 TOK371

Position:	210405.69+035850.4	Epoch-2000 right ascension and declination
WDS-ID:	21041+0359	WDS designation
Discoverer Code:	TOK371	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	200565	HD catalog number
Hipparcos number:	103983	Hipparcos catalog number
V1:	8.42	Magnitude of the primary
V2:	9.	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2018	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for TOK371

WDS 6th Orbit including measures of TOK371

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

Ephemeris of TOK371

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.075     65.3
-------------------------
2019.0     0.130    238.9
2020.0     0.125    254.9
2021.0     0.114    273.2
2022.0     0.099    296.3
2023.0     0.082    329.0
2024.0     0.072     15.2
2025.0     0.075     65.3
2026.0     0.085    106.7
2027.0     0.096    138.9
2028.0     0.107    164.4
2029.0     0.117    185.2
2030.0     0.126    203.0

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.