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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:45:56

Orbital Elements for STF3121AB

WDS:	STF3121AB	WDS ID/Discoverer
P:	34.170	Orbital period (years)
a:	0.68	Semi-major axis (arcseconds)
i:	76.0	Inclination (degrees)
Ω:	24.0	Longitude of ascending node (degrees)
T:	1981.000	Epoch of periastron passage (year)
e:	0.32	Eccentricity
ω:	131.0	Longitude of periastron (degrees)
Start-Year:	2008.0	Year
End-Year:	2042.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STF3121AB

Position:	091753.45+283337.7	Epoch-2000 right ascension and declination
WDS-ID:	09179+2834	WDS designation
Discoverer Code:	STF3121AB	Discover designation and components
ADS number:	7284	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	45617	Hipparcos catalog number
V1:	7.9	Magnitude of the primary
V2:	8.0	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		Date of last observation
Orbit grade:	1	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for STF3121AB

WDS 6th Orbit including measures of STF3121AB

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

Ephemeris of STF3121AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.199    276.3
-------------------------
2008.0     0.660     28.7
2009.0     0.578     31.6
2010.0     0.476     35.6
2011.0     0.356     42.2
2012.0     0.226     56.1
2013.0     0.124     99.5
2014.0     0.171    164.1
2015.0     0.294    186.4
2016.0     0.404    195.7
2017.0     0.479    201.3
2018.0     0.514    205.8
2019.0     0.514    210.0
2020.0     0.484    214.4
2021.0     0.433    219.7
2022.0     0.370    226.7
2023.0     0.302    236.7
2024.0     0.239    252.3
2025.0     0.199    276.3
2026.0     0.201    305.3
2027.0     0.244    328.7
2028.0     0.309    343.7
2029.0     0.383    353.1
2030.0     0.457    359.5
2031.0     0.529      4.1
2032.0     0.595      7.7
2033.0     0.655     10.5
2034.0     0.706     12.9
2035.0     0.748     15.0
2036.0     0.779     17.0
2037.0     0.798     18.7
2038.0     0.804     20.5
2039.0     0.796     22.2
2040.0     0.772     24.0
2041.0     0.731     26.0

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.