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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:41:05

Orbital Elements for 20OPH

WDS:	20OPH	WDS ID/Discoverer
P:	35.500	Orbital period (years)
a:	0.46	Semi-major axis (arcseconds)
i:	74.0	Inclination (degrees)
Ω:	118.0	Longitude of ascending node (degrees)
T:	1981.200	Epoch of periastron passage (year)
e:	0.8	Eccentricity
ω:	34.0	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 20OPH

Position:	164950.02-104658.7	Epoch-2000 right ascension and declination
WDS-ID:	16498-1047	WDS designation
Discoverer Code:	20OPH	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	151769	HD catalog number
Hipparcos number:	82369	Hipparcos catalog number
V1:	4.6	Magnitude of the primary
V2:	8. >	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	9	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for 20OPH

WDS 6th Orbit including measures of 20OPH

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

Ephemeris of 20OPH

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.642    301.7
-------------------------
2008.0     0.428    318.4
2009.0     0.380    320.6
2010.0     0.328    323.4
2011.0     0.272    327.4
2012.0     0.213    333.5
2013.0     0.153    344.4
2014.0     0.098      8.4
2015.0     0.079     59.8
2016.0     0.106    103.2
2017.0     0.037    165.9
2018.0     0.158    284.1
2019.0     0.284    291.8
2020.0     0.380    295.1
2021.0     0.456    297.1
2022.0     0.517    298.6
2023.0     0.568    299.8
2024.0     0.609    300.8
2025.0     0.642    301.7
2026.0     0.669    302.6
2027.0     0.690    303.3
2028.0     0.706    304.1
2029.0     0.716    304.8
2030.0     0.722    305.5
2031.0     0.723    306.1
2032.0     0.721    306.8
2033.0     0.714    307.5
2034.0     0.704    308.2
2035.0     0.690    308.9
2036.0     0.673    309.7
2037.0     0.651    310.5
2038.0     0.627    311.4
2039.0     0.599    312.3
2040.0     0.567    313.4
2041.0     0.532    314.5

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.