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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:00:26

Orbital Elements for HDS2665

WDS:	HDS2665	WDS ID/Discoverer
P:	38.440	Orbital period (years)
a:	0.4796	Semi-major axis (arcseconds)
i:	56.4	Inclination (degrees)
Ω:	36.4	Longitude of ascending node (degrees)
T:	2023.470	Epoch of periastron passage (year)
e:	0.411	Eccentricity
ω:	195.7	Longitude of periastron (degrees)
Start-Year:	2006.0	Year
End-Year:	2044.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS2665

Position:	184801.45-100844.7	Epoch-2000 right ascension and declination
WDS-ID:	18480-1009	WDS designation
Discoverer Code:	HDS2665	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	173872	HD catalog number
Hipparcos number:	92250	Hipparcos catalog number
V1:	8.64	Magnitude of the primary
V2:	11.83	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS2665

WDS 6th Orbit including measures of HDS2665

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

Ephemeris of HDS2665

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.226    251.6
-------------------------
2006.0     0.635     49.8
2007.0     0.615     52.5
2008.0     0.590     55.5
2009.0     0.561     58.8
2010.0     0.528     62.5
2011.0     0.491     66.7
2012.0     0.451     71.6
2013.0     0.408     77.5
2014.0     0.365     84.8
2015.0     0.323     94.0
2016.0     0.284    105.9
2017.0     0.255    121.0
2018.0     0.239    139.0
2019.0     0.240    158.2
2020.0     0.254    176.1
2021.0     0.274    191.7
2022.0     0.287    205.5
2023.0     0.284    218.7
2024.0     0.261    233.2
2025.0     0.226    251.6
2026.0     0.198    276.3
2027.0     0.198    304.9
2028.0     0.229    329.4
2029.0     0.280    346.5
2030.0     0.337    358.0
2031.0     0.393      6.2
2032.0     0.446     12.4
2033.0     0.494     17.3
2034.0     0.536     21.4
2035.0     0.573     24.9
2036.0     0.603     28.1
2037.0     0.627     30.9
2038.0     0.646     33.6
2039.0     0.659     36.2
2040.0     0.666     38.6
2041.0     0.668     41.1
2042.0     0.665     43.5
2043.0     0.656     46.0

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.