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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:48:53

Orbital Elements for HDS2502

WDS:	HDS2502	WDS ID/Discoverer
P:	20.390	Orbital period (years)
a:	0.1341	Semi-major axis (arcseconds)
i:	136.7	Inclination (degrees)
Ω:	158.5	Longitude of ascending node (degrees)
T:	2018.040	Epoch of periastron passage (year)
e:	0.594	Eccentricity
ω:	321.5	Longitude of periastron (degrees)
Start-Year:	2015.0	Year
End-Year:	2035.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS2502

Position:	174127.68-534810.5	Epoch-2000 right ascension and declination
WDS-ID:	17415-5348	WDS designation
Discoverer Code:	HDS2502	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	86569	Hipparcos catalog number
V1:	10.17	Magnitude of the primary
V2:	10.47	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:		Flags

Double Star Orbit for HDS2502

WDS 6th Orbit including measures of HDS2502

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

Ephemeris of HDS2502

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.161     27.3
-------------------------
2015.0     0.128    326.0
2016.0     0.095    310.9
2017.0     0.056    276.0
2018.0     0.048    191.7
2019.0     0.067    135.8
2020.0     0.079    100.7
2021.0     0.094     75.6
2022.0     0.112     57.8
2023.0     0.129     45.0
2024.0     0.146     35.2
2025.0     0.161     27.3
2026.0     0.174     20.7
2027.0     0.184     15.0
2028.0     0.192      9.7
2029.0     0.196      4.8
2030.0     0.198      0.1
2031.0     0.195    355.2
2032.0     0.189    350.2
2033.0     0.178    344.7
2034.0     0.162    338.3

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.