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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:17:12

Orbital Elements for HDS787

WDS:	HDS787	WDS ID/Discoverer
P:	11.963	Orbital period (years)
a:	0.1207	Semi-major axis (arcseconds)
i:	57.2	Inclination (degrees)
Ω:	331.1	Longitude of ascending node (degrees)
T:	1999.710	Epoch of periastron passage (year)
e:	0.244	Eccentricity
ω:	271.8	Longitude of periastron (degrees)
Start-Year:	2020.0	Year
End-Year:	2030.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS787

Position:	055229.48-021707.1	Epoch-2000 right ascension and declination
WDS-ID:	05525-0217	WDS designation
Discoverer Code:	HDS787	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	39438	HD catalog number
Hipparcos number:	27758	Hipparcos catalog number
V1:	7.77	Magnitude of the primary
V2:	8.65	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HDS787

WDS 6th Orbit including measures of HDS787

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

Ephemeris of HDS787

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.096    317.5
-------------------------
2020.0     0.114    126.0
2021.0     0.119    142.6
2022.0     0.103    160.5
2023.0     0.064    194.2
2024.0     0.057    275.4
2025.0     0.096    317.5
2026.0     0.117    337.2
2027.0     0.113    354.1
2028.0     0.098     14.7
2029.0     0.084     43.2

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.