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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:13:34

Orbital Elements for DEL4

WDS:	DEL4	WDS ID/Discoverer
P:	7.308	Orbital period (years)
a:	0.33498	Semi-major axis (arcseconds)
i:	76.1171	Inclination (degrees)
Ω:	21.9262	Longitude of ascending node (degrees)
T:	2009.262	Epoch of periastron passage (year)
e:	0.426987	Eccentricity
ω:	83.3857	Longitude of periastron (degrees)
Start-Year:	2022.0	Year
End-Year:	2028.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for DEL4

Position:	124902.75+660636.7	Epoch-2000 right ascension and declination
WDS-ID:	12490+6607	WDS designation
Discoverer Code:	DEL4	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	62556	Hipparcos catalog number
V1:	6.8	Magnitude of the primary
V2:	6.8	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 DEL4

WDS 6th Orbit including measures of DEL4

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

Ephemeris of DEL4

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.305    204.0
-------------------------
2022.0     0.252      4.6
2023.0     0.273     20.1
2024.0     0.057    147.7
2025.0     0.305    204.0
2026.0     0.295    216.2
2027.0     0.183    237.8

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.