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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:22:21

Orbital Elements for HDS99AA,AB

WDS:	HDS99AA,AB	WDS ID/Discoverer
P:	8.672	Orbital period (years)
a:	0.132	Semi-major axis (arcseconds)
i:	174.5	Inclination (degrees)
Ω:	1.2	Longitude of ascending node (degrees)
T:	2020.647	Epoch of periastron passage (year)
e:	0.497	Eccentricity
ω:	302.7	Longitude of periastron (degrees)
Start-Year:	2021.0	Year
End-Year:	2029.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HDS99AA,AB

Position:	004437.15-185648.2	Epoch-2000 right ascension and declination
WDS-ID:	00446-1856	WDS designation
Discoverer Code:	HDS99AA,AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	3493	Hipparcos catalog number
V1:	11.46	Magnitude of the primary
V2:	11.74	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2022	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HDS99AA,AB

WDS 6th Orbit including measures of HDS99AA,AB

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

Ephemeris of HDS99AA,AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.197    238.1
-------------------------
2021.0     0.074     11.8
2022.0     0.125    303.7
2023.0     0.166    274.2
2024.0     0.189    254.6
2025.0     0.197    238.1
2026.0     0.189    221.6
2027.0     0.165    201.9
2028.0     0.124    172.1

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.