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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 16:20:02

Orbital Elements for ALPPHE

WDS:	ALPPHE	WDS ID/Discoverer
P:	10.538	Orbital period (years)
a:	0.1035	Semi-major axis (arcseconds)
i:	128.0	Inclination (degrees)
Ω:	242.8	Longitude of ascending node (degrees)
T:	1903.235	Epoch of periastron passage (year)
e:	0.34	Eccentricity
ω:	19.8	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 ALPPHE

Position:	002616.87-421818.4	Epoch-2000 right ascension and declination
WDS-ID:	00262-4217	WDS designation
Discoverer Code:	ALPPHE	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	2261	HD catalog number
Hipparcos number:	2081	Hipparcos catalog number
V1:	2.37	Magnitude of the primary
V2:	.	Magnitude of the secondary
Equinox:		Equinox
Date:	1992	Date of last observation
Orbit grade:	9	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for ALPPHE

WDS 6th Orbit including measures of ALPPHE

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

Ephemeris of ALPPHE

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.126     43.0
-------------------------
2020.0     0.049    172.9
2021.0     0.074    106.8
2022.0     0.110     81.2
2023.0     0.131     66.8
2024.0     0.136     55.2
2025.0     0.126     43.0
2026.0     0.104     27.1
2027.0     0.076      0.5
2028.0     0.061    312.1
2029.0     0.069    260.9

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.