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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:42:17

Orbital Elements for SP1AB

WDS:	SP1AB	WDS ID/Discoverer
P:	15.051	Orbital period (years)
a:	0.2547	Semi-major axis (arcseconds)
i:	50.01	Inclination (degrees)
Ω:	107.99	Longitude of ascending node (degrees)
T:	1991.247	Epoch of periastron passage (year)
e:	0.6558	Eccentricity
ω:	266.1	Longitude of periastron (degrees)
Start-Year:	2018.0	Year
End-Year:	2032.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for SP1AB

Position:	084646.51+062507.7	Epoch-2000 right ascension and declination
WDS-ID:	08468+0625	WDS designation
Discoverer Code:	SP1AB	Discover designation and components
ADS number:	6993	Aitken Double Star catalog
HD number:	74874	HD catalog number
Hipparcos number:	43109	Hipparcos catalog number
V1:	3.49	Magnitude of the primary
V2:	5.0	Magnitude of the secondary
Equinox:	2000	Equinox
Date:		Date of last observation
Orbit grade:	1	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for SP1AB

WDS 6th Orbit including measures of SP1AB

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

Ephemeris of SP1AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.260    152.2
-------------------------
2018.0     0.240    238.6
2019.0     0.219    252.9
2020.0     0.179    271.6
2021.0     0.089    314.6
2022.0     0.122     96.5
2023.0     0.202    125.1
2024.0     0.240    140.3
2025.0     0.260    152.2
2026.0     0.270    162.9
2027.0     0.274    173.1
2028.0     0.274    183.1
2029.0     0.272    193.2
2030.0     0.267    203.6
2031.0     0.262    214.3

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.