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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:14:46

Orbital Elements for HEI7

WDS:	HEI7	WDS ID/Discoverer
P:	30.640	Orbital period (years)
a:	0.469	Semi-major axis (arcseconds)
i:	34.4	Inclination (degrees)
Ω:	26.4	Longitude of ascending node (degrees)
T:	1996.750	Epoch of periastron passage (year)
e:	0.629	Eccentricity
ω:	46.9	Longitude of periastron (degrees)
Start-Year:	2010.0	Year
End-Year:	2040.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HEI7

Position:	203721.54+753601.5	Epoch-2000 right ascension and declination
WDS-ID:	20374+7536	WDS designation
Discoverer Code:	HEI7	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	197433	HD catalog number
Hipparcos number:	101750	Hipparcos catalog number
V1:	7.68	Magnitude of the primary
V2:	10.48	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2007	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HEI7

WDS 6th Orbit including measures of HEI7

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

Ephemeris of HEI7

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.283    339.1
-------------------------
2010.0     0.703    240.8
2011.0     0.702    244.2
2012.0     0.697    247.6
2013.0     0.687    251.0
2014.0     0.673    254.6
2015.0     0.655    258.4
2016.0     0.633    262.4
2017.0     0.607    266.7
2018.0     0.577    271.4
2019.0     0.544    276.7
2020.0     0.508    282.7
2021.0     0.468    289.6
2022.0     0.425    298.0
2023.0     0.379    308.3
2024.0     0.332    321.4
2025.0     0.283    339.1
2026.0     0.232      4.2
2027.0     0.177     44.5
2028.0     0.157    110.4
2029.0     0.229    159.1
2030.0     0.321    181.6
2031.0     0.402    194.4
2032.0     0.470    203.1
2033.0     0.526    209.8
2034.0     0.573    215.3
2035.0     0.611    220.0
2036.0     0.641    224.3
2037.0     0.665    228.1
2038.0     0.683    231.8
2039.0     0.695    235.3

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.