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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 19:38:09

Orbital Elements for HU989

WDS:	HU989	WDS ID/Discoverer
P:	45.000	Orbital period (years)
a:	0.21	Semi-major axis (arcseconds)
i:	115.0	Inclination (degrees)
Ω:	79.5	Longitude of ascending node (degrees)
T:	1975.000	Epoch of periastron passage (year)
e:	0.95	Eccentricity
ω:	196.0	Longitude of periastron (degrees)
Start-Year:	2003.0	Year
End-Year:	2047.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HU989

Position:	225756.31+133642.0	Epoch-2000 right ascension and declination
WDS-ID:	22579+1337	WDS designation
Discoverer Code:	HU989	Discover designation and components
ADS number:	16403	Aitken Double Star catalog
HD number:	217075	HD catalog number
Hipparcos number:	113398	Hipparcos catalog number
V1:	7.67	Magnitude of the primary
V2:	9.52	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HU989

WDS 6th Orbit including measures of HU989

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

Ephemeris of HU989

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.225     79.9
-------------------------
2003.0     0.375     70.9
2004.0     0.368     70.6
2005.0     0.359     70.2
2006.0     0.349     69.8
2007.0     0.339     69.4
2008.0     0.326     69.0
2009.0     0.313     68.6
2010.0     0.298     68.1
2011.0     0.281     67.5
2012.0     0.263     66.9
2013.0     0.243     66.1
2014.0     0.221     65.3
2015.0     0.196     64.2
2016.0     0.168     62.8
2017.0     0.136     60.8
2018.0     0.099     57.3
2019.0     0.054     48.8
2020.0     0.010    252.6
2021.0     0.075     89.5
2022.0     0.125     84.6
2023.0     0.164     82.4
2024.0     0.197     80.9
2025.0     0.225     79.9
2026.0     0.249     79.1
2027.0     0.271     78.4
2028.0     0.290     77.8
2029.0     0.307     77.2
2030.0     0.322     76.8
2031.0     0.335     76.3
2032.0     0.347     75.9
2033.0     0.358     75.6
2034.0     0.367     75.2
2035.0     0.374     74.9
2036.0     0.381     74.6
2037.0     0.386     74.2
2038.0     0.391     73.9
2039.0     0.394     73.6
2040.0     0.396     73.3
2041.0     0.397     73.0
2042.0     0.397     72.7
2043.0     0.396     72.4
2044.0     0.394     72.1
2045.0     0.391     71.8
2046.0     0.386     71.5

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.