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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:57:04

Orbital Elements for HU581

WDS:	HU581	WDS ID/Discoverer
P:	54.110	Orbital period (years)
a:	0.234	Semi-major axis (arcseconds)
i:	83.2	Inclination (degrees)
Ω:	296.7	Longitude of ascending node (degrees)
T:	1992.130	Epoch of periastron passage (year)
e:	0.797	Eccentricity
ω:	45.0	Longitude of periastron (degrees)
Start-Year:	1998.0	Year
End-Year:	2052.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HU581

Position:	182254.84+145811.0	Epoch-2000 right ascension and declination
WDS-ID:	18229+1458	WDS designation
Discoverer Code:	HU581	Discover designation and components
ADS number:	11300	Aitken Double Star catalog
HD number:	.	HD catalog number
Hipparcos number:	90075	Hipparcos catalog number
V1:	8.8	Magnitude of the primary
V2:	9.4	Magnitude of the secondary
Equinox:		Equinox
Date:	1990	Date of last observation
Orbit grade:	4	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HU581

WDS 6th Orbit including measures of HU581

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

Ephemeris of HU581

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.251    125.4
-------------------------
1998.0     0.216    117.2
1999.0     0.236    117.7
2000.0     0.253    118.2
2001.0     0.268    118.6
2002.0     0.280    118.9
2003.0     0.291    119.2
2004.0     0.300    119.5
2005.0     0.307    119.8
2006.0     0.313    120.1
2007.0     0.318    120.3
2008.0     0.322    120.6
2009.0     0.324    120.8
2010.0     0.326    121.1
2011.0     0.326    121.3
2012.0     0.326    121.6
2013.0     0.325    121.8
2014.0     0.323    122.1
2015.0     0.320    122.3
2016.0     0.316    122.6
2017.0     0.312    122.8
2018.0     0.306    123.1
2019.0     0.301    123.4
2020.0     0.294    123.7
2021.0     0.287    124.0
2022.0     0.279    124.3
2023.0     0.270    124.7
2024.0     0.261    125.0
2025.0     0.251    125.4
2026.0     0.241    125.9
2027.0     0.230    126.3
2028.0     0.218    126.9
2029.0     0.206    127.4
2030.0     0.193    128.1
2031.0     0.179    128.8
2032.0     0.165    129.7
2033.0     0.151    130.8
2034.0     0.135    132.0
2035.0     0.119    133.7
2036.0     0.103    135.8
2037.0     0.086    138.7
2038.0     0.069    143.1
2039.0     0.052    150.5
2040.0     0.036    164.8
2041.0     0.024    196.6
2042.0     0.026    243.4
2043.0     0.038    270.7
2044.0     0.053    283.5
2045.0     0.062    291.3
2046.0     0.046    299.5
2047.0     0.019     94.9
2048.0     0.078    111.7
2049.0     0.124    114.3
2050.0     0.159    115.7
2051.0     0.189    116.5

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.