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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:17:00

Orbital Elements for HU644AB

WDS:	HU644AB	WDS ID/Discoverer
P:	49.340	Orbital period (years)
a:	1.546	Semi-major axis (arcseconds)
i:	94.4	Inclination (degrees)
Ω:	90.9	Longitude of ascending node (degrees)
T:	1968.130	Epoch of periastron passage (year)
e:	0.209	Eccentricity
ω:	72.9	Longitude of periastron (degrees)
Start-Year:	2001.0	Year
End-Year:	2049.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for HU644AB

Position:	131945.58+474641.1	Epoch-2000 right ascension and declination
WDS-ID:	13198+4747	WDS designation
Discoverer Code:	HU644AB	Discover designation and components
ADS number:	8862	Aitken Double Star catalog
HD number:	115953	HD catalog number
Hipparcos number:	65026	Hipparcos catalog number
V1:	9.11	Magnitude of the primary
V2:	9.87	Magnitude of the secondary
Equinox:		Equinox
Date:	2019	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for HU644AB

WDS 6th Orbit including measures of HU644AB

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

Ephemeris of HU644AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.229    273.4
-------------------------
2001.0     0.743    100.4
2002.0     0.878     98.4
2003.0     1.004     96.9
2004.0     1.118     95.7
2005.0     1.218     94.8
2006.0     1.301     93.9
2007.0     1.364     93.2
2008.0     1.404     92.5
2009.0     1.420     91.9
2010.0     1.408     91.2
2011.0     1.366     90.5
2012.0     1.293     89.8
2013.0     1.188     88.9
2014.0     1.051     87.9
2015.0     0.883     86.5
2016.0     0.689     84.4
2017.0     0.475     80.4
2018.0     0.252     69.5
2019.0     0.095    357.6
2020.0     0.263    291.8
2021.0     0.487    281.6
2022.0     0.702    277.8
2023.0     0.901    275.7
2024.0     1.077    274.4
2025.0     1.229    273.4
2026.0     1.355    272.6
2027.0     1.456    272.0
2028.0     1.530    271.4
2029.0     1.580    270.8
2030.0     1.606    270.3
2031.0     1.609    269.8
2032.0     1.591    269.3
2033.0     1.553    268.8
2034.0     1.498    268.2
2035.0     1.426    267.6
2036.0     1.339    266.9
2037.0     1.238    266.1
2038.0     1.126    265.2
2039.0     1.003    264.0
2040.0     0.871    262.5
2041.0     0.732    260.5
2042.0     0.587    257.4
2043.0     0.440    252.4
2044.0     0.295    242.3
2045.0     0.173    215.8
2046.0     0.154    157.3
2047.0     0.262    122.9
2048.0     0.404    110.5

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.