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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 17:40:16

Orbital Elements for A551AB

WDS:	A551AB	WDS ID/Discoverer
P:	54.400	Orbital period (years)
a:	0.289	Semi-major axis (arcseconds)
i:	84.1	Inclination (degrees)
Ω:	62.6	Longitude of ascending node (degrees)
T:	2002.130	Epoch of periastron passage (year)
e:	0.442	Eccentricity
ω:	34.4	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 A551AB

Position:	082829.16-023101.6	Epoch-2000 right ascension and declination
WDS-ID:	08285-0231	WDS designation
Discoverer Code:	A551AB	Discover designation and components
ADS number:	6828	Aitken Double Star catalog
HD number:	71663	HD catalog number
Hipparcos number:	41564	Hipparcos catalog number
V1:	7.0	Magnitude of the primary
V2:	7.1	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2014	Date of last observation
Orbit grade:	2	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for A551AB

WDS 6th Orbit including measures of A551AB

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

Ephemeris of A551AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.380    245.0
-------------------------
1998.0     0.167     58.7
1999.0     0.174     60.5
2000.0     0.172     62.2
2001.0     0.160     64.0
2002.0     0.137     66.3
2003.0     0.104     69.8
2004.0     0.064     77.4
2005.0     0.025    111.3
2006.0     0.036    209.2
2007.0     0.078    227.5
2008.0     0.120    233.0
2009.0     0.158    235.7
2010.0     0.194    237.3
2011.0     0.226    238.5
2012.0     0.255    239.4
2013.0     0.280    240.1
2014.0     0.303    240.7
2015.0     0.322    241.2
2016.0     0.338    241.7
2017.0     0.352    242.1
2018.0     0.363    242.5
2019.0     0.372    242.9
2020.0     0.379    243.2
2021.0     0.383    243.6
2022.0     0.385    243.9
2023.0     0.385    244.3
2024.0     0.383    244.6
2025.0     0.380    245.0
2026.0     0.375    245.3
2027.0     0.367    245.7
2028.0     0.359    246.1
2029.0     0.348    246.5
2030.0     0.337    246.9
2031.0     0.323    247.4
2032.0     0.309    247.9
2033.0     0.292    248.5
2034.0     0.275    249.1
2035.0     0.256    249.8
2036.0     0.236    250.7
2037.0     0.215    251.7
2038.0     0.193    252.9
2039.0     0.170    254.4
2040.0     0.146    256.5
2041.0     0.122    259.3
2042.0     0.097    263.7
2043.0     0.072    271.0
2044.0     0.049    285.7
2045.0     0.033    319.0
2046.0     0.037      5.7
2047.0     0.056     31.4
2048.0     0.079     42.9
2049.0     0.103     49.2
2050.0     0.126     53.1
2051.0     0.146     55.8

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.