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

Double Star Calculator - Orbit

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

Orbital Elements for DON91AB

WDS:	DON91AB	WDS ID/Discoverer
P:	43.550	Orbital period (years)
a:	1.062	Semi-major axis (arcseconds)
i:	60.7	Inclination (degrees)
Ω:	246.5	Longitude of ascending node (degrees)
T:	1997.460	Epoch of periastron passage (year)
e:	0.72	Eccentricity
ω:	280.6	Longitude of periastron (degrees)
Start-Year:	2004.0	Year
End-Year:	2046.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for DON91AB

Position:	050228.41-211524.2	Epoch-2000 right ascension and declination
WDS-ID:	05025-2115	WDS designation
Discoverer Code:	DON91AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	32450	HD catalog number
Hipparcos number:	23452	Hipparcos catalog number
V1:	8.66	Magnitude of the primary
V2:	10.60	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2014	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for DON91AB

WDS 6th Orbit including measures of DON91AB

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

Ephemeris of DON91AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.024     16.3
-------------------------
2004.0     0.740    286.9
2005.0     0.755    292.6
2006.0     0.767    298.0
2007.0     0.778    303.4
2008.0     0.787    308.5
2009.0     0.797    313.6
2010.0     0.807    318.5
2011.0     0.819    323.3
2012.0     0.831    327.9
2013.0     0.844    332.5
2014.0     0.857    336.8
2015.0     0.872    341.1
2016.0     0.888    345.2
2017.0     0.904    349.1
2018.0     0.920    352.9
2019.0     0.937    356.6
2020.0     0.953      0.1
2021.0     0.969      3.6
2022.0     0.985      6.9
2023.0     0.999     10.1
2024.0     1.012     13.2
2025.0     1.024     16.3
2026.0     1.033     19.3
2027.0     1.040     22.2
2028.0     1.044     25.1
2029.0     1.045     28.0
2030.0     1.041     30.9
2031.0     1.032     33.9
2032.0     1.017     36.9
2033.0     0.995     40.0
2034.0     0.964     43.3
2035.0     0.922     46.9
2036.0     0.865     50.8
2037.0     0.787     55.5
2038.0     0.682     61.3
2039.0     0.533     69.9
2040.0     0.320     87.9
2041.0     0.152    176.1
2042.0     0.365    237.3
2043.0     0.521    253.4
2044.0     0.612    263.2
2045.0     0.668    270.8

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.