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

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:45:18

Orbital Elements for MLO4AB

WDS:	MLO4AB	WDS ID/Discoverer
P:	42.089	Orbital period (years)
a:	1.8247	Semi-major axis (arcseconds)
i:	127.57	Inclination (degrees)
Ω:	133.22	Longitude of ascending node (degrees)
T:	2018.053	Epoch of periastron passage (year)
e:	0.573	Eccentricity
ω:	68.09	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 MLO4AB

Position:	171857.16-345923.1	Epoch-2000 right ascension and declination
WDS-ID:	17190-3459	WDS designation
Discoverer Code:	MLO4AB	Discover designation and components
ADS number:	.	Aitken Double Star catalog
HD number:	156384	HD catalog number
Hipparcos number:	84709	Hipparcos catalog number
V1:	6.37	Magnitude of the primary
V2:	7.38	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	1	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for MLO4AB

WDS 6th Orbit including measures of MLO4AB

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

Ephemeris of MLO4AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     1.826    304.0
-------------------------
2004.0     1.608    224.8
2005.0     1.565    219.1
2006.0     1.526    213.2
2007.0     1.491    206.9
2008.0     1.459    200.4
2009.0     1.430    193.5
2010.0     1.403    186.4
2011.0     1.376    179.1
2012.0     1.344    171.4
2013.0     1.301    163.3
2014.0     1.240    154.5
2015.0     1.144    144.5
2016.0     0.996    132.1
2017.0     0.777    114.0
2018.0     0.537     79.3
2019.0     0.529     22.7
2020.0     0.789    347.5
2021.0     1.080    330.8
2022.0     1.330    321.0
2023.0     1.534    314.1
2024.0     1.697    308.6
2025.0     1.826    304.0
2026.0     1.928    300.0
2027.0     2.006    296.3
2028.0     2.064    292.9
2029.0     2.105    289.6
2030.0     2.131    286.5
2031.0     2.144    283.3
2032.0     2.146    280.3
2033.0     2.139    277.2
2034.0     2.122    274.0
2035.0     2.099    270.8
2036.0     2.069    267.5
2037.0     2.033    264.2
2038.0     1.993    260.7
2039.0     1.950    257.0
2040.0     1.903    253.2
2041.0     1.854    249.1
2042.0     1.805    244.9
2043.0     1.755    240.4
2044.0     1.705    235.6
2045.0     1.657    230.6

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.