Orbital
Distance

(a=AUs)
Orbital
Period

(P=years)
Orbital
Eccentricity

(e)
Orbital
Inclination

(i=degrees)

Mass

(Solar)

Diameter

(Solar)

Density

(Earths)
Surface
Gravity

(Earths)

Metallicity
(Solar)
AB Mass Center0.0........................
MLO 4 A5.8542.150.581280.750.76......1.02
Center of H.Z. A0.350.240128...............
MLO 4 B6.7542.150.581280.650.70.........
Center of H.Z. B0.230.130128...............


NOTE: This animation attempts to relate the orbits (and possible habitable zones) of Stars A and B in the MLO AB system to their common center of mass. To enlarge the display, the orbits have been arbitrarily rotated by 135 degrees. Although the initial display shows the system's actual orbital tilt (at an inclination of 128) from the visual perspective of an observer on Earth, the orbital inclination of any planet that may be discovered someday around either star would likely be different from those of the habitable zone orbits depicted here. (At around 56 to 213 or more AUs away, MLO 4 C is too far away to depict here.)

According to the new Sixth Catalog of Visual Orbits of Binary Stars, Stars A and B have an average separation of 12.6 AUs (a semi-major axis of 1.81" at a HIPPARCOS distance estimate of 20.74 ly) in a highly eccentric orbit (e= 0.58). The orbital period takes 42.15 years to complete and is inclined 128 from the perspective of an observer on Earth (Staffan Soderhjelm, 1999; and W.P. Hirst, 1950, page 458; and 1947). In turn, Stars A and B have been separated from Star C by 56 to 213 AUs (8 to 30.5") from 1889 to 1948 at an orbital inclination of 139 -- to 215 AUs (30.8") at an inclination of 136.


 

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