Orbital
Distance

(a=AUs)
Orbital
Period

(P=years)
Orbital
Eccentricity

(e)
Orbital
Inclination

(i=degrees)

Mass

(Earths)

Diameter

(Earths)

Density

(Earths)
Surface
Gravity

(Earths)

Metallicity
(Solar)
AB Mass Center0.0........................
Sirius A6.4350.10.592136.5706,000183......1-7.4
Disrupted H.Z.?4.766.80136.5...............
Sirius B13.450.10.592136.5341,0000.84......1-7.4


NOTE: This animation attempts to relate the possible orbits of Sirius AB (and a possibly disrupted habitable zone around Sirius A) to their common center of mass. The initial display does not show the system's actual orbital tilt (at an inclination of 136.5) from the visual perspective of an observer on Earth. Indeed, the orbital inclination of any planet that may be discovered some day around Star A would likely be different from that of the habitable zone orbit depicted here.

Sirius A and B form a close binary separated "on average" by only about 19.8 AUs of an orbital semi-major axis -- which is about the same as the distance between Uranus and our Sun ("Sol"). The companion star, is a white dwarf, stellar remnant and is so dim that it cannot be perceived with the naked eye. The distance separating Sirius A from its companion varies between 8.1 and 31.5 AUs as the two swing around in a highly eccentric orbit (e= 0.59) that takes 50.1 years to complete (Willem Henrik van den Bos, 1960).


 

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