Orbital Motion

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Orbital Motion Sirius A and Sirius B
Sirius A
Sirius B
Center of mass
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Orbital Motion Sirius A and Sirius B
Orbital plane (looking at an angle)
Orbital plane (looking perpendicular to the
orbital plane along the red arrow)
Sirius A
Sirius B
Center of mass
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Orbital Motion Sirius A and Sirius B
Plane of the Sky
Sirius A
Sirius B
Center of mass
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Sirius A on the sky
Sirius A and B in space
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The "center of mass" will remain fixed in the
following slides. Watch the orbits carefully.
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North
W
E
4 arc-minutes or 1/15 degree
Search for Companions Around Sirius J.M. Bonnet-Bi
daud , F. Colas and J. Lecacheux Astronomy and
Astrophysics v360, 991-996 (2000)