Orbital Motion Sirius A and Sirius B - The University of ... · Orbital Motion Sirius A and Sirius B Sirius A Sirius B Center of mass Orbital plane (looking perpendicular to the orbital

Orbital MotionSirius A and Sirius B

Sirius A Sirius B

Centerof mass

Orbital Motion Sirius A and Sirius B

Sirius A Sirius B

Centerof mass

Orbital plane (looking perpendicular tothe orbital plane along the red arrow)

Orbital plane (looking at an angle)

Orbital Motion Sirius A and Sirius B

Sirius A Sirius B

Centerof mass

0 31 62 93 124arc-seconds

Plane of the Sky

Sirius A on the sky

Sirius A and B in space

1850

0 31 62 93 124

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1855

0 31 62 93 124

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1860

0 31 62 93 124

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1865

0 31 62 93 124

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1870

0 31 62 93 124

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1875

0 31 62 93 124

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The "center of mass"will remain fixed in thefollowing slides.

Watch the orbitscarefully.

1880

0 31 62 93 124

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-6

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1885

0 31 62 93 124

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1890

0 31 62 93 124

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1895

0 31 62 93 124

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+6

-6

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1900

0 31 62 93 124

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0

+6

-6

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1905

0 31 62 93 124

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0

+6

-6

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1910

0 31 62 93 124

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0

+6

-6

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1915

0 31 62 93 124

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0

+6

-6

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1920

0 31 62 93 124

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+6

-6

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1925

0 31 62 93 124

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0

+6

-6

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1930

0 31 62 93 124

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0

+6

-6

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1935

0 31 62 93 124

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0

+6

-6

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seco

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1940

0 31 62 93 124

arc-seconds

0

+6

-6

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seco

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1945

0 31 62 93 124

arc-seconds

0

+6

-6

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seco

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1950

0 31 62 93 124

arc-seconds

0

+6

-6

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1955

0 31 62 93 124

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0

+6

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Search for Companions Around SiriusJ.M. Bonnet-Bidaud , F. Colas and J. Lecacheux Astronomy and Astrophysics v360, 991-996 (2000)

4 arc-minutesor 1/15 degree

W

North

E