orbital motion sirius a and sirius b
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Orbital Motion
Sirius A and Sirius B
Sirius A Sirius A
Center of mass
Orbital Motion Sirius A and Sirius B
Sirius A Sirius A
Center of mass
Orbital plane (looking perpendicular to the orbital plane along the red arrow)
Orbital plane (looking at an angle)
Orbital Motion Sirius A and Sirius B
Sirius A Sirius A
Center of mass
0 31 62 93 124
arc-seconds
Plane of the Sky
Sirius A on the sky
Sirius A and B in space
1850
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1855
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1860
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1865
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1870
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1875
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
The "center of mass" will remain fixed in the following slides.
Watch the orbits carefully.
1880
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1885
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1890
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1895
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1900
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1905
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1910
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1915
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1920
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1925
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1930
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1935
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1940
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1945
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1950
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
1955
0 31 62 93 124
arc-seconds
0
+6
-6
arc-
seco
nd
s
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
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