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Jan Oort
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Jan Hendrik Oort was a Dutch astronomer who made significant contributions to the understanding of the Milky Way and who was a pioneer in the field of radio astronomy. The New York Times called him "o
Oort in 1970
Oort in 1970
Oort by an image of the galaxy Messier 81.
Oort by an image of the galaxy Messier 81.
Commemorative plate at the house where Jan Oort was born in Franeker (Zilverstraat 18)
Commemorative plate at the house where Jan Oort was born in Franeker (Zilverstraat 18)
Oort constants
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The Oort constants A and B are empirically derived parameters that characterize the local rotational properties of our galaxy, the Milky Way, in the following manner:
Figure 1: Geometry of the Oort constants derivation, with a field star close to the Sun in the midplane of the Galaxy.
Figure 1: Geometry of the Oort constants derivation, with a field star close to the Sun in the midplane of the Galaxy.
Oort constants on a wall in Leiden, across a canal from the Leiden Observatory where Oort worked
Oort constants on a wall in Leiden, across a canal from the Leiden Observatory where Oort worked
Figure 2: Measuring the Oort constants by fitting to large data sets.
Figure 2: Measuring the Oort constants by fitting to large data sets.
Figure 3: Diagram of the various rotation curves in a galaxy
Figure 3: Diagram of the various rotation curves in a galaxy