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Questions tagged [proper-motion]

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6 votes
1 answer
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Could an hypothetical hidden black hole companion to the sun be revealed by proper motion data?

If the Sun were in a binary star system with a black hole companion, the Sun would be orbiting the black hole, and this should be reflected in a change in the observed proper motion of nearby stars. ...
tutizeri's user avatar
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3 votes
1 answer
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How is parallax really measured?

I understand the basics of how parallax is measured (i.e. two measurements 6 months apart), but I also understand that, in reality, it would have to be more complicated than that, because stellar ...
blademan9999's user avatar