Given a differentiable vector $${\displaystyle \mathbf {r} \in \mathbb {R} ^{3}}$$ defining the instantaneous relative position of a target with respect to an observer.
Let the instantaneous See more

In astronomy, radial velocity is often measured to the first order of approximation by Doppler spectroscopy. The quantity obtained by this method may be called the … See more

• Hoffman, Kenneth M.; Kunzel, Ray (1971), Linear Algebra (Second ed.), Prentice-Hall Inc., ISBN 0135367972
• Renze, … See more

• Proper motion – Measure of observed changes in the apparent locations of stars
• Peculiar velocity – Velocity of an object relative to a rest frame
• Relative velocity – Velocity measured relative to an observer See more

• The Radial Velocity Equation in the Search for Exoplanets ( The Doppler Spectroscopy or Wobble Method ) See more