Astronomy & Space Science · AST-596
Astrometry & Transit Timing Variations: Foundations
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Overview
Core model: Astrometry & Transit Timing Variations
Astrometry and transit timing variations detect planets through changes in stellar position or in the timing of other planets rather than through brightness depth or Doppler speed alone. Both techniques are especially powerful in systems where gravitational interactions provide information unavailable from a single isolated orbit.
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- 01How We Find and Characterize ExoplanetsOpen source ↗
NASA Science
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Astrometry and transit timing variations detect planets through changes in stellar position or in the timing of other planets rather than through brightness depth or Doppler speed alone.
supported · checked Sep 22, 2026Precision astrometry measures stellar reflex motion, while Kepler systems exhibit repeatable timing patterns that require interacting planets.
supported · checked Sep 22, 2026A companion displaces the host star around the center of mass, producing an angular wobble whose size increases for massive planets on wider orbits and nearby stars.
supported · checked Sep 22, 2026