Exoplanets & habitability · p ≈ R★ / a

Transit Probability

The geometric chance that a planet's orbit is aligned edge-on enough for it to transit its star as seen from Earth. Only about one in 215 for an Earth-like orbit — which is why transit surveys must watch so many stars at once.

Star radius (R☉)Orbital distance (AU)

Geometric transit probability0.46505%

Formula: p ≈ R★ / a

Worked example

With the default inputs, transit probability evaluates to 0.46505 % — Sun-like star at 1 AU → ~0.47%. The validator recomputes this against the known value on every build, so the formula is checked, not asserted.

Highlights

›Earth-analog: ~0.47%

Transit Method

Knowledge connections

Associated withTransit Method

Sources

Facts on this topic will be cited from these primary and reference sources.

NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.

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Transit Probability

Worked example

Highlights

The physics behind it

Knowledge connections

Sources

Transit Probability

Worked example

Highlights

The physics behind it

Knowledge connections

Sources