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A Planet’s Telltale Signature
This diagram illustrates how a planet passing in front of a star blocks a tiny amount of starlight. In this case, it's a planet crossing the face of a nearby star called HD 209458, located 153 light-years from Earth in the constellation Pegasus. The dip in the center of the diagram represents a 1.7 percent drop in starlight over a three-hour period as the planet moves across the star's disk. By watching this eclipse, astronomers can confirm a planet's existence.
- Object NameObject NameA name or catalog number that astronomers use to identify an astronomical object.HD 209458
- Release DateOctober 31, 2000
- Science ReleaseAstronomers Ponder Lack of Planets in Globular Cluster
- CreditNASA, T.M. Brown, D. Charbonneau, R.L. Gilliland, R.W. Noyes, & A. Burrows.
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Last Updated
Mar 28, 2025
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Media
Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov
