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.


NASA/ESA, T.M. Brown, D. Charbonneau, R.L. Gilliland, R.W. Noyes, & A. Burrows.

About the Image

NASA press release
NASA caption
Release date:31 October 2000, 07:00
Size:481 x 365 px

About the Object

Name:HD 209458
Type:Milky Way : Star : Circumstellar Material : Planetary System
Distance:150 light years

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37.5 KB
Screensize JPEG
101.7 KB

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