Gregory W. Henry is an astronomer and research scientist for Tennessee State University

Tennessee State University

Tennessee State University is a land-grant university located in Nashville, Tennessee. TSU is the only state-funded historically black university in Tennessee.-History:...

. In 1999, Henry led one of two teams that discovered the first transiting

Astronomical transit

The term transit or astronomical transit has three meanings in astronomy:* A transit is the astronomical event that occurs when one celestial body appears to move across the face of another celestial body, hiding a small part of it, as seen by an observer at some particular vantage point...

 extrasolar planet

Extrasolar planet

An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...

, HD 209458 b

HD 209458 b

HD 209458 b is an extrasolar planet that orbits the Solar analog star HD 209458 in the constellation Pegasus, some 150 light-years from Earth's solar system, with evidence of water vapor....

. The other team was led by David Charbonneau

David Charbonneau

David Charbonneau is a Professor of Astronomy at Harvard University. His research focuses on the development of novel techniques for the detection and characterization of planets orbiting nearby, Sun-like stars...

.

Henry was also involved in the discovery of HD 149026 b

HD 149026 b

HD 149026 b is an extrasolar planet approximately 257 light-years away in the constellation of Hercules. The planet was discovered after it transited its parent star, HD 149026...

. This discovery was important in understanding how planets form and supports solar nebula accretion mode.

External links

• Henry's TSU home page