Paul Henry and Prosper Henry

The brothers Paul -Pierre Henry ( born August 21, 1848 † January 4, 1905 ) and Prosper Henry Mathieu (* December 10, 1849; † July 25, 1903 ) were French opticians and astronomers.

After the death of Jean Chacornac the two were tasked with completing the star maps. To facilitate this, they made use of photography. The necessary instruments, including the large lenses, they put themselves forth. You is the rapid development of astrophotography in the 19th century thanks to much.

They made numerous telescopes and other astronomical instruments forth. At the Observatory of Paris, each of the brothers discovered seven asteroids (see list of asteroids ). In November 1885, first discovered photographically the reflection nebula around the Pleiades.

In honor of the brothers of the 42 km wide crater Henry Frères was named the Mars crater Henry, as well as the asteroid ( 1516) Henry.