"He was a brilliant character... Extraordinarily warm, profound and authentic ,a great scholar and also a storyteller, a writer," said Jacob, who was close to Brahic.
An expert on the solar system, in 1984 he launched a programme which led to the discovery, with US astronomer William Hubbard, of the rings around the gaseous planet Neptune.
French President Francois Hollande in a statement hailed a great mind "who knew how to make simple the mysteries of the sky".
Born into a modest family in Nazi-occupied Paris in 1942, Brahic was initiated into astrophysics after the war by Evry Schatzman, considered the father of the discipline in France.
Also Read
In the 1980s, Brahic became a specialist in exploring our solar system with the help of the NASA Voyager and later US-Europe Cassini unmanned missions, which continue to this day.
He was an astrophysicist at the Commission for Atomic Energy and Alternative Energies (CEA) and a professor at the University of Paris.
It was his interest in Saturn and its rings which led him to launch his Neptune research.
In 1990 an asteroid, number 3488, was named Brahic in his honour.
Keen on bringing astrophysics to a wider public, Brahic wrote several books.
His last book "Worlds Elsewhere; Are We Alone" was published last year by Odile Jacob.