Pecker was a member of the Académie des Sciences and director of the Nice Observatory. He was the secretary-general of the International Astronomical Union from 1964 to 1967. Pecker was the President of the Société astronomique de France (SAF), the French amateur astronomical society, from 1973–1976.
A minor planet (1629 Pecker) is named after him.< Pecker was a vocal opponent of astrology and pseudo-science and was the president of the Association française pour l'information scientifique (AFIS).
- List of presidents of the Société astronomique de France
- "Thèse d'Élizabeth Teissier : réactions dans les médias". Science and Pseudo-science. ASIS. Retrieved 29 March 2017.
- "Les Membres". Bureau des Longitudes. Retrieved 29 March 2017.