Since its founding in 1891, many people have passed through the doors of the Vatican Observatory. A quick perusal of our guestbook reveals several Names, including Popes, Nobel laureates, astronauts, actors, and saints. Today’s guestbook entry is from October 17, 1923, when Julien Péridier made a visit.
Péridier was an electrical engineer who worked primarily on public transportation systems in Paris. He was also an avid amateur astronomer.
In 1933, he would found an observatory at Le Houga. After his death, he willed the instruments from the observatory and his library to the McDonald Observatory (University of Texas).
In 1959 the Le Houga observatory was in a prime location to observe the occultation of the star Regulus by the planet Venus. Using photoelectric photometry equipment, the team were able to produce a good light curve of the occultation which helped to provide insights to the nature of the Venusian atmosphere.
His own astronomical work involved variable stars, planetary physics, and stellar photometry. He performed multicolor photometry on the Moon and various planets.
There is a crater on Mars that bears his name.