what object did he use to observe the orion?
Telescope
Nicolas-Claude Fabri de Peiresc
In 1610 du Vair purchased a telescope, which Peiresc and Joseph Gaultier used for observing the skies, including Jupiter's moons; his courtly suggestion that individual names from the Medici family be applied to these "Medicean stars" was not taken up. Peiresc also made detailed observations of the Orion Nebula in 1610;
what is h ii region? A region of interstellar atomic hydrogen that is ionized. where is it located? The Orion Nebula, the Eta Carinae Nebula, and the Berkeley 59 / Cepheus OB4 Complex. how far is it from earth? Sometimes several hundred light-years across. when was it first observed? 1610 and by whom? Nicolas-Claude Fabri de Peiresc who was he? French astronomer, antiquary and savant. did he like collecting things? Yes, he was an avid art collector. what kind of art did he prefer? He became the first admirers and supporters of Caravaggio in France. when did he first start his career as an astronomer? UNANSWERABLE
wiki:13030944
Nicolas-Claude Fabri de Peiresc [SEP] Astronomer
Peiresc was also an astronomer. In 1610 du Vair purchased a telescope, which Peiresc and Joseph Gaultier used for observing the skies, including Jupiter's moons; his courtly suggestion that individual names from the Medici family be applied to these "Medicean stars" was not taken up. Peiresc also made detailed observations of the Orion Nebula in 1610; Gaultier became the second person to see it in the telescope. To determine longitude with greater precision, he coordinated the observation of the lunar eclipses of 28 August 1635 right across the Mediterranean; this allowed him to work out that the Mediterranean sea was in fact 1,000 km shorter than had previously been thought.