The equatorial telescope, manufactured by Raymond Augustin Mailhat, is the main instrument of the San José Observatory.

The origin of this instrument is French and was delivered to the centre as a donation by Mr. Sinforozo Molina, parent of a student in the early twentieth century.

During the subsequent amendments that were made to keep using the old telescope sought to minimize the impact of the change being able to maintain the original look of this unique instrument.

[2] It has an S-Big ST7 camera that associated equatorial lower instruments or photographic lens allows observation multitask as astronomical photography and supernova search Old altazimuth refractor used for basic education The room under the dome to dictate the various courses of astronomy, with a capacity for 20 people it is equipped with various media and tools built demonstration by members of the observatory that allow virtually experience the various astronomical phenomena In it are preserved many instruments used in astronomical research and teaching, they were restored and classified over the years by members of the Observatory Currently you can see also web OSJ Antiguos Instrumentos Also officiating as usual meeting room, the workshop is repaired where most instruments are prepared and samples classes open to the public, as well as new instruments to be used in demo them.

Undoubtedly the main activity of the Observatory San Jose, faithful to the purpose for which it was founded, is the teaching and dissemination of astronomy.