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The Telescopio San Pedro Martir project intends to build a 6.5 meters telescope with alt-azimuth mount and it has currently finished the preliminary design. The project is an association between Instituto de Astronomia de la Universidad Nacional Autonoma de Mexico and the Instituto Nacional de Astrofisica, Optica Electronica in partnership with the University of Arizona and the Smithsonian Astrophysical Observatory. The telescope preliminary design this is lead and developed at Queretaro by the Centro de Ingenieria y Desarrollo Industrial. An overview of the preliminary design and the structural design updates are summarized in this paper.

Telescopio San Pedro Martir (TSPM) project intends to build a 6.5 meters telescope with alt-azimuth design, currently at the conceptual design. The project is an association between Instituto de Astronomia de la Universidad Nacional Autonoma de Mexico (IA-UNAM) and the Instituto Nacional de Astrofisica, Optica Electronica (INAOE) in partnership with department of Astronomy and Steward Observatory of University of Arizona and Smithsonian Astrophysical Observatory of Harvard University. Conceptual design of the telescope is lead and developed by the Centro de Ingenieria y Desarrollo Industrial (CIDESI). An overview of the feasibility study and the structural conceptual design are summarized in this paper. The telescope concept is based on telescopes already commissioned such as MMT and the Baade and Clay Magellan telescopes, building up on these proven concepts. The main differences relative to the Magellan pair are; the elevation axis is located 1 meter above the primary mirror vertex, allowing for a similar field of view at the Cassegrain and both Nasmyth focal stations; instead of using a vane ends to position the secondary mirror TSPM considers an Steward platform like MMT; finally TSPM has a larger floor distance to m1 cell than Magellans and MMT. Initially TSPM will operate with an f/5 Cassegrain station, but the design considers further Nasmyth configurations from a Cassegrain f/5 up to a Gregorian f/11. The telescope design includes 7 focal stations: 1 Cassegrain; 2 Nasmyth; and 4 folded-Cassegrain. The telescope will be designed and manufactured in Mexico, will be design in Queretaro by CIDESI and built between Queretaro and Michoacan manufacturing facilities; it will be preassembled in these facilities and disassembled to send it to the San Pedro Martir Observatory for final integration. The azimuth and altitude structure is planned to be constructed in modules and transported by truck and shipped to Ensenada and finally to the OAN where is going to be finally assembled, verified and tested.