Created 08/06/07 by EF
Updated 07/13/16 by EF

The design is a high-throughput fiber-fed echelle. It is cross-dispersed, yielding a passband of 390-910 nm. It accommodates 3 optical fiber pairs (science+sky) and offers 3 resolutions, 60K, 48K and 30K. TRES superseded the Echelle spectrograph at the 1.5m, resulting in much greater observing efficiency (see the links below).

A view of the TRES head from the NE in the chamber. As of April 2014, 7 weights are mounted on each stem, rather than the 5 shown here:

Please check with Dave Latham at CfA before the start of each trimester to coordinate your observations.

  • Before you observe...        Logistics for your observing run.

  • TRES Observing primer    NEW or RUSTY observers: start here

  • TRES Observing details    Comprehensive instructions

  • ADC Cleaning notes    Instructions for experts only

  • TCS Telescope Control (TCS)

  • Tres Guider

  • Tres CCD Control PC

  • Telshell

  • TRES Showcase

  • TRES Bench Temperatures

  • Minor Planet/Zero Point observations

  • TRES zero point history UPDATE of 8/21/13

    Older Documentation

  • TRES Instrument Design (pdf; PI Andy Szentgyorgyi)
  • TRES commissioning (September 2007)
  • TRES first light (June 2007)
  • To 1.5m home page