Dunn Solar Telescope

The Richard B. Dunn Solar Telescope sits on Sacramento Peak at 9,200 feet (2,800 meters) elevation and uses a sophisticated design where two-thirds of its structure extends below ground. This arrangement protects the instrument from temperature swings and air movements that would otherwise blur observations of the sun.

The facility was built in 1969 as the Vacuum Tower Telescope and renamed in 1998 to honor solar astronomer Richard B. Dunn. This recognition celebrated his important contributions to studying the sun and advancing solar physics research.

Scientists and researchers from multiple universities gather at this facility to study solar phenomena through advanced instruments and collaborative projects.

The instrument operates through a vacuum system that removes heat and light distortion, producing sharp images of the sun's surface. The mountain location offers low air pollution and many clear days, creating ideal conditions for solar study throughout the year.

The telescope uses mercury-float bearings that enable extremely precise rotation and keep the instrument aligned during long observation sessions. This unusual technology allows it to track the moving sun continuously without blurring the fine details it captures.