Arkansas Sky Observatory, Petit Jean Mountain South

Arkansas Sky Observatory (ASO) is one of the oldest privately funded observatories still active in astronomical research and public outreach in the United States. Located atop Petit Jean Mountain in Arkansas, the facility has been advancing astronomical science and education since 1971.

About Arkansas Sky Observatory

ASO operates as a major centre for amateur and professional astronomical research, focused particularly on astrometry, Near Earth Objects (NEOs), comets, and related sciences. The observatory is one of only 300 Harvard-designated astrometry measurement observatories in the world and ranks among the top observatories in the United States for volume of observations.

History

Founded in 1971, ASO began on the south brow of Petit Jean Mountain as one of the first five contributing observatories to the Harvard-Smithsonian Center for Astrophysics network. The facility has maintained its position at the forefront of amateur astronomy research for over five decades, and continues to grow its scientific contributions.

Location & Advantages

Petit Jean Mountain's elevated position at 1,200 feet provides exceptional atmospheric conditions for observing. The unique geography of the location, with the Arkansas River wrapping around the northwest side of the mountain, creates advantageous atmospheric conditions. The river forces Earth's blanket of air upward, reducing atmospheric turbulence and heat waves that would otherwise interfere with telescopic observations.

Research & Observations

In 2010 alone, ASO recorded more than 5,500 astrometric observations. The facility contributes significantly to NEO studies of Near Earth Objects, comets, and related sciences. ASO also supports research in archeology, paleontology, earth science, and science education for the general public, making it a multidisciplinary research centre.

Visiting Arkansas Sky Observatory

ASO welcomes astronomy enthusiasts and interested members of the public. For information about observing nights, public programmes, group visits, and current activities, contact the observatory through arksky.org. Multiple observing locations across Arkansas provide diverse opportunities for stargazing and research.

See Your Named Star from Here

Astronomers at ASO can locate and observe any named star from our star-naming packages using the RA and Dec coordinates provided. Browse our star catalogue to find your named star and plan observing sessions at this historic Arkansas facility.