Journey to the Stars: The Hartebeesthoek Radio Astronomy Observatory (HartRAO)

If you have ever looked at the night sky and wondered about the invisible signals travelling through space, the Hartebeesthoek Radio Astronomy Observatory (HartRAO) is a destination that will broaden your horizons. Located in a scenic valley within the Cradle of Humankind, this facility is the only major radio astronomy observatory in Africa. Originally established by NASA in 1961 as Deep Space Station 51, it now serves as a premier research hub where scientists study everything from distant galaxies to the precise movements of the Earth itself.

Cutting-Edge Science and Massive Telescopes

The primary draw of HartRAO is the opportunity to see massive scientific instruments in action. The site is home to a 26-metre-diameter radio telescope that was once used to track NASA’s early lunar and planetary missions, such as the Mariner and Pioneer probes.

Today, the observatory operates a suite of sophisticated equipment, including:

• The 26m Radio Telescope: Now used for radio astronomy research and Very Long Baseline Interferometry (VLBI).
• Space Geodesy Tools: Including Satellite Laser Rangers (SLR) and Global Navigation Satellite System (GNSS) receivers that help measure the Earth’s crustal movements with millimetre precision.
• Educational Exhibits: The Visitors Centre features hands-on demonstrations, including water rocket launches and scale models of the solar system, making complex physics concepts “lekker” and accessible for all ages.
  Engaging Public and Educational Programmes

What makes the observatory truly special is its commitment to “science awareness.” While it is a high-level research facility, it opens its doors for specialized public visits and educational tours that are designed to spark a lifelong interest in science and technology.

During public evenings, visitors often start with an audio-visual presentation that explains what a radio telescope actually “sees”—collecting radio waves rather than visible light. If the weather is clear, these tours often conclude with traditional night sky viewing through optical telescopes, allowing you to see the planets and stars that the radio dishes are monitoring in their own unique way. It is a fantastic community resource that bridges the gap between the academic world and the curious public.

Plan Your Visit to HartRAO

Because the observatory is an active research site, all visits must be booked in advance. Public visits are generally held on a quarterly basis, typically on Friday evenings from 17:00 to 20:00.

To maintain the sensitive radio environment, all visitors are required to switch off radio transmitters, including cell phones and Bluetooth devices, as these can interfere with the telescopes’ observations. Entrance fees are approximately R65 for adults and R55 for learners and pensioners. Whether you are a student, a space enthusiast, or a family looking for a unique outing, a trip to this valley of telescopes offers a profound connection to the wider universe.

Location: Farm 502 JQ Hartebeesthoek, Broederstroom Road (R400), Krugersdorp District.

Contact: 012 301 3100 (Booking is essential).