Qualla: Hartebeesthoek Radio Astronomy Observatory

Hartebeesthoek Radio Astronomy Observatory: Introduction

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Olga Ernst, CC BY-SA 4.0. On 15 July 1965, the first photographs ever taken of another planet's surface from close range came home to Earth - and one of the places they arrived was a dish antenna sitting in a bowl of low hills west of Johannesburg. Mariner 4 had skimmed past Mars and beamed back its grainy frames across more than 200 million kilometres of space, each one taking hours to crawl down to the ground. The station that helped catch them was then called Deep Space Station 51. Today it is the Hartebeesthoek Radio Astronomy Observatory, and it still spends its nights listening to the universe from the same natural hollow that once shielded it from the radio noise of the city.

Image: Olga Ernst | CC BY-SA 4.0

Hartebeesthoek Radio Astronomy Observatory: A Bowl Built for Silence

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit User:(WT-shared) NJR ZA, CC BY-SA 1.0. The site was chosen for what it lacks. Hartebeesthoek lies in a natural amphitheatre of hills just south of the Magaliesberg, roughly 50 kilometres from Johannesburg, and those hills do something invaluable for a radio telescope: they block the electromagnetic clamour of human li...

Image: User:(WT-shared) NJR ZA | CC BY-SA 1.0

Hartebeesthoek Radio Astronomy Observatory: From the Moon to Mars and Back

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit User:(WT-shared) NJR ZA, Public domain. NASA built the station in 1961 as a node in its Deep Space Network, the planet-spanning chain of antennas that keeps in touch with spacecraft. From this hillside, controllers tracked the Ranger, Surveyor, and Lunar Orbiter missions that crashed into, landed on, or mapped the Moon...

Image: User:(WT-shared) NJR ZA | Public domain

Hartebeesthoek Radio Astronomy Observatory: Listening to the Whole Earth at Once

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit User: (WT-shared) NJR ZA at wts wikivoyage, CC BY-SA 3.0. The heart of the observatory is a single 26-metre dish weighing 260 tons, tuned to catch microwaves at wavelengths from 18 centimetres down to just over one. On its own it is powerful; linked to others, it becomes something close to miraculous. Through Very Long Baseline Interfer...

Image: User: (WT-shared) NJR ZA at wts wikivoyage | CC BY-SA 3.0

Hartebeesthoek Radio Astronomy Observatory: Measuring the Ground Beneath the Sky

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Petrus Potgieter, Petrus at en.wikipedia, Public domain. Hartebeesthoek does not only look up; it also takes the measure of the Earth itself. Through a programme of space geodesy, the observatory uses radio astronomy, satellite laser ranging, and GPS to track how the ground moves and where exactly this spot sits on a constantly shiftin...

Image: Petrus Potgieter, Petrus at en.wikipedia | Public domain