SANSA Space Science, previously the Hermanus Magnetic Observatory (HMO) is South Africa's national geomagnetic research facility. The observatory is situated in the town of Hermanus in the Western Cape Province and forms part of the South African National Space Agency.
The observatory is an active participant in the International Real-time Magnetic Observatory Network, one of a large number magnetic observatories which monitor and model variations of the Earth’s magnetic field.
The HMO consists of four operational groups:
Since 1957 the observatory has been operating neutron monitors. Currently this is being done on behalf of the North-West University and consists of 12 Chalk River neutron counter tubes.
Coordinates: 34°25′27″S 19°13′26″E / 34.42417°S 19.22389°E