What does this number measure?
A red supergiant at the heart of the constellation Scorpius. Antares has an extended, variable atmosphere. The displayed value is an estimated diameter whose definition depends on the observations and layers considered.
Compare the stated dimensions
The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.
Source and limitations
Catalogue order of magnitude; a source is provided, but this measurement has not been individually audited.
Antares: interpretation of a variable red supergiant's photosphere; approximate outline and diameter.