In Hera's October 18 frame (https://aerohaber.com/first-light-hera-resolves-two-asteroids-instead-of-one/), Dimorphos appears as a single pixel clearly separated from Didymos. The first detailed images of Dimorphos are due on 25 November.
Source: https://aerohaber.com/first-light-hera-resolves-two-asteroids-instead-of-one/
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