Just observed the dreaded #BlueWalker 3 satellite -

arXiv.org

Visual Magnitude of the BlueWalker 3 Satellite

Observations have been carried out in order to assess the optical characteristics of the BlueWalker 3 spacecraft. The illumination phase function has been determined and evaluated. The average visual magnitude when seen overhead at the beginning or ending of astronomical twilight is found to be 1.5.

Read the article on arXiv.org

- for the first time during the 'good' pass

over Bochum, Germany: when it marched close to low Altair (+0.8 mag.) it was a bit fainter but rising higher it became about as bright as this star. Beware: patchy cloudiness made serious photometry impossible. But yes, this 64 square meter monster is obnoxiously bright in even partly cloudy urban skies. And they want 100+ and bigger satellites ...