The first observations of NEO 2025 QR1 revealed significant variations in brightness. This prompted a decision to expose it for a longer time. In addition to Bernd Koch from B72, Christoph Gerhard from the Muensterschwarzach Observatory K74 worked togetherin the image acquisition and evalution in TychoTracker.

First observations of 2025 QR1 on September 10 and 11, 2025, revealed a rotation period of 9.5 minutes (or 4.75 min) and an amplitude of 1 mag. But the whole observation covered on both days less than 30 minutes. It was clear to make a longer session of observations. 

Bernd Koch (B72) and Christoph Gerhard (K74) planned to observe on the 12th September 2025 a period of more than two hours. B72 started earlier and had a limitation in the image field after after 75 minutes. K74 came later but clouds came in after 52 minutes. At least the total session was 85 minutes and not 150 minutes.

With no limitations of the data we found a rotation period of 5.02 minutes with an amplitude of 0,83 mag.

With excluding of samples there factors of 0,5 outside the inner 50% range, we´ve got a amplitude of 0.70 mag.
But a rotation period of 10.04 minutes might be possible!