The Gemini North telescope n Hawaii, over 8 meters long, was able to zoom in on Comet NEOWISE as it pass through the inner solar system. Here’s more from Astronomy Now:
The close-up observations, led by Michal Drahus and Piotr Guzik of Jagiellonian University in Krakow, were carried out under a program to study the rotational dynamics of the comet. Despite limitations imposed by the comet’s proximity to the Sun, the researchers were able to confirm a 7.5-hour rotation period by measuring the spiral outflow of molecular gas as NEOWISE spun about.
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