I'm no Hubble expert, but a bit of research turned up the "HST Primer" [1] which is apparently up-to-date for the current observing cycle, and which says: > HS

I'm no Hubble expert, but a bit of research turned up the "HST Primer" [1] which is apparently up-to-date for the current observing cycle, and which says: > HST is capable of tracking moving targets with the same precision achieved for fixed targets. This is accomplished by maintaining FGS Fine Lock on guide stars and driving the FGS star sensors in the appropriate path, thus moving the telescope to track the target. Tracking under FGS control is technically possible for apparent target motions up to 5 arcsec/s. According to JPL Horizons, the current angular motion of 3I/ATLAS across the sky is <0.03 arcsec/s, so it's well within Hubble's capabilities. My understanding is that the Hubble's one-gyro mode mainly complicates the process of quickly moving from one target to another. Once the telescope is pointed at a target, the stabilization and tracking is done using guide stars without relying on gyros. Anyway, in absolute terms, 3I/ATLAS isn't moving that fast. Its orbital speed is about 3x that of Mars, but it's farther away, and (for now) much of that motion is directed inward towards the sun. [1]: https://hst-docs.stsci.edu/hsp/the-hubble-space-telescope-primer-for-cycle-33/hst-primer-observing-considerations https://hst-docs.stsci.edu/hsp/the-hubble-space-telescope-pr...