There is a confirmed report on MPML that JUICE flared up to around mag 18 last night (May 9) despite the distance being around 5.6 million km. I don’t know how long this will last but it would be worth a try tonight if you have a chance. It is currently at a declination of -4 deg and an hour or so past the meridian. It is currently cloudy in Chelmsford.
Yes, it is surprisingly bright. I assume that it is because of the very large solar arrays and a good solar aspect angle. The RIME antenna is now deployed too after a bit of a struggle with the mechanism.