Made available in DSpace on 2022-04-29T08:37:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-11-10; Comet C/2014 UN271 (Bernardinelli-Bernstein), incoming from the Oort cloud, is remarkable in having the brightest (and presumably largest) nucleus of any well-measured comet and having been discovered at the heliocentric distance r h ≈ 29 au, farther than any Oort cloud comet. In this work, we describe ...