 Jewitt and Luu compared 2I/Borisov to C/2019 J2, another comet of similar size that disintegrated in May 2019 at a distance of 1.9 au from the Sun.In the event that the nucleus disintegrates, as is sometimes seen with small comets, Hubble can be used to study the evolution of the disintegration process.The severe outburst in February-March 2020, led to suspected "ongoing nucleus fragmentation" from the comet by March 12.