C/2019 Y4

Comet C/2019 Y4 ATLAS has been a big disappointment. It was discovered just four months ago, on December 28, 2019. Initially it brightened much more quickly than expected, and there were hopes that it might reach naked-eye visibility in late May when it will pass closest to the sun and to the earth. However its nucleus was observed to fragment by early April, and as a result it started getting dimmer instead of brighter. You can see pictures of the fragments taken by the Hubble Space Telescope by clicking on this link.