2_20701.txt c_ck19y04b.txt C/2019 Y4-B ATLAS C/2019 Y4-B CK19Y04b C/2019 Y4-B (ATLAS) 2020 05 30.8754 0.254614 1.000021 177.3968 120.7650 45.3511 2023 05 23 12.1 2000.0 6.0