2_20701.txt c_ck18u010.txt C/2018 U1 Lemmon C/2018 U1 CK18U010 C/2018 U1 (Lemmon) 2021 11 02.9514 4.991649 1.001271 180.4524 75.5056 108.3236 2023 11 28 5.0 2000.0 4.0