2_20200.txt c_ck18e09f.txt C/2018 EF9 Lemmon C/2018 EF9 CK18E09F C/2018 EF9 (Lemmon) 2018 05 21.0386 1.562212 0.996521 72.6352 172.5619 84.6291 2023 02 28 18.0 2000.0 2.0