2_20701.txt c_ck17k020.txt C/2017 K2 PANSTARRS C/2017 K2 CK17K020 C/2017 K2 (PANSTARRS) 2022 12 19.6881 1.796889 1.000801 236.2011 88.2358 87.5633 2023 01 28 1.5 2000.0 4.0