2_20200.txt c_ck17u040.txt C/2017 U4 PANSTARRS C/2017 U4 CK17U040 C/2017 U4 (PANSTARRS) 2018 09 21.5351 7.724725 0.999262 158.9778 245.9079 158.2016 2023 02 28 7.0 2000.0 4.0