C/2017 K4 (ATLAS)

DEPARTED

Type: Periodic Perihelion date: 8 January 2018 Perihelion distance (q): 2.6 Aphelion distance (Q) : 53.6 Period (years): 149 Eccentricity (e): 0.91 Inclination (i): 16.7 JPL orbit diagram COBS lightcurve A 17th magnitude comet was discovered in images taken with the 0.5m Schmidt at Haleakala on 26 May 2017 by the ATLAS (Asteroid Terrestrial-impact Last Alert System) team. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 21-Jun-17 15.81 0.02 15.2 0.3 29-Jun-17 15.84 0.06 15.1 0.3 11-Oct-17 15.82 0.04 12-Nov-17 15.91 0.06 15.3 0.4 14-Jul-18 18.13 0.02 17.1 0.3 21-Aug-18 18.37 0.01 17.8 0.3 04-Sep-18 18.46 0.09 17.9 0.3 01-Oct-18 18.24 0.05 17.5 0.3 10-Oct-18 18.35 0.09 18.0 0.3 20-Oct-18 18.50 0.12 17.9 0.3 28-Oct-18 18.49 0.02 17.5 0.3 08-Nov-18 18.71 0.08 18.3 0.3 27-Nov-18 18.91 0.11 18.5 0.3 10-Dec-18 19.15 0.06 18.7 0.3 26-Dec-18 19.32 0.07 18.2 0.2