C/2018 A3 (ATLAS)

DEPARTED

Type: Periodic Perihelion date: 12 January 2019 Perihelion distance (q): 3.3 Aphelion distance (Q) : 989 Period (years): 11,045 Eccentricity (e): 0.99 Inclination (i): 139.6 JPL orbit diagram COBS lightcurve An 18th magnitude comet was discovered in images taken with the 0.5m Schmidt at Mauna Loa on 10 January 2018 by the ATLAS (Asteroid Terrestrial-impact Last Alert System) team. It had been posted on the PCCP as A105UPd. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 15-Jan-18 18.40 0.08 17.9 0.2 22-Jan-18 18.23 0.04 18.0 0.2 14-Feb-18 17.61 0.03 17.5 0.2 21-Feb-18 17.45 0.02 17.3 0.2 11-Mar-18 17.17 0.04 16.9 0.3 20-Mar-18 16.98 0.02 16.5 0.3 06-Apr-18 17.10 0.02 16.8 0.3 19-Apr-18 17.14 0.02 16.7 0.3 06-May-18 17.13 0.02 17.0 0.3 16-May-18 17.06 0.03 16.8 0.2 04-Jun-18 17.33 0.03 17.0 0.2 16-Oct-18 16.54 0.03 15.6 0.4 24-Oct-18 16.62 0.09 15.5 0.3 10-Nov-18 16.51 0.02 15.8 0.3 19-Nov-18 16.47 0.02 15.2 0.5 03-Dec-18 16.60 0.02 15.4 0.7 11-Dec-18 16.57 0.02 15.7 0.5 18-Dec-18 16.06 0.03 15.1 0.4 30-Dec-18 16.44 0.04 15.4 0.5 06-Jan-19 16.27 0.03 14.9 0.6 13-Jan-19 16.50 0.02 15.5 0.5 10-Sep-19 17.88 0.06 16.1 0.2 24-Sep-19 17.74 0.03 17.1 0.2 01-Oct-19 17.57 0.03 16.7 0.3 08-Oct-19 17.68 0.04 17.3 0.3 22-Oct-19 17.57 0.01 17.1 0.3 29-Oct-19 17.62 0.06 17.1 0.3 20-Nov-19 17.72 0.15 17.5 0.2 27-Nov-19 18.07 0.06 17.9 0.2 20-Dec-19 18.46 0.04 18.0 0.3 27-Dec-19 18.54 0.06 18.2 0.3 16-Jan-20 19.03 0.08 18.8 0.2