C/2019 T4 (ATLAS)

Type: Periodic Perihelion date: 9 June 2022 Perihelion distance (q): 4.2 Aphelion distance (Q) : 2,040 Period (years): 32,685 Eccentricity (e): 1.00 Inclination (i): 53.6 JPL orbit diagram COBS lightcurve A 19th magnitude object was discovered in images taken with the 0.5m Schmidt at Mauna Loa on 9 October 2019 by the ATLAS (Asteroid Terrestrial-impact Last Alert System) team. It had been posted on the PCCP as A10glCS. There were pre- discovery PanSTARRS 1 images from February and other observers noted its cometary nature. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 28-Dec-19 17.86 0.03 17.6 0.2 15-Jan-20 17.80 0.02 17.5 0.2 23-Jan-20 17.71 0.08 17.5 0.2 30-Jan-20 17.67 0.05 17.5 0.2 18-Jan-21 15.24 0.02 14.6 0.4 08-Feb-21 15.16 0.02 14.5 0.4 14-Feb-21 13.8 0.4 16-Mar-21 13.3 0.6 02-Apr-21 15.10 0.02 13.5 1.1 10-Apr-21 14.3 0.4 05-May-21 14.6 0.4 06-May-21 14.6 0.4 08-Mar-22 12.2 2.4 09-Mar-22 12.2 1.3 30-Mar-22 13.52 0.04 11.5 2.4 08-Apr-22 11.4 3.6 25-Apr-22 13.92 0.02 12.1 2.1 02-May-22 11.4 2.3 21-May-22 12.3 1.9 31-May-22 13.90 0.02 12.7 1.7 23-Jun-22 12.7 1.7 02-Feb-23 13.3 1.3 21-Feb-23 12.8 1.3 02-Mar-23 12.8 0.8 16-Mar-23 13.1 1.5 24-Mar-23 14.84 0.01 28-Mar-23 14.85 0.01 13.2 1.5 19-Apr-23 13.1 1.5 24-Apr-23 13.3 1.5 16-May-23 13.5 1.3 25-May-23 13.6 1.3 10-Jun-23 13.9 1.1 19-Jun-23 13.8 1.3 10-Jul-23 13.7 1.5 19-Jul-23 14.2 1.1 01-Aug-23 14.7 0.8 18-Aug-23 14.7 0.9 28-Aug-23 14.3 1.1 18-Sep-23 15.0 0.8 27-Sep-23 15.5 0.6