C/2016 N4 (MASTER)

DEPARTED

Type: Periodic Perihelion date: 16 September 2017 Perihelion distance (q): 3.2 Aphelion distance (Q) : 10,507 Period (years): 380,987 Eccentricity (e): 1.00 Inclination (i): 72.6 JPL orbit diagram COBS lightcurve An apparently asteroidal object of 17th magnitude found with the MASTER 0.4m reflector at Teneriffe on 15 July 2016 (and for a while designated as 2016 NZ38) was shown to have cometary features during follow-up astrometry by other observers. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 30-Aug-16 16.26 0.02 15.0 0.5 06-Sep-16 16.19 0.02 15.2 0.4 22-Sep-16 16.05 0.02 14.7 0.6 29-Sep-16 15.93 0.07 12.6 0.6 09-Oct-16 16.18 0.01 15.2 0.5 28-Oct-16 16.33 0.01 15.5 0.4 04-Nov-16 16.33 0.05 15.5 0.4 24-Nov-16 16.39 0.02 15.6 0.5 27-Dec-16 16.43 0.03 15.7 0.4 05-May-17 16.44 0.10 15.0 0.4 28-May-17 16.59 0.05 13.3 0.5 22-Jun-17 16.41 0.01 14.6 0.8 04-Jul-17 16.51 0.03 14.4 0.7 20-Jul-17 16.41 0.02 13.9 0.7 30-Jul-17 16.37 0.02 15.9 0.4 19-Aug-17 16.29 0.02 14.8 0.5 27-Aug-17 16.30 0.01 15.4 0.5 14-Sep-17 16.27 0.03 14.9 0.7 22-Sep-17 16.27 0.01 15.0 0.6 11-Oct-17 15.78 0.01 14.7 0.5 25-Oct-17 16.44 0.02 15.2 0.6 18-Feb-18 16.61 0.04 15.0 0.6 06-Mar-18 16.93 0.04 14.7 0.4 13-Mar-18 16.79 0.03 15.1 0.6 02-May-18 17.46 0.13 16.0 0.5 15-Jul-18 17.47 0.05 16.1 0.5 04-Dec-18 17.97 0.10 16.8 0.4 12-Dec-18 17.98 0.06 16.6 0.4 01-Jan-19 17.97 0.19 16.7 0.4 30-Apr-19 18.48 0.06 17.0 0.4 07-May-19 18.56 0.04 17.6 0.4 25-May-19 18.87 0.19 17.6 0.4 02-Jun-19 19.05 0.26 18.5 0.2