C/2016 X1 (Lemmon)

DEPARTED

Type: Periodic Perihelion date: 29 April 2019 Perihelion distance (q): 7.6 Aphelion distance (Q) : 4,030 Period (years): 90,698 Eccentricity (e): 1.00 Inclination (i): 26.5 JPL orbit diagram COBS lightcurve An apparently asteroidal object of 20th magnitude was discovered in images taken with the Mt Lemmon Survey 1.5m reflector on 8 December 2016. There were pre- discovery images from PanSTARRS on 26 November. After posting on the NEOCP it was found to show a faint coma and tail. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 30-Dec-16 20.60 0.13 20.3 0.2 13-Feb-18 18.91 0.09 18.1 0.2 10-Mar-18 19.20 0.09 19.1 0.2 07-Oct-18 18.87 0.09 18.6 0.2 19-Nov-18 18.71 0.07 18.4 0.2 01-Jan-19 18.41 0.05 18.1 0.2 29-Oct-19 19.41 0.09 19.0 0.2 24-Dec-19 19.15 0.14 18.6 0.2 16-Feb-20 19.41 0.05 19.2 0.2