164P/Christensen (0164P)

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Type: Periodic Perihelion date: 31 May 2018 Perihelion distance (q): 1.7 Aphelion distance (Q) : 5.6 Period (years): 7.0 Eccentricity (e): 0.54 Inclination (i): 16.3 JPL orbit diagram COBS lightcurve The comet was discovered by Eric Christensen on 21 December 2004 during the course of the Catalina Sky Survey. Prediscovery images from LINEAR allowed the computation of a preliminary orbit, and further images from the 1997 return, taken in 1998 by NEAT and LONEOS allowed the comet to be numbered. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 13-Oct-18 18.13 0.13 17.7 0.2 20-Oct-18 18.00 0.07 17.0 0.4 10-Nov-18 17.90 0.05 17.5 0.3 18-Nov-18 17.80 0.03 16.8 0.3 04-Dec-18 17.72 0.04 16.8 0.4 11-Dec-18 17.78 0.07 16.9 0.4 18-Dec-18 17.73 0.03 17.0 0.4 01-Jan-19 17.60 0.05 16.7 0.4 08-Jan-19 17.66 0.02 16.5 0.4 15-Jan-19 17.61 0.04 16.7 0.3 07-May-19 18.85 0.04 18.4 0.3