Comets - 90P/Gehrels - 0090P
Type Jupiter family Perihelion Date 18 June 2017 Perihelion Distance (q) 3.0 Aphelion Distance (Q) 9.1 Period (Years) 14.9 Eccentricity (e) 0.51 Inclination (i) 9.6 Click for NASA orbit diagram
Hills Observatory: 1 January 2013 to 30 March 2020
COMETS COMETS
DEEP SKY DEEP SKY
T. Gehrels (Palomar Observatory, California, USA) discovered this comet on a photographic plate obtained with the 122-cm Schmidt Telescope on 11 October 1972. The magnitude was estimated as 19 and the comet was described as diffuse, with slight condensation, but no tail. The comet was again detected on a plate exposed with the same telescope on 14 October. Although moonlight interfered during the remainder of the month, B. G. Marsden was able to calculate a set of search ephemerides which enabled Gehrels to again photograph the comet on 10 November, when the magnitude was again estimated as 19. Date 10x10 mag Error Kphot mag Coma ' 30-Jul-17 17.81 0.04 16.9 0.2 06-Aug-17 17.68 0.09 17.0 0.3 24-Aug-17 17.85 0.05 17.0 0.2 26-Oct-17 17.45 0.06 16.5 0.3 14-Nov-17 17.37 0.01 15.8 0.3 25-Dec-17 17.28 0.02 16.0 0.4 13-Feb-18 18.32 0.01 17.2 0.2
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