Comets - 90P/Gehrels - 0090P
Type Jupiter family Perihelion Date 19 June 2017 Perihelion Distance (q) 3.0 Aphelion Distance (Q) 9.2 Period (Years)   15.0 Eccentricity (e)   0.51 Inclination (i)   9.6 Click for NASA orbit diagram
Hills Observatory: 1 January 2013 to 15 September 2018
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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