185P/Petriew (0185P)


Type: Periodic Perihelion date: 13 July 2023 Perihelion distance (q): 0.9 Aphelion distance (Q) : 5.3 Period (years): 5.5 Eccentricity (e): 0.7 Inclination (i): 14.0 JPL orbit diagram COBS lightcurve Vance Avery Petriew, Regina, SK, reported his visual discovery of an 11th mag comet during a star party at Cypress Hills Interprovincial Park, Saskatchewan on 18 August 2001. The object's presence was also confirmed visually by R. Huziak (0.25-m reflector) and P. Campbell (0.32-m reflector) at Cyprus Hills. Additional astrometry and orbital elements by B. G. Marsden, Smithsonian Astrophysical Observatory and S. Nakano, Sumoto, Japan, suggested that the comet should have been within visual range since July, which suggests that either the comet had recently outburst (or has a steep light curve) or that the morning sky was not well patrolled by amateur comet hunters. The recovery of 2001 Q2 (P/Petriew) was announced in the IAUC on 14 January 2007, although details of the recovery by Filip Fratev had been posted on the comets mailing list on 12 January. The comet was 16th magnitude at recovery. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 02-Feb-13 18.83 0.05 18.6 0.1 14-Feb-18 14.99 0.04 11.8 0.4 14-Mar-18 15.78 0.03 12.5 1.5