187P/LINEAR (0187P)

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Type: Periodic Perihelion date: 15 May 2018 Perihelion distance (q): 3.9 Aphelion distance (Q) : 5.3 Period (years): 9.8 Eccentricity (e): 0.15 Inclination (i): 13.6 JPL orbit diagram COBS lightcurve An apparently asteroidal 19th mag object reported by LINEAR on 12 and 17 May 1999, and linked by G. V. Williams to LINEAR observations on 8 and 10 June by way of a cometlike orbit, was posted on The NEO Confirmation Page for additional observations. P. Pravec and P. Kusnirak, Ondrejov, reported that their 12 June CCD images showed a faint coma and a tail marginally visible to the southwest. Also, A. Sugie, Dynic Astronomical Observatory, reported strong condensation and a coma diameter of 12" on 14 June . Eric Christensen recovered comet 1999 J5 (P/LINEAR) in images taken on 9 March 2008 during the course of the Mount Lemmon Survey, with additional images taken by R A Kowalski on 10 March . Seiichi Yoshida notes that in the comet was fainter by 2 magnitudes in the 2008 return and that, in the 1999 apparition, the comet was not observed in 2000, one year after the discovery, although it would have been expected to be almost as bright as at the discovery, which suggests that the comet might have been temporarily bright in outburst in 1999. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 24-Jan-17 18.31 0.04 18.0 0.2 27-May-17 20.52 0.14 20.4 0.2 16-Apr-18 19.83 0.10 19.7 0.2 07-Jun-18 19.33 0.06 19.2 0.2 01-Jul-18 19.32 0.04 19.1 0.2 03-Aug-18 19.68 0.09 19.5 0.2