119P/Parker-Hartley (0119P)

Type: Periodic Perihelion date: 10 August 2022 Perihelion distance (q): 2.3 Aphelion distance (Q) : 5.3 Period (years): 7.5 Eccentricity (e): 0.39 Inclination (i): 7.4 JPL orbit diagram COBS lightcurve Quentin A. Parker and Malcolm Hartley (Siding Spring Observatory, Australia) discovered images of this comet on a plate taken by Parker on 2 March 1989 with the 1.2-m U.K. Schmidt Telescope. The comet appeared as a condensed object of magnitude 16.5 and it exhibited a tail extending six arc minutes toward PA 295 degrees. Shortly after the comet's announcement, R. H. McNaught (Siding Spring) found a weak, diffuse trail on a plate exposed by Parker on 11 February, and a short time after that, McNaught proved that the February and March objects were the same comet. It was realised that this comet had passed perihelion nearly two years prior to its discovery and astronomers began looking for other images of the comet. On 7 March it was announced that S. Nakano had identified minor planet 1986 TF with the comet. A. Mrkos (Klet) and P. Jensen (Brorfelde) had both reported this as a minor planet and an orbit had been determined which indicated it was a Hilda-class minor planet. The new observations allowed a very precise determination of the orbit just 5 days after its initial discovery. Jensen reexamined his images of 1986 TF and found they were slightly diffuse when compared to other minor planets on the same plate. The comet was recovered by James V. Scotti (Spacewatch, Arizona, USA) on 23 June 1995. The comet's nucleus was then magnitude 20.5, while the total magnitude was 19.2. The coma was seven arc seconds across and a tail extended 0.88 arc minute toward PA 247 degrees. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 17-Aug-13 18.77 0.08 18.5 0.2 29-Aug-13 18.42 0.20 17.6 0.2 27-Sep-13 17.99 0.16 07-Oct-13 17.89 0.10 17.4 0.3 29-Oct-13 17.48 0.06 17.0 0.3 12-Nov-13 17.66 0.07 16.9 0.2 22-Nov-13 17.50 0.09 16.0 0.2 05-Dec-13 17.70 0.10 17.0 0.3 06-Dec-13 17.73 0.08 17.2 0.3 07-Dec-13 17.70 0.06 16.9 0.3 25-Dec-13 17.93 0.07 17.1 0.4 06-Jan-14 18.13 0.21 16.9 0.2 17-Nov-14 19.02 0.29 18.1 0.2 20-Dec-14 18.74 0.15 18.5 0.2 29-Dec-14 18.25 0.05 15.4 0.2 16-Jan-15 18.39 0.13 18.1 0.2 23-Jan-15 18.24 0.10 17.9 0.2 07-Feb-15 18.54 0.30 18.3 0.2 11-Mar-15 18.32 0.11 18.0 0.2