239P/LINEAR (0239P)

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Type: Periodic Perihelion date: 9 January 2019 Perihelion distance (q): 1.7 Aphelion distance (Q) : 7.3 Period (years): 9.5 Eccentricity (e): 0.63 Inclination (i): 11.3 JPL orbit diagram COBS lightcurve An apparently asteroidal, 18th magnitude object discovered by LINEAR on 7 December 1999, with a cometlike orbit was observed by C. Hergenrother, Lunar and Planetary Laboratory, on 27 February 2000 with the Catalina 1.54-m reflector to show a 5" coma and a 10" tail in p.a. 80 deg. In August 2010, images from WISE taken in early February were linked by Gareth Williams to P/1999 XB69 (LINEAR). This then allowed images from the Mt Lemmon Survey taken at the end of October 2008 to be included in the orbital solution. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 16-Nov-18 19.81 0.11 19.4 0.2 14-Dec-18 18.20 0.05 17.4 0.2 01-Jan-19 17.33 0.01 17.1 0.2 12-Jan-19 17.26 0.02 17.0 0.2