442P/McNaught (0442P)

Type: Periodic Perihelion date: 19 August 2022 Perihelion distance (q): 2.3 Aphelion distance (Q) : 7.6 Period (years): 11.1 Eccentricity (e): 0.53 Inclination (i): 6.1 JPL orbit diagram COBS lightcurve 442P/McNaught = 2000 W6 = 2011 Q3 = 2022 G1 Rob McNaught discovered a 19th magnitude comet on CCD images taken with the 0.5-m Uppsala Schmidt telescope at Siding Spring on 29 August 2011. The comet is one of those suspected to have undergone nuclear splitting according to the list of Marcos & Marcos. They link it to 208P/McMillan. Hirohisa Sato recovered the comet at 20th magnitude in images taken with the 0.51- m f/6.8 iTelescope astrograph at Siding Spring on 5 April 2022, with confirming images taken with the same telescope five days later. Following the recovery Syuichi Nakano was able to link isolated observations made on 28 November 2000 by Spacewatch to the comet. The comet passed 0.75 au from Jupiter in 1990 and 0.53 au in 2002, in encounters that made changes mostly to the angular elements. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 28-Jul-22 18.9 0.4 31-Jul-22 18.9 0.4 08-Aug-22 18.8 0.4 19-Aug-22 18.7 0.4 27-Aug-22 18.2 0.4 05-Sep-22 17.8 0.4 17-Sep-22 17.9 0.4