405P/Lemmon (0405P)

Type: Periodic Perihelion date: 24 December 2020 Perihelion distance (q): 1.1 Aphelion distance (Q) : 6.1 Period (years): 6.9 Eccentricity (e): 0.69 Inclination (i): 9.4 JPL orbit diagram COBS lightcurve 405P/Lemmon = 2013 TL117 = 2020 U1 An unusual asteroid, classified as an Amor, was discovered during the Mt Lemmon survey with the 1.5m telescope on 4 October 2013 and was also designated as 2013 UT2. Further observations showed cometary characteristics, and the object was given a cometary designation. The Tisserand parameter of the orbit with respect to Jupiter is 2.64 and the object can approach within 0.5 au of the planet and to 0.2 au from the Earth, which it did in 1980. An object briefly appeared on the PCCP as P218YG3 before being transferred to the "Previous NEOCP Objects" page having been identified as a return of comet 2013 TL117, though it was given on the page as 2013 TL17. The PCCP recovery was by by PanSTARRS 2 on 25 October 2020. Erwin Schwab had recovered the comet on 17 October 2020 with the Calar Alto 0.8m Schmidt. Observations (VEMag = visual equivalent magnitude) Date 10x10 mag Error VEmag Coma ' 10-Jan-21 17.2 0.4 13-Jan-21 17.5 0.4 23-Jan-21 18.2 0.4 07-Feb-21 18.6 0.4 14-Feb-21 18.1 0.4 13-Mar-21 18.2 0.4 17-Mar-21 18.1 0.4 02-Apr-21 17.9 0.4 10-Apr-21 18.1 0.4