Comet C/2019 U6 or Lemmon Comet. Comet Lemmon’s delicate ion and dust tails overlap in this photo taken on June 29, 2020, with a 500-mm telescope. The comet is named for the Mt. Lemmon Survey (part of the Catalina Sky Survey) conducted near the summit of Mount Lemmon north of Tucson. Lemmon makes its initial appearance low in the western sky around July 4th in Sextans and gradually ascends, crossing the rich Virgo Cluster of galaxies at mid-month before reaching Coma Berenices at month’s end. The comet passed perihelion on June 18 and swung closest to Earth at 124 million km on June 29th. Like NEOWISE, it will slowly fade, dimming by about 1.5 magnitudes during July.