A recently discovered comet, named Comet C/2025 A6 Lemmon, has been visible in the sky for the past few weeks, with now being the optimal period to observe it. Astronomer David C. Fuls identified the comet on Jan. 3 through the Mount Lemmon survey program, designed to detect near-Earth objects. Although the comet made its closest approach to Earth on Tuesday near the horizon, it has since ascended higher in the sky, presenting a favorable opportunity for viewing.
Robert Massey, deputy executive director of the Royal Astronomical Society in London, noted that Comet Lemmon is currently at its peak visibility. This celestial spectacle will not reappear for another 1,300 years, so catching a glimpse now is crucial. To locate the comet, stargazers should look towards the western sky after sunset. By identifying the Big Dipper constellation, observers can use the first star in the handle as a guide to locate the bright star Arcturus in the Boötes constellation, with Comet Lemmon positioned above and to the left of Arcturus.
In the upcoming days, the comet will continue its journey towards the southwestern sky while maintaining a similar altitude. Despite amateur astronomers capturing remarkable images of Comet Lemmon, the naked eye will perceive it as a fuzzy object in the sky. Unlike prominent comets like Hale-Bopp in the late 1990s or NEOWISE in 2020, Comet Lemmon may be challenging to discern visually, but its brightness allows for easy viewing with binoculars, a somewhat rare occurrence. The comet’s visibility has notably increased in recent weeks, becoming observable to the naked eye in moderately dark areas and even with binoculars in urban settings.
With Friday being an ideal time to witness the comet due to the moon’s low illumination, the celestial display will remain visible in the Northern Hemisphere until mid-November. However, starting Sunday, Comet Lemmon will gradually descend lower on the southwestern horizon. To aid in locating the comet, individuals can utilize astronomy apps such as SkySafari and Stellarium.