How to spot Comet Lemmon, which visits Earth once every...
Comet Lemmon (C/2025 A6), discovered earlier this year, is getting brighter as it swings close to the Sun on November 8.
It'll make its closest pass by Earth on October 21, in the constellation Bootes, east of Arcturus, which you can find by following the handle of the Big Dipper, and could become one of 2025's brightest comets—possibly even visible to the naked eye.
When and where to see the comet
Catch Comet Lemmon in the morning sky during early October; after October 16, look for it in the western evening sky.
The prime viewing window is October 22-28.
For the best view of its glowing coma and faint tail, head somewhere dark and clear about 90 minutes before sunrise or just after sunset.
Jupiter's gravity shortened the comet's orbit
Comet Lemmon only visits our skies about once every 1,155 years—Jupiter's gravity actually shortened its original orbit from 1,350 years.
Since comets spread their light out more than stars do, they look a bit dimmer than you might expect, but this is still a rare chance to spot a cosmic traveler with your own eyes.