Comet Lemmon Approaches Earth, Visible to Naked Eye
Comet Lemmon (C/2025 A6) is nearing Earth, expected to be visible to the naked eye as it makes its closest approach on October 21, 2025.
Comet Lemmon (C/2025 A6), discovered on January 3, 2025, by the Mount Lemmon Survey in Arizona, is approaching Earth and is expected to be visible to the naked eye. The comet will make its closest approach on October 21, 2025, passing within approximately 56 million miles of Earth.
As it nears the Sun, Comet Lemmon is anticipated to brighten, potentially reaching an apparent magnitude of 4, making it visible without optical aid under ideal conditions. Its greenish hue is due to gases released as it approaches the Sun.
For optimal viewing, observers in the Northern Hemisphere should look to the northwest sky about 90 minutes after sunset. The comet will be located near the Big Dipper and the bright star Arcturus.
The comet's closest approach coincides with a new moon, providing dark skies favorable for observation. However, visibility may be affected by local weather conditions and light pollution.
Comet Lemmon originates from the distant Oort Cloud and has an estimated orbital period of 1,350 years.
Skywatchers are encouraged to take advantage of this rare opportunity to observe Comet Lemmon, as it will not return to the inner solar system until the year 3175.