Full Breakdown
Last Chance to View Comet Lemmon and Comet SWAN
10/25/2025, 2:28:35 AM
Overview of the Cometary Event
Skywatchers have a rare opportunity on Friday, October 24, 2025, to observe two green comets, Comet Lemmon (C/2025 A6) and Comet SWAN (C/2025 R2), as they approach their closest visibility to Earth. This event marks the last chance to see these comets for over 1,150 years, as Comet Lemmon will not return until around the year 3175, while Comet SWAN has an orbital period of approximately 20,000 years.
Viewing Conditions and Timing
The best time to view both comets is approximately 90 minutes after sunset, which for New York City is between 7:29 and 7:59 p.m. EDT. Comet Lemmon will be visible in the northwest sky, near the bright star Arcturus, while Comet SWAN will appear lower in the southwestern sky, beneath the Summer Triangle stars. Observers are advised to find locations with minimal light pollution for optimal viewing conditions.
Characteristics of the Comets
Comet Lemmon was discovered on January 3, 2025, by the Mount Lemmon Survey and is currently about 57.1 million miles from Earth. It has a brightness magnitude of +5.3, making it visible to the naked eye under dark skies, although binoculars are recommended for a clearer view. Comet SWAN, discovered on September 11, 2025, is slightly dimmer with a magnitude of +7.2 and is best viewed with binoculars or a small telescope.
Official Statements & Responses
Robert Massey, deputy executive director of the Royal Astronomical Society, stated, “Comet Lemmon is pretty much at its best visibility right now,” emphasizing the rarity of this event. Jamie Cartier, a senior science reporter, noted that “this is the best remaining night to see them,” highlighting the impending full moon that will complicate visibility in the coming days.
Criticism & Opposition
Some amateur astronomers have expressed concerns about the visibility of Comet Lemmon, noting that it may not be as spectacular as previous comets like Hale-Bopp or NEOWISE. They caution that while it is reasonably bright, it may still be challenging to see without proper equipment, especially in urban areas.
Conflicting Reports & Gaps
While many sources agree on the visibility of both comets, there are discrepancies regarding their brightness and optimal viewing conditions. Some reports suggest that Comet Lemmon is visible to the naked eye, while others indicate that binoculars are necessary for a clear view. Additionally, the exact timing for optimal viewing varies slightly across different regions.
Verbatim Quotes
- “this is the best remaining night to see them,” — Jamie Cartier, Senior Science Reporter
- “Comet Lemmon is pretty much at its best visibility right now,” — Robert Massey, Deputy Executive Director, Royal Astronomical Society
- “But, that said, it's a reasonably bright comet as they go.” — Robert Massey, Deputy Executive Director, Royal Astronomical Society
Conclusion
As the comets begin to recede from Earth, Friday, October 24, 2025, presents a unique opportunity for skywatchers to witness Comet Lemmon and Comet SWAN. With the waxing crescent moon providing ideal darkness, this event is not only a visual spectacle but also a reminder of the vastness of our solar system and the rarity of such celestial occurrences. Observers are encouraged to take advantage of this fleeting chance to connect with the night sky.
