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Two green comets will shine together with the naked eye-about October 20-21, as the Orionid Meteorite Peaks. However, if you want a preview, Comets Lemmon (C/2025 A6) and Swan (C/2025 R2) are now visible from the northern hemisphere in binoculars or a small telescope. Here’s how to find them on Friday, October 10, 2025.
Comet C/2023 A3 (Tsuchinshan-Atlas) streaks in heaven on October 23, 2024 in Lhasa, an autonomous Xizang area of China. (Photo by Jiang Feibo/China News Service/VCG via Getty Images)
China News Service through Getty Images
Basic events
Of the two, Comet Lemmon is today the brightest. He recently entered the inner solar system about 1,350 years ago and will do so again around 3175. Comet Swan takes about 22,554 years to rotate the sun and visit the next visit 24,579. They are the first comets to be visible in binoculars by comet Tsuchinshan-Atlas in October 2024.
A dark sky to the north and west are the best to see the comets. On Friday, Comet Lemmon will be visible before sunrise in the northeast, near the Big Dipper, while an 86%-lit moon-moon shines to the west. Comet Swan will be low in the southwest after sunset.
In a pair of binoculars, comets appear as a small, widespread patch that changes the position slightly every day. Comet Lemmon is moving very quickly and by the beginning of next week he will also be visible in the night sky after Sunset.
In the next two weeks, both comets are projected to become brighter as both reach their closest to Earth around 20-23 October.
A diagram of detectors for Comet Lemmon for October 10, 2025, and for the next two weeks, with courtesy of Sky.org.
In-the-sky.com (used with permission)
Comet Lemmon: When and where to find it on Friday, October 10, 2025.
Distance from the sun: 78.3 million miles (126 million kilometers)
Distance from Earth: 70.7 million miles (113.8 million kilometers)
On Friday, October 10, 2025, Comet Lemmon will be visible in the northeast before dawn on the right side of the Big Dipper, low in the sky but observable in binoculars. It will be about halfway between the Dubhe stars and merak on the outside of Big Dipper’s Bowl, and Bright Star Regulus in the constellation Leo, according to Finder charts In-the-sky.com.
Comet Lemmon: When and where to find it on Friday, October 10, 2025.
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Comet Lemmon: Best time to look
The best time to search for Comet Lemmon will be a 30 -minute window that will start about 90 minutes before East where you are. For New York, Sunrise is 7:02 am Edt, so the ideal viewing time will be 5: 32-6: 02 am Edt (Venus will increase to the east during this period), though you can look earlier. The height of the comet above the horizon will vary depending on your location, but from New York, it will be about 30 degrees (about the width of your hand, with your fingers stretching, holding along the length of the arm) and climbing. In addition to fighting the growing light of Dawn on Thursday, there is 86%light-falling moon, located to the west, to face.
A diagram of detectors for the Comet Swan R2 for October 10, 2025, and for the next two weeks, a polite offer from Sky.org.
In-the-sky.com (used with permission)
Comet Swan: When and where to find it on Friday, October 10, 2025.
Distance from the sun: 76.1 million miles (122.4 million kilometers)
Distance from Earth: 30.4 million miles (48.9 million kilometers)
The Blueish-Green Comet Swan-discovered only in September-will be visible in binoculars on Friday, October 10, 2025, low in the southwest after the sunset, on the right side of the Bright Star Antares in the Skorpius constellation. Will be in accordance with the trio of bright stars describing Scorpio’s leader, according to Finder charts In-the-sky.com.
Comet Swan: When and where to find it on Friday, October 10, 2025.
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Comet Swan: Best time to look
The best time to look for the comet swan will be a 30 -minute window that will start about 90 minutes after the sunset where you are. For New York, the sunset is 6:21 pm Edt, so the ideal projection time will be 7: 51-8: 21 pm Edt. The height of the comet above the horizon will vary depending on your location, but from New York, it will be about 13 degrees (approximately the width between the small finger and the index in length) and sinking.
How bright are comets?
Comet Lemmon and Comet Swan are currently shining in Mag. 5.8 and MAG. 6, respectively, according to the Comet observation databaseWhich puts them right on the edge of the visibility of the naked eyes-if it will require a very dark sky. In practice, you will need binoculars – preferably 8×42 to 10×50 or similar – or a small telescope (through which you may see tips of about a tail in length). Explosions or deficiencies can quickly shift the apparent brightness, so grab a view while you can.
What did Zeus do to comet Lemmon
In April 2025, Comet Lemmon passed about 216 million miles (348 million km) from Jupiter. This may sound distant, but the huge weight of the gas giant was pulling to the comet, changing his orbit. According to Space.comZeus drains some of Lemmon’s orbital energy, reducing his period by nearly 200 years. Instead of returning every 1,350 years, he will now return to about 1,150 years. Zeus often acts as a “cosmic tower”, remodeling the orbits of passers -by – sometimes capturing them, sometimes completely launching from the solar system.
Check my food Every day this month for a daily “comet tracker” with Finder charts and tips on viewing Comet Lemmon and Comet Swan.
