C/2025 A6 (Lemmon): View from Spain

C/2025 A6 (Lemmon): View from Spain

Astrophotographer Ignacio Fernández: "C/2025 A6 (Lemmon) captured with my usual and modest astromodified a7III at 600mm. By pure chance, I was able to try the Sony 200-600mm a couple of nights ago. My intention was to make a few tests, to shoot Andromeda, Orion, and the Pleiades just to see how they look at 600mm, and I thought of giving the comet a try. I was shocked when I saw it on the camera, and after a while of trial and error, I was able to stack 23 shots—not much more than one hour of integration. For me, it’s the first time I’ve shot and finished a photo at this focal length, and this comet was a great experience to start with."

Comet Lemmon is brightening and moving into morning northern skies. Besides Comet SWAN25B and Comet ATLAS, Comet C/2025 A6 (Lemmon) is now the third comet currently visible with binoculars and on long camera exposures. Comet Lemmon was discovered early this year and is still headed into the inner Solar System. The comet will round the Sun on November 8, but first it will pass its nearest to the Earth—at about half the Earth-Sun distance—on October 21. 

Although the brightnesses of comets are notoriously hard to predict, optimistic estimates have Comet Lemmon then becoming visible to the unaided eye. The comet should be best seen in predawn skies until mid-October, when it also becomes visible in evening skies.

Spain, officially the Kingdom of Spain, is a country in Southern and Western Europe with territories in North Africa. Spanning the majority of the Iberian Peninsula, its territory also includes the Canary Islands, in the Eastern Atlantic Ocean, the Balearic Islands, in the Western Mediterranean Sea, and the autonomous cities of Ceuta and Melilla, in mainland Africa. Peninsular Spain is bordered to the north by France, Andorra, and the Bay of Biscay; to the east and south by the Mediterranean Sea and Gibraltar; and to the west by Portugal and the Atlantic Ocean.

Image Credit: Ignacio Fernández

Image Details: EXIF Sony a7 III Astro mod Sony 200-600mm f5.6/6.3 G ZWO AM5N 23 shots, 220s, ISO 1.600, f/6.3
Capture Location: Granada, Spain
Ignacio's website: https://www.instagram.com/igneis.nightscapes/
Image Date: Oct. 3, 2025

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