Astrophotographer Brennan Gilmore has captured spectacular views of the solar wind stripping a vast section from C/2025 A6 (Lemmon)'s tail, as the icy wanderer continues to brighten ahead of its close approach to Earth on Oct. 21.
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Comet Lemmon has brightened dramatically since its discovery on Jan. 3,, raising hopes that it could become a spectacular naked eye comet in October as it nears the closest point to the sun in its 1,350-year orbit on Nov. 8 — a point known as perihelion.
Gilmore's image gives us a spectacular view of Comet Lemmon's glowing green coma as it passed close to the bright star TW Leonis Minoris in the constellation Leo Minor on Oct. 4. A long luminous tail stretches away from the comet's nucleus, as material ejected from the comet reflects the light of the nearby sun.
A comet's tail is constantly being blown by the steady stream of charged particles emanating from the sun collectively as the "solar wind". As such, it will always point away from the sun, rather than simply trailing a comet's direction of travel, like the exhaust trail of an aircraft.
Gilmore released a stunning 60-minute timelapse of Comet Lemmon as a colossal section of its tail was buffeted and stripped away by the solar wind on Oct. 2, during a spectacular disconnection event. The images were taken using a Takahashi Epsilon 130D Newtonian telescope in conjunction with a ZWO astronomy camera from Cismont, Virginia.
Comet Lemmon continues to brighten, with some observations posted by the Comet Observation Database (COBS) run by the Crni Vrh Observatory in Slovenia, putting its brightness at +5.1, which would make it detectable as an extremely dim object to the unaided eye from a dark sky location.
Be sure to check out our finder's guide if you're hoping to lay eyes on Comet Lemmon as it brightens further in October and read our tips on how to photograph a comet if you want to create a permanent memory of the wandering body before it disappears from our skies,
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