A green comet continues to shine brightly after sunset for skywatchers in the Northern Hemisphere. For observers on Thursday, Oct. 23, Comet Lemmon (C/2025 A6) — also the fainter and Comet SWAN (C/2025 R2) — are relatively easy to find using binoculars. Lemmon will be above bright star Arcturus, low on the northwest horizon, and SWAN will be high in the southwest, just below the bright star Altair in the Summer Triangle. This is the last, best chance to see them because they’ll likely dim from now on, both because they’re now receding from Earth and the 5%-lit waxing crescent moon will brighten later in the week, bleaching the night sky and making the comets harder to find.
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