October 13, 2025
The constellations may be old, but the person celebrating beneath them is gloriously new by cosmic standards.
Lemmon Tree
Birthday · October 13, 2025
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APOD published October 13, 2025. Credit: Uroš Fink. A publication-date match, not a photo taken on your date. Independent of NASA.
The tree is not in danger. That's because the comet pictured just above it, Comet C/2025 A6 (Lemmon), is far in the distance, well away from the Earth. Comet Lemmon now continues to brighten as it arcs through the inner Solar System, even though it has passed its nearest to the Sun -- because it is now approaching the Earth. The comet will likely appear brightest when it is at its closest to the Earth next week, then closing to about half the Earth-Sun distance. Comet Lemmon may then be visible to the unaided eye, but it is more likely to be imaged by a camera phone -- if you know where to look. Comet Lemmon, previously best visible in the morning, is now also visible in the evening sky for northern observers: look above the western horizon just after sunset. The featured image, centered on an unsuspecting European beech tree, was taken in Slovenia about ten days ago.
Image credit: Uroš Fink