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NASA’s Astronomy Picture of the Day for September 26, 2026 features a Perseid meteor streaking beside the central Milky Way above the Roque de los Muchachos Observatory on La Palma. The image also captures the meteor’s flash reflected in segments of the prototype Large-Sized Telescope, LST-1. The photo was taken on August 15 during the annual Perseid meteor shower and was captured by photographer Jeff Dai.
NASA’s Astronomy Picture of the the Day (APOD) for September 26, 2026 features a Perseid meteor streaking through the night sky over the Observatorio del Roque de los Muchachos on La Palma in Spain’s Canary Islands, with the central Milky Way glowing above the horizon and the 23-meter mirror of the LST-1 telescope in the foreground. The image, credited to photographer Jeff Dai (TWAN), also shows the meteor’s atmospheric flash reflected in individual mirror segments of the telescope. APOD publishes a different astronomy image each day with an explanation written by a professional astronomer.
According to the APOD explanation, the meteor was photographed on August 15, during the annual Perseid meteor shower. The bright, colorful meteor trail appears next to the central band of the Milky Way, whose dark interstellar dust clouds and luminous starlight rise above the horizon in the frame.
The foreground of the scene is dominated by the mirror of the Large-Sized Telescope (LST-1), a prototype instrument and the first telescope constructed at the northern hemisphere site of the Cherenkov Telescope Array Observatory (CTAO). The telescope’s mirror consists of 198 hexagonal mirror segments paired with a large, high-efficiency, pixelized camera.
As the APOD explanation notes, LST-1 is designed to detect extremely brief flashes of visible light in the atmosphere lasting roughly a billionth of a second. These flashes, known as Cherenkov light, are triggered by energetic gamma-rays from cosmic sources such as distant active galaxies and gamma-ray bursts. On the night of the photograph, several of LST-1’s mirror segments also caught the reflection of the Perseid meteor’s atmospheric flash — an unplanned but visually striking addition to the scene.
Why This Image Resonates Beyond Aesthetics
The image pairs two very different ways of studying light from space. The Perseid meteor and the Milky Way are visible to the naked eye and familiar to amateur skywatchers, while LST-1 is built to catch gamma-ray signals far beyond human vision. Seeing both in a single frame illustrates the range of instruments operating at Roque de los Muchachos, one of the world’s leading astronomical observatory sites.
The photo also highlights the Cherenkov Telescope Array Observatory, described by APOD as an innovative international project. Its northern site on La Palma is under construction around LST-1, and images like this one draw public attention to next-generation gamma-ray astronomy, a field that studies some of the most energetic phenomena in the universe.
Finally, the accidental reflection of the meteor in the telescope’s mirror segments demonstrates how sensitive large optical surfaces are to fleeting flashes of light — the same principle, scaled to nanosecond timescales, that allows LST-1 to detect gamma-ray events from deep space.
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From Perseid Fireball to CTAO Prototype
The Perseid meteor shower occurs annually in mid-August, when Earth passes through debris left by Comet Swift-Tuttle. Meteors from this shower appear to radiate from the constellation Perseus, and bright fireballs are common, making it one of the most-watched showers of the year.
The Roque de los Muchachos Observatory, perched near the highest point of La Palma, hosts an international collection of telescopes and benefits from dark skies and stable atmospheric conditions. LST-1 serves as the prototype and first construction milestone for the northern branch of the CTAO, which will use arrays of Cherenkov telescopes to image gamma-ray showers in Earth’s atmosphere.
The APOD entry was authored and edited by Jerry Bonnell, Cecilia Chirenti, Robert Nemiroff, and Keighley Rockcliffe, and is presented as a service of ASD at NASA/GSFC, NASA Science Activation, and Michigan Technological University. APOD also noted two logistical changes: its email address for image submissions has changed, and its main NASA site is moving from apod.nasa.gov to science.nasa.gov/apod.
Details the APOD Entry Leaves Out
The APOD explanation does not specify the exact time of night the photograph was taken, the exposure length, or the camera equipment used by photographer Jeff Dai, who is credited through The World At Night (TWAN) project. The apparent brightness or magnitude of the individual meteor is also not given.
Whether LST-1’s instruments registered the meteor flash in any scientific data — beyond the visible reflection captured in the photograph — is not addressed in the entry. The current construction status of additional telescopes at the CTAO northern site is likewise not detailed in the image caption.
Coming Attractions on APOD
APOD indicated that tomorrow’s picture would show a before and after pairing, continuing the daily publication schedule. Readers can follow future entries at APOD’s new home on NASA Science at science.nasa.gov/apod as the site migration from apod.nasa.gov proceeds.
Photographers hoping to submit images should consult the updated APOD Submissions page, since the submission email address has changed. For the CTAO, construction of further telescopes at the La Palma site is expected to continue building out the observatory around the LST-1 prototype.
Key Questions
What is the ‘mirrored meteor’ in the image?
It is the reflection of the Perseid meteor’s bright atmospheric flash seen in some of the 198 hexagonal mirror segments of the LST-1 telescope, which stands in the foreground of the photograph.
When and where was the photo taken?
According to the APOD explanation, the photograph was taken on August 15 at the Observatorio del Roque de los Muchachos on La Palma, in Spain’s Canary Islands.
What is LST-1 designed to detect?
LST-1 detects extremely brief flashes of visible light in the atmosphere — lasting about a billionth of a second — triggered by energetic gamma-rays from sources such as distant active galaxies and gamma-ray bursts.
Who took the photograph?
The image is credited to Jeff Dai of The World At Night (TWAN), an international night-sky photography project.
Where can APOD be found now?
APOD noted that its main NASA site is moving from apod.nasa.gov to science.nasa.gov/apod, and that its image submission email address has changed.
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