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NASA’s Astronomy Picture of the Day for Sept. 26, 2026, features a Perseid meteor photographed above La Palma on Aug. 15, with the Milky Way and the LST-1 telescope in view. NASA says parts of the telescope’s segmented mirror reflected the meteor’s atmospheric flash.
NASA’s Astronomy Picture of the Day for Sept. 26, 2026, shows a Perseid meteor streaking past the Milky Way above the Observatorio del Roque de los Muchachos on La Palma, Spain’s Canary Islands. The Aug. 15 photograph also captures the LST-1 telescope, whose mirror segments reflected some of the meteor’s brief atmospheric flash, linking a familiar meteor sighting with an observatory built to detect light from high-energy cosmic events.
The image, credited to photographer Jeff Dai of The World at Night, places the meteor’s bright, colorful trail beside the Milky Way’s central region. NASA’s accompanying explanation describes dark interstellar dust clouds and luminous starlight extending above the horizon. In the foreground is the 23-meter-diameter mirror of LST-1, the prototype Large-Sized Telescope.
NASA says LST-1 has 198 hexagonal mirror segments and a large, high-efficiency pixelated camera. The telescope is designed to register extremely brief flashes of visible light in the atmosphere. The APOD explanation says the flashes last about one billionth of a second and are triggered by energetic gamma rays from cosmic sources, including distant active galaxies and gamma-ray bursts.
On the night of the photograph, the atmospheric flash from the bright Perseid was reflected in some of LST-1’s mirror segments, according to NASA. The picture does not report a scientific measurement or a new telescope result; it presents the reflection as a visible detail within the scene. NASA also notes two service updates: APOD’s image-submission email address has changed, and its main site is moving from apod.nasa.gov to science.nasa.gov/apod.
A Meteor Flash Meets Gamma-Ray Astronomy
The photograph brings together two different ways of observing light from space. The Perseid trail is produced as a meteoroid enters Earth’s atmosphere, while LST-1 is designed to detect atmospheric flashes associated with high-energy gamma rays arriving from cosmic sources. The meteor’s reflected flash makes that shared atmospheric setting visible, though NASA does not claim that the telescope detected or studied the meteor as a gamma-ray event.
LST-1 is the first telescope built at the northern hemisphere site of the Cherenkov Telescope Array Observatory, NASA’s explanation says. Its design illustrates how ground-based instruments can use brief flashes in the atmosphere to investigate energetic phenomena beyond the solar system. The image offers readers a clear view of the telescope’s scale and segmented mirror, alongside the night sky it is built to observe.
LST-1 on La Palma
The Observatorio del Roque de los Muchachos sits on La Palma in Spain’s Canary Islands. It is the northern hemisphere site where LST-1, the prototype Large-Sized Telescope, was built. The Sept. 26 APOD photograph was taken there on Aug. 15, while the Perseid meteor shower was active.
NASA describes LST-1 as part of the Cherenkov Telescope Array Observatory effort and explains that the telescope’s camera and mirror are intended to capture short-lived visible flashes in the atmosphere. The APOD entry is a daily image feature: NASA says each installment presents an image or photograph of the universe with a brief explanation written by a professional astronomer. The Sept. 26 entry’s authors and editors are listed as Jerry Bonnell, Cecilia Chirenti, Robert Nemiroff and Keighley Rockcliffe.
What the Photograph Cannot Establish
NASA’s APOD text does not give the meteor’s measured brightness, speed, or trajectory, nor does it identify a particular Perseid stream measurement. It also does not say how many mirror segments reflected the flash or provide instrument data from that moment. The image and explanation therefore establish a visual reflection, but do not document a telescope observation or analysis of the meteor.
The entry calls LST-1 the first telescope built at the northern hemisphere site of the Cherenkov Telescope Array Observatory, but gives no further project timetable or operational status. The listed site move is described as underway; the APOD notice does not state when the old address will stop serving images or provide a date for completion.
APOD’s Move to Its New Site
NASA says APOD’s main site is moving from apod.nasa.gov to science.nasa.gov/apod. The Sept. 26 notice does not specify a final migration date, so readers should consult NASA’s APOD pages for the current location and any further service updates. NASA also directs people submitting images to its updated APOD submissions information because the submission email address has changed.
The next daily image is listed as “before and after.” The Sept. 26 page does not describe that upcoming picture’s subject, so its content remains to be seen when NASA publishes the next entry.
Key Questions
What does NASA’s Sept. 26, 2026, APOD show?
It shows a Perseid meteor crossing the sky above La Palma, with the central Milky Way and the LST-1 telescope mirror in the foreground.
When and where was the photograph taken?
Photographer Jeff Dai took it on Aug. 15 at the Observatorio del Roque de los Muchachos on La Palma in Spain’s Canary Islands.
What is LST-1 designed to detect?
NASA says the telescope is designed to detect very brief visible-light flashes in the atmosphere, lasting about a billionth of a second and triggered by energetic gamma rays from cosmic sources.
Did LST-1 study or detect the meteor?
The APOD explanation says some of the telescope’s mirror segments reflected the meteor’s atmospheric flash. It does not report that LST-1 detected or analyzed the meteor as a scientific event.
Where is NASA moving the APOD site?
NASA says the main site is moving from apod.nasa.gov to science.nasa.gov/apod. The APOD notice does not give a date for completing the move.
Source: primary
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