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NASA’s Astronomy Picture of the Day for Oct. 12, 2026, features a sequence of exposures showing Jupiter’s four bright Galilean moons alongside Earth’s Moon. The unusual five-moon view was possible because the Moon passed directly in front of Jupiter last week, as seen from the photographer’s location in New York.
NASA’s Astronomy Picture of the Day for Oct. 12, 2026, features a sequence of exposures showing Jupiter’s four bright Galilean moons lined up near Earth’s Moon. The view was possible because the Moon passed directly in front of Jupiter last week, as seen from Westchester, New York, offering a chance to show five natural satellites in one composition.
The NASA explanation says the featured image combines a series of exposures taken near the alignment. Earth’s Moon appears at the lower left as a bright crescent that is overexposed; its darker side, at the upper right of the lunar disk, is faintly lit by earthshine—sunlight reflected from Earth onto the Moon.
Above Earth’s Moon, the four Galilean satellites appear in this order from bottom to top: Ganymede, Io, Callisto and Europa. They are Jupiter’s four brightest large moons and were first observed by Galileo Galilei in 1610. NASA’s description says Callisto, Ganymede and Io are larger than Earth’s Moon, while Europa is slightly smaller.
The image is credited to Chirag Upreti. NASA’s Astronomy Picture of the Day entry is dated Oct. 12 and provides an explanation written by professional astronomers. The source describes the picture as a sequence of exposures near the alignment, rather than claiming it was a single exposure or an unaltered view through the camera.
A Rare View of Five Moons
The image brings together satellites associated with two different planetary systems: Earth’s Moon in the foreground and four moons orbiting Jupiter. Their apparent lineup is a viewing geometry from Earth, not a physical arrangement in which the moons occupy one straight line in space. The photograph’s value is in making that geometry visible in a single composition.
For readers, the picture also illustrates why observing the sky depends on timing and perspective. Earth’s Moon moved across Jupiter from the photographer’s viewpoint, allowing the moons and planet to be framed together. The inclusion of Jupiter’s satellites is of interest beyond the image itself: NASA’s Juno spacecraft is orbiting Jupiter and has made close passes near three of the four moons, according to the APOD explanation.
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How the Lunar Alignment Appeared
NASA’s Astronomy Picture of the Day publishes an image or photograph of the cosmos each day, accompanied by a brief explanation. For the Oct. 12 entry, the explanatory text asks, “How many moons can you see?” and gives the answer as five: four orbiting Jupiter and Luna, Earth’s Moon. The NASA page credits the service to NASA’s Astrophysics Science Division at Goddard Space Flight Center, NASA Science Activation and Michigan Technological University.
The alignment described in the entry is an occultation: from a particular location on Earth, the Moon appeared to move directly in front of Jupiter. Such apparent crossings depend on where an observer is located and when the objects line up along the observer’s line of sight. The image’s faint detail on the Moon’s night side is not direct sunlight; NASA identifies it as earthshine.
Jupiter’s four moons are commonly called the Galilean satellites because Galileo observed them in the early 17th century. They differ greatly in size and character, but this image is presented as an observational record of their apparent positions, not as a detailed study of their surfaces or conditions. NASA’s text notes only that Juno has passed close to three of them; it does not specify those flybys in this entry.
Image and Alignment Details
The source identifies the location as Westchester, New York, and says the image is a series of exposures taken near the alignment. It does not give the exact date and time of each exposure, the camera or lens settings, or the duration of the sequence. The page also does not provide measurements of the apparent separations between Jupiter, its moons and Earth’s Moon.
The phrase “moved directly in front” describes the view from the observer’s location; the entry does not give a wider visibility map or say how the event appeared from other places. It also does not specify which three Galilean moons Juno has made close passes near, or provide details about those encounters. Those points should not be inferred from the picture alone.
The Next APOD Entry
NASA’s page points readers to the next Astronomy Picture of the Day, titled “Stairway to Heaven.” The Oct. 12 entry does not provide further information about that forthcoming image or announce a new observing campaign tied to this alignment. For now, the published explanation and credit identify the image’s setting, its sequence of exposures and the five moons visible in the composition.
Key Questions
Which five moons appear in the image?
They are Earth’s Moon and Jupiter’s four Galilean satellites: Ganymede, Io, Callisto and Europa. NASA lists the Jupiter moons from bottom to top in that order.
What does it mean that the Moon passed in front of Jupiter?
From the photographer’s viewpoint in Westchester, New York, Earth’s Moon appeared to cross Jupiter’s position in the sky. This is an apparent alignment from Earth, not a claim that the objects were physically close together.
What is earthshine?
Earthshine is sunlight reflected from Earth that faintly illuminates the night side of the Moon. NASA identifies it as the dim light visible on the upper-right portion of the lunar disk.
Was the picture made in one exposure?
No. NASA describes it as a series of exposures taken near the alignment. The entry does not provide technical details about how those exposures were combined.
What does NASA say about Juno?
NASA says the Juno spacecraft is currently orbiting Jupiter and has made close passes near three of the four moons. The Oct. 12 entry does not name the three moons or describe those encounters further.
Source: primary
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