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NASA’s Astronomy Picture of the Day for Oct. 12, 2026, features a series of exposures made near an alignment of Jupiter and Earth’s Moon, photographed from Westchester, New York. The image shows Jupiter’s four bright Galilean satellites above Earth’s Moon; the Moon’s night side is faintly lit by earthshine.
The image combines multiple exposures taken near the alignment, according to the explanation published with the NASA feature. Earth’s Moon appears at the lower left: its sunlit crescent is overexposed, while the night side is faintly visible through earthshine, sunlight reflected from Earth onto the lunar surface.
Above Earth’s Moon, the four visible Galilean satellites appear in a near-vertical line. From bottom to top, the NASA caption identifies them as Ganymede, Io, Callisto and Europa. The arrangement shows Jupiter’s moons in the same field of view as Earth’s Moon, though the photograph is a series of exposures rather than a single unaltered snapshot.
The APOD explanation notes that Ganymede, Io and Callisto are larger than Earth’s Moon, while Europa is slightly smaller. It also says NASA’s Juno spacecraft is orbiting Jupiter and has made close passes near three of these four moons. The feature credits the image to Chirag Upreti.
The photograph brings together five natural satellites that are usually viewed in different parts of the sky: Earth’s Moon and Jupiter’s four prominent Galilean moons. Their apparent alignment makes the scale and variety of Jupiter’s moon system easier to compare with the familiar lunar disk.
The scene is an observational image, not a new finding about the moons or their physical arrangement in space. Their near-vertical appearance reflects line of sight from Earth at that time. The image nevertheless offers a useful visual record of a short-lived viewing opportunity, paired with details about ongoing robotic exploration at Jupiter.
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How the Alignment Was Captured
NASA’s Astronomy Picture of the Day presents a daily image or photograph of the universe with an explanation written by a professional astronomer. For the October 12 entry, NASA says the source images were exposures made in Westchester, New York, near the moment Earth’s Moon passed directly in front of Jupiter in the sky last week.
The caption’s phrase “How many moons can you see?” refers to the five shown in the composition: the four Galilean satellites and Luna, Earth’s Moon. Jupiter’s satellites are named for the large moons Galileo observed in 1610. NASA’s Juno mission, cited in the APOD text, continues to study Jupiter and has passed close to three of the moons; the page does not specify which three in this entry.
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Limits of the Published Image
The NASA page describes a series of exposures but does not give their exact timestamps, exposure settings or the length of the observing sequence. It also does not state the precise date of last week’s alignment, or identify which three Galilean moons Juno has passed near.
The image records how the objects appeared from one location on Earth; their apparent line does not mean the moons were physically arranged in a straight line near Earth. The APOD entry does not provide further measurements or claim a new scientific result from the observation.
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Juno Continues Its Jupiter Mission
NASA says Juno is currently orbiting Jupiter and has made close passes near three of the four moons named in the image. The APOD entry does not announce a new maneuver, observation date or mission milestone, so no specific next close pass is established by this report.
The next item listed by APOD is another daily image, titled “Stairway to Heaven,” scheduled for October 13. The Jupiter-and-moons photograph remains a record of last week’s alignment as presented in NASA’s October 12 feature.
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Key Questions
How many moons are shown in NASA’s APOD image?
The image shows five moons: Earth’s Moon and Jupiter’s four Galilean satellites, Ganymede, Io, Callisto and Europa.
Where was the photograph taken?
The NASA explanation says the exposures were taken from Westchester, New York, USA.
Why does the Moon’s dark side appear faintly lit?
The caption attributes the faint light on the lunar night side to earthshine, sunlight reflected from Earth.
Were the five moons physically lined up in space?
The image shows them in a near-vertical line from Earth’s viewpoint. The NASA page describes an apparent alignment and does not say the moons were physically arranged in a straight line.
What does NASA say about Juno?
The APOD explanation says Juno is orbiting Jupiter and has made close passes near three of the four moons. It does not name those three in the entry.
Source: primary
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