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NASA’s Astronomy Picture of the Day for Oct. 12, 2026, features a sequence of exposures showing Earth’s Moon and four of Jupiter’s bright moons during a close apparent alignment last week. The image was taken from Westchester, New York; NASA says the four satellites, from bottom to top, are Ganymede, Io, Callisto and Europa.
NASA’s Astronomy Picture of the Day for Oct. 12, 2026, features a series of exposures showing Earth’s Moon alongside Jupiter and four of its bright moons, after the Moon passed directly in front of Jupiter as seen from Earth last week. The image was taken from Westchester, New York, and brings together five natural satellites in one composition.
The NASA explanation says the best answer to how many moons appear in the picture is five: Earth’s Moon, also called Luna, and Jupiter’s four bright Galilean satellites. The image is not presented as a single exposure; it is a series of exposures near the alignment. NASA does not provide exposure times or technical details about how the images were combined.
In the pictured arrangement, Earth’s Moon sits at lower left. Its sunlit crescent is overexposed, while the upper-right portion of its night side is faintly lit by earthshine—sunlight reflected from Earth onto the Moon. Above it, the Jupiter moons appear in a nearly vertical line. NASA identifies them from bottom to top as Ganymede, Io, Callisto and Europa.
The Astronomy Picture of the Day entry is dated Oct. 12, 2026. It credits the image to Chirag Upreti and names Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti and Keighley Rockcliffe as authors and editors. NASA says the APOD service is associated with the Astrophysics Science Division at Goddard Space Flight Center, NASA Science Activation and Michigan Technological University.
Five Moons in One Alignment
The image makes an uncommon-looking arrangement easy to grasp: Earth’s Moon and four moons of Jupiter appear together in a view recorded from one location on Earth. The event behind it was an apparent alignment along the line of sight, as Earth’s Moon moved in front of Jupiter from the photographer’s perspective. The image does not mean the bodies were physically close to one another; they are at very different distances.
NASA’s caption also gives readers a practical comparison of their sizes. Ganymede, Callisto and Io are larger than Earth’s Moon, while Europa is described as only slightly smaller. That comparison can be surprising when the distant Jupiter satellites appear as points of light beside the much nearer Moon. Their apparent size and brightness in the image depend on distance, exposure and viewing conditions, not just their actual dimensions.
The photograph also records two kinds of illumination on Earth’s Moon. The bright crescent is sunlit, while earthshine faintly reveals the night side. This detail helps explain why the lunar disk can remain visible beyond its illuminated crescent, even though the image’s bright portion is overexposed.
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The Galilean Moons in View
Jupiter’s four bright satellites are known as the Galilean moons, a group commonly identified as Io, Europa, Ganymede and Callisto. NASA’s caption uses the order in which they appear in this particular image—Ganymede, Io, Callisto and Europa from bottom to top—rather than presenting them as a list by name alone. Their alignment in the photograph is a perspective effect: the moons orbit Jupiter, but in this view they appear nearly vertical above Earth’s Moon.
The picture follows a passage in which Earth’s Moon crossed directly in front of Jupiter in the sky from the viewpoint of the photographer. NASA says the featured image was assembled from exposures taken near that alignment in Westchester. The source does not specify the precise date, observing time, telescope or camera used, so those details cannot be confirmed from the APOD caption.
NASA also notes that its robotic spacecraft Juno is currently orbiting Jupiter and has made close passes near three of the four moons shown. The caption does not identify which three or describe particular flybys. That reference places the image alongside ongoing robotic study of the Jovian system, but the APOD item itself is an image feature, not a new mission finding.
Details the Caption Leaves Open
The APOD entry confirms the image’s location, date, credit and broad method, but it does not give the exact date or time of the lunar passage, the equipment used, the exposure sequence or processing details. It also does not state the angular separation between the objects or the observing conditions. The source describes a series of exposures near alignment, so readers should not assume the displayed brightnesses reproduce what the eye would have seen at one instant.
NASA’s caption says Juno has made close passes near three of the four moons, but it does not identify those moons or provide dates and measurements. The entry does not report a new scientific result from Juno; its focus is the astronomical image and explanation. No additional mission update or finding is included in the supplied material.
The Next APOD Entry
The immediate next item identified on the APOD page is the following day’s picture, titled “Stairway to Heaven.” The Oct. 12 feature does not announce a new observing campaign, mission decision or follow-up analysis, so no further development related to this image is specified in the source.
Readers seeking more technical information about the photograph would need details beyond the published caption, such as the exposure settings and the exact observing time. NASA’s entry supplies the core identifications and visual explanation, but does not say whether those additional image details will be published.
Key Questions
What does the October 12 APOD image show?
It shows Earth’s Moon and four of Jupiter’s bright moons in a series of exposures taken near an apparent alignment last week.
Which Jupiter moons appear, and in what order?
NASA identifies them from bottom to top as Ganymede, Io, Callisto and Europa.
Where was the image taken?
The APOD caption says the exposures were taken from Westchester, New York, USA.
Why is part of Earth’s Moon visible beyond the bright crescent?
NASA says the Moon’s night side is faintly illuminated by earthshine, sunlight reflected from Earth. The crescent itself is described as overexposed.
Does the image report a new discovery from Juno?
No new Juno finding is reported in the APOD entry. It notes that Juno is orbiting Jupiter and has made close passes near three of the moons, without naming them or giving new mission results.
Source: primary
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