A fresh perspective of Jupiter’s irregularly shaped satellite, Thebe, has been obtained by NASA’s Juno probe following a close encounter on May 1st. This flyby, conducted from a proximity of merely 5,000 kilometers, has illuminated the extensively scarred celestial body.
Juno captured this view of Thebe during a close flyby on May 1, 2026. Image credit: NASA / JPL-Caltech.
Thebe is characterized by its diminutive size and irregular form, measuring approximately 116 by 98 by 84 kilometers in its dimensions, with an average radius around 49 kilometers.
Within Jupiter’s satellite family, it ranks as the second-largest among the inner moons and holds the seventh position for size across the entire Jovian system.
The initial detection of Thebe occurred in 1979, credited to astronomer Stephen Synnott, who analyzed imagery acquired by NASA’s Voyager 1 spacecraft.
This moon maintains an average orbital distance of approximately 221,900 kilometers from Jupiter, situated considerably within the orbital path of Io, which is Jupiter’s innermost Galilean satellite. The completion of a single orbital revolution around Jupiter necessitates roughly 16.1 hours.
Consistent with many of Jupiter’s inner moons, Thebe exhibits synchronous rotation, a phenomenon where one hemisphere perpetually faces the gas giant.
The surface of Thebe is marked by a profusion of impact craters and possesses a dark, reddish hue. Its most distinguished geological feature is the substantial impact basin known as Zethus, named in homage to Thebe’s mythological fraternal twin.
A significant contribution attributed to Thebe is its role as the principal progenitor of material for Jupiter’s gossamer ring, one of the less luminous outer components of the planet’s ring structure. The constant bombardment by micrometeorites ejects particulate matter from the moon’s surface, which then disperses to form a faint, diffuse ring aligned with Thebe’s orbital trajectory.
“Thebe is situated at the periphery of Jupiter’s subtle ring system and is thought to contribute to the genesis of the planet’s ‘gossamer’ ring through the expulsion of dust,” stated NASA researchers in an official declaration.
The recent photographic rendering of Thebe was acquired by the Stellar Reference Unit (SRU), an instrument aboard the Juno spacecraft, from an altitude of close to 5,000 kilometers.
“Although the SRU’s principal purpose involves imaging star fields for navigational accuracy, its exceptional sensitivity under low-light conditions renders it a potent auxiliary scientific instrument,” commented the research team.
“Previously, the SRU has been instrumental in identifying phenomena such as ‘shallow lightning’ within Jupiter’s atmosphere and in capturing images of the planet’s ring system.”
